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1. 4 5 E DO NOT CHANGE THESE VALUES SEE MANUAL s SET EXIT IFEE 488 Option Installed Ci SET Adj Stir Adj Sample Adj ALPHA Mode Period SET EXIT SET EXIT SET EXIT T g SET EXIT Stir Set point SET Duplex Mode 9 Ci SET E 5 E Adj Stir Set point 1 SET EXIT SET EXIT e Heat Up Powa Linefeed e n 7 SET E E SET Adj Heat Up Power SET EXIT LI Interface Option Installed 4 it 38 Hart Scientific 9 3 9 3 1 6045 6050H 9 Controller Operation The display will indicate the reset function rESEE P Cutout reset function
2. DG BB Unz C i Scale units currently selected Press UP or DOWN to change the units Change units F New units selected 9 Controller Operation Press SET to accept the new selection and resume displaying the bath temperature SET Set the new units and resume temperature display 9 5 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 in the secondary menu is the heater power display See Figure 6 on page 38 9 6 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 allows the user to know the stability of the bath temperature With good control stability the per cent heating power should not fluctuate more than 1 within one minute The heater power display is accessed in the secondary menu Press SET and EXIT
3. Press SET to enter the menu IEEE 488 Address The 488 interface must be configured to use the same address as the ex ternal communicating device The address is indicated by Addr ESS 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 New IEEE 488 interface address Calibration Parameters The operator of the bath controller has access to a number of the bath calibra tion constants namely CTO CG 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 only so that in the event that the controller s memory fails the user may restore these values to the factory settings The user should have a list of these constants and their settings with the manual A Caution 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 9 Controller Operation 9 14 1 9 14 2 The calibration parameters menu is indicated by CAL i Calibration parameters menu Parameter CTO sets the calibration of the over temperature cutout This param eter is not adj
4. Figure 6045 and 6050H Bath Cross Section Optional Cart Shown 6045 6050H 9 3 3 Specifications and Environmental Conditions Specifications and Environmental Conditions 3 1 Specifications 6045 6050H Range 60 C to 400 C 180 C to 550 C Stability 0 002 C at 100 C 5012 oil 0 002 C at 200 C salt 0 005 C at 300 C 5017 oil 0 004 C at 300 C salt 0 004 C at 400 C salt 0 008 C at 550 C salt Uniformity 0 004 C at 300 C 5017 oil 0 005 C at 200 C salt 0 007 C at 400 C salt 0 020 C at 550 C salt Digital display with push button data entry 0 01 high resolution mode 0 00018 C Temperature Setting Set Point Resolution Display Temperature 0 01 C Resolution Digital Setting Accuracy 1 C Digital Setting Repeatability 0 02 C Heaters 350 1000 and 1700 watts 400 1200 2000 Watts Access Opening 5 x 10 127 x 254 mm Depth 12 305 mm Wetted Parts 304 stainless steel Power 115 VAC 10 19 A or 230 VAC 10 10 A 230 VAC 10 50 60 Hz 10 A 2200 W specify 50 60 Hz 2200 W Volume 7 1 gallons 27 liters requires 112 Ib of bath salt Weight 160 Ib 73 kg 180 Ib 82 kg Size 26 5 H x 19 W x 23 D 28 5 H x 20 4 W x 24 5 D 673 x 483 x 584 mm 724 x 518 x 622 mm Interface it software and RS 232 computer interface are available for setting bath temperature via remote com p
5. 29 8 1 10 3 30 8 1 10 4 Silicorie OIL on e UR OE ROC 30 8 1 10 5 Heat Transfer Salt 5 lee 30 8 1 11 Fluid Characteristics Charts 3l 8 1 11 1 Limitations and Disclaimer 31 8 1 11 2 AbouttheGroph 33 34 POWER a een 35 ba eu Cares 35 35 Temperature 36 9 Controller 37 9 1 Bath Temperature 37 92 ee etree 37 9 3 39 9 3 1 Programmable 5 39 93 2 Set point eee RR REX EG TR RR eRe GU 40 9 3 3 Setpoint Vernier s oer RR ee RR Pe E 40 94 Temperature Scale 5 4 95 42 9 6 42 9 7 42 EQ MMC 45 9 9 Controller 46 Ra ede Edna eee eae aes
6. or ws uu o pep 2002 12 19 15 9 SHLV8 WIENS samo pepeiBdn F suci S Bep 2 woun w SNOISIA3H L e v Figure 10 Wiring Diagram 6045 6050H 13 Troubleshooting 76 Hart Scientific
7. SCIENTIFIC Fluke Company 6045 6050H Calibration Bath User s Guide Rev 3A0801 Copyright 1995 All Rights Reserved Hart Scientific 799 E Utah Valley Drive American Fork Utah 84003 9775 Telephone 801 763 1600 e Fax 801 763 1010 Internet http www hartscientific com E mail support hartscientific com Rev 340801 Table of Contents 1 Before You Start cc NI Symbols Used ss hos de 1 1 2 Safety Information 2 IU CPP PIT 2 UAE I PEDI MERE 5 1 3 Hart Scientific Authorized Service Centers 7 2 Introduction 9 3 Specifications and Environmental Conditions 1 32 Environmental 33 ER cbe aedes 12 4 Quick Start ace ok 18 A Unpacking es IT Hoe Rar ae 13 AC CPC 13 43 qa P Eccl SG 14 44 14 5 17 5 1 17 Diysout
8. 21 10 25 C 0 934 25 C 0 43 40 C 0 00032 0 00108 1000 25 C 200 10 5012 3 135 C 0 45 100 25 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 0 00107 1000 25 C 200 20 5013 0 393 100 C 25 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 0 00104 1000 25 C 200 50 5014 25 C 50 150 C Silicone Oil Type 550 70 v 230 C fl cc 232 C 50 70 C 1 07 25 C 0 358 40 C 0 00035 0 00075 100 25 C 5016 300 C fl oc 10 104 C 0 386 100 C 25 1 150 C 0 433 200 Silicone Oil Type 710 80 v 300 C fl oc 302 C 50 80 C 1 11 25 C 0 363 40 0 00035 0 00077 100 25 C 5017 7 204 C 0 454 Q 100 C 25 1 150 C 0 505 200 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 17 Q 5001 6 5 300 C 1 9 300 C 2 4 500 C 17 500 C Limiting Factors b boiling point high evaporation flash point fr freeze point v viscosity Flash point test open cup closed cup Very low water solubility will form as a slush from condensation below freezing Ma cannot be liab
9. Hart Scientific Table 4 Interface Command Summary 10 Digital Communication Interface Command Command Returned Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set point s etpoint 5 set 9999 99 F set 150 00 C Set current set point to n s etpoint n 5 450 Instrument Range Read vernier v ernier 9 99999 0 00000 Set vernier fo 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 u C Set temperature units v 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 ph 999 9 ph 15 9 Set proportional band to n prlop band n pr 8 83 Depends on Configuration Read cutout setting d utout 9999 x c 620 C in Set cutout setting cLutout n r eset Set cutout n degrees dutout n c 500 Temperature Range Reset cutout now dutout r eset I Read heater power po wer po po 9999 po 1 duty cyde Configuration Menu Probe Menu Read RO calibration parameter 1101 r r0 999 999 r0 100 578 Set RO calibration parameter to r 0 n r 100 324 98 0 to 104 9 Read ALPHA calibration al pha al al 9 9999999 al 0 0038573 parameter Set
10. E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk 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 5 12 3436 Telefax 86 10 6 5 12 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office 6045 6050H 7 1 Before You Start Service Center 83 Clemenceau Avenue 15 15 06 Ue Square 239920 SINGAPORE Phone 65 737 2922 Telefax 65 737 5155 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available e Model Number e Serial Number e Voltage Complete description of the problem 8 Hart Scientific 2 Introduction 2 Introduction The Hart Scientific Model 6045 6050H is a constant temperature bath intended mainly for the application of temperature calibration However its high stabil ity and the availability of factory modifications make it suitable for other uses as well CRO CRO 6045 6050H with heat shield
11. SET and release to enter the secondary menu Press SET repeat edly until the display reads ob E This is the menu selection Press UP repeatedly until the serial interface menu is indicated with SErIAL Finally press SET to enter the serial parameter menu In the serial interface parame ters menu are the BAUD rate the sample rate the duplex mode and the line feed parameter BAUD Rate The BAUD rate is the first parameter in the menu The display prompts with the BAUD rate parameter by showing BAU d Press SET to choose to set the BAUD rate The current BAUD rate value is displayed The BAUD rate of the serial interface may be programmed to 300 600 1200 or 2400 BAUD 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 Sample Period The sample period is the next parameter in the menu and prompted with SA f PLE The sample period is the time period in seconds between temperature 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
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13. Calibration Points In calibrating the bath RO 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 useful op erating range of the bath The farther apart the calibration temperatures the larger the calibrated temperature range but the calibration error is also greater over the range For instance if 50 C and 150 C are chosen as the calibration temperatures then the bath may achieve an accuracy of 0 03 C over the range 40 to 160 C Choosing 80 C and 120 C may allow the bath to have a better ac curacy of maybe 0 01 C over the range 75 to 125 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 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 tem perature with the thermometer and compute the temperature error which is the actual bath temperature minus the set point temperature For example if the bath is set for a lower set p
14. simultaneously and release The heater power is displayed as a percent age of full power Access heater power secondary menu 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 9 7 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 tom of the proportional band the heater output is 100 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 4 Hart Scientific 6045 6050H 9 Controller Operation 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 7 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
15. ter strings and are terminated with a carriage return CR ASCII 13 Interface commands are listed below 10 Digital Communication Interface 10 3 Interface Commands The various commands for accessing the bath controller functions via the digi tal interfaces are 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 CR returns the current set point and s 50 00 lt CR gt sets the set point to 50 00 degrees In the table of commands characters or data within brackets and are optional for the command A slash 7 denotes alternate characters or data Numeric data denoted by may be entered in decimal or exponential nota tion Characters are shown in lower case although upper case may be used Spaces may be added within command strings and are ignored Backspace BS ASCII 8 may be used to erase the previous character A terminating CR is im plied with all commands
