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1. 3 Specifications and Environmental Conditions Specifications 3 1 3 2 Specifications and Environmental Conditions Specifications Operating Range 100 C to 110 C 148 F to 230 F Set point Accuracy 1 C Stability 0 003 C at 100 C methanol Uniformity 0 005 C at 100 C methanol Tank Capacity 4 8 gal 18 liters Work area 3 8 dia x 16 D 98 mm x 406 mm Cooling capacity nominal 50 watts at 100 C 600 watts at 0 C Refrigeration 2 x1Hp Heater size 350 and 700 watts 240V Electric Power 230 VAC 10 60 Hz 15 amps single phase 50 Hz optional Exterior Dimensions 50 H x 32 W x 19 D 127 x 81 3 x 48 3 cm Shipping Weight 400 lbs 182 kg Temperature Drift per C Ambient or 10 volts AC line 0 5m C Safety OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions e temperature range 5 50 C 41 122 F e ambient relative humidity maximum 8046 for temperature 31 C de creasing linear
2. Hart Scientific 9 7100 Calibration Bath User s Guide Rev 542801 Limited Warranty amp Limitation of Liability Each product from Fluke Corporation s Hart Scientific Division Hart is warranted to be free from de fects in material and workmanship under normal use and service The warranty period is one year for the Calibration Bath The warranty period begins on the date of the shipment Parts product repairs and ser vices are warranted for 90 days The warranty extends only to the original buyer or end user customer of a Hart authorized reseller and does not apply to fuses disposable batteries or to any other product which in Hart s opinion has been misused altered neglected or damaged by accident or abnormal conditions of operation or handling Hart warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Hart does not warrant that software will be error free or operate without interruption Hart does not warrant calibrations on the Calibration Bath Hart authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Hart Warranty support is available if product is purchased through a Hart authorized sales outlet or Buyer has paid the applicable international price Hart reserves the right
3. SET Store new set point access vernier 0 00000 Current vernier value 13 7100 Calibration Bath User s Guide 14 The bath heats or cools until it reaches the new set point temperature Set the heater switch to position HIGH to allow the bath to more quickly reach a higher temperature The HIGH setting may be necessary to reach and control at some temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cut out should be correctly set for added safety See Section 9 8 If operating the bath below 45 C set the COOLING power switch to ON The cooling temperature or cooling power may require adjustment to provide the proper amount of cooling See Section 8 5 To obtain optimum control stability adjust the proportional band as discussed in Section 9 7 5 Installation Bath Environment 5 5 1 5 2 A A Installation CAUTION READ SECTION6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the war ranty This bath is not designed to be portable Therefore moving the bath once it has been installed should be kept to a minimum WARNING Never move a bath that is full of fluid This action could be extremely dangerous and could result in personal injury to the person moving the bath The bath is equipped with casters and should be rolled It is not designed to be l
4. If the cut out is still in the over temperature fault condition the display continues to flash cut out The bath temperature must drop a few degrees below the cut out set point be fore the cut out can be reset Temperature Set point The bath temperature can be set to any value within the range and with resolu tion as given in the specifications The temperature range of the particular fluid used in the bath must be known by the operator and the bath should only be op erated well below the upper temperature limit of the liquid In addition the cut out temperature should also be set below the upper limit of the fluid Setting the bath temperature involves three steps 1 select the set point mem ory 2 adjust the set point value and 3 adjust the vernier if desired Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the bath to a previously programmed tem perature set point To set the bath temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set point memory currently being used is shown at the left on the display followed by the current set point value 25 00 Bath temperature in degrees Celsius 39 7100 Calibration Bath User s Guide 40 9 3 2 9 3 3 Press SET to accept the new selection and access t
5. QUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT TORT RELIANCE OR ANY OTHER THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court of com petent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive e American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice Copyright O 2005 Printed in USA Table of Contents 1 Before You Start 1 1 Symbols Used s i se o a o e e Rn 1 1 2 Safety Information o ss so eR Ro RR RE 2 1 2 1 WET SS CP rnm 2 1 22 CAUTIONS dia sek da id o deter CENE E aia up seeds the E a cae ds en 4 1 3 Authorized Service Centers ll 5 2 Introduction 7 3 Specifications and Environmental Conditions 9 3 1 Specifications com a eee Reg Re X P E RUE E eS 9 3 2 Environmental Conditions cles 9 4 Quick SEP aaa x y ACRES a a E 4 1 Unpacking over Eoo Rx EXE
6. SEr AL Finally press SET to enter the serial parameter menu In the serial interface parameters menu are the BAUD rate the sample rate the duplex mode and the linefeed parameter 10 1 2 1 Baud Rate The baud rate is the first parameter in the menu The display will prompt with the baud rate parameter by showing Bf Ud Press SET to choose to set the baud rate The current baud rate value will then be displayed The baud rate of the 1502 serial communications may be programmed to 300 600 1200 or 2400 baud The baud rate is pre programmed to 1200 baud Use UP or DOWN to change the baud rate value Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu 10 1 2 2 Sample Period 52 The sample period is the next parameter in the menu and prompted with 58f PLE The sample period is the time period in seconds between temperature 10 Digital Communication Interface IEEE 488 Communication optional 10 1 2 3 10 1 2 4 10 1 3 10 2 10 2 1 measurements transmitted from the serial interface If the sample rate is set to 5 the bath transmits the current measurement over the serial interface approxi mately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Adjust the period with UP or DOWN and then use SET to set the sample rate to the
7. see Sec tion 1 3 on page 5 for assistance 13 Troubleshooting Troubleshooting Problem Causes and Solutions The controller shows that the out put power is steady but the pro cess temperature is unstable Possible causes are an improper proportional band setting or the fluid being used e f the bath temperature does not achieve the expected degree of stability when measured using a thermometer try adjusting the proportional band to a narrower width as discussed in Section 9 7 Proportional Band Check to ensure the fluid has not deteriorated or is not too thick The controller alternately heats for a while then cools The bath is not stable and the duty cycle is not constant The proportional band being too narrow typically causes this oscillation Increase the width of the proportional band until the temperature stabilizes as discussed in Section 9 7 Proportional Band The controller erratically heats then cools control is unstable If both the bath temperature and output power do not vary periodically but in a very erratic manner the problem may be excess noise in the system Noise due to the control sensor should be less than 0 001 C However if the probe has been damaged or has developed an inter mittent short erratic behavior may exist The probe is located inside the stirrer motor cover Check for a damaged probe or poor connection between the probe and bath Check the resistan
8. 5 water by volume or approximately 93 methanol and 7 wa ter by weight Methanol if incorrectly mixed or not mixed at all with water will cause the following prob lems f no water is mixed with methanol the methanol will freeze on the cooling coil as seen in Figure 12 and the bath usually will not cool much below 97 C ftoo much water is mixed with methanol or has been absorbed by the fluid through normal use the fluid will be thicker and become cloudy while stirring This can cause either instability of the bath or prevent the bath from cooling the fluid to 100 C e f the methanol water mixture appears to be the prob lem contact an Authorized Service Center see Section 1 3 on page 5 for assistance Power Up The unit is equipped with internal operator accessible fuses If a fuse blows it may be due to a power surge or failure of a component Re place the fuse once DO NOT replace the fuse with one of a higher current rating Always replace the fuse with one of the same rating voltage and type If the fuse blows a second time it is likely caused by failure of a component or part Contact an Authorized Service Cen ter See Section 1 3 for assistance 13 Troubleshooting Troubleshooting Problem Causes and Solutions The controller does not maintain Note Before performing the memory check you need to record the controller parameters or parame controller calibration parameters found in the CAL
9. Band Fluid Temperature Heater Setting Stability Methanol 100 C Low 0 04 C 0 005 C Methanol 80 C Low 0 04 C 0 005 C Methanol 40 C Low 0 04 C 0 003 C Water 0 0 C Low 0 04 C 0 003 C Water 30 0 C Low 0 04 C 0 003 C Water 60 0 C Low 0 04 C 0 003 C Eth Gly 50 35 0 C Low 0 05 C 0 003 C Eth Gly 50 60 0 C Low 0 05 C 0 003 C Oil 35 0 C Low 0 1 C 0 003 C Oil 60 0 C Low 0 2 C 0 003 C Oil 100 C Low 0 2 C 0 005 C 44 9 Controller Operation Cut out 9 8 To accept the new setting and access the cut out set point press SET Press ing EXIT exits the secondary menu ignoring any changes just made to the proportional band value SET Accept the new proportional band setting Cut out As a protection against software or hardware fault shorted heater triac or user error the bath is equipped with an adjustable heater cut out device that shuts off power to the heater if the bath temperature exceeds a set value This protects the heater and bath materials from excessive temperatures and most impor tantly protects the bath fluids from being heated beyond the safe operating temperature preventing hazardous vaporization breakdown or ignition of the liquid The cut out temperature is programmable by the operator from the front panel of the controller It must always be set below the upper temperature limit of the fluid and no more than 10 degrees above the upper temperature limit of
10. Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On OPPOUPH 7100 Calibration Bath User s Guide Symbol Description CAT II G Canadian Standards Association us OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark C TIC Australian EMC Mark 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the terms Warning and Caution Warning identifies conditions and actions that may pose hazards to the user Caution identifies conditions and actions that may damage the instru ment being used 1 2 1 A Warnings To avoid personal injury follow these guidelines GENERAL DO NOT use the instrument for any application other than calibration work The instrument was designed for temperature calibration Any other use of the instrument may cause unknown hazards to the user DO NOT use the instrument in environments other than those listed in the user s guid
11. RO es Be 40 Temperature Scale Units piegas 41 secondary Menu ui o pow e be EG E Xe vos 42 Heater POWEL ss us aed gei udo pee SER PE EPIS 42 Proportional Band ee ee ee 42 CUt OUt 2 684s bee eee ek Oa Ge dae ed oe eds 45 Controller Configuration ll 46 9 10 Probe Parameters e 46 9 10 1 l ge dee as he eS ae he hse ae eed Se hear es ea ee ere ee 8 46 9 10 2 ALPHA c ase sks Joes Be lee Maca wed oar bbe Deedes a de AA oe 47 9 11 Operating Parameters lens 47 9 11 1 Cutout Reset MOOG soha a uo sc AO xe Ae ha ex GU Y XC 47 9 12 Serial Interface Parameters les 47 9 12 1 Baud Rates o y 2d dopo ono d oho de a 47 9 12 2 Sample Period san e gorii p xe BAER EG dAde ask wed 48 9 12 3 Duplex Moder suitte a Eee Wed Hels de ee o e ele ode 48 9 12 4 Liefegd suu os E 4 xw XCXC RO XCECK OW OES XX c3 ECKE X Wo o4 49 9 13 IEEE 88Parameters een 49 9 13 1 IBEE 488 Address 4 9 6b Sw ee ROO ORO ROO KORR E RO 49 9 14 Calibration Parameters leen 50 9 14 1 CIO Lu uaa ge A a x av seran dt ADAMS SE 50 9 14 2 BO wm BG i444 ada ada de de ad 50 9 14 3 EI SUE uos doi Ree AAA aO AAA AAA AO Y 50 10 Digital Communication Interface 51 10 1 Serial Communications e 51 10 1 1 WIDE usd eS a Dae mop dew X Glee E Aa 52 10 1 2 SEP 2 dba aw Micka dee qo deed d qoM P e Sen ond died da d 52 10 1 2 1 Baud Rates 2 iss as oou Ro Sm
12. Reb Rode OA ms lc e Eo RR 52 10 1 2 2 Sample Period s ule Re RR ex ob wae ep Ra ye AUR heut Wha ada n 52 101 23 Duplex Mode ico o mor eg sm RR ORO ee A cet Gh EDA gee eee 53 10 12 44 Eanefeed 2 chs E eet Soo dee d Me erae moe edo eds 53 10 1 3 Serial Operations i deta naa ede dud ewe Qe ha SO 53 10 2 JEEE 488 Communication optional 53 10 2 1 Sep ic ove wm E GR a aa A we a dE a ena 53 10 2 1 1 TEEE 488 Interface Address 2s oou wen RR s 54 10 2 2 IEBE 488 Operation uu xk nox ortum a massi ar eA 54 10 3 InterfaceCommands 020008 54 10 4 Power Control Functions lll 54 10 4 1 Heater Controle atras GR ete s dh Ret Ce tes 57 10 4 2 Cooling Control s er doo o qe dene dx dex dd dee dd de 57 11 Calibration Procedure 59 11 1 Calibration Points 2 2 e e 59 11 2 Measuring the Set point Error 2 2 2 0 0 00 59 11 3 Computing Rand ALPHA 0 0 59 11 4 Calibration Example se se eoc necese retina tets ti 60 12 Maintenance 63 13 Troubleshooting 65 13 1 Troublesho0ting e e eotie 65 lii Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Bath Assembly y Lene ds coo SEEKS A ee oe 7 Semi hermetic Compressor o e e 12 Front Panel 2 6 ese e
