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6055 Users Guide 5A1102.vp

1. E 1 ils Secondary Functions emperature p SET EXIT EE SET Y io A A EXIT Display Power H EXIT Reset Cutout SET Y Cutout Active SET EXIT set Proportional Band p a exl I Y SET 4 EXIT Select Setpoint Y SET EXIT Set Temp Y SET a EXIT Adjust Setpoint SET Y e EXIT Adjust Vernier EXIT SET Y C H EXIT Set Scale C F Configuration Menu SET SET EXIT EXIT EXIT uj EXIT EXIT E LI 1 I LI LIY H operating L T UP IEEE 488 ur n 4 DOWN Parameters lt DOWN l Interface DOWN Interface lt Dow Calibration lt Menu Menu a Ko SET SET SET SET a SET X 5 Y Y Y ol Y 2 Y Cutout 1 BAUD in Device i RO Reset Mode i Rate M Address 7 g cTo SET EXIT SET EXIT gt SET EXIT i SET EXIT gt iau SET EXIT v Us 1 Adj Cutout Adjust s od Adj Device i 1 Reset Mode i i Address a i i MD i i I SET EXIT SET EXIT i SET EXIT oy SET EXIT E SET EXIT pon a Stirrer Sample id 1 gt ALPHA Mode Select i Period pou IEEE 488
2. loi _ RO E L In ALPHA I 1 ALPHA t err 1 ALPHA t Jerry ALPHA ALPHA ly f If for example RO and ALPHA were previously set for 100 000 and 0 0038500 respectively and the data for tj ty err and erry were as given above then the new values RO and ALPHA would be computed as 100 193 and 0 0038272 re spectively Program the new values RO and ALPHA into the controller Check the calibration by setting the temperature to tj and ty and measuring the errors again If desired the calibration procedure may be repeated again to further im prove the accuracy Calibration example The bath is to be used between 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 10 Calibration procedure Calibration example Ry 100 000 ALPHA 0 0038500 tj 80 00 C measured t 79 843 C ty 120 00 C measured t 119 914 C Compute errors err 79 843 80 00 C 0 157 C erry 119 914 120 00 C 0 086 C Compute Ro x 80 0 0 157 x 120 0 Re 0 00385 1 100 000 100 115 120 0 80 0
3. Wiring The serial communications cable attaches to the bath through the DB 9 connec tor on the back panel Figure 8 shows the pin out of this connector and sug gested cable wiring To eliminate noise the serial ca ble should be shielded with RS 232 Cable Wiring for low resistance between the IBM PC and Compatibles connector DB 9 and the shield Instrument Computer DTE Connector Connector Setup DB 9 Pin DB 9 Pin 1NC m 1DCD Before operation the serial 2 RxD a 2 RxD 3TxD A 3TxD interface of the bath must first INC 2 DIR be set up by programming the 5GND 5GND BAUD rate and other configu 6NC 6 E TO A ration parameters These pa A ue rameters are programmed 9NC 9NC within the serial interface menu The serial interface pa rameters menu is outlined in Instrument Computer DTE 1 Connector Connector Figure 6 DB 9 Pin DB 25 Pin To enter the serial parameter 1NC e rogramming mode first press RID Mes progra 8 mo st pre 3TxD e 3 RxD EXIT while pressing SET 4NC e 4RTS and release to enter the sec 3 e MEE 5CTS 6NC 6DSR ondary menu Press SET re 7RTS pos 7GND peatedly until the display 8 CTS 8DCD reads ProbE This is the NG h RODIA menu selection Press UP Figure 8 Serial Cable Wiring Diagram 45 6055 Calibration Bath User s Guide 46 9 1 2 1 9 1 2 2 9 1 2 3 9 1 2 4 9 1 3 repeatedly until the serial interface me
4. 10 Calibration procedure een 53 10 1 Calibration POIS e uc riada X EG ES 53 10 2 Measuring the set point error leen 53 10 3 Computing KO and ALPHA 5 2 sc A aie fi rate 53 10 4 Calibration example iu dox Roo er acera e 54 11 Maintenance s ss eas RO a ee CR ee we eS 57 12 Troubleshooting 2 429999 o 9 ede x R3 RS 59 121 CIRGHDISSEOOUHP lt br a Rok xdg o nom ss E a 59 122 COMES aa r ao Cada xc x we KO Ee EROR IE 3M 61 12 2 1 EMC Directive 3 uoi oe 6464 66 Pmt in yn fi f n dani a 61 12 2 2 Low Voltage Directive Safety 2 2n 61 iii Figures and Tables Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Table 1 Table 1 Table 1 Table 2 Figure 9 Conpollorpanbl s saua mot whee E RR VUE Lm eg dE A 19 Power panel une i us ee 46 4 doe VIA X E cw Y X 20 Back panlo 2393 9 Sess OR eek OS e ee 2 9 21 System diagram uc y Gwe hee AO X99 3 Re wee poe OK ER W kwa 24 System e s n suu ss aR ESOS ETS 533 x38 x95 26 Controller operation flowchart wow wou wonn a w eri n 30 Bath temperature fluctuations at various proportional band settings 35 Serial Cable Wiring Diagram o 45 Interface command summary errors ook ee Rx ox 48 Interface command summary cont Won wou wow vou 08 448 ee ees 49 Interface command summary cont vos 0 4 va ee o9 ea 50 Power Commands o s sosa c x4 OK BSD SH ES Re RS 22 Calibration example g