16. Press SET once more to reset the cutout SET Reset cutout This action also switches the display to the set temperature function To return to displaying the temperature press the EXIT button If the cutout is still in the over temperature fault condition the display continues to flash c ut o ut The bath temperature must drop a few degrees below the cutout set point be fore the cutout 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 first select the set point memory This function is accessed from the temperature display function by pressing SET The num ber of the set point memory currently being used is shown at the left on the dis play followed by the
17. 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 silicone 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 Heat Transfer Salt Heat transfer salt is often used at high bath temperatures Salt has a very high upper temperature limit and a wide useful temperature range New bath salt melts around 145 C however its viscosity is such that its functional range is from around 180 C up to the upper limit of the bath The melting temperature will change as the salt ages or becomes contaminated When the bath is not in use we recommend keeping the temperature above 230 C to prevent excessive amounts of salt from freezing on the stir shaft and other cooler parts of the tank Viscosity is low especially at higher temperatures Salt when melted has very low electrical resistivity Salt may be corrosive to some materials Salt will quickly oxidize the coating on galvanized metal Carbon steel may be used with salt up to 450 C Beyond this temperature stainless steel is recommended A Caution Keep all com
18. 50 60 Hz only electric outlet The power cord of the in strument is equipped with a three pronged grounding plug for your pro tection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be in stalled in accordance with local codes and ordinances Consult a qualified electrician DO NOT use an extension cord or adapter plug DO use a ground fault interrupt device This unit contains a liquid A ground fault device is advised in case liquid is present in the electrical system and could cause an electrical shock Always replace the power cord with an approved cord of the correct rat ing and type If you have questions contact a Hart Scientific Authorized Service Center see Section 1 3 High voltage is used in the operation of this equipment Severe injury or death may result if personnel fail to observe the safety precautions Before Hart Scientific 1 2 2 6045 6050H 1 Before You Start working inside the equipment turn off the power and disconnect the power cord Keep all combustible materials away from the bath when using salt Oper ate the bath on a heatproof surface such as concrete Provide a means of safety for containing any spill which may occur When draining the bath of salt there exists extreme danger of BURNS and FIRE Use proper safety equipment and have fire safety equipment standing by BATH FLUIDS Fluids used in this unit may
19. ALPHA calibration parameter al pha n al 0 0038433 00370 to ton 00399 6045 6050H 5 10 Digital Communication Interface Interface Command Summary continued Command Returned Acceptable Command Description Example Returned Example Values Operating Parameters Menu Read cutout mode cm cm cm AUTO Set cutout mode cm ode r eset a uto RESET or AUTO Set cutout to he reset manually cm r Set cutout to he reset qnaa automatically Read stirrer mode smod smod xxxx smod AUTO Set stirrer mode smod o n aLuto ON or AUTO Set stirrer to on smod o Set stirrer to automatic smod a Read stirrer set point sset sset 999 99 C or F set 150 0 Set stirrer set point sset 450 instrument range Serial Interface Menu Read serial sample setting sa sq 9 sa Set serial sampling setting to 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 f Set serial duplex mode to half du h Set serial linefeed mode ON or OFF Set serial linefeed mode to on Set serial linefeed mode to off If of Calibration Menu Read calibration parameter 0 h0 9 b0 0 Set calibration parameter to n 0 0 999 9 to 999 9 Read CG calibration parameter bg 999 99 hg 156 25 Set CG calibration parameter to g 156 25 999 9 to 999 9 Read low set point limit value il tl 999 tl 80 S
20. Appropriate personal safety protection should be worn by the operator at all times while using the bath DONOT use the instrument for any application other than calibra tion work The instrument was designed for temperature calibration Any other use of the unit may cause unknown hazards to the user DONOT use the unit in environments other than those listed in the user s guide 2 Hart Scientific 6045 6050H 1 Before You Start DO NOT overfill the bath Overflowing extremely hot fluid may be harm ful to the operator See Section 5 3 Bath Preparation and Filling for spe cific 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 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 DO NOT operate high temperature baths 500
21. C near flammable materi als Extreme temperatures could ignite the flammable material 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 The instrument is intended for indoor use only Ensure that you check the appropriate OSHA and local fire code regula tions for proper equipment required to suppress a fire for the fluid utilized in the bath BURN HAZARD e High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions Ensure the bath DOES NOT contain any water and has been completely dried prior to filling with salt or any other fluid Any trapped water can cause a steam explosion resulting in personal injury If the bath has re cently been filled with water ensure the inside of the drain tube is dry prior to filling the bath with salt When immersing any object in the bath ensure that you are not introduc ing anything into the bath that will react with the bath fluid Ensure that probes are DRY and free of contaminants Read the MSDS Material Safety Data Sheet for the salt or bath fluid used If you are still unsure if the material you are going to introduce into the bath will react with the 1 Before You Start fluid refer to the individual MSDS sheets for the three components that make up the salt The bath is
22. PRONG scies dcr gu Oe Ce 18 53 Bath Preparation and 18 COMI KM 19 Did POWE rt Atte Uem qe 19 b ck 222299435 Se eee hse bh dl 61 General 21 6 2 Comparison Calibration 21 6 3 Calibration of Multiple Probes 22 7 5 23 Froni cs 23 7 2 Bath Tank and Lid 73 Back 25 8 General 27 8 1 8 2 8 3 84 8 5 8 6 au eese du Save E Fd REOR TOR 27 8 1 1 _ Temperature Ranges RR A 27 VEZ a 27 81 3 Specific Gentes ea ea 27 814 Thermal Co dudivity SOR eae pe Re e 28 8 1 5 28 8 1 6 Electrical Resistivity ce een eee 28 817 Lifetimes hy 28 28 T URDU 29 8 1 10 Commonly Used Fluids 29 HANE MS geass exes cre 29 8 1 10 2 Ethylene
23. a copy of the most recent Report of Test to restore the test parameters DO NOT operate this instrument in an excessively wet oily dusty or dirty environment 1 Before You Start 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 fluid 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 DO ensure the salt is cleaned from the probes prior to immersing the probe in the next bath Clean your probe between each bath to avoid con tamination between bath fluids Under filling the bath may reduce the bath performance and may possibly damage the bath When calibrating PRTs always follow correct calibration procedure and calibrate from high temperatures to low temperatures with the appropriate triple point of water checks Never immerse a wet or cold PRT into a bath filled with hot fluid Severe damage to the PRT may result as well as per sonal injury to the calibration technician This bath is not designed to be portable Therefore moving the bath once it has been installed should be kept to
24. controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width WNS Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band Figure 7 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 conditions 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 p
25. current set point value 25 06 Bath temperature in degrees Celsius SET Access set point memory 1 25 8 Set point memory 1 25 0 C currently used To change the set point memory press UP or DOWN Increment memory 9 Controller Operation New set point memory 4 40 0 C Press SET to accept the new selection and access the set point value SET Accept selected set point memory 9 3 2 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 c 40 00 Set point 4 value in C If the set point value does not need to be changed press EXIT to resume dis playing the bath temperature Press or DOWN to adjust the set point value Increment display 42 50 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 any changes made to the set point are ignored SET Accept new set point value 9 3 3 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 the temperature to be adjusted below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associ
26. increases Temperature sta bility 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 electri cal conductivity of water may prevent its use in some applications Water used in the bath should be distilled or deionized to prevent mineral deposits Con sider 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 50 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 8 General Operation 8 1 10 3 8 1 10 4 8 1 10 5 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 will expand as temperature increases 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
27. is switched on by the POWER switch on the control panel 7 Parts and Controls 3 The system fuses are internal Never replace a fuse with one of a rating greater than that specified The heater fuses are also internal and protect against shorted heaters 4 The control probe plugs into the bath at the socket on the back of the bath labelled PROBE 5 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 RS 232 6 If the bath is supplied with a GPIB IEEE 488 interface the interface cable is attached to the back of the bath at the connector labelled IEEE 488 7 The drain is used to remove fluid from the bath and must be tightly sealed when the bath is in use Be very careful when draining hot fluid See Section 12 1 Draining the Bath Always use a container of adequate size to hold the entire amount of fluid IEEE 488 Figure 4 Back Panel Features 26 Hart Scientific 8 1 8 1 1 8 1 2 8 1 3 6045 6050H 8 General Operation General Operation Bath Fluid Many fluids will work with 6045 6050H bath Choosing a fluid requires con sideration of many important characteristics of the fluid Among these are tem perature range viscosity specific heat thermal conductivity thermal expansion electrical conductivity fluid lifetime safety and cost Temperature Range One of th