13. cooling the front panel controls are disabled by 1 switching the heater switch to LOW 2 switching the cooling switch to OFF switching the cooling power switch to HIGH and adjusting the cooling temperature pressure to 3 Hg or pressure required for minimum desired bath temperature Otherwise the interface would not be able to switch these functions off The 7100 bath has five control func 10 Digital Communication Interface Power Control Functions Table 4 Communication Commands Command Command Returned Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set point s etpoint S set 9999 99 C or F set 150 00 C Set current set point to n s etpoint n s 450 Instrument Range Read vernier v ernier V v 9 99999 v 0 00000 Set vernier to n v ernier n v 00001 Depends on Configuration Read temperature t emperature t t 9999 99 C or F t 55 69 C Read temperature units u nits u u X uc Set temperature units u nits c f CorF Set temperature units to Celsius u nits c u C Set temperature units to u nits f u f Fahrenheit Secondary Menu Read proportional band setting pr op band pr pr 999 9 pr 15 9 Set proportional band to n pr op band n pr 8 83 Depends on Configuration Read cutout setting c utout C c 9999 x xxx c 620 C in Set cutout setting c u
14. in the secondary menu is the heater power display Heater Power The temperature controller controls the temperature of the bath by pulsing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time This value may be estimated by watching the red green control indicator light or read di rectly from the digital display By knowing the amount of heating the user can tell if the bath is heating up to the set point cooling down or controlling at a constant temperature Monitoring the percent heater power lets the user know how stable the bath temperature is With good control stability the percent heat ing power should not fluctuate more than 1 within one minute The heater power display is accessed in the secondary menu Press SET and EXIT simultaneously and release The heater power will be displayed as a percentage of full power Access heater power in secondary menu le Pet Heater power in percent To exit out of the secondary menu press EXIT To continue on to the propor tional band setting function press SET Return to temperature display Proportional Band In a proportional controller such as this the heater output power is proportional to the bath temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bot 9 Controller Operation
15. mature failure of the compressor This bath has been equipped with a brownout and over voltage protection device as a safety feature to protect the system components Mode of Operation This bath needs to be plugged into the line voltage for at least 2 minutes before operation This is only necessary for the first time the bath is energized or when it is moved from one location to an other Turning the bath ON or OFF does not trigger the delay If a High Low voltage condition exists for longer than 5 seconds the bath de energizes An amber indicator on the back panel lights when this con dition exists Re energization is automatic upon correction of the fault condition and af ter a delay cycle of about 2 minutes If a fault condition exists upon appli cation of power the bath will not energize Under and Over Voltage Protection at 230 VAC Voltage Cutout 12 5 203 257 VAC Voltage Cut In 7 5 213 247 VAC Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS 7100 Calibration Bath User s Guide Phone 31 402 675300 Telefax 31 402 67
16. menu of the instru ters are reset each time the ment and any user adjusted parameters that you have changed power to the unit is removed such as the programmable set points and proportional band Memory Check Doing a memory check is the easiest way to verify the ability of the battery to maintain controller parameters 1 Power off the instrument 2 Disconnect the instrument from AC power for 10 seconds 3 Reconnect the AC power and power on the instrument 4 If the display shows InIT and or the cycle count shows a low num ber such as 0002 the battery is spent and should be replaced Con tact an Authorized Service Center for assistance 5 After replacing the battery you must reprogram the calibration and user adjustable parameters into the controller Figure 12 Ice buildup on cooling coils 71
17. nier setting has immediate effect as the vernier is adjusted SET need not be pressed This allows one to continually adjust the bath temperature with the vernier as it is displayed Increment display 9 Controller Operation Temperature Scale Units 9 4 New vernier setting Next press EXIT to return to the temperature display or SET to access the temperature scale units selection SET Access scale units Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius C or Fahrenheit F These units are used in displaying the bath temperature set point vernier proportional band and cut out set point The temperature scale units selection is accessed after the vernier adjustment function by pressing SET From the temperature display function access the units selection by pressing SET 4 times 25 00 C Bath temperature l 25 0 Press UP or DOWN to change the units Change units 41 7100 Calibration Bath User s Guide 42 9 5 9 6 9 7 New units selected Press SET to accept the new selection and resume displaying the bath temperature Set the new units and resume temperature display Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simulta neously and then releasing The first function
18. personnel fail to observe the safety precautions Before working inside the equipment turn off the power and disconnect the power cord 7100 Calibration Bath User s Guide BATH FLUIDS Fluids used in this bath may produce noxious or toxic fumes under certain circumstances Consult the fluid manufacturer s MSDS Material Safety Data Sheet Proper ventilation and safety precautions must be observed The instrument is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check the flash point boiling point or other fluid characteristic applicable to the circumstances of the bath oper ation Ensure that the soft cutout is adjusted to the fluid characteristics of the application As a guideline the soft cutout should be set 10 C to 15 C below the flash point of the bath fluid See Section 8 1 Heat Transfer Fluid for specific information on bath fluids and Section 9 2 Cutout 1 2 2 A Cautions To avoid possible damage to the instrument follow these guidelines Always operate this instrument at room temperature between 41 F and 122 F 5 C to 50 C Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument When filling the tank ensure the immersion coils are completely covered DO NOT overfill the bath Overflowing fluid may damage the electrical system See Section 5 3 Bath Preparation and Filling for specific instruc tions Read Sectio
19. to stablize after each adjust ment For best bath stability the cooling should be adjusted to allow the heater power to operate between 10 and 50 For temperatures above 60 C set to approximately 90 psig and regulate the cooling power with the cooling power switch For maximum cooling for ramping down and controlling at lower temperatures the cooling power should be switched to HIGH and the cooling pressure should be set to 2 Hg Readjust higher or lower as required after the set point temperature is reached Temperature Controller The bath temperature is controlled by Hart Scientific s unique hybrid digi tal analog temperature controller The controller offers the tight control stability of an analog temperature controller as well as the flexibility and programmabil ity of a digital controller The bath temperature is monitored with a platinum resistance sensor in the con trol probe The signal is electronically compared with the programmable refer ence signal amplified and then fed to a pulse width modulator circuit which controls the amount of power applied to the bath heater The bath is operable within the temperature range given in the specifications For protection against solid state relay failure or other circuit failure the microcontroller automatically turns off the heater with a second mechanical re lay anytime the bath temperature is more than a certain amount above the set point temperature As a second pro
20. 3 135 C 0 45 100 C 50 150 C 0 482 200 C Silicone Oil Type 10 C v 230 C fl cc 232 C 20 25 C 0 949 25 C 0 370 40 C 0 00034 25 C 0 00107 1000 25 C 200 20 5013 0 393 100 C 50 150 C 0 420 200 C Silicone Oil Type 30 C v 278 C fl cc 280 C 50 25 C 0 96 25 C 0 4 0 00037 25 C 0 00104 1000 25 C 200 50 5014 50 150 C Silicone Oil Type 70 C v 230 C fl cc 232 C 50 70 C 1 07 25 C 0 358 40 C 0 00035 25 C 0 00075 100 25 C 550 5016 300 C fl oc 10 104 C 0 386 100 C 1 150 C 0 433 200 C Silicone Oil Type 80 C v 300 C fl oc 302 C 500 80 C 1 11 25 C 0 363 40 C 0 00035 25 C 0 00077 100 25 C 710 5017 7 204 C 0 454 100 C 1 150 C 0 505 200 C Silicone Oil Type 66 C v 313 C fl oc 315 C 50 66 C 0 96 25 C 0 34 100 C 0 0003 0 00095 100 25 C 210 H 14 204 C 1 150 C Heat Transfer Salt 180 C fr 550 C NONE 34 150 C 2 0 150 C 0 33 0 0014 0 00041 1 7 Q fcm 5001 6 5 300 C 1 9 300 C 2 4 500 C 1 7 500 C Limiting Factors b boiling point e high evaporation fl flash point fr freeze point v viscosity Flash point test oc open cup cc closed cup Very low water solubility ice will form as a slush from condensation below freezing 32 Flash Point The point at which ignition may occur See flash point discussion in Section8 1 8 The point shown may be either the ope
21. 5321 E mail ServiceDesk G fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 403 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antngOsinga fluke com When contacting these Service Centers for support please have the following information available e Model Number e Serial Number e Voltage e Complete description of the problem 2 Introduction Introduction The Hart Scientific 7100 is a very precise constant temperature bath The bath is specially designed for low temperature applications An innovative state of the art solid state temperature controller has been incorporated which maintains the bath temperature with extreme stability The controller uses a microproces sor to execute the many operating functions User interface is provided by the 8 digit LED display and four key switches Digital remote communications is optionally available with a RS 232 or IEEE 488 interface The tank for the 7100 is stainless steel and holds 18 liters The refrigeration system is a unique two stage cascade design featuring CFC Free refrigerants w w Figure 1 Bath Assembly
22. ESSA 11 4 2 Semi Hermetic Compressor clle 11 4 3 Set Up 44 done b wer es eon e S ced 11 4 44 POW is oo eee om aro o9 Pee se bade betes 12 4 5 Setting the Temperature o 13 5 Installation 5 5259933 99993 ocv AS 5 1 BathEnvironment ea s a sied 2e 15 5 2 Dry out Peri d sos iio fod sa E E OR C E RN s 15 5 3 Bath Preparation and Filling 16 5 4 lus M as e a REET ORES E 16 5 3 POWER Sapa os es e eer are amp Ee 16 6 Bath USe 4 5 52 4 cse terete e Botte he dete rs we AY 6 1 General ula RR we eR a bb kee d Rm UR a 19 6 2 Comparison Calibration 19 6 3 Calibration of Multiple Probes lesen 20 7 Parts and Controls 4 lt 644 644 ce x xo ox woe 21 7 1 Front Control Panel sa s a a nan Se RS 21 7 2 Refrigeration Controls o e 22 ii 7 3 7 4 7 5 Back Panel 4 2 oua o aio aed cR ae Ke BS 23 Lidia oS sio cb 04 4 ded xd 25 Fluid Level Adapter p c s e wih eh eek omm mop io 26 8 GeneralOperation 27 8 1 8 2 8 3 8 4 8 5 8 6 Bath Heat Transfer Fluid gos 3 ee ge Ro a a 2T 8 1 1 Temperature Range s ove cede une a RE a E 27 8 1 2 MISCOSILY 5 S ced ior p P eut UE TS RR P EUR UE tec oye he cR eus 27 8 1 3 Specific Heat lt i P TEILT 27 8 1 4 Thermal Conductivity 2 649 63 Sa Lae bx ERS Es 28 8 1 5 Thermal Expansion axo bof ha wo ke Bee BES dedo om Ro A 28 8 1 6 Electrical Resi
23. G ee oo e a RS mA 21 Back Panel sd kdo x euessk xo Na Be G ae SRE RD 24 Standard Lid Top View leen 25 Fluid Level Adapter gt ss 2 22 cc om x 26 Chart of Various Bath Fluids o 33 Controller Operation Flowchart o ee ses esae oceana aa 38 Bath temperature fluctuations at various proportional band settings 43 Serial CableWinng so e saaie yo owe wade ee e qo 52 Sample calibration computations leen 61 Ice buildup on cooling coils llle 71 Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 International Electrical Symbols s 1 Table of Bath Fluids and Their Characteristics 32 Proportional Band Fluid Table ln 44 Communication Commands llle 55 Communication Commands continued ln 56 Communication Commands continued o Serial power control functions less 58 Recommended settings for general operation 58 1 Before You Start Symbols Used 1 1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description No AC Alternating Current PS AC DC Battery CE Complies with European Union Directives Mm MA DC Double Insulated Electric Shock
24. Proportional Band tom of the proportional band the heater output is 10096 At the top of the pro portional band the heater output is 0 Thus as the bath temperature rises the heater power is reduced which consequently tends to lower the temperature back down In this way the temperature is maintained at a fairly constant temperature The temperature stability of the bath depends on the width of the proportional band See Figure 9 If the band is too wide the bath temperature will deviate ex cessively from the set point due to varying external conditions This is because the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system If the propor tional band is too narrow the bath temperature may swing back and forth be cause the controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width wS Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band Lol Figure 9 Bath temperature fluctuations at various proportional band settings The optimum proportional band width depends on several factors among which are fluid volume fluid characteristics viscosity specific heat thermal conduc tivity heater power setting operating temperature and stirring Thus the pro portional band width may require adjustment for best bath stability when any of these condit
25. Y AA AA RARA lt EXIT Display Power i Y a EXIT Reset Cutout I SET j l Y f SET l Cutout Active l EXIT Set Proportional Band A o eee a a I Y SET e EXIT Select Setpoint Y SET lt EXIT HH Set Gai Temp Y SET c Er Adjust Setpoint I SET y T Adjust Vernier IT I SET y le EXIT Set Scale C F Configuration Menu I JET UE A SET I LY A EXIT EXIT EXIT IEEE 488 Interface DOWN Calibration E SET Y Device r i i i i i i i i i i j i i i Address j i j i l j l i i j i j i i j i l i i i j SET EXIT Adj Device Address I SET EXIT IEEE 488 Option Installed SET x5 8 UNO I SET EXIT z Ss Ur SET EXIT Un E DO NOT CHANGE THESE VALUES SEE MANUAL I SET EXIT a sH E E SET EXIT qus SET g gt tt SET EXIT 9 Controller Operation Temperature Set point 9 3 9 3 1 Cut out reset function Press SET once more to reset the cut out SET Reset cut out The display is also switched to the set temperature function To return to dis playing the temperature press the EXIT button