5. Compute ALPHA 1 0 00385x120 0 0 157 1 0 00385 x 80 0 0 086 m 120 0 80 0 ALPHA 0 00385 0 0038387 Figure 9 Calibration example 55 11 Maintenance 11 Maintenance The calibration instrument has been designed with the utmost care Ease of op eration and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments e A battery is used to maintain operating parameters in the unit All operat ing parameters including calibration parameters should be checked on a regular basis to insure accuracy and proper operation of the instrument See the troubleshooting section for the procedure on checking the status of the battery e The bath should be cleaned regularly to prevent a buildup of salt Use a paint safe cleaning agent on all painted surfaces Solvents such as Trichlo roethylene or Acetone may dull or dissolve the paint The stainless steel surfaces may be cleaned with solvents as necessary to remove oils e The stirring motor should be clean to allow proper cooling Normally only the outside surfaces require any attention If the inside of the motor has become heavily loaded with salt blow it out with compressed air Fol low normal safety procedures when using pressurized gasses e Salt expands and contracts with temper
6. n ee SET EXIT SET EXIT gt l SET EXIT m d Option Installed a ser EXIT 1 e ess ass a es Adj Stirrer A i A i z I SET EXIT SET EXIT i SET EXIT i SETEXIT Stirrer f i o Setpoint i res ji 5 CG SET EXIT SET EXIT i ser EXIT i i 9 Adj Stirrer i I i 1 SET EXIT SET EXIT i SETIEXIT Heatup y Power i Linefeed 1 i SET EXIT 3 f SET EXIT SED EXIT Adj Heatup Adi i just i Linefeed 1 Adjust SET EXIT i SET EXIT SETEXIT Interface L je __ Option Installed SET EXIT gt Adjust L SET EXIT Figure 6 Controller operation flowchart 30 8 Controller operation Temperature set point 8 3 8 3 1 rESEE Cut out reset function Press SET once more to reset the cut out SET Reset cut out This will also switch the display to the set temperature function To return to displaying the temperature press the EXIT button If the cut out is still in the over temperature fault condition the display continues to flash cut out The bath temperature must drop a few degrees below the cut out set point be fore the cut out can be reset Temperature set point The bath temperature can be set to any value within the range as given in the specifications with a high degree of resolution The temperature range of the particular fluid used in the bath must be known by the operator and the bath should only be operated well below the upper temperature limit of t
7. XRETURN no parameter will return f1 1 or f1 0 depend ing on whether heater 1 is on or off respectively Since unlike the front panel heater control which turns on multiple heaters to achieve the desired power level the interface commands control the heaters in dividually multiple commands must be issued to set the desired amount of power Table 2 lists the commands which should be given to set various power 51 6055 Calibration Bath User s Guide 52 9 5 levels Power is variable with the front panel DRIFT control when heater 1 F1 is turned on Table 2 Power Commands POWER F1 F2 F3 F4 F5 OFF 0 0 0 0 0 0 225 W LOW 1 0 0 0 0 225 450 W 1 1 0 0 0 MEDIUM 450 675 W 1 1 1 0 0 MEDIUM HIGH 675 900 W HIGH 1 1 1 1 0 1800 W BOOST 1 1 1 1 1 Heater settings for control Suggested heater control settings for various ranges are suggested below Range Controls 150 C 250 C LOW Heater 1 on heaters 2 4 and boost heater off 250 C 350 C MEDIUM Heaters 1 and 2 on heater 3 4 and boost heater off 350 C 450 C MEDIUM HIGH Heaters 1 3 on and heater 4 and boost heater off 450 C 550 C HIGH Heaters 1 4 and boost heater on 10 Calibration procedure Calibration points 10 10 1 10 2 10 3 Calibration procedure In some instances the user may want to calibrate the bath to improve the tem perature set point accuracy Calibration is done by adju