28. or DOWN and then use SET to set the sample rate to the dis played value Duplex Mode The next parameter is the duplex mode indicated with d U P L The duplex mode may be set to half duplex HA LF 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 8 n or disables 0 F F transmission of 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 Hart Scientific 10 1 3 10 2 10 2 1 10 2 1 1 10 2 2 6045 6050H 10 Digital Communication Interface LE 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 Section 10 3 All commands are ASCII charac te
29. 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 unit 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 unit operation Ensure that the soft cutout is adjusted to the fluid characteristics of the ap plication Failing to set the cutout to the limits of the bath fluid can result in fire hazards and personal injury A Cautions Always operate this instrument at room temperature between 41 F and 104 F 5 C to 40 C Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument DO NOT overfill the bath Overflowing liquid may damage the electrical system Be sure to allow for thermal expansion of the fluid as the bath temperature increases See Section 5 3 Bath Preparation and Filling for specific instructions Read Section 6 Bath Use before placing the unit into service 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 unit Only authorized personnel should perform the Factory Reset Sequence if no other action is successful in correcting a malfunction You must have
30. red 46 RO RR o alle ee gl PER 46 9102 5 2 qe tent ies 46 9 11 Operating Parameters 46 Reset ero eR AER eco OU x DER een 47 9 112 Stir Mode Selil imeem ere Mert Seeger 47 Sn 48 Heat 48 9 12 Serial Interface 5 49 9121 BAUD ROG sea ah ae 49 122 Sample Period re e 49 3123 Duplek Modiss isses mE ands haba b bau 50 9124 Lineteed sds wos deter ay Sethe em E s Rho 50 9 13 IEEE 488 5 9 13 1 e et eu 5 9 14 Calibration 5 5 0 he deh rate ae 52 9 142 Q and O doe a DSL EP ere 52 VALID MPH 53 10 Digital Communication 55 10 1 Serial 5 55 10151 WANG i cr ck ee Ice 55 105152 SOU tease rien d Stace 55 101721 BAUDRE 55 59 teg ee Ee tI me 56 10
31. the bath Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing Remove excess hot fluid if necessary with caution Use caution to prevent bath fluid from spilling on the stir motor while filling If you are using heat transfer salt you must follow a special procedure in filling and heating the bath because the salt is solid at lower temperatures See Section 8 1 10 5 Disconnect power to the stirrer if at any time the material in the bath is solid and prevents the stirrer from turning Hart Scientific 5 4 5 5 6045 6050H 5 Installation A Caution Under filling may reduce the bath performance and may possibly damage the bath Probe Inspect the bath controller probe see Figure 3 on page 24 It should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it contains a precision platinum sensor and is mechanically shock sensitive Dropping striking or other physical shock may cause a shift in resis tance in the probe resulting in diminished bath accuracy If damaged the probe can be replaced Contact the factory for assistance Insert the probe into the inch probe hole at the top left side 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 labeled PROBE Power With the bath power switch off see Figure 2 on page 23 plug the bath int
32. the bath will oscillate causing poor stability In this case increase the width of the proportional band If the proportional band setting is too wide the long term stability of the bath is affected In this case decrease the width of the band Refer to Sec tion 10 7 Bath fluid is too thick Make sure that the bath fluid used is less than 50 centiStokes 10 is ideal at the temperature at which the bath is controlling Check the fluid manufacturer s specifications You should also change the bath fluid regularly and if it changes colors or becomes too thick Defective control probe Check that the control probe has not been struck bent or damaged Refer to the previous solution for how to check the prohe s resistance The controller alter nately heats for a while then cools Wrong proportional band setting If the proportional band is set too narrow the bath will oscillate between too much heating and too much cool ing causing instability Increase the width of the proportional band until the temperature stabilizes Refer to Section 10 7 13 Troubleshooting 13 2 13 2 1 13 2 2 Comments EMC Directive Hart Scientific s equipment has been tested to meet the European Electromag netic Compatibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested Low Voltage Directive Safety In order to comply with the
33. 23 Bath and Lid 24 Back Ponel te PONS oe GR on 26 Chart of Various Bath Fluids and Their 33 Controller Operation 38 Bath Temperature Fluctuations at Various Proportional Band Settings 43 Serial Communications Cable Wiring 55 Calibration Example 65 Wiring 34 Aon 75 Tables Table 1 Table 2 Table 3 Table 4 Table 4 Table 4 Table 6 International Electrical Symbols eee 1 Table of Various Bath Fluids and Their 32 Proportional Band Fluid 44 Interface Command Summary 59 Interface Command Summary 60 Interface Command Summary 61 Power Control Commands 62 1 1 6045 6050H 1 Before You Start 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 International Electrical Symbols Symbol Description No AC Alternating Current La ACDC Battery O gt Oi eo CE Complies with European
34. 522 Sample Period si agani HERE SERERE RS ES 56 1012 3 Duplex E REN 56 1002A 56 10 53 Serial 22 HEP 57 10 2 IEEE 488 Communication optional 57 10 2 er Re D 5 57 10 2 1 1 IEEE 488 Interface 4065 57 102 2 IEEEA8B RR Ones eos 5 10 3 Interface 58 10 4 Power Control Functions 6 11 Calibration 08 1 oer sn ave oe oe OE HER xS 63 11 2 Measuring the Set point Error 63 11 3 Computing RO and ALPHA 64 11 4 Calibration Example KEES Oe SE ae 64 12 Maintenance 07 12 1 Draining the Bath 68 Troubleshooting oo o o o mms 7 13 1 71 13 2 13 2 1 EMC Directive 13 2 2 Low Voltage Directive Safety 13 3 Wiring Diagram Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 6045 and 6050 Bath Cross Section Optional Shown 9 Front Panel SAS oe Sr hA RS
35. An access hole cover is recommended to cover the large square access opening in the top of the bath This improves bath temperature stability pre vents excess fluid evaporation or fumes and increases safety with hot fluid The user may drill or cut holes in the cover to accommodate the instruments to be calibrated or immersed in the bath Spare covers are available from Hart Scientific 6 The drain tube located at the lower left corner of the bath is provided to drain fluids from the bath A Caution Extreme care must be used in draining the bath Fluids can be dangerously hot Use a container capable of containing the full volume of oil or salt in the bath Insulate the container from surrounding area as necessary Drain fluids at as low a temperature as practical Back Panel The back panel of the bath contains the following features see Figure 4 on page 26 1 the bath power cord 2 the stirring motor power socket 3 the heater fuse 4 the probe socket 5 the RS 232 interface connector optional 6 the IEEE 488 interface connector optional 7 the cooling tubes and 8 the drain pipe 1 The bath power cord extends from the back of the bath It provides power for the bath temperature controller the heaters and the stirring motor The cord is plugged into an AC mains socket of 230VAC 10 10 A 50 60 Hz 2 The stirring motor power cord plugs into the socket labelled STIRRER Power to the stirring motor
36. European Low Voltage Directive 73 23 EEC Hart Scientific equipment has been designed to meet the IEC 1010 1 EN 61010 1 and the IEC 1010 2 010 EN 61010 2 010 standards Hart Scientific 13 Troubleshootin Wiring Diagram 13 3 L ui v E ee al 21095 100000 eor v as HOLS uomisod z esI SIUL 6 W uonisod SISIUL 8 H V8 HOSO9 0S09 S709 _ ruu 0091 69 108 0078 ueououry ise3 661 L pue ees 9r sz oF VN 0509 1210940 0 0 02 02 9709 Goya angay du buos wasis wasis jeje POW 10S 97 OVA OEZ OVA SH 27 y 53504 worn feci vi om ur 11160000 Yed 195 H oH araram ov fio de Buen ur 005
37. The bath be gins heating or cooling to the new set point SET Store new set point access vernier Hart Scientific 6045 6050H 4 Quick Start The bath will heat or cool until it reaches the new set point temperature Set the heater switch to position MED or HIGH to allow the bath to more quickly reach a higher temperature The higher heater settings may be necessary to reach and control at higher temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cutout should be correctly set for added safety See Section 9 8 To obtain optimum control stability adjust the proportional band as discussed in Section 9 7 5 5 1 6045 6050H 5 Installation Installation A Caution READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty This bath is not designed to be portable Therefore moving the bath once it has been installed should be kept to a minimum A Warning Never move a bath that is full of hot fluid This action could be extremely dangerous and could result in personal injury to the person moving the bath If the bath is going to be placed in an area where it may need to be moved fre quently Hart Scientific sells a special cart designed to accommodate the bath Thus making the bath much more portable However even with a cart the bath s
38. Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information off On 1 Before You Start Symbol Description Canadian Standards Association c 05 OVERVOLTAGE Installation CATEGORY Pollution Degree 2 per IECTOTO 1 refers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATE GORY is energy consuming equipment to be supplied from the fixed installation Exam ples include household office and laboratory appliances C TIC Australian EMC Mark CAT I 1 2 Safety Information A DISCLAIMER Hart Scientific manufactures baths for the purpose of tem perature calibration Baths used for applications other than calibration are used at the discretion and sole responsibility of the customer Hart Sci entific cannot accept any responsibility for the use of baths for any appli cation other than temperature calibration 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 e Warning identifies conditions and actions that may pose hazards to the user e 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 e