26. and ALPHA are 100 000 and 0 0038500 respectively The calibra tion points are chosen to be 30 00 and 80 00 C The measured bath temperatures are 29 843 and 79 914 C respectively Refer to Figure 11 for ap plying equations to the example data and computing the new probe constants 11 Calibration Procedure Calibration Example R 100 000 ALPHA 0 0038500 tj 30 00 C measured t 29 843 C ty 80 00 C measured t 79 914 C Compute errors err 29 843 30 00 C 0 157 C erry 79 914 80 00 C 0 086 C Compute Ro pA nene R 80 0 30 0 Compute ALPHA 0 00385 1 00 000 100 077 1 0 00385 x 80 0 0 157 1 0 00385 x 30 0 0 086 i ALPHA l 80 0 30 0 Figure 11 Sample calibration computations l 0 00385 0 0038416 61 12 Maintenance 12 Maintenance The calibration instrument has been designed with the utmost care Ease of op eration and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments A battery is used to maintain operating parameters in the unit All operat ing parameters including calibration parameters should be checked on a regular basis to insure accuracy and proper operation of the instrument See the troubleshooting section for the procedure on checking the status
27. b water and will therefore form ice at tempera tures below 0 C Ice crystals turn the fluid into a slush which effectively in creases the viscosity and reduces temperature stability Pumping systems may be rendered ineffective due to ice blockage The ice water can be removed oc casionally by heating the fluid up to 100 C for brief periods of time Use halocarbon 0 8 under a fume hood at higher temperatures to remove vapors Toxicity is low but caution is always recommended Halocarbon 0 8 has excel lent electrical resistivity This fluid is fairly expensive Mineral Oil Mineral oil or paraffin oil is often used at moderate temperatures above the range of water Mineral oil is relatively inexpensive At lower temperatures mineral oil is quite viscous and control may be poor At higher temperatures vapor emission becomes significant The vapors may be dangerous and a fume hood should be used As with most oils mineral oil expands as temperature in creases so be careful not to fill the bath too full that it overflows when heated The viscosity and thermal characteristics of mineral oil is poorer than water so temperature stability will not be as good Mineral oil has very high electrical resistivity Use caution with mineral oil since it is flammable and may also cause serious injury if inhaled or ingested Silicone oil Silicone oils are available which offer a much wider operating temperature range than mineral oil Like most oils silicon
28. bath This improves the bath response time which allows it to maintain a more constant temperature For good control the viscosity should be less than 10 centistokes 50 centistokes is about the practi cal upper limit of allowable viscosity Viscosities greater than this cause very poor control stability because of poor stirring and may also overheat or damage the stirring motor With oils viscosity may vary greatly with temperature When using fluids with higher viscosities the controller proportional band may need to be increased to compensate for the reduced response time Otherwise the temperature may begin to oscillate Specific Heat Specific heat is the measure of the heat storage ability of the fluid Specific heat though to a lesser degree also affects the control stability and the heating and cooling rates Generally a lower specific heat means quicker heating and cooling Different specific heats may require an adjustment to the proportional band to compensate for the change in the sensitivity of the bath temperature to heat input 27 7100 Calibration Bath User s Guide 28 8 1 4 Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid Ther mal conductivity of the fluid affects the control stability temperature unifor mity and temperature settling time Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance Thermal Expansion Ther
29. before it can be assumed to meet all of the safety requirements of the IEC 1010 1 15 7100 Calibration Bath User s Guide 5 3 5 4 5 5 Bath Preparation and Filling The 7100 Bath is not provided with a fluid Various fluids are available from Hart Scientific and other sources Depending on the desired temperature range any of the following fluids as well as others may be used in the bath e Water e Ethylene Glycol Water e Methanol or Methanol Water mix e Halocarbon 0 8 e Mineral oil e Silicone oil Fluids are discussed in detail in Section 8 1 Remove any access hole cover from the bath and check the tank for foreign matter dirt remnant packing material etc Use clean unpolluted fluid Care fully fill the bath through the large square access hole to a level that will allow for stirring and thermal expansion The fluid should never exceed a height of 1 2 below the top of the tank Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing Remove excess fluid if nec essary and with caution if the fluid is hot Be careful to prevent bath fluid from spilling on the stirring motor while filling Note Underfilling may reduce bath performance and may possibly damage the bath heater Probe Inspect the bath controller probe This probe should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it con tains a precision platinum senso
30. by periodically switching the heater on for a certain amount of time using a solid state relay The front panel red green control indicator shows the state of the heater The control indicator glows red when the heater is on and glows green when the heater is off The indicator pulses constantly when the bath is maintaining a sta ble temperature The heater has two power level settings The HIGH heater power setting is used to quickly heat the bath fluid up to the desired operating temperature The HIGH heater power setting may also be required for control at high tempera tures The LOW setting is used for control at lower temperatures and for scanning at slower rates When controlling at the HIGH heater power setting instead of LOW the proportional band may need to be increased typically by a factor of four to compensate for the increase in power gain Otherwise the temperature may oscillate The heaters are protected against excess current due to short or failure by two 10 amp fuses The fuses are accessed at the back panel of the bath Cooling The Model 7100 refrigeration system is a 2 stage cascade system This means there are two individual refrigeration systems or stages The first stage cools down or provides cooling for the second stage The second stage cools the bath This type of system is required to attain very low temperatures The refrigera tion system runs continuously when cooling is required The first sta
31. ce between the probe pins and the sheath They should be open ntermittent shorts in the heater or controller electronic circuitry may also be a possible cause Contact an Au thorized Service Center see Section 1 3 on page 5 for assistance 69 7100 Calibration Bath User s Guide 70 Problem Causes and Solutions The bath does not achieve low temperatures Too much heating or not enough cooling can cause this problem Check that the control indicator glows green showing that the controller is attempting to cool The heaters may be disabled as a test by temporarily removing the heater fuses Insufficient cooling may be caused by lack of refrigerant due to a leak in the system Check the sight glass to verify the presence of liquid refrigerant It may be difficult to tell if the glass is completely full or completely empty Verify by watching the glass while the compressor is be ing turned on Maximize cooling by switching the cooling on setting the cooling power to high and setting the cooling pressure to 10 psi for temperatures above a pressure of 2 4 Hg is required to achieve 100 C Fluid can prevent the bath from achieving low temperatures e Halocarbon may become too thick to use below 95 C which will cause either instability of the bath or prevent the bath from cooling the fluid to 100 C The methanol water solution to be used to 100 C should be approximately 95 methanol and
32. characteristics Water has very low viscosity and good thermal conductivity and heat capacity which makes it among the best fluids for control stability at lower temperatures Temperature stability is much poorer at higher temperatures because water condenses on the lid cools and drips into the bath Water is safe and relatively inert The electrical conductivity of water may pre vent its use in some applications Water has a limited temperature range from a few degrees above 0 C to a few degrees below 100 C At higher temperatures evaporation becomes significant Water used in the bath should be distilled or deionized to prevent mineral deposits Consider using an algicide chemical in the water to prevent contamination Ethylene Glycol The temperature range of water may be extended by using a solution of 5096 water and 50 ethylene glycol antifreeze The characteristics of the ethylene glycol water solution are similar to water but with higher viscosity Use caution with ethylene glycol since the fluid is very toxic Ethylene glycol must be dis posed of properly Methanol Methanol is a relatively inexpensive fluid with a low temperature range Pure methanol has a temperature range from its freezing point of about 96 C to near its flash point at 54 C Vaporization is significant above 25 C so its use above this temperature is not recommended Methanol at low temperatures tends to condense and absorb water from the air This is genera
33. cing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe Calibration of Multiple Probes Fully loading the bath with probes increases the time required for the tempera ture to stabilize after inserting the probes Using the reference probe as the guide be sure that the temperature has stabilized before starting the calibration 7 Parts and Controls Front Control Panel 7 1 Parts and Controls Front Control Panel The following controls and indicators are present on the controller front panel see Figure 3 below 1 the digital LED display 2 the control buttons 3 the bath on off power switch 4 the control indicator light 5 the heater power switch and 6 the cooling power switch 1 The digital display is an important part of the temperature controller It displays the set point temperature and bath temperature as well as the various other bath functions settings and constants The display shows temperatures in values according to the selected scale units C or F 2 The control buttons SET DOWN UP and EXIT are used to set the bath temperature set point access and set other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows COOLING TEMPERATURE COOLING POWER EVAPORATING TEMPERATURE HIGH STAGE HIGH o CASCADE REFRIGERATION O Figure 3 Fr
34. d of f If of Calibration Menu Read BO calibration parameter bO b0 b0 9 b0 0 Set BO calibration parameter ton b0 n b0 0 999 9 to 999 9 Read BG calibration parameter bg bg bg 999 99 bg 156 25 Set BG calibration parameter ton bg n bg 156 25 999 9 to 999 9 Read low set point limit value tllow tl tl 999 tl 80 Set low set point limit to n tllow n tl 80 999 9 to 999 9 Read high set point limit value th igh th th 999 th 205 Set high set point limit to n th igh n th 205 999 9 to 999 9 Miscellaneous not on menus Read firmware version number ver sion ver ver 9999 9 99 ver 2100 3 56 Read structure of all commands h elp h list of commands Read Heater f f f1 9 f1 1 Set Heater f1 1 0 0or1 Set heater to low fl n f1 0 Set heater to high fi n f1 1 Read Refrigeration f2 f2 f2 9 f2 0 Set Refrigeration f2 1 0 0or1 Set Refrigeration to on f2 n f2 1 Set Refrigeration to off f2 n f2 0 Read Expansion Valve 1 13 13 13 9 13 1 Set Expansion Valve 1 f3 1 0 Oor1 Set Expansion Valve 1 to on f3 n f3 1 56 10 Digital Communication Interface Power Control Functions Table 6 Communication Commands continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set Expansion Valve 1 to off f3 n 13 0 Read Cooling Power f4 f4 14 9 14 1 Set Cooling Power f4 1 0 0or1 Set Cooling Power to low f4 n f4 1 Set Cooling Power to high f4 n f4 0 Read Expans
35. dis played value Duplex Mode The next parameter is the duplex mode indicated with d UPL The duplex mode may be set to half duplex HALF or full duplex FULL With full duplex any commands received by the bath via the serial interface are immedi ately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The default setting is full duplex The mode may be changed using UP or DOWN and pressing SET Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables On or disables OFF transmission of a linefeed charac ter LE ASCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed using UP or DOWN and pressing SET Serial Operation Once the cable has been attached and the interface set up properly the control ler immediately begins transmitting temperature readings at the programmed rate The set point and other commands may be sent to the bath via the serial interface to set the bath and view or program the various parameters The inter face commands are discussed in Section10 3 IEEE 488 Communication optional The IEEE 488 interface is available as an option Baths supplied with this op tion may be connected to a GPIB type communication bus which allows many instruments to be connected and controlled simultaneous
36. dvisable to wipe the probe with a clean soft cloth or paper towel before inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid salt carefully wash the probe in warm water and dry completely before transferring it to another fluid Always be sure that the probe is completely dry before in serting it into a hot fluid Some of the high temperature fluids react violently to water or other liquid mediums Be aware that cleaning the probe can be danger ous if the probe has not cooled to room temperature Additionally high temper ature fluids may ignite the paper towels if the probe has not been cooled For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature Comparison Calibration Comparison calibration involves testing a probe unit under test UUT against a reference probe After inserting the probes to be calibrated into the bath al low sufficient time for the probes to settle and the temperature of the bath to stabilize One of the significant dividends of using a bath rather than a dry well to cali brate multiple probes is that the probes do not need to be identical in construc tion The fluid in the bath allows different types of probes to be calibrated at 19 7100 Calibration Bath User s Guide 20 6 3 the same time However stem effect from different types of probes is not to