8. at 40 C e pressure 75kPa 106kPa 11 6055 Calibration Bath User s Guide e mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized e altitude less than 2000 meters 12 4 Installation Unpacking 4 4 1 Installation CAUTION READ SECTION 5 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the war ranty This section provides the steps required to set up and operate the 6055 bath This section should be used as a general overview and reference and not as a substitute for the remainder of the manual Please read Sections5 through7 carefully before operating the bath WARNING Never move a bath that is full of hot fluid This action is extremely dangerous and can result in personal injury and possible dam age to the surrounding area The bath comes on a cart This cart is for ease of operation but in no way im plies that the bath is portable This bath is extremely dangerous when filled with salt Follow the safety guidelines set forth in the Before you start section The bath should never be picked up with liquid salt in the tank If the bath needs to be picked up allow the salt to solidify and cool Four people are needed to safely lift the bath Lift the bath where the bath and the cart meet CAUTION Use caution as this bath is top heavy Unpacking Unpack the bath carefully and inspect it for any damag
9. 200 C e Turn the heater to the maximum position of 4 and turn on the boost heater e The controller will limit the duty cycle of the heaters to 25 until the salt reaches about 200 C e As the heat expands the solid salt you will hear some cracking noises which should not cause concern e When the stirrer cut in temperature is reached the stirrer will turn on and begin to pump the molten salt into the test well e If the thermometer holding fixture was removed previously it may be re placed at this time e The bath is now ready for operation 27 6055 Calibration Bath User s Guide 28 7 6 7 17 Stirring Stirring of the bath salt is very important for stable temperature control The salt must be mixed well for good temperature uniformity and fast controller re sponse The stirrer is precisely adjusted for optimum performance Power Power to the bath is provided by an AC mains supply as specified in the speci fications Power to the bath passes through a filter to prevent switching spikes from being transmitted to other equipment To turn on the bath switch the control panel power switch to the ON position The stir motor will turn on the LED display will begin to show the bath tem perature 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 num
10. OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 11 99 Table of Contents 1 Before YOU Start a n wow w w w on ak m ee yo Rs 1 LI SUMISO tp ye yi vox ee e eee eee RUE edem oe 8 xD RO ox 1 L2 Safety Information e s gt so s sadete awm aaa d e aa 2 1 2 1 Warnings saltos ay gap be acd a RARA Bae ep EA 2 1 2 2 euni RT e die e re a na ea E AS dan S Met as eta f MA T 5 1 3 Authorized Servico Centers w os sses n w sik Rx x XS 6 2 InirodUCHOH 4 240 s e eee aa f de eee a e DE RON 9 3 Specifications and environmental conditions 11 34 Specifications s Aa a vn ox we eee Vna e XC eR deg a 11 3 2 Environmental conditions 4 w 2 we k
11. Press SET to access the parameter setting Normally the cut out is set for manual mode Stir mode select This parameter along with the Stirrer Set point allows the user to set the tem perature at which the stirrer motor is activated This setting is 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 stirrer motor to shut off and turn on only when the salt is a liquid 2200 C preventing the stirrer motor from overheating and damage The parameter is indicated by 8 Controller operation 8 11 3 8 11 4 Operating parameters Str Ack Stirrer mode selection parameter Press SET to access the parameter setting Gtr Aukto Stirrer is set for automatic activation at the stirrer set point temperature To change the setting to always on press the UP or DOWN buttons and then SET When set to Str 0 n the stirrer motor comes on with the bath power regardless of the temperature set in the stirrer set point parameter Stir set point Allows setting of the temperature above which the stirrer motor will activate when the stirrer activation is set to automatic To access the paramter press SET from the stirrer activation parameter Set point mode selection parameter is indicated by Laxsssssanssaunasssaussuauusssamasad Press UP or DOWN to change the value and then SET to enter the new v