39. a heat cold resistant surface or rack until they are at room temperature It is advisable 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 Modify the access cover to accept probes for calibration The bath should be covered at all times Allowing the access cover to be open during the calibration process reduces the stability and accuracy of the test and increases the outgassing of the fluid which can cause safety concerns for attending personnel Comparison Calibration Comparison calibration involves testing a probe unit under test UUT against reference probe After inserting the probes to be calibrated into the bath al 6 Bath Use 6 3 low sufficient time for the probes to settle and the temperat
40. a minimum NEVER MOVE A BATH THAT IS FULL OF HOT FLUID This action could be ex tremely dangerous and could result in personal injury to the person mov ing the bath If the bath is going to be placed in an area where it may need to be moved frequently Hart Scientific sells a special cart designed to ac commodate the bath However even with a cart the bath should not be moved full of hot fluid The fluid can splash causing injury or if the bath and cart tip the hot fluid could cause damage to the surrounding area and personnel If the bath must be moved be sure to drain the fluid to prevent any injury To safely move the bath two people are required One person should lift the bath by the tower while the second person lifts from underneath the bath tank The control probe must be inserted through the lid into the bath fluid and plugged into the socket at the back of the bath DO NOT operate the bath without the control probe properly inserted and attached The bath will not operate correctly without the control probe Injury to operating per sonnel and permanent damage to the bath could occur Hart Scientific 1 Before You Start 1 3 Hart Scientific Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Hart Scientific Inc 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010
41. alled 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 parameters and settings discussed in Section9 with the exception of the BAUD rate setting Wiring RS 232 Cable Wiring for The serial communications ca IBM PC and Compatibles ble attaches to the bath through the DB 9 connector on the back Instrument Computer DTE panel Figure 8 shows the Connector Connector pin out of this connector and 1 suggested cable wiring To 2RxD 2 RxD eliminate noise the serial cable Mig e 1 should be shielded with low re 5 GND 590 sistance between the connector DB 9 and the shield 8 805 9NC ONC Setup Before operation the serial in prod terface of the bath must first be DB 9 Pin DB 25 Pin set up by programming the n NT BAUD rate and other configura o 4 3RxD tion parameters These parame 1 JE 86D 5 015 ters are programmed within the 6 NC E 6 DSR 7 RIS 76 serial interface menu The serial eas 5500 interface parameters menu is INC e L e 20DTR Figure 8 Serial Communications Cable Wiring 10 Digital Communication Interface 10 1 2 1 10 1 2 2 10 1 2 3 10 1 2 4 outlined in Figure 6 on page 38 To enter the serial parameter programming mode first press EXIT while pressing
42. ange of temperatures 2 The control probe provides the temperature feedback signal to the controller allowing the controller to maintain a constant temperature The control probe is Figure 3 Bath and Lid Components Optional Bath gt Fluid Level Hart Scientific 7 3 6045 6050H 7 Parts and Controls a precision platinum resistance thermometer PRT The control probe is deli cate and must be handled carefully The probe is placed in the small hole in the top of the bath so that the probe tip is fully immersed in the bath fluid The probe cable connects to the bath at the probe connector on the back panel 3 The stirring motor is mounted on the bath tank lid It drives the stirring pro peller to provide mixing of the bath fluid Proper mixing of the fluid is impor tant for good constant temperature stability The stirring motor power cord plugs into the back of the bath at the power socket labelled STIRRER 4 On the bath lid is a large rectangular access hole and a small circular access hole These holes are used for filling and emptying the bath with fluids and placement of thermometers and devices into the bath When possible the access holes should be covered 5
43. ated 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 Current vernier value C To adjust the vernier press UP or DOWN Unlike most functions the ver 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 40 Hart Scientific 9 4 6045 6050H 9 Controller Operation Increment display 0 00090 i New vernier setting treet eet rere titres 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 The units are used in displaying the bath tem perature set point vernier proportional band and cutout 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 Bath temperature SET Access set point memory 1 25 0 Set point memory SET Access set point value
44. ath and the solid salt The Heat Up Power feature prevents the heaters from overheating by limiting the power When the Heat Up Power is set to Low the heaters operate at 25 power until the temperature reaches 200 C and is completely melted While the solid salt is being heated the control LED flashes The heater switch setting should be set to HIGH enabling all the heaters to provide adequate power to melt the salt and to melt it as quickly as possible Once the temperature ex ceeds 200 C the heaters operate at full power again and the control LED glows red constantly until the set point temperature is reached If oil or other liquid that does not freeze is being used in the bath the Heat Up Power can be set to High The Heat Up Power always defaults to Low when the bath is switched on The heat up power option is indicated by HERE UP i Heat up power option prend 48 Hart Scientific 9 12 9 12 1 9 12 2 6045 6050H 9 Controller Operation Press UP or DOWN to change the option and then press SET to store the setting Note When using salt as the fluid be sure to always set this option to LO to maximize the lifetime of the heaters Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SErIRL Serial RS 232 interface parameters menu The Serial interface parameters menu contains parameters which determine the operation o
45. bustible materials away from the bath when using salt Operate the bath on a heat proof surface such as concrete Provide a means of safely containing any spills which may occur The greatest safety concern with liquid salt is with its high temperature The fluid provides a source of heat which can ignite or destruct materials Espe cially dangerous are spills since the hot fluid is difficult to contain Salt may also cause steam explosions if it comes into contact with water or other volitile fluids Using salt requires special caution Read carefully the information and Hart Scientific 8 1 11 8 1 11 1 6045 6050H 8 General Operation safety data sheets provided with the salt Use of a fume hood is recommended to remove any products of decomposition or oxidation Because salt is solid at room temperature special procedures are required in us ing the bath with salt Before filling the bath with solid salt disconnect the stir ring motor to prevent it from being damaged See Section 9 11 2 Stir Mode Select A Caution Never allow the stir motor to run with solid material in the bath Restraining the motor from turning may over heat and damage the motor Use HIGH heat with solid salt A Fast Start Heater Model 2024 may be used to aid in the melting of solid salt See Section 9 11 2 Stir Mode Se lect on page 47 Solid salt has poor thermal conductivity The 6050H bath uses a special soft start program to prevent the heater
46. der this warranty is limited to repair or replacement of a product which is returned to Hart within the warranty period and is determined upon examination by Hart to be defective If Hart determines that the defect or malfunction has been caused by misuse alteration abuse or abnormal condi tions or operation or handling Hart will repair the product and bill the pur chaser for the reasonable cost of repair To exercise this warranty the purchaser must forward the product after calling or writing Hart for authorization Hart assumes NO risk for in transit damage For service or assistance please contact the manufacturer Hart Scientific Inc 799 East Utah Valley Drive American Fork UT 84003 9775 Phone 801 763 1600Fax 801 763 1010 E mail support hartscientific com THE FOREGOING WARRANTY IS PURCHASER S SOLE AND EXCLU SIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EX PRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR USE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAM AGES OR LOSS WHETHER IN CONTRACT TORT OR OTHERWISE Hart Scientific 4 4 1 4 2 6045 6050H 4 Quick Start 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 warranty This section gives a brief summary of the steps required
47. e 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 cutout 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 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
48. e temperature range 8 1 6 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 8 1 7 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 8 1 8 Safety When choosing a fluid always consider the safety issues associated Obviously where there are extreme temperatures there can be danger to personnel 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 vapors are produced A Warning Fluids at high temperatures May pose danger from BURNS FIRE and TOXIC FUMES Use appropriate caution and safety equip ment 28 Hart Scientific 8 1 9 8 1 10 8 1 10 1 8 1 10 2 6045 6050H 8 General Operation 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 i
49. eater does not operate If the display flashes CUToUT alternately with the correct process tempera ture check the following Wrong cutout setting The cutout disconnects power the heaters when the bath temperature exceeds the cutout set point This causes the bath tem perature 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 tempera ture is reduced and the operator manually resets the cutout Refer to Sec tion 10 8 Check that the cutout set point is adjusted to 10 or 20 C the desired maximum bath operating temperature and that the cutout mode is set as desired Continuous cutout 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 reset the cutout circuitry may be faulty Try performing the Factory Reset Sequence explained below Factory Reset Sequence Hold the SET and EXIT keys down at the same time while powering up the unit The display shows init the model number and the firmware version Each of the controller parameters and calibration constants must be re programmed The values can be found on the Report of Calibration that was shipped with the instrument The display flashes CUTOUT alternately with an incorrect process t