37. e DO NOT overfill the bath Overflowing extremely cold or hot fluid may be harmful to the operator See Section 5 3 Bath Preparation and Filling for specific instructions Follow all safety guidelines listed in the user s manual Calibration Equipment should only be used by Trained Personnel If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired Before initial use or after transport or after storage in humid or semi hu mid environments or anytime the instrument has not been energized for more than 10 days the instrument needs to be energized for a dry out 1 Before You Start Safety Information period of 2 hours before it can be assumed to meet all of the safety re quirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to apply ing power such as storage in a low humidity temperature chamber operat ing at 50 C for 4 hours or more e Overhead clearance is required Do not place the instrument under a cabi net or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes e The instrument is intended for indoor use only e The bath is a precision instrument Although it has been designed for op timum durability and trouble free operation it must be handled with care Position the bath before the tank is filled with fl
38. e STIRRER socket at the back of the bath Plug the heater power cord into the HEATER socket 17 6 Bath Use General 6 6 1 6 2 Bath Use A CAUTION READ THIS SECTION BEFORE PLACING THE BATH IN SERVICE The information in this section is for general information only It is not de signed to be the basis for calibration laboratory procedures Each laboratory will need to write their own specific procedures General Be sure to select the correct fluid for the temperature range of the calibration Bath fluids should be selected to operate safely with adequate thermal proper ties to meet the application requirements Also be aware that some fluids ex pand and could overflow the bath if not watched Refer to General Operation section 8 for information specific to fluid selection and to the MSDS sheet spe cific to the fluid selected Generally baths are set to one temperature and used to calibrate probes only at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left energized reducing the stress on the system The bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from the bath Cautiously handle probes to prevent personal in jury Carefully place probes on a heat cold resistant surface or rack until they are at room temperature It is a
39. e appropriate caution and safety equipment Fluids may be flammable and require special fire safety equipment and proce dures An important characteristic of the fluid to consider is the flash point The flash point is the temperature at which there is sufficient vapor given off so that when there is sufficient oxygen present and a ignition source is applied the va por will ignite This does not necessarily mean that fire will be sustained at the flash point The flash point may be either of the open cup or closed cup type Either condition may occur in a bath situation The closed cup temperature is 8 General Operation Bath Heat Transfer Fluid 8 1 10 8 1 10 1 8 1 10 2 8 1 10 3 always the lower of the two The closed cup represents the contained vapors in side the tank and the open cup represents the vapors escaping the tank Oxygen and an ignition source will be less available inside the tank Environmentally hazardous fluids require special disposal according to applica ble federal or local laws after use Cost Cost of bath fluids may vary greatly from cents per gallon for water to hun dreds of dollars per gallon for synthetic oils Cost may be an important consid eration when choosing a fluid Commonly Used Fluids Below is a description of some of the more commonly used fluids and their characteristics Water Water is often used because of its very low cost availability and excellent tem perature control
40. e displayed 1200 b i Current baud rate The baud rate of the bath serial communications may be programmed to 300 600 1200 or 2400 baud Use UP or DOWN to change the baud rate value 2400 b New baud rate Press SET to set the baud rate to the new value or EXIT to abort the opera tion and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the serial interface parameter menu The sample period is the time period in seconds between temperature measure ments transmitted from the serial interface If the sample rate is set to 5 the bath transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by SAMPLE ME Serial sample period parameter Press SET to choose to set the sample period The current sample period value will be displayed SR Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value 5A 60 i New sample period Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full du plex or half duplex With full duplex any commands received by the bath via the serial interface are immediately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The du ple
41. e oils have temperature control characteristics which are somewhat poorer than water The viscosity changes significantly with temperature and thermal expansion also occurs These oils have very high electrical resistivity Silicone oils are fairly safe and non toxic These oils are relatively expensive 8 General Operation Bath Heat Transfer Fluid 8 1 11 8 1 11 1 8 1 11 2 Fluid Characteristics Charts Table 2 and Figure 7 on pages 32 and 33 have been created to provide help in selecting a heat exchange fluid media for your constant temperature bath The charts provide both a visual and numerical representation of most of the physi cal qualities important in making a selection The list is not all inclusive many useable fluids may not have been shown in this listing Limitations and Disclaimer Every effort has gone into making these charts accurate however the data here does not imply any guarantee of fitness of use for a particular application Working near the limits of a property such as the flash point or viscosity limit can compromise safety or performance Sources of information sometimes vary for particular properties Your company s safety policies as well as personal judgement regarding flash points toxicity etc must also be considered You are responsible for reading the MSDS sheets and making a judgement here Cost may require some compromises as well Hart Scientific cannot be liable for the suitability of applicat
42. easured 100 1 C giving an error of 0 1 C Computing R and ALPHA Before computing the new values for Rg and ALPHA the current values must be known The values may be found by either accessing the probe calibration 59 7100 Calibration Bath User s Guide 60 11 4 menu from the controller panel or by inquiring through the digital interface The user should keep a record of these values in case they may need to be re stored in the future The new values Ry and ALPHA are computed by entering the old values for Ry and ALPHA the calibration temperature set points t and ty and the temperature errors err and erry into the following equations lyut RY Es LC In ALPHA 41 R 1 ALPHA t err 1 ALPHA t err ty t 1 ALPHA ALPHA l If for example Ry and ALPHA were previously set for 100 000 and 0 0038500 respectively and the data for ty ty erry and erry were as given above then the new values Ry and ALPHA would be computed as 99 885 and 0 0038302 re spectively Program the new values Ry and ALPHA into the controller Check the calibration by setting the temperature to tj and ty and measuring the errors again If desired the calibration procedure may be repeated again to further im prove the accuracy Calibration Example The bath is to be used between 25 and 75 C and it is desired to calibrate the bath as accurately as possible for operation within this range The current val ues for Ry
43. ectors 7 the terminal box for power connection and 8 the bath drain 1 2 3 a 5 The probe connector on the back panel connects the control probe to the temperature controller The stirrer power socket provides power for the stirring motor The system fuses located internally protect against shorted heaters They are each rated at 15 amps Replace only with the same type The heater power socket provides power for the heater element around the stirrer motor shaft If the bath is supplied with a serial RS 232 interface the interface cable is attached to the back of the bath at the connector labelled SERIAL 23 7100 Calibration Bath User s Guide Figure 4 Back Panel 6 Ifthe bath is supplied with a GPIB IEEE 488 interface the interface ca ble is attached to the back of the bath at the connector labelled TEEE 488 7 The terminal box holds the wires for connecting the bath to AC power The bath requires 230 VAC 10 60 Hz 20 A 8 A drain valve is provided for ease of removing the fluid media from the bath Always use a container of adequate size to hold the full load of fluid Some oils are more easily drained at higher temperatures See caution note below 24 7 Parts and Controls Lid 7 4 A WARNING Extreme caution must be maintained to prevent harm to the user or the surrounding environment Do not exce
44. ed a 120 C fluid temper ature for draining The valve could be damaged if 120 C is exceeded Insulate the container from the floor or other objects that may be damaged by high temperatures as required Lid There are two different types of lids see Figure 5 on page 25 The standard lid has a stirring motor with an access hole and the optional fluid level adapter has a cover and sight glass see Figure 6 on page 26 Their features are described with reference to figure numbers as follows Figure 5 Standard Lid Top View 25 7100 Calibration Bath User s Guide 26 7 5 1 The access hole in the lid may be used for filling the bath and inserting devices into the bath Normally this hole should be covered to insulate the bath Covers may be purchased separately from Hart Scientific 2 The motor on the lid drives the stirrer on the standard lid and the pump on the optional pump lid 3 The probe hole is for inserting the control probe into the bath Fluid Level Adapter The fluid level attachment connects to the fluid well by means of a bayonet type mount see Figure 6 It s cover is attached by four screws and the sight glass sits on the cover It is designed to bring the fluid level to the top of the lid for convenience in observing the meniscus of liquid in glass thermometers Figure 6 Fluid Level Adapter 8 General Operation Bath Heat Transfer Fluid 8 1 General Operation Bath Heat Tra
45. ed settings for general operation Bath Temperature Cooling Expansion Expansion Pressure Setting Range C Heating Cooling Power Valve 1 Valve 2 Front Panel 100 to 40 low on high off off 3 Hg Front Panel 40 to 0 low on low on off 70 psi Valve 1 Internal 0 to 40 low on low off on 90 psi Valve 2 Internal 40 to 110 low off N A N A N A N A Readjust to minimum desired temperature for manual operation 58 11 Calibration Procedure Calibration Points 11 11 1 11 2 11 3 Calibration Procedure In some instances the user may want to calibrate the bath to improve the tem perature set point accuracy Calibration is done by adjusting the controller probe calibration constants Ry and ALPHA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set point The thermometer used must be able to measure the bath fluid temper ature with higher accuracy than the desired accuracy of the bath By using a good thermometer and carefully following procedure the bath can be calibrated to an accuracy of better than 0 02 C over a range of 100 degrees Calibration Points In calibrating the bath Ry and ALPHA are adjusted to minimize the set point error at each of two different bath temperatures Any two reasonably separated bath temperatures may be used for the calibration however best results are ob tained when using bath temperatures which are just within the most use
46. eters and settings discussed in Section9 with the exception of the baud rate setting 51 7100 Calibration Bath User s Guide 10 1 1 Wiring The serial communications X RS 232 Cable Wiring for cable attaches to the bath IBM PC and C ibl through the DB 9 connector and Compatibles at the back of the instrument Figure 10 shows the pin out Instrument Computer DTE of this connector and sug Connector Connector gested cable wiring To elim bB S PIn DB 9 Pin inate noise the serial cable LNG e 1060 i 2 RxD 2RxD should be shielded with low 3TxD aro resistance between the con ANC 4 DTR nector DB 9 and the shield See eee 7RTS 7 RTS 8CTS 8CTS 10 1 2 Setup ane ONC Before operation the serial interface of the bath must Instrument Computer DTE first be set up by program Connector Connector ming the baud rate and other DB 9 Pin DB 25 Pin configuration parameters 1NC These parameters are pro 2 RxD s 20 e 3TxD 3RxD grammed within the serial ANC ARTS interface menu 5 a 5CTS 6NC K 6DSR To enter the serial parameter TRIS TOND 8CTS 8DCD programming mode first INC Lo 20DTR press EXIT while pressing Figure 10 Serial Cable Wirin SET and release to enter il the secondary menu Press SET repeatedly until the display reads Pr obE This is the menu selection Press UP repeatedly un til the serial interface menu is indicated with
47. form the Factory Reset Sequence NOTE nsure that a copy of the Report of Test for the unit is available before performing the Fac tory Reset Sequence The Report of Test is needed to restore critical controller parameters One or more burned out heaters or blown heater fuses may also cause this problem If the heaters seem to be burned out contact an Authorized Service Center see Section 1 3 on page 5 for assistance If one or none of the above options apply contact an Au thorized Service Center see Section 1 3 on page 5 for assistance 13 Troubleshooting Troubleshooting Problem Causes and Solutions The controller display flashes Cut out and the heater does not operate The display flashs ut o ut alternately with the process temperature If the process temperature displayed seems grossly in error consult the following problem The display flashes Cut out and an incorrect process temperature Normally the cutout disconnects power to the heater when the bath temperature exceeds the cutout set point causing the temperature to drop back down to a safe value If the cutout mode is set to AUTO the heater Switches back on when the temperature drops If the mode is set to RESET the heater only comes on again when the temperature is reduced and the cutout is man ually reset by the operator see Section 9 2 Cutout Check that the cutout set point is adjusted to 10 or 20 C above the max