12. a ON or AUTO Set stirrer activation smod 0 smod 0 mode to on Set stirrer activation smod a smode a mode to auto Read Stirrer Set Point sset sset sset 9999 99 C or F sset 160 00C Set Stirrer Set Point to n sset n sset 160 instrument range Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting ton sa mple n sa 0 0 to 4000 seconds Set serial duplex mode du plex f ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to half du plex h alf du h Set serial linefeed mode If eed on of f ON or OFF Set serial linefeed mode to on If eed on If on Set serial linefeed mode to off Iffeed of f If of Calibration Menu Read CO calibration parameter cO cO c0 9 c0 0 Set CO calibration parameter to n cO n c0 0 999 9 to 999 9 Read CG calibration parameter cg cg cg 999 99 cg 406 25 Set CG calibration parameterto n cg n cg 406 25 999 9 to 999 9 Read low set point limit value tl ow tl tl 999 tl 80 Set low set point limit to n tllow n tl 80 999 9 to 999 9 Read high set point limit value th igh th th 999 th 205 Set high set point limit to n th igh n th 205 999 9 to 999 9 Miscellaneous not on menus Read firmware version number ver sion ver ver 9999 9 99 ver 2100 3 56 Read structure of all commands h elp h list of commands Read Heater 1 fi fi f1 9 f1 1 Set Heater 1 f1 1 0 1or0 49 6055 Calibra
13. be changed then press EXIT to resume dis playing the bath temperature To adjust the set point value press UP or DOWN Increment display C 42 50 j New set point value When the desired set point value is reached press SET to accept the new value and access the set point vernier If EXIT is pressed instead then any ai made to the set point will be ignored SET Accept new set point value Set point vernier The set point value can be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a more precise bath temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed from the set point by pressing SET The vernier setting is displayed as a 6 digit num ber with five digits after the decimal point This is a temperature offset in de grees of the selected units C or F 0 088808 j Current vernier value in 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 Increment display 0 00090 New vernier setting 8 Controller operation Temperature scale units 8 4 Next press EXIT to
14. bration 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 Appropriate personal safety protection should be worn by the operator at all times while using the bath e Hart Scientific does not recommend that user s drain the salt from the bath Hart Scientific provides the service of draining salt from the bath If draining the bath salt is necessary contact an Authorized Service Center see Section 1 3 for an RMA and instructions on returning the bath In sure that the control probe is removed from the bath before the salt solidi fies Solidification in the bath can take up to several days If the control probe is not removed before shipping the bath the control probe may be damaged during shipping and the Service Centers assume no liability for damage incurred during shipping 1 Before you start Safety information e DO NOT use the instrument for any application other than calibration work The instrument was designed for temperature calibration Any other use of the unit may cause unknown hazards to the user e D
15. case although upper case may be used Spaces may be added within command strings and will simply be ignored Backspace BS ASCII 8 may be used to erase the previous character A terminating CR is implied with all commands Power commands 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 1 switching the heater control to OFF and 2 switching the boost heater switch to OFF Otherwise the interface would not be able to switch these functions off The 6055 bath has five control functions with the digital in terface These are controls for heaters 1 2 3 and 4 each 225 W and the boost heater which is 900 W Heater 1 power could be varied with the DRIFT control on the front panel The boost heater should only be used for quickly heating the bath up to a high temperature and not for controlling at a constant temperature Serial commands FI through F5 control the heaters 1 through 4 and the boost heater individually These commands are used to turn the heaters on or off or to read the states of the heaters Sending a command with parameter 1 turns the heater on Parameter 0 turns the heater off No parameter returns the state 1 for on or 0 for off For example F1 1 lt RETURN gt turns on heater 1 FI
16. 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 will be used in displaying the bath temperature set point vernier proportional band and cut out set point The temperature scale units selection is accessed after the vernier adjustment function by pressing SET From the temperature display function access the units selection by pressing SET 4 times P5 00 C Bath temperature SET Access set point memory l 25 0 Set point memory SET Access set point value Mg E i Scale units currently selected Press UP or