50. ed in a manner not in accordance with the equip ment design the operation of the bath may be impaired or safety hazards may arise The over temperature cutout should be checked every 6 months to see that it is working properly In order to check the user selected cutout follow the controller directions Section9 8 for setting the cutout Both the man ual and the auto reset option of the cutout should be checked Set the bath temperature higher than the cutout Check to see if the display flashes cut out and the temperature is decreasing Note When checking the over temperature cutout be sure that the temperature limits of the bath fluid are not exceeded Exceeding the temperature limits of the bath fluid could cause harm to the operator lab and instrument The constant temperature bath depends upon the certain qualities of the fluid medium in order to maintain a uniform and stable temperature envi ronment Some oils change their characteristics or become dirty after a period of use Always remove any foreign materials from the bath Silicone oils as well as others may evaporate off their lighter components over a period of time leaving the very viscous components remaining In addition some decomposition will occur which may impair the tempera ture stability of the bath When this happens the fluid is generally very dark to black and viscous Vegetable oils will polymerize turn plastic like after they have been used for a time at hig
51. emperature Low battery A problem could exist with the memory back up battery If the battery voltage is insufficient to maintain the memory data may be come scrambled causing problems A nearby large static discharge may also affect data in memory Access the battery by removing the L shaped panel covering the display electronics Corrupt controller memory If the problem reoccurs affer the battery is replaced initialize the memory by performing a Factory Reset Sequence described in a previous solution The controller displays the wrong temperature and the bath continually heats or cools regardless of the set point value Defective control probe The bath control probe may be disconnected burned out or shorted Check first that the probe is connected properly to the socket in the rear of the bath labeled PROBE 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 The resistance should read from 100 to 300 ohms between pins 1 and 4 depending on its current temperature Corrupt controller memory Initialize the memory by performing Fac tory Reset Sequence described in a previous solution Hart Scientific 6045 6050H 13 Troubleshooting Problem Causes and Solutions The controller controls or attempts to contro
52. en in automatic mode the cutout resets itself as soon as the temperature is lowered below the cutout set point With manual reset mode the cutout must be reset by the operator after the temperature falls below the set point When the cutout is active and the cutout mode is set to manual reset the display flashes cutout until the user resets the cutout To access the reset cut out function press the SET button SET Access cutout reset function 9 Controller Operation Display Secondary Functions Temperature gt set EXIT Display Power ST Y Cutout Active I Set Proportion EXIT Select Setpoint Y SET Set Cutout Y SET Adjust Setpoint I SET Y Adjust Vernier EXIT I SET Y Set Scale C F Configuration Menu A EXIT Operating IEEE 488 poe Parameters Interface Interface lenu Menu Menu SET SET SET set X 5 Device SET Cutout Ro Reset Mode Address SET EXIT SET SET SET Adj Cutout Adjust Adj Device Aj RO Reset Mode BAUD Rate dress I I I SET EXIT SET EXIT SET EXIT SET EXIT Stir Mode Select SET EXIT SET
53. equipment use proper equipment and have fire safety equipment standing by When emptying the salt from the bath it must be in a molten state The salt melts near 150 C In order to prevent the salt from freezing in the drain tube it must be drained at a little higher temperature typically near 200 300 Appropriate safety equipment must used when draining the salt Since the salt must be removed at high temperatures obvious burn and fire dan gers exist Use a face shield high temperature gloves and body protec tion Protect the facility by draining only in fire safe areas If a spill occurs have fire safety equipment standing by Once the flow of salt has started there is no way to stop it The tank should be thermally insu lated from the floor or other surrounding equipment Set up splash guards to protect against hot splashing salt When emptying the bath of liquid salt a portion of the salt may have so lidified in the drain tube To melt the salt plug and clear the drain care fully apply a flame or torch to the drain tube until the molten salt starts to flow into the container This takes some time as the solid plug must get to approximately 150 C in order to melt When the draining is complete wait until the salt is solidified and cool before attempting to remove it 13 13 1 6045 6050H 13 Troubleshooting Troubleshooting In the event the bath appears to function abnormally this section may help to f
54. es can be designed by the metrologist The object 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 Placing 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 Hart Scientific 7 Parts and Controls 7 Parts and Controls 7 1 Front Panel The following controls and indicators are present on the controller front panel see Figure 2 below 1 the digital LED display 2 the control buttons 3 the bath on off power switch 4 the control indicator light and 5 the heater power switch 1 The digital display is an important part of the temperature controller It dis plays 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 se
55. ess the cutout set point se EXIT Access heater power in secondary menu 2102 i Cutout set point To change the cutout set point press UP or DOWN com Decrement display 95C j New cutout set point To accept the new cutout set point press SET 9 Controller Operation Accept cutout set point The next function is the configuration menu Press EXIT to resume display ing the bath temperature 9 9 Controller Configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via the front panel These are ac cessed from the secondary menu after the cutout 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 9 10 Probe Parameters The probe parameter menu is indicated by Pr bE 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 Section 1 The probe parameters are accessed by press
56. et low set point limit to n il 80 999 9 to 999 9 Read high set point limit value th th 999 th 205 Hart Scientific 10 Digital Communication Interface Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set high set point limit to n thLigh 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 fn fl f1 9 Set heater fnz1 0 1 0 off 0 or 1 1 or 2 Set heater to off fn 0 f1 0 Set heater to on fn 1 1 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 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 6045 6050H Power Control Functions The digital interface is capable of controlling the heating 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 the front panel controls are dis abled by switching the heater switch to LOW Otherwise the interface would not be able
57. f 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 de termines the serial communications transmission rate The BAUD rate parameter is indicated by BAUG Serial BAUD rate parameter Press SET to choose to set the BAUD rate The current BAUD rate value is displayed i200 b 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 op eration 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 9 Controller Operation every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by SAMPLE Serial sample period parameter Press SET to choose to set the sample period The current sample period value will be displayed 5 i C
58. generally used when salt is used for the bath medium For example you can set the mode to auto and the temperature to 200 C This allows the stir motor to shut off and turn on only when the salt is a liquid gt 200 C preventing the stir motor from overheat ing and or being damaged The parameter is indicated by To change the setting to always on press the UP or DOWN buttons and then SET When set to St 0 N the stir motor comes on with the bath power regardless of the temperature set in the stir set point parameter 9 Controller Operation 9 11 3 Stir Set point The stir set point allows setting of the temperature above which the stir motor activates when the stir activation is set to automatic To access the paramter press SET from the stir activation parameter Set point mode selection parameter is indicated by Str SEE Stir motor activation set point parameter Press UP or DOWN to change the value and then SET to enter the new value 9 11 4 Heat Up Power The Heat Up Power or soft start feature allows heat transfer salt to be melted in the bath without overheating the heaters When salt solidifies it shrinks leav ing gaps between the solid salt and the sides of the bath Applying full power to the heaters while the salt is solid can cause the heaters to overheat since there is poor heat conduction between the walls of the b
59. h temperatures making them very difficult to remove When the oil has become unusable it should be changed The instructions for removing the oil is as follows Draining the Bath The drain is located on the back of the bath See Figure 4 on page 26 Locate the drain plug on the end of the drain tube This drain plug is to be fluid tight until the time of draining The following information is helpful in draining the Hart Scientific 6045 6050H 12 Maintenance bath Always use a container capable of holding the entire load of fluid Using an adequate size about 8 gallons or cubic foot heat proof fluid container is extremely important Use safety equipment as appropriate 1 Water and low viscosity fluids Drain at room temperature Normal care must be taken for fluids that may have corrosive or damaging effects on the surrounding facility or equipment 2 High viscosity oils The fluid should be sufficiently low in viscosity to drain efficiently Some oils such as 710 silicone oil may need to be heated to 80 C to be fluid enough to drain well The viscosity affects how rapidly it drains as well as how well it flows off of the walls Heat proof contain ers and appropriate safety equipment such as face shields gloves and body covering are recommended 3 Hart Salt Extreme care must be taken in draining the salt from the bath Always use the appropriate safety equipment A Warning Extreme danger of BURNS and FIRE Use safety