48. ful op erating range of the bath The further apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 0 C and 100 C are chosen as the cali bration temperatures then the bath may achieve an accuracy of maybe 0 03 C over the range 10 to 110 C Choosing 30 C and 70 C may allow the bath to have a better accuracy of maybe 0 01 C over the range 25 to 75 C but outside that range the accuracy may be only 0 05 C Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration temperatures First set the bath to the lower set point which we will call t Wait for the bath to reach the set point and allow 15 minutes to stabilize at that temperature Check the bath stability with the thermometer When both the bath and the thermometer have stabilized measure the bath temperature with the thermometer and compute the tempera ture error err which is the actual bath temperature minus the set point temper ature If for example the bath is set for a lower set point of tj Z0 C and the bath reaches a measured temperature of 0 3 C then the error is 0 3 C Next set the bath for the upper set point ty and after stabilizing measure the bath temperature and compute the error errg For this example we will suppose the bath was set for 100 C and the thermometer m
49. ge is an air cooled unit using the refrigerant R 507 The fins of the air cooled condenser must be kept clean Dirty condensers cause inefficiency 8 General Operation Temperature Controller 8 6 and limit the life of the system The first stage must run several minutes before the seond stage starts The second stage is cooled by the first via the heat exchange of the cascade condenser The refrigerant is ethylene cp grade and propane cp grade The system is statically charged Contact an Authorized Service Center if recharg ing is required The refrigeration controls are part of the second stage system Depending on the temperature at which the bath is operated the cooling capacity may require adjustment The cooling capacity is controlled using the COOLING ON OFF switch the COOLING POWER HIGH LOW switch and the COOLING TEM PERATURE adjustment valve At higher temperatures typically about 45 C and above the refrigeration is not required as there is sufficient cooling to the room For controlling in this tem perature range switch the COOLING switch to OFF The cooling may be switched on to more quickly lower the bath temperature from a high temperature Use the COOLING TEMPERATURE knob to adjust the cooling temperature according to the desired bath temperature Use the cooling chart to convert the desired temperature setting to pressure Read the pressure on the outer scale of the guage Allow the refrigeration a few minutes
50. he instrument The instrument display shows n t the model number and the firmware version Each of the controller parameters and calibration constants must be reprogrammed The values can be found on the Report of Test that was shipped with the instrument 67 7100 Calibration Bath User s Guide Problem Causes and Solutions The displayed process tempera ture is in error and the controller remains in the cooling or the heating state at any set point value Possible causes may be either a faulty control probe or erroneous data in memory The probe may be disconnected burned out or shorted The probe is located inside the stirrer motor cover Check that the probe is connected properly The probe may be checked with an ohmmeter to see if it is open or shorted The probe is a platinum 4 wire Din 43760 type The resistance should read 0 2 to 2 0 ohms between pins 1 and 2 on the probe connector and 0 2 to 2 0 ohms between pins 3 and 4 It should read 100 to 300 ohms between pins 1 and 4 depending on the tempera ture If the probe appears to be defective contact an Au thorized Service Center see Section 1 3 on page 5 for assistance e f the problem is not the probe erroneous data in mem ory may be the cause Re initialize the memory as dis cussed in the problem The display flashes cutout and an incorrect process temperature If the problem re mains the cause may be a defective electronic compo
51. he cut out is active and the cut out mode is set to manual r ESEE then the display flashes cut out until the user resets the cut out To access the reset cut out function press the SET button Access cut out reset function The display indicates the reset function 37 7100 Calibration Bath User s Guide Figure 8 Controller Operation Flowchart 38 Display Temperature Secondary Functions I UP q DOWN 4 SET Menu SET gt Operating Parameters Reset Mode UP SET EXIT EXIT SET EXIT Y ALPHA a SET EXIT Adj Cutout Reset Mode SET EXIT SET EXIT o 5 E 5 E Adi Duplex Mode SET EXIT linefeed c E SET E E Adjust Linefeed SET EXIT Cd Interface Option Installed gt SET EXIT
52. he set point value Accept selected set point memory Set point Value The set point value may be adjusted after selecting the set point memory and pressing SET The set point value is displayed with the units C or F at the left t 468 00 Set point 4 value in C If the set point value need not be changed then press EXIT to resume dis playing the bath temperature Press UP or DOWN to adjust the set point value Increment display 4e 5 i New set point value When the desired set point value is reached press SET to accept the new value and access the set point vernier If EXIT is pressed instead then any changes made to the set point will be ignored SET Accept new set point value Set point Vernier The set point value can be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a more precise bath temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed from the set point by pressing SET The vernier setting is displayed as a 6 digit num ber with five digits after the decimal point This is a temperature offset in de grees of the selected units C or F 0 00000 E Current vernier value in C To adjust the vernier press UP or DOWN Unlike most functions the ver
53. ifted When uncrating the bath remove all of the accessories from the packing foam around the bath Remove the pre formed foam Gently ease the bath from the crate using the casters to roll the bath If it is required to lift the bath slightly to release it from the crate two people should carefully slide their hands under the bath and gently lift the bath only enough to clear the packing foam and roll the bath from the crate The area containing the compressors will be heavier than the rest of the bath If it is required to move the bath after installation empty the bath of fluid DONOT move a bath filled with fluid The back of the bath which is where the compressors are located is heavier than the front To safely move the bath two people are required Do not attempt to carry the bath it is tall and ex tremely heavy Personal injury or damage to the bath may occur Bath Environment The Model 7100 Bath is a precision instrument which should be located in an appropriate environment The location should be free of drafts extreme temper atures and temperature changes dirt etc The surface where the bath is placed must be level If used at higher temperatures where fluid vaporization is significant a fume hood should be used Dry out Period Before initial use after transport and any time the instrument has not been en ergized for more than 10 days the bath will need to be energized for a dry out period of 1 2 hours
54. imum bath operating temperature and that the cutout mode is set as desired If the cutout activates when the bath temperature is well below the cutout set point or the cutout does not reset when the bath temperature drops and it is manually re set then the cutout circuitry or the cutout thermocouple sensor may be faulty or disconnected Contact an Au thorized Service Center see Section 1 3 on page 5 for assistance The display flashes cutout and an incorrect process temperature The problem may be that the controller s voltmeter circuit is not func tioning properly A problem could exist with the memory back up battery If the battery voltage is insufficient to maintain the mem ory data may become scrambled causing problems A nearby large static discharge may also affect data in memory Verify that the parameters on the Report of Test are accurate Cycle the power off disconnect the bath from AC and then restart the bath If the problem reoccurs the battery should be replaced Contact an Authorized Service Center see Section 1 3 on page 5 for assistance If initializing the memory does not remedy the problem there may be a failed electronic component Contact an Authorized Service Center see Section 1 3 on page 5 for assistance The controller may need to be reset Perform the follow ing Factory Reset Sequence Factory Reset Sequence Hold the SET and EXIT but tons down at the same time while powering up t
55. ion Valve 2 f5 f5 f5 9 15 1 Set Expansion Valve 2 f5 1 0 Dor1 Set Expansion Valve 2 to on f5 n f5 1 Set Expansion Valve 2 to off f5 n f5 0 Legend Note Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user When DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a carriage return and linefeed Then the value is returned as indicated in the RETURNED column 10 4 1 10 4 2 tions with the digital interface These are 1 heater power high low 2 cooling on off 3 expansion valve 1 on off 4 cooling power high low and 5 expan sion valve 2 on off Heater Control To control the heater with the digital interface the front panel heater switch must be set to LOW 350 W The heater function is controlled with the F1 command Setting the F1 parameter to 0 sets the heater to LOW 350 W and setting it to 1 sets the heater to HIGH 700 W Sending FI with no value causes the controller to return a value showing what the heater setting is When the heater setting is changed a pop is heard as the heater relay opens or closes Cooling Control To control the refrigeration power with the serial interface the front panel cool ing switch must be off The refrigeration power function is controlled with se rial F2 command Setting the F2 value to O turns the refrigeration off and
56. ion or for any personal injury damage to equip ment product or facilities in using these fluids The charts include information on a variety of fluids which are often used as heat transfer fluid in baths Because of the temperature range some fluids may not apply to your bath About the Graph The fluid graph visually illustrates some of the important qualities of the fluids shown Temperature Range The temperature scale is shown in degrees Celsius A sense of the fluid s general range of application is indicated Qualities including pour point freeze point important viscosity points flash point boiling point and others may be shown Freezing Point The freezing point of a fluid is an obvious limitation to stir ring As the freezing point is approached high viscosity may also limit good stirring Pour Point The pour point represents a handling limit for the fluid Viscosity Points shown are at 50 and 10 centistokes Greater than 50 centi stokes stirring is very poor and unsatisfactory for bath applications At 10 centistokes and below optimum stirring can occur These are rules of thumb which have been useful for most applications Fume Point The point at which a fume hood should be used This point is very subjective in nature and is impacted by individual tolerance to different fumes and smells how well the bath is covered the surface area of the fluid in the bath the size and ventilation of the facility where the bath
57. ions change Of these the most significant factors affecting the op timum proportional band width are heater power setting and fluid viscosity The proportional band should be wider when the higher power setting is used so that the change in output power per change in temperature remains the same The proportional band should also be wider when the fluid viscosity is higher because of the increased response time The proportional band width is easily adjusted from the bath front panel The width may be set to discrete values in degrees C or F depending on the selected units The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the control ler percent output power display Narrow the proportional band width to the point at which the bath temperature begins to oscillate and then increase the band width from this point to 3 or 4 times wider Table 3 lists typical propor 43 7100 Calibration Bath User s Guide tional band settings for optimum performance with a variety of fluids at se lected temperatures The proportional band adjustment may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional band fexr Access heater power in secondary menu le Pet Heater power in percent Table 3 Proportional Band Fluid Table Proportional
58. is located and others The bath should be well covered at this point This is also subject to company policies and safety rules 31 7100 Calibration Bath User s Guide Table2 Table of Bath Fluids and Their Characteristics Fluid Lower Upper Thermal Thermal Hart PartNo Temperature Temperature Flash Viscosity Specific Specific Heat Conductivity Expansion Resistivity Limit Limit Point centistokes Gravity cal g C cal s em C cm cm C 1020 cm Halocarbon 0 8 100 C v 70 C e NONE 5 7 50 C 1 71 0 40 C 0 2 0 0004 0 0011 5019 0 8 40 C 0 5 70 C Methanol 96 C fr 10 C fl cc 12 C 1 3 35 C 0 810 0 C 0 6 0 0005 20 C 0 0014 25 C 0 66 0 C 0 792 20 C 0 45 20 C Water 0 C fr 95 C b NONE 1 25 C 1 00 1 00 0 0014 0 0002 25 C 0 4 75 C Ethylene 30 C fr 90 C b NONE 7 0 C 1 05 0 8 0 C 0 001 Glycol 50 5020 2 50 C 0 7 100 C Mineral Oil No 7 10 C v 166 C fl 168 C 150 75 C 0 87 25 C 0 48 25 C 0 00025 25 C 0 0007 50 C 5 25 C 5011 5 125 C 0 84 75 C 0 53 75 C 0 81 125 C 0 57 125 C Silicone Oil Type 40 C v 130 C fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 25 C 0 00105 1000 25 C 200 05 5010 10 150 C Silicone Oil Type 30 C v 209 C fl cc 211 C 10 25 C 0 934 25 C 0 43 40 C 0 00032 25 C 0 00108 1000 25 C 200 10 5012
59. l Operation section Section9 for more information about the different types of fluids used in calibration baths Depending on the cleanliness of the environment the internal parts parts behind the front cover only of the cold bath should be cleaned and or checked at least every month for dust and dirt Particular attention should be paid to the condensing coil fins The fins should be vacuumed or brushed free of dust and dirt on a regular basis Dust and dirt inhibit the operation of the condensing coil and thus compromise the performance and life time of the cooling system If a hazardous material is spilt on or inside the equipment the user is re sponsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material MSDS sheets ap 63 7100 Calibration Bath User s Guide plicable to all fluids used in the baths should be kept in close proximity to the instrument If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the bath If there are any questions call an Authorized Service Center for more information Before using any cleaning or decontamination method except those rec ommended by Hart users should check with an Authorized Service Cen ter to be sure that the proposed method will not damage the equipment If the instrument is used in a manner not in accordance with the equip ment design the ope
60. listed in this section see Table 4 These commands are used with both the RS 232 serial interface and the IEEE 488 GPIB interface In ei ther case the commands are terminated with a carriage return character The in terface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters which determines a unique command A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example s lt CR gt will return the current set point and s 50 00 lt CR gt will set the set point to 50 00 degrees In the following list of commands characters or data within brackets and are optional for the command A slash denotes alternate characters or data Numeric data denoted by n may be entered in decimal or exponential notation Characters are shown in lower case although upper case may be used Spaces may be added within command strings and will simply be ignored Backspace BS ASCII 8 may be used to erase the previous character A termi nating CR is implied with all commands Power Control Functions The digital interface is capable of controlling the heating and cooling functions so that the bath can be remotely operated at any temperature within the range of the bath To allow the interface to control the heating and the
61. lly an advan tage however since small amounts of water less than 1196 mixed with metha nol decreases the freezing point The resulting low temperature capability can be well below 100 C but the viscosity can become excessive at such low tem peratures The ideal methanol water solution to be used to 100 C should be 29 7100 Calibration Bath User s Guide 30 8 1 10 4 8 1 10 5 8 1 10 6 approximately 95 methanol and 5 water by volume or approximately 93 methanol and 796 water by weight The viscosity is quite acceptable from 80 C up A mixture of 50 50 methanol and water provides a non flammable solution capable of attaining 40 C Because methanol has an infinite capabil ity to absorb water there is no ice formation below 0 C This is convenient for long term use The mixture has poor electrical resistivity and so may not be suitable for some applications The primary disadvantage with methanol is its toxicity It is also quite flamma ble Some labs may not permit its use Refer to the MSDS sheets for more in formation Use methanol only in a well ventilated area and use a hood that draws the vapors away from the user at temperatures above 0 C Halocarbon 0 8 Halocarbon 0 8 is a low temperature fluid with a wide temperature range It may be used as low as 90 to 100 C before viscosity becomes too great It may be used as high as 70 C before evaporation becomes excessive Halocarbon 0 8 does not absor
62. ly To eliminate noise the GPIB cable should be shielded Setup To use the IEEE 488 interface first connect an IEEE 488 standard cable to the back of the bath Next set the device address This parameter is programmed within the IEEE 488 interface menu To enter the IEEE 488 parameter programming menu first press EXIT while pressing SET and release to enter the secondary menu Press SET repeat edly until the display reaches Pr 0b E This is the menu selection Press UP repeatedly until the IEBE 488 interface menu is indicated with EEE Press 53 7100 Calibration Bath User s Guide SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter 10 2 1 1 IEEE 488 Interface Address The IEEE 488 address is prompted with Addr E55 Press SET to program the address The default address is 22 Change the device address of the bath if necessary to match the address used by the communication equipment by pressing UP or DOWN and then SET 10 2 2 IEEE 488 Operation 54 10 3 10 4 Commands may now be sent via the IEEE 488 interface to read or set the tem perature or access other controller functions All commands are ASCII charac ter strings and are terminated with a carriage return CR ASCII 13 Interface commands are listed below Interface Commands The various commands for accessing the bath controller functions via the digi tal interfaces are
63. ly to 50 at 40 C e pressure 75kPa 106kPa e mains voltage within 10 of nominal 7100 Calibration Bath User s Guide e vibrations in the calibration environment should be minimized e altitude does not effect the performance or safety of the unit 10 4 Quick Start Unpacking 4 4 1 4 2 4 3 Quick Start A CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the war ranty This section gives a brief summary of the steps required to set up and operate the 7100 bath This should be used as a general overview and reference and not as a substitute for the remainder of the manual Please read Section5 through7 carefully before operating the bath Unpacking Unpack the bath carefully and inspect it for any damage that may have oc curred during shipment If there is shipping damage notify the carrier immediately Verify that all components are present e 7100 Bath e Access Hole Cover e Controller Probe e Users Guide e Drain Elbow e Report of Test e Fill Hole Cover e 9930 Interface it Software and Users Guide optional If you are missing any item please call an Authorized Service Center see Sec tion 1 3 Semi Hermetic Compressor The semi hermetic compressor s located below the bath have had their mounting hardware tightened down to avoid damage during shipment In addi tion shipping foam has been placed between some of
64. mal expansion describes how the volume of the fluid changes with temper ature Thermal expansion of the fluid used must be considered since the in crease in fluid volume as the bath temperature increases may cause overflow Excessive thermal expansion may also be undesirable in applications where constant liquid level is important Oils typically have significant thermal expansion Electrical Resistivity Electrical resistivity describes how well the fluid insulates against the flow of electric current In some applications such as measuring the resistance of bare temperature sensors it may be important that little or no electrical leakage oc cur through the fluid In this case consider a fluid with very high electrical resistivity Fluid Lifetime Many fluids degrade over time because of vaporization water absorption gel ling or chemical breakdown Often the degradation becomes significant near the upper temperature limit of the fluid Safety When choosing a fluid always consider the safety issues associated Obviously where there are conditions of extreme hot or cold there can be danger to people and equipment Fluids may also be hazardous for other reasons Some fluids may be considered toxic Contact with eyes skin or inhalation of vapors may cause injury A proper fume hood must be used if hazardous or bothersome va pors are produced WARNING Fluids at high temperatures may pose danger from BURNS FIRE and TOXIC fumes Us
65. meter refers to the average sensitivity of the probe between 0 and 100 C Normally this is set for 0 00385 C Operating Parameters The operating parameters menu is indicated by PAr Operating parameters menu Press SET to enter the menu The operating parameters menu contains the cut out reset mode parameter Cut out Reset Mode The cut out reset mode determines whether the cut out resets automatically when the bath temperature drops to a safe value or must be manually reset by the operator The parameter is indicated by Cut out reset mode parameter Press SET to access the parameter setting Normally the cut out is set for manual mode Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SEcIRL Serial RS 232 interface parameters menu The Serial interface parameters menu contains parameters which determine the operation of the serial interface These controls only apply to baths fitted with the serial interface The parameters in the menu are baud rate sample pe riod duplex mode and linefeed Baud Rate The baud rate is the first parameter in the menu The baud rate setting deter mines the serial communications transmission rate 47 7100 Calibration Bath User s Guide 48 9 12 2 9 12 3 The baud rate parameter is indicated by pouce Press SET to choose to set the baud rate The current baud rate value will then b
66. n 6 Bath Use before placing the bath into service DO NOT turn the bath on without fluid in the tank and the heating coils fully immersed DO NOT change the values of the bath calibration constants from the fac tory set values The correct setting of these parameters is important to the safety and proper operation of the bath The refrigeration may be damaged or the lifetime shortened if the set point temperature is set above 60 C for more than one hour with the refrigeration manually on Ensure that the refrigeration is off when the bath is used above 60 C The Factory Reset Sequence should be performed only by authorized personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Test to restore the test pa rameters DO NOT operate this instrument in an excessively wet oily dusty or dirty environment Most probes have handle temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the instrument The instrument and any thermometer probes used with it are sensitive in struments that can be easily damaged Always handle these devices with care Do not allow them to be dropped struck stressed or overheated 1 Before You Start Authorized Service Centers 1 3 COLD BATHS Refrigerated baths require that the condensing coil be cleaned periodi cally Accumulation of dust and dirt on the condenser will result in pre
67. n constants namely CTO BO BG H and L These values are set at the fac tory and must not be altered The correct values are important to the accuracy and proper and safe operation of the bath Access to these parameters is avail able to the user so that if the controller s memory fails the user may restore these values to the factory settings The user should have a list of these con stants and their settings with the manual WARNING DO NOT change the values of the bath calibration constants from the factory set values The correct setting of these parameters is im portant to the safety and proper operation of the bath The calibration parameters menu is indicated by Calibration parameters menu Press SET five times to enter the menu CTO Parameter CTO sets the calibration of the over temperature cut out This is not adjustable by software but is adjusted with an internal potentiometer For the 7100 baths this parameter should read 120 BO and BG These parameters calibrate the accuracy of the bath set point These are pro grammed at the factory when the bath is calibrated Do not alter the value of these parameters If the user desires to calibrate the bath for improved accuracy then calibrate RO and ALPHA according to the procedure given in Sectionl 1 HandL These parameters set the upper and lower set point limits of the bath DO NOT change the values of these parameters from the factory set values To do so may
68. n or closed cup flash point See Figure 7 on page 33 Boiling Point At the boiling point of the fluid the temperature stability is diffi cult to maintain Fuming is excessive Excessive amounts of heater power may be required because of the heat of vaporization Decomposition All high temperature fluids may reach a temperature point at which decomposition of some form will begin While it always begins slowly at some lower temperature the rate can increase to the point of danger or imprac ticality at a higher temperature 8 General Operation Stirring 100 C 0 C Silicone Oil 5017 Silicone Oil 5014 Silicone Oil 5013 Silicone Oil 5012 Silicone Oil 5010 HFE 7500 5023 Halocarbon 5019 Mineral Oil 5011 Water Methanol Ethanol Ethylene Glycol i 50 50 with H20 5020 Dynalene HF LO 5022 Bath Salt 5001 100 C 200 C 300 C 400 C 500 C 600 C FL 302 C FL 280 C FL 232 C FL 211 C FL 177 C Shaded area represents usable range of fluid starting at 50 centistokes Lighter shading represents decreasing SO A Decomposition Starts m BP Boiling Point CS Centistokes viscosity while vaporization and decomposition increase EP Evaporation Point fluid loss viscosity E Black area represents liquid
69. nent contact an Authorized Service Center see Section 1 3 on page 5 for assistance The controller controls or at tempts to control at an inaccurate temperature 68 The controller operates normally except when controlling at a speci fied set point At this set point the temperature displayed does not agree with the temperature measured by the user s reference ther mometer to within the specified accuracy This problem may be caused by an actual difference in temperature between the points where the control probe and thermometer probe measure tempera ture by erroneous bath calibration parameters or by a damaged con trol probe Check the vernier setting for the setpoint Check that the bath has an adequate amount of fluid in the tank and that the stirrer is operating properly Check the resistance between the pins and the sheath of the probe They should be open Check that the thermometer probe and control probe are both fully inserted into the bath to minimize temperature gradient errors Check that the calibration parameters are all correct ac cording to the Report of Test If not re program the con stants The memory backup battery may be weak causing errors in data as described in the problem The display flashes cutout and an incorrect process tem perature Check that the control probe has not been struck bent or damaged If the cause of the problem remains un known contact an Authorized Service Center