60. heater with a second mechanical relay anytime the bath temperature is more than a certain amount above the set point temperature As a second protection device the controller is also equipped with a separate thermocouple temperature monitoring circuit which will shut off the heater if the temperature exceeds the cutout set point The controller allows the operator to set the bath temperature with high resolu tion set the cutout 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 an RS 232 serial or IEEE 488 GPIB digital interface see Figure 4 on page 26 for remote operation Operation of the controller us ing the front control panel is discussed in Section 9 Operation using the digital interfaces is discussed in Section 10 When the controller is set to a new set point the bath will heat or cool 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 overshoot or undershoot of about 0 5 C Hart Scientific 9 1 9 2 6045 6050H 9 Controller Operation Controller Operation This chapter di
61. hould not be moved full of hot fluid The fluid can splash causing injury or if the bath and cart tip the hot fluid could cause damage to the surrounding area and to personnel If the bath must be moved be sure to drain the fluid to prevent any injury To safely move the bath two people are required One person should lift the bath by the tower while the second person slides their hands underneath the bath tank and lifts the bath Bath Environment A Caution DO NOT place under a cabinet or other structure Allow for overhead clearance The Model 6045 6050 6050H Bath is a precision instrument which should be located in an appropriate environment The location should be free of drafts extreme temperatures and temperature changes dirt etc The surface where the bath is placed must be level Because the bath is designed for operation at high temperatures keep all flam mable and meltable materials away from the bath Although the bath is well in sulated top surfaces do become hot Beware of the danger of accidental fluid spills We recommend placing the bath on a heat proof surface such as concrete with plenty of clear space around the bath If the bath is operated at high temperatures a fume hood should be used to re move any vapors given off by hot bath fluid 5 Installation 5 2 5 3 Dry out Period A Warning Before initial use after transport and any time the instrument has not been energized f
62. il salt or dust Use a paint safe cleaning agent on all painted surfaces Solvents such as Trichloroethylene or Acetone may dull or dissolve the paint The stainless steel surfaces may be cleaned with solvents as necessary to re move oils or salt The stirring motor should be clean to allow proper cooling Normally only the outside surfaces will require any attention If the inside of the motor has become heavily loaded with oily dust blow it out with com pressed air Follow normal safety procedures when using pressurized gas ses 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 two weeks for the first year and regularly thereafter This fluid check provides a baseline for knowledge of bath operation with clean usable fluid Once some flu ids have become compromised the break down can occur rapidly Partic ular a
63. ind and solve the problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please read this sec tion carefully and attempt to understand and solve the problem If the bath seems faulty or the problem cannot otherwise be solved then contact Hart Sci entific Customer Service for assistance Opening the unit without contacting Hart Scientific Customer Service may void the warranty Troubleshooting Problem Causes and Solutions The heater indicator LED If the display does not show cutout and shows the correct bath tempera stays red but the tem consider the following possibilities perature does not Insufficient heating Insufficient heating may be caused by the heater increase power setting being too low especially at higher operating temperatures Switching to the higher heater power switch setting if available may solve the problem No heating This is caused by blown heater fuses and or burned out heat ers Check the heater fuses to make sure that they are still good Access the heater fuses by removing the L shaped panel covering the display electron ics If they are blown and continue to blow when replaced the heaters may be shorted If you suspect that the heaters are shorted or burned out con tact Hart Customer Service for assistance 13 Troubleshooting Problem Causes and Solutions The controller display flashes CUToUT and the h
64. ing 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 causes the parameter to be skipped ignoring any changes that may have been made 9 10 1 RO This probe parameter refers to the resistance of the control probe at 0 C Normally this is set for 100 000 ohms 9 10 2 ALPHA This probe parameter refers to the average sensitivity of the probe between 0 and 100 C Normally this is set for 0 00385 C 9 11 Operating Parameters The operating parameters menu is indicated by 46 Hart Scientific 9 11 1 9 11 2 6045 6050H 9 Controller Operation PAr Operating parameters menu Press UP to enter the menu The operating parameters menu contains the cut out reset mode parameter the stirrer mode select and stirrer set point Cutout Reset Mode The cutout reset mode determines whether the cutout resets automatically when the bath temperature drops to a safe value or must be manually reset by the operator The parameter is indicated by Cutout reset mode parameter Press SET to access the parameter setting Normally the cutout is set for au tomatic mode Stir Mode Select This parameter along with the Stir set point allows the user to set the tempera ture at which the stir motor is activated This setting is
65. ither the open or closed cup flash point 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 be 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 im practicality at a higher temperature 8 2 Stirring 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 When the material in the bath is solid such as salt it is very important that the stirrer power be disconnected until the fluid melts Otherwise the stirrer will likely over heat and be damaged A very viscous fluid may stir better with a single 3 inch stirrer than several 2 inch stirrers Try the 3 inch blade provided if the fluid near the walls seems stagnant Replace the 2 inch propellers provided with the 3 inch propeller mounted at the bottom of the stir shaft 34 Hart Scientific 8 3 8 4 8 5 6045 6050H 8 General Operation Power Power to the bath is provided by an AC mains supply See Section 3 1 Specifi cations for power details See Figure 4 on page 26 Power to
66. l at an inaccurate temperature If the controller appears to operate normally except that the bath s temper ature does not agree with the temperature measured by the user s refer ence thermometer to within the specified accuracy consider the following Erroneous parameters Check that the calibration parameters are all cor rect according the Report of Calibration If not reprogram the constants If the controller does not keep the correct parameters the memory backup battery may be weak causing errors in data See Low Battery in a previ ous solution Poor uniformity There may be an actual difference between the bath s control probe and the reference thermometer due to excess gradients in the bath Check that the bath has an adequate amount of fluid in the tank and that the stirrer is operating properly Also check that the reference ther mometer and control probe are both fully inserted into the bath to minimize temperature gradient errors Defective control probe Check that the control probe has not been struck bent or damaged Refer to the previous solution for how to check the prohe s resistance The controller shows that it is controlling at the proper temperature but the bath tempera ture is unstable If the bath does not achieve the expected degree of temperature stability when measured using a thermometer consider the following Wrong proportional band setting If the proportional band is set too narrow
67. le for the suitability of application or for any personal injury damage to equipment 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 be useful with your bath Hart Scientific 8 General Operation 400 C 500 C 600 C 100 0 100 C 200 C 300 C 307 CUR FL 280 C gu Silicone Oil 5013 FL 232 C CR FL211 C Silicone Oil 5010 FL 133 C HFE 7500 5023 EP 100 C Halocarbon 5019 FL 177 C Mineral Oil 5011 Water Methanol FR Pure FL 12 C Ethanol FL 16 C EN BP ool itl wn 5020 106 Dynalene As FL 60 C Bath Salt 5001 Legend Shaded area represents usable range of fluid starting at 50 centistokes Lighter shading represents decreasing viscosity while vaporization and decomposition increase Black area represents liquid range with excessive viscosity Range over which a fume hood is recommended Figure 5 Chart of Various Bath Fluids and Their Characteristics 8 1 11 2 About the Graph Decomposition Starts BP Boiling Point CS Centistokes EP Evaporation Point fluid loss due to evaporation FL Flash Point FR Freeze Poin
68. led 4 Quick Start 4 3 4 4 Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability See Section 3 1 Specifications for power details 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 Setting the Temperature In the following discussion and throughout this manual a button icon around the word SET UP EXIT or DOWN indicates the panel button while the dotted box indicates the display reading see Figure 2 on page 23 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 will show the set point memory that is cur rently being used and its value Eight set point memories are available SET Access set point selection 1 25 8 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 25 00 Current value of set point 1 25 00 C Press SET to accept the new value and display the vernier value
69. 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 to a small degree also affects the control stability It also affects the heat ing and cooling rates Generally a lower specific heat means quicker heating 8 General Operation and cooling The proportional band may require adjustment depending on the specific heat of the fluid 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 8 1 5 Thermal Expansion Thermal 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 Most fluids typically have significant thermal expansion especially when operated over a wid