70. nsfer Fluid Many fluids will work with 7100 bath Choosing a fluid requires consideration of many important characteristics of the fluid Among these are temperature range viscosity specific heat thermal conductivity thermal expansion electri cal resistivity fluid lifetime safety and cost Temperature Range One of the most important characteristics to consider is the temperature range of the fluid Few fluids work well throughout the complete temperature range of the bath The temperature at which the bath is operated must always be within the safe and useful temperature range of the fluid used The lower tem perature range of the fluid is determined by the freeze point of the fluid or the temperature at which the viscosity becomes too great The upper temperature is usually limited by vaporization flammability or chemical breakdown of the fluid Vaporization of the fluid at higher temperatures may affect temperature stability because of cool condensed fluid dripping into the bath from the lid The bath temperature should be limited by setting the safety cut out so that the bath temperature cannot exceed the safe operating temperature limit of the fluid Viscosity Viscosity is a measure of the thickness of a fluid how easily it can be poured and mixed Viscosity affects the temperature uniformity and stability of the bath With lower viscosity fluid mixing is better therefore creating a more uni form temperature throughout the
71. nto a mains outlet of the proper voltage frequency and current capability 230 VAC 10 60 Hz 15 amp 50 Hz optional Set the HEATER switch on the front panel to position LOW and turn the bath on using the front panel POWER switch The bath will turn on and begin to heat or cool to reach the previously programmed temperature set point The front panel LED display will indicate the actual bath temperature 4 Quick Start Setting the Temperature 4 5 Setting the Temperature In the following discussion and throughout this manual a button around the word SET UP EXIT or DOWN indicates the panel button while the dotted box indicates the display reading Explanation of the button or display reading are to the right of each button or display value To view or set the bath temperature set point proceed as follows The front panel LED display normally shows the actual bath temperature 24 68 Bath temperature display When SET is pressed the display shows the set point memory that is cur rently being used and its value Eight set point memories are available SET Access set point selection I 25 0 E Set point 1 25 0 C currently used Press SET to select this memory and access the set point value SET Access set point value t 25 00 Current value of set point 1 25 00 C Press SET to accept the new value and display the vernier value The bath be gins heating or cooling to the new set point
72. of the battery If the outside of the bath becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint Periodically check the fluid level in the bath to ensure that the level has not dropped A drop in the fluid level affects the stability of the bath Changes in fluid level are dependent upon several factors specific to the environment in which the equipment is used A schedule cannot be out lined to meet each environmental setting Therefore the first year the bath should be checked weekly with notes kept as to changes in bath fluid Af ter the first year the user can set up a maintenance schedule based on the data specific to the application Heat transfer medium lifetime is dependent upon the type of medium and the environment The fluid should be checked at least every month for the first year and regularly thereafter This fluid check provides a baseline for knowledge of bath operation with clean usable fluid Once some fluids have become compromised the break down can occur rapidly Particular attention should be paid to the viscosity of the fluid A significant change in the viscosity can indicate that the fluid is contaminated being used out side of its temperature limits contains ice particles or is close to a chemi cal breakdown Once data has been gathered a specific maintenance schedule can be outline for the instrument Refer to the Genera
73. ont Panel 21 7100 Calibration Bath User s Guide 22 7 2 SET Used to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of settable parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored 3 The on off switch controls power to the entire bath including the stirring motor 4 The control indicator is a two color light emitting diode LED This in dicator lets the user visually see the ratio of heating to cooling When the indicator is red the heater is on When the indicator is green the heater is off and the bath is cooling 5 The heater power switch is used to select the appropriate heater power levels for heating and controlling temperatures 6 The cooling switch controls power to the cooling compressors and cool ing fan Refrigeration Controls The front panel refrigeration control area has four features see Figure 3 bot tom 7 the cooling power switch 8 the cooling temperature regulating valve 9 the cooling temperature pressure gauge and 10 cascade refrigeration indi cator lights 7 The cooling power switch is used to control the cooling capacity It is set to LOW power for higher bath temperatures 40 C and above This switch limits the capacity of the refrigeration system so that the mini mum cooling po
74. present danger of the bath exceeding its temperature range causing damage or fire 10 Digital Communication Interface Serial Communications 10 10 1 Digital Communication Interface If supplied with the option the 7100 bath is capable of communicating with and being controlled by other equipment through the digital interface Two types of digital interface are available the RS 232 serial interface and the IEEE 488 GPIB interface With a digital interface the bath may be connected to a computer or other equipment This allows the user to set the bath temperature monitor the tem perature and access any of the other controller functions all using remote com munications equipment In addition the heater power setting and cooling capacity may be controlled using the interface To enable the heater to be switched to high using the interface the HEATER switch must be set to the LOW position The COOLING switch must be set to OFF and the COOL ING POWER switch set to HIGH to enable remote control Adjust the cool ing temperature to the minimum desired Digital Interface Setup HEATER switch LOW COOLING switch OFF COOLING POWER switch HIGH COOLING TEMPERATURE minimum desired Serial Communications The bath may be installed with an RS 232 serial interface that allows serial dig ital communications over fairly long distances With the serial interface the user may access any of the functions param
75. r and is mechanically shock sensitive Drop ping striking or other physical shock may cause a shift in resistance in the probe resulting in diminished bath accuracy If damaged the probe can be re placed Contact an Authorized Service Center for assistance Insert the probe into the 1 4 inch probe hole in the top of the bath lid The tip of the probe must be well immersed in the fluid The probe connector is plugged into the rear of the bath into the socket labelled PROBE Power With the bath power switch off connect the bath to an AC mains supply of 230 VAC 10 60 Hz 20 A 50 Hz optional The bath power wires are located at the junction box at the back of the bath The wires are left undressed to ac commodate a variety of connection scemes Observe the correct wiring of the power wires 5 Installation Power BROWN 230 VAC 60 Hz 50 Hz line 1 BLUE 230 VAC 60 Hz 50 Hz line 2 GREEN YELLOW Ground NOTE Units are specific to line frequency They are either 50 or 60 Hz NOT BOTH 50 Hz units made to operate on 230 250 volts are supplied with a transformer that reduces the voltage to the compressors to a nomi nal operating 200 volts 50 Hz units made to operate on 200 230 volts are not supplied with a transformer Use only wires and a circuit which are capable of supplying the maximum 20 amperes of current The wires must be fastened securely and insulated well Plug the stirring motor power cord into th
76. range with excessive E REA Range over which a fume hood is recommended Figure 7 Chart of Various Bath Fluids 8 2 Stirring due to evaporation FL Flash Point FR Freeze Point PP Pour Point Stirring of the bath fluid is very important for stable temperature control The fluid must be mixed well for good temperature uniformity and fast controller response The stirrer is precisely adjusted for optimum performance 33 7100 Calibration Bath User s Guide 34 8 3 8 4 8 5 Power Power to the bath is provided by an AC mains supply of 230 VAC 10 60 Hz 20 A 50 Hz optional Power to the bath passes through a filter to prevent switching spikes from being transmitted to other equipment To turn on the bath switch the control panel power switch to the ON position The stirring motor will turn on the LED display will begin to show the bath temperature and the heater will turn on or off until the bath temperature reaches the programmed set point When powered on the control panel display will briefly show a four digit num ber This number indicates the number of times power has been applied to the bath Also briefly displayed is data which indicates the controller hardware configuration This data is used in some circumstances for diagnostic purposes Heater The power to the bath heater is precisely controlled by the temperature control ler to maintain a constant bath temperature Power is controlled
77. ration of the bath may be impaired or safety hazards may arise The over temperature cut out should be checked every 6 months to see that it is working properly In order to check the user selected cut out fol low the controller directions Section9 2 for setting the cut out Both the manual and the auto reset option of the cut out should be checked Set the bath temperature higher than the cut out Check to see if the display flashes cut out and the temperature is decreasing WARNING When checking the over temperature cut out be sure that the temperature limits of the bath fluid are not exceeded Exceeding the tem perature limits of the bath fluid could cause harm to the operator lab and instrument 64 13 Troubleshooting Troubleshooting 13 13 1 Troubleshooting This section contains information on troubleshooting and a wiring diagram This information pertains to a number of bath models and certain specifics may not pertain to your model Troubleshooting In the event that the instrument appears to function abnormally this section may help to find and solve the problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please read this section carefully and attempt to understand and solve the problem If the probe seems faulty or the problem cannot otherwise be solved contact an Authorized Service Center see Section 1 3 on page 5 for assistance Be sure
78. setting it to 1 turns it on F2 alone returns O or 1 showing the state of the re frigeration power control 57 7100 Calibration Bath User s Guide The F3 and F5 commands control the cooling temperature or expansion valves These valves adjust the cooling temperature which sets the cooling ca pacity Setting F3 to O turns off valve 1 and setting F3 to 1 turns on valve 1 Setting ES to 0 turns off valve 2 and seting F5 to 1 turns valve 2 on A command with no value returns the current value Setting F3 and F5 to off leaves the front panel valve active It should be used for the lowest of the cool ing temperatures To control the cooling power the COOLING POWER switch must be in the HIGH position Command F4 controls the cooling power Setting the F parameter to O switches cooling to high power and 1 switches to low power Refer to Table 8 for nominal settings for different temperature ranges Actual pressures may ve varied for specific applications Table 7 Serial power control functions Function Command 0 1 Heater F1 low high Refrigeration F2 off on Exp Valve 1 F3 off on Cooling Power F4 high low Exp Valve 2 F5 off on Table 7 summarizes the serial control functions for heating and cooling Table 8 shows the recommended control settings for each operating temperature range The ranges may need to be adjusted depending on the bath and its particular use Table 8 Recommend
79. stivity s sup RU P be C e xePOP RES HS 28 8 1 7 Fluid Lifetime yae vip eb dem e k a EA om Ram xo cR pod o ES 28 8 1 8 Safety ese vg qoe ps SE RA d SEX AU OR P a Ra ee ae eo 28 8 1 9 COSE qiue kw ede x ON us ud de ERU EEA UR e od e up BS 29 8 1 10 Commonly Used Fluids 1 uu meme m E Se ae ae sia ee ws 29 SLIDI Water os gk ic a SE da CRUEL NUN S WOW S Prec eee ae n cR 29 ELIO Bfhylene Gly Col sg cee do ederet dee Wid xc Behe arg EGRE x 29 8 1 10 3 M thanol 2 2 aio e E oh aul RU dos e a UR ee Ole d 29 8 1104 Halocarbon 0 8 se ages ss wh Soda dicks doge ST DOR OR Krad GN Re 30 SOS Mineral Oll 0 ees cde ceca deh Hee ks dra qase xe x he Xepq ae oe BEG 30 1 10 6 Silicon amp il zs cle uos RA onu AA 30 8 1 11 Fluid Characteristics Charts o ee ee 31 8 1 11 1 Limitations and Disclaimer 52 oom R9 RR e S xc ws 31 SLIL Aboutthe Graph si eR eo RUE RUF ROGER UR Rk RUS a X 31 SITIOS db 33 ROWE lt 2 cce Re ote RE e t S a A 34 Galen SATIRE Gs a E 34 Cooling 2 242354 baa eee ee aed boos 34 Temperature Controller ep css eb eee Rm 35 9 Controller Operation 37 9 1 9 2 9 3 9 4 9 5 9 6 9 7 9 8 9 9 Bath Temperature iea eco o RR Roy RE XO E po ps 37 ResetCuto t coreo cosa do EEG a 37 Temperature Set point lt so s c tecc lle 39 9 3 1 Programmable Set points as adora ta oo 39 9 3 2 Setpoint Values aia xe mm a em oe wee ao es 40 9 3 3 Setpoint VEN a AC ed See
80. tally eliminated Even though all baths have horizontal and vertical gradients these gradients are minimized inside the bath work area Nevertheless probes should be inserted to the same depth in the bath liquid Be sure that all probes are inserted deep enough to prevent stem effect From research at Hart Scien tific we suggest a general rule of thumb for immersion depth to reduce the stem effect to a minimum 15 x the diameter of the UUT the sensor length Do not submerge the probe handles If the probe handles get too warm during calibration at high temperatures a heat shield could be used just below the probe handle This heat shield could be as simple as aluminum foil slid over the probe before inserting it in the bath or as complicated as a specially designed reflective metal apparatus When calibrating over a wide temperature range better results can generally be achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The ob ject is to keep the reference probe and the probe s to be calibrated as closely grouped as possible in the working area of the bath Bath stability is maximized when the bath working area is kept covered In preparing to use the bath for calibration start by e Placing the reference probe in the bath working area e Pla