70. ng 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 75 and 125 C and it is desired to calibrate the bath as accurately as possible for operation within this range The current val ues for RO and ALPHA are 100 000 and 0 0038500 respectively The calibra tion points are chosen to be 80 00 and 120 00 C The measured bath temperatures are 79 843 and 119 914 C respectively Refer to Figure 9 for ap plying equations to the example data and computing the new probe constants Hart Scientific 11 Calibration Procedure RO 100 000 ALPHA 0 0038500 tj 80 00 C measured t 79 843 C 120 00 C measured t 119 914 C Compute errors err 79 843 80 00 C 0 157 C erry 119 914 120 00 0 086 C Compute Ro _ 70 086 x 80 0 0157 120 0 1 RO 0 00385 1 100 000 2100115 120 0 80 0 Compute ALPHA Figure 9 Calibration Example 6045 6050H 6045 6050H 12 Maintenance Maintenance The calibration instrument has been designed with the utmost care Ease of operation 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 The bath should be cleaned regularly to prevent a buildup of o
71. o an AC mains outlet of the appropriate voltage frequency and current capacity See Section 3 1 Specifications for power details Be sure the stirring motor power cord is plugged into the STIRRER socket at the back of the bath see Figure 4 on page 26 6 6 1 6 2 6045 6050H 6 Bath Use Bath Use A Caution Read 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 Refer to General Operation section 8 for information specific to fluid selection and to the MSDS Material Safety Data Sheet specific to the fluid selected Generally baths are set to one tem perature 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
72. oint 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 9 Controller Operation tional band settings for optimum performance with a variety of fluids at se lected temperatures Table 3 Proportional Band Fluid Table Fluid Temperature Proportional Band Stability Water 30 0 C 0 04 C 0 001 C Water 60 0 C 0 04 C 0 001 C Eth Gly 50 35 0 C 0 05 C 0 001 C Eth Gly 50 60 0 C 0 05 C 0 001 C Eth Gly 50 100 0 C 0 4 C 0 007 C Oil 35 0 C 0 1 C 0 003 C Oil 60 0 C 0 2 C 0 003 C Oil 100 C 0 2 C 0 003 C Salt 500 C 0 47 C 0 005 C 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 C EXIT Access heater power in secondary menu pP To change the proportional band press UP or DOWN Decrement display To accept new setting and access the cutout set point press SET Pressing EXIT exits to the secondary menu ignoring any changes just made to the pro portional band value SET Accept the new proportional band setting Hart Scientific 9 8 6045 6050H 9 Controller Operation Cutout As a protection against software or hardware fault shorted heate
73. oint of t 50 C and the bath reaches a measured temperature of 49 7 C then the error is 0 3 Next set the bath for the upper set point ty and after stabilizing measure the bath temperature and compute the error erry For example suppose the bath was set for 150 C and the thermometer measured 150 1 C giving an error of 0 1 11 Calibration Procedure 11 3 11 4 Computing RO and ALPHA Before computing the new values for RO and ALPHA the current values must be known The values may be found by either accessing the probe calibration 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 RO and ALPHA are computed by entering the old values for RO and ALPHA the calibration temperature set points and and the temperature errors err and erry into the following equations Rh 1 Apna 1 R fy 1 ALPHA Jerr ALPHA t erry ty ALPHA ALPHA For example if RO and ALPHA were previously set for 100 000 and 0 0038500 respectively and the data for t and erry were as given above the new values RO and ALPHA would be computed as 100 193 and 0 0038272 respec tively Program the new values RO and ALPHA into the controller Check the calibration by setting the temperature to t and t and measuri
74. or more than 10 days the bath will need to be en ergized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety requirements 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 applying power such as storage in a low humidity tem perature chamber operating at 50 C for 4 hours or more Bath Preparation and Filling The Model 6045 6050H Bath is not provided with a fluid Various fluids are available from Hart Scientific and other sources Depending on the desired tem perature range any of the following fluids as well as others may be used in the bath e Water e Ethylene glycol water e Mineral oil e Silicone oil e Heat transfer salt 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 Before filling the bath make sure the drain is well plugged see Figure 3 and Figure 4 on pages 24 and 26 Fill the bath with clean unpolluted fluid Fill the bath carefully through the large square access hole to a level that will allow for stirring and thermal expansion Under filling may reduce bath performance and may possibly damage the bath heater The fluid should never exceed a height of 1 2 below the top of the tank See Figure 3 on page 60 for reference to the fluid level with regards to the top of the tank and the lid of
75. provided with an access cover The access cover can be modi fied to allow the probes being calibrated to be inserted through the access cover The bath should be operated with the access cover on at all times Operating the bath without the access cover reduces stability increases out gassing of fluids and increases the possibility of personal injury or fire hazard When removing probes from the bath DO NOT wipe probes down with a paper towel If the bath setpoint is high the salt can cause the paper towel to ignite in your hand Provide a safe surface and situation for the probes to cool prior to cleaning the salt from the probes The bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot when removed from the bath Cautiously handle probes to prevent personal injury Carefully place probes on a heat resistant surface or rack until they are at room temperature Be extremely careful when filling the bath with salt and bringing it up to temperature Salt expands with temperature It is easy to add salt but ex tremely dangerous to remove hot molten salt because the bath is over filled DO NOT fill the bath above the indicated fill line when the stirring is on It will overflow 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 230 VAC
76. r or user er ror the bath is equipped with an adjustable heater cutout 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 cutout 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 the bath If the cutout is activated because of excessive bath temperature then power to the heater shuts off and the bath cools The bath cools until it reaches a few de grees below the cutout set point temperature At this point the action of the cut out is determined by the setting of the cutout mode parameter The cutout has two modes automatic reset or manual reset If the mode is set to automatic the cutout automatically resets itself when the bath temperature falls below the reset temperature allowing the bath to heat up again If the mode is set to man ual the heater remains disabled until the user manually resets the cutout The cutout 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 acc
77. r strings terminated with a carriage return character CR ASCII 13 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 simultaneously 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 Gb E This is the menu selection Press UP repeatedly until the IEBE 488 interface menu is indicated with E E E Press SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter 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 IEEE 488 Operation 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
78. rticular properties Your company s safety policies as well as per sonal judgment regarding flash points toxicity etc must also be considered You are responsible for reading the Material Safety Data Sheets and making a judgment here Cost may require some compromises as well Hart Scientific 8 General Operation Table 2 Table of Various Bath Fluids and Their Characteristics Fluid Lower Upper Thermal Thermal Hart Part Temperature Temperature Flash Viscosity Specific Specific Heat Conductivity Expansion Resistivity No Limit Limit Point centistokes Gravity cal g Q cl s an CO m c m C 100 Halocarbon 0 8 1009C v 70 e NONE 570 5000 1 71 40 0 2 0 0004 0 0011 5019 0 8 40 C 0 5 Q 70 C Methanol 96 C fr 10C 17C 120 596 000000 06 0 0005 20 0 0014 25 C 0 66 0 07920 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 Q 75 C Ethylene 90 C b NONE 700 1 05 0001 Glycol 50 5020 2 50 C 07 100 C Mineral Oil No 7 10 C v 166 C fl 168 C 159 75 0 87 25 C 0 48 25 C 0 00025 0 0007 50 5 25 C 5011 5 125 C 0 84 75 C 0 53 75 C 25 C 0 81 125 0 57 125 C Silicone Oil Type 40 v 130 C fl 133 C 5 25 C 0 92 25 C 0 4 0 00028 0 00105 1000 25 C 200 05 5010 25 C 10 150 C Silicone Oil Type 30 C v 209 C fl
79. s from being overheated until the salt is completely molten This program controls the heater duty cycle at 25 until the bath temperature reaches 200 C To allow the bath to control below 200 C the soft start feature must be deactivated see Section 9 11 2 Stir Mode Select on page 47 Section 9 11 3 Stir Set point on page 48 and Section 9 11 4 Heat Up Power on page 48 Salt is supplied in a pink granular form Fill the bath gradually as the salt heats and melts Because of the heat required to melt the salt this is a slow process and may take 10 hours or more Fill the bath until the liquid is a few inches be low the lid The level will rise as much as two inches as it is heated to the upper temperature limit Fluid Characteristics Charts Table 2 and Figure 5 have been created to provide help in selecting a heat ex change fluid media for your constant temperature bath The charts provide both a visual and numerical representation of most of the physical qualities impor tant in making a selection The list is not all inclusive many usable 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 serviceability Sources of information sometimes vary for pa
80. s 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 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 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 The useful temperature range of water however is fairly limited from a few degrees above 0 C to a few degrees below 100 C Evaporation increases dramatically as temperature
81. scusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key switches 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 cutout set point and program the probe calibration parame ters operating parameters serial and IEEE 488 interface configuration and controller calibration parameters Operation is summarized in the flowchart in Figure 6 Please refer to Figure 2 on page 23 for the operation examples in the following sections 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 5 00 Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Reset Cutout If the over temperature cutout has been triggered the temperature display alter nately flashes Cub oub Indicates cutout condition The message continues to flash until the temperature is reduced and the cutout is reset The cutout has two modes automatic reset and manual reset The mode de termines how the cutout is reset which allows the bath to heat up again Wh
82. so may present danger of the bath overheating and causing damage or fire To adjust press SET to show the current value of H Use the UP and DOWN keys until the value matches the factory settings listed above Press SET to store the value The display now shows Press SET to show the current value of L Use the UP and DOWN keys until the value matches the factory settings listed above Press SET to store the value The display now shows Press EXIT to return to displaying the temperature 10 10 1 10 1 1 10 1 2 6045 6050H 10 Digital Communication Interface Digital Communication Interface If supplied with the option the 6045 6050 6050H bath is capable of communi cating with and being controlled by other equipment through the digital inter face 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 may be controlled To enable the digital interface to control the heater the HEATER switch must be set to the LOW position Serial Communications The bath may be inst
83. t PP Pour Point 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 6045 6050H 33 8 General Operation 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 This 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 This is the point at which a fume hood is recommended This point is very subjective in nature and is impacted by individual tolerance to dif ferent 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 is located and others We assume the bath is well covered at this point This is also sub ject to company policy Flash Point Point at which ignition may occur See flash point discussion in Section 8 1 8 The point shown may be e
84. t 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 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 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 indica tor lets the user visually see the ratio of heating to cooling When the indicator is red the heater is on and when it is green the heater is off and the bath is cooling z DOWN UP EXIT SET High Precision Bath Figure 2 Front Panel Features 6045 6050H 23 7 Parts and Controls 5 The heater power switch is used to select the appropriate heater power lev els for heating and controlling temperatures 7 2 Bath Tank and Lid The bath tank and lid assembly includes see Figure 3 on page 24 1 the tank 2 the control probe 3 the stirring motor 4 the access holes 5 the access hole cover and 6 the drain tube 1 The bath tank is constructed of stainless steel It is very resistant to oxida tion in the presence of most chemicals and over a wide r
85. temperatures The LOW setting is used for heating solid salt controlling at lower temperatures and for scanning at slower rates When con trolling at the MED or HIGH heater power settings instead of LOW the proportional band may need to be increased typically two or four times to compensate for the increase in power gain Otherwise the temperature may oscillate Fluid Drain The drain at the back of the bath see Figure 4 on page 26 may be used to re move fluid from the bath During operation of the bath the drain plug must be screwed on tightly See Section 12 1 on page 68 8 General Operation 8 6 Temperature Controller The bath temperature is controlled by Hart Scientific s unique hybrid digi tal analog temperature controller see Figure 2 on page 23 The controller of fers the tight control stability of an analog temperature controller as well as the flexibility and programmability 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 mi cro controller will automatically turn off the
86. 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 by periodically switching the heater on for a certain amount of time using a solid state relay The front panel red green control indicator see Figure 2 on page 23 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 will pulse constantly when the bath is maintaining a stable temperature The heater has three power level settings The MED and HIGH heater power settings are used to more quickly heat the bath fluid up to the desired op erating temperature These heater power settings may also be required for con trol at higher
87. to set up and operate the 6045 6050H 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 through8 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 Bath e Access Hole Cover Controller Probe e Manual e Report of Test If you are missing any item please call Hart Scientific Customer Service at 1 801 763 1600 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 Section 5 for detailed instructions for proper installation of the bath Be sure to place the bath in a safe clean and level location Remember that the bath operates at very high temperatures Fill the bath tank with an appropriate liquid For operation at low bath tempera tures clean distilled water works well Carefully pour the fluid into the bath tank through the large rectangular access hole above the tank avoiding spilling any fluid The fluid must not exceed a height of 1 2 inch below the bath lid The control probe must be inserted through the lid into the bath and plugged into the socket at the back of the bath DO NOT operate the bath without the control probe properly instal
88. to switch the heater functions off The 6045 6050 6050H baths have two control functions with the digital interface These control functions are for heaters settings Med and High To control the heaters with the digital interface the front panel heater switch must be set to LOW The heater function is controlled with the F1 and F2 commands These commands are either set to O or 1 according to Ta ble on page 62 The default settings are 1 0 and 2 0 which is LOW Sending a command without a parameter returns the state 1 for on or 0 for off 10 Digital Communication Interface Table 6 Power Control Commands Power 6045 50 6050H Fl F2 360 W 400 W 0 0 1100 W 1200 W 0 1800 W 2000 W X 1 Hart Scientific 11 1 11 2 6045 6050H 11 Calibration Procedure 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 RO 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
89. ttention should be paid to the viscosity of the fluid A significant change in the viscosity can indicate that the fluid is contaminated being used outside of its temperature limits contains ice particles or is close to a chemical breakdown Once data has been gathered a specific mainte nance schedule can be outline for the instrument Refer to the General Operation section Section8 for more information about the different types of fluids used in calibration baths Silicon oils require this type of maintenance Salt does not require as much maintenance as silicon oil There is very lit tle evaporation with salt Periodic fluid level checks are sufficient 12 Maintenance 12 1 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 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 Hart Scientific Customer Service for more information Before using any cleaning or decontamination method except those rec ommended by Hart users should check with Hart Scientific Customer Service to be sure that the proposed method will not damage the equip ment If the instrument is us
90. ure 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 the same time However stem effect from different types of probes is not to 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 dur ing 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 prob
91. urrent sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value 5 50 New sample period 9 12 3 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 plex mode parameter is indicated by dUPL Serial duplex mode parameter 9 12 4 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 50 Hart Scientific 9 13 9 13 1 9 14 6045 6050H 9 Controller Operation The mode may be changed using UP or DOWN and pressing SET LF OFF New linefeed setting 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
92. usted through software It is adjusted with an internal potentiome ter The following values are set by the factory 6045 415 5 6050 515 5 6050H 565 C 5 CO and CG These parameters calibrate the accuracy of the bath set point They are pro grammed at the factory when the bath is calibrated and the values are entered onto the Report of Test Note Do not alter the value of these parameters If improved bath accuracy is needed calibrate RO and ALPHA according to the procedure given in Section 11 To restore these values press SET to display Press SET to show the current value of CO Use the UP and DOWN keys until the value displayed matches the CO value on the Report of Calibration Press SET to store the value The display now shows RERBA Press SET to show the current value of Cg Use the UP and DOWN keys until the value displayed matches the Cg value on the Report of Calibration Press SET to store the value The display now shows Hart Scientific 9 14 3 6045 6050H 9 Controller Operation H and L These parameters set the high and low set point limits of the bath These pa rameters are factory set to the following 6045 High 400 C 0 Low 0 C 0 C 6050 High 500 C 0 Low 0 C 0 6050H High 550 C 0 Low 0 C 0 C Note DO NOT change the values of these parameters from the factory set val ues To do
93. uter For IEEE 488 add the 2001 IEEE to the automation package Automation Package 3 2 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 ambient relative humidity 15 50 e pressure 75kPa 106kPa 6045 6050H 3 Specifications and Environmental Conditions 3 3 mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized e altitude less than 2 000 meters e indoor use only Warranty Hart Scientific Inc Hart warrants this product to be free from defects in ma terial and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment This warranty extends only to the original purchaser and shall not apply to any product which in Hart s sole opinion has been subject to misuse alteration abuse or abnormal conditions of operation or handling Software is warranted to operate in accordance with its programmed instruc tions on appropriate Hart products It is not warranted to be error free Hart s obligation un

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