81. tection device the controller is also 35 7100 Calibration Bath User s Guide 36 equipped with a separate thermocouple temperature monitoring circuit that shuts off the heater if the temperature exceeds the cut out set point The controller allows the operator to set the bath temperature with high resolu tion set the cut out adjust the proportional band monitor the heater output power and program the controller configuration and calibration parameters The controller may be operated in temperature units of degrees Celsius or Fahr enheit The controller is operated and programmed from the front control panel using the four key switches and digital LED display The controller may also be optionally equipped with a serial RS 232 or IEEE 488 GPIB digital interface for remote operation Operation of the controller using the front control panel is discussed following in Section9 Operation using the digital interfaces is dis cussed in Section10 When the controller is set to a new set point the bath heats or cools to the new temperature Once the new temperature is reached the bath usually takes 10 15 minutes for the temperature to settle and stabilize There may be a small over shoot or undershoot of about 0 5 C 9 Controller Operation Bath Temperature 9 1 9 2 Controller Operation This section discusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key s
82. ters which are programmable via the front panel These are ac cessed from the secondary menu after the cut out set point function by pressing SET There are 5 sets of configuration parameters probe parameters oper ating parameters serial interface parameters IEEE 488 interface parameters and controller calibration parameters The menus are selected using the UP and DOWN keys and then pressing SET Probe Parameters The probe parameter menu is indicated by P ObE Probe parameters menu Press SET to enter the menu The probe parameters menu contains the pa rameters RO and ALPHA which characterize the resistance temperature rela tionship of the platinum control probe These parameters may be adjusted to improve the accuracy of the bath This procedure is explained in detail in Sectionll The probe parameters are accessed by pressing SET after the name of the pa rameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After the desired value is reached press SET to set the parameter to the new value Pressing EXIT will cause the parameter to be skipped ignoring any changes that may have been made RO This probe parameter refers to the resistance of the control probe at 0 C Nor mally this is set for 100 000 ohms 9 Controller Operation Operating Parameters 9 10 2 9 11 9 11 1 9 12 9 12 1 ALPHA This probe para
83. the bath If the cut out is activated because of excessive bath temperature then power to the heater is shut off and the bath cools The bath cools until it reaches a few degrees below the cut out set point temperature At this point the action of the cut out is determined by the setting of the cut out mode parameter The cut out has two selectable modes automatic reset or manual reset If the mode is set to automatic then the cut out automatically resets itself when the bath tempera ture falls below the reset temperature allowing the bath to heat up again If the mode is set to manual then the heater remains disabled until the user manually resets the cut out The cut out set point may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET twice to access the cut out set point exa Access heater power in secondary menu Heater power in percent 45 7100 Calibration Bath User s Guide 46 9 9 9 10 9 10 1 To change the cut out set point press UP or DOWN Decrement display CO 95C E New cut out set point To accept the new cut out set point press SET SET Accept cut out set point The next function is the configuration menu Press EXIT to resume display ing the bath temperature Controller Configuration The controller has a number of configuration and operating options and calibra tion parame
84. the refrigeration lines for the same purpose Upon installation please remove all pieces of the shipping foam and adjust the compressor s hardware for proper vibration absorption as illustrated below in Figure 2 Set Up Set up of the bath requires careful unpacking and placement of the bath filling the bath with fluid installing the probe and connecting power Consult Sec 11 7100 Calibration Bath User s Guide 4 4 TOP VIEW OF COMPRESSOR Adjus EN 9 HARDWARE ADJUSTED NS FOR SHIPPING Adjust BACK OF BATH po HARDWARE ADJUSTED FOR OPERATION Figure 2 Semi hermetic Compressor tion5 for detailed instructions for proper installation of the bath Be sure to place the bath in a safe clean and level location Fill the bath tank with an appropriate fluid For operation at bath temperatures above 0 C clean distilled water works well For lower temperatures fluids such as methanol and Halocarbon may be used Carefully pour the fluid into the bath tank through the access hole above the tank avoiding spilling any fluid The fluid must not exceed a height of 1 2 inch below the top of the tank The control probe must be inserted through the lid into the bath and plugged into the socket at the back of the bath The bath stirrer and haeater must be plugged in Connectors are different to prevent improper connections Power Plug the bath power cord i
85. to have the instrument model number serial number voltage and problem de scription available 65 7100 Calibration Bath User s Guide 66 Problem Causes and Solutions The heater indicator LED stays red but the temperature does not increase The display does not show ut out nor displays an incorrect bath temperature and the controller otherwise appears to operate nor mally The problem may be insufficient heating no heating at all or too much cooling Insufficient heating may be caused by the heater power setting being too low especially at higher operating tem peratures Switching to the higher heater power switch setting may solve the problem Try reducing cooling capacity by increasing the cooling temperature switching the cooling power switch to LOW or switching off the cooling altogether Insure that normal operating parameters are not exceeded when adjusting cooling capacities for a given temperature If the heater seems to not be receiving power at all first check the heater fuses If a fuse is burned out try re placing the fuse with a new one of the type and rating and then check to see if the bath resumes normal opera tion If the fuse blows again there may be a shorted heater As a last resort a Factory Reset Sequence may need to be performed See Troubleshooting Section The display flashes Cut out and an incorrect process temperature for the instructions on how to per
86. to invoice Buyer for importation costs of repairs replacement parts when product purchased in one country is submitted for repair in another country Hart s warranty obligation is limited at Hart s option to refund of the purchase price free of charge re pair or replacement of a defective product which is returned to a Hart authorized service center within the warranty period To obtain warranty service contact your nearest Hart authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination to the nearest Hart au thorized service center Hart assumes no risk for damage in transit Following warranty repair the prod uct will be returned to Buyer transportation prepaid FOB Destination If Hart determines that the failure was caused by misuse alteration accident or abnormal condition or operation or handling Hart will provide an estimate or repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCULSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IM PLIED WARRANTY OF MERCHANTABLILTY OR FITNESS FOR A PARTICULAR PURPOSE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSE
87. tout n r eset Set cutout to n degrees c utout n c 500 Temperature Range Reset cutout now c utout r eset c r Read heater power po wer po po 9999 po 1 duty cycle Configuration Menu Probe Menu Read RO calibration parameter 0 r r0 999 999 r0 100 578 Set RO calibration parameter ton r 0 n r 100 324 98 0 to 104 9 Read ALPHA calibration al pha al al 9 9999999 8l 0 0038573 parameter Set ALPHA calibration parameter al pha n al 0 0038433 00370 to ton 00399 Operating Parameters Menu Read cutout mode cm ode cm cm XxXxX cm AUTO Set cutout mode cm ode r eset a uto RESET or AUTO Set cutout to be reset manually cm ode r eset cm r 55 7100 Calibration Bath User s Guide Table 5 Communication Commands continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set cutout to be reset cm ode a uto cm a automatically Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting to n sa mple n sa 0 0 to 4000 seconds Set serial duplex mode du plex f ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to half du plex h alf du h Set serial linefeed mode Iffeed on of f ON or OFF Set serial linefeed mode to on Iffeed on If on Set serial linefeed mode to off Iffee
88. uid by rolling it into place DO NOT attempt to lift the bath DO NOT move a bath filled with fluid BURN HAZARD e Extremely cold temperatures may be present in this equipment Freezer burns and frostbite may result if personnel fail to observe safety precau tions e High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions ELECTRICAL HAZARD e These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged into a 230V AC electric outlet of the appropriate frequency The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordinances Consult a qualified electrician DO NOT use an extension cord or adapter plug e DO use a ground fault interrupt device This instrument contains a fluid A ground fault device is advised in case fluid is present in the electrical system and could cause an electrical shock e Always replace the power cord with an approved cord of the correct rat ing and type If you have questions contact an Authorized Service Center see Section 1 3 e High voltage is used in the operation of this equipment Severe injury or death may result if
89. wer is used for the greatest temperature stability 8 The cooling temperature regulating valve is used to adjust the tempera ture at which the refrigerant evaporates Above 35 C set the coolant pressure about 90 psig Set the cooling temperature valve according to the chart below These settings provide cooling temperatures of 5 C or more below the indicated bath temperature 7 Parts and Controls Back Panel 7 3 9 Desired Bath Temp Expansion Valve Pres Cooling sure Power Switch PSIG Position 90 LOW 82 LOW 74 HIGH 67 HIGH 60 HIGH 53 HIGH 45 HIGH 35 HIGH 28 HIGH HIGH HIGH HIGH HIGH HIGH The cooling temperature pressure gauge is used to indicate the tempera ture at which the refrigerant is evaporating The cooling temperature reg ulating valve is used to adjust this pressure 10 The cascade refrigeration indicator lights show which cooling stages are operating The High Stage is on when the main or high stage refrigera tion is operating The Low Stage light comes on when the refrigeration has been sufficiently cooled by the high stage compressor for the second or low stage compressor to be automatically engaged Back Panel The back panel has the following features see Figure 4 1 the probe connec tor 2 the stirrer power outlet 3 the system fuses 4 the heater power outlet 5 amp 6 optional serial and IEEE interface conn
90. witches and LED dis play the user may monitor the bath temperature set the temperature set point in degrees C or F monitor the heater output power adjust the controller propor tional band set the cut out set point and program the probe calibration param eters operating parameters serial and IEEE 488 interface configuration and controller calibration parameters Operation is summarized in Figure 8 Bath Temperature The digital LED display on the front panel allows direct viewing of the actual bath temperature This temperature value is what is normally shown on the dis play The units C or F of the temperature value are displayed at the right For example Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Reset Cut out If the over temperature cut out has been triggered the temperature display will alternately flash cub oub i Indicates cut out condition The message continues to flash until the temperature is reduced and the cut out is reset The cut out has two modes automatic reset and manual reset The mode de termines how the cut out is reset which allows the bath to heat up again When in automatic mode the cut out resets itself as soon as the temperature is low ered below the cut out set point With manual reset mode the cut out must be reset by the operator after the temperature falls below the set point When t
91. x mode parameter is indicated by 9 Controller Operation IEEE 488 Parameters 9 12 4 9 13 9 13 1 Serial duplex mode parameter Press SET to access the mode setting New duplex mode setting Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables on or disables off transmission of a linefeed character LF ASCII 10 after transmission of any carriage return The linefeed parameter is indicated by IEEE 488 Parameters Baths may optionally be fitted with an IEEE 488 GPIB interface In this case the user may set the interface address within the IEEE 488 parameter menu This menu does not appear on baths not fitted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Press SET to enter the menu IEEE 488 Address The IEEE 488 interface must be configured to use the same address as the ex ternal communicating device The address is indicated by RddrES5 IEEE 488 interface address Press SET to access the address setting 49 7100 Calibration Bath User s Guide 50 9 14 9 14 1 9 14 2 9 14 3 A Current IEEE 488 interface address Adjust the value with UP or DOWN and then use SET to set the address to the displayed value Add 15 i New IEEE 488 interface address Calibration Parameters The operator of the bath controller has access to a number of the bath calibra tio

Access set-point memory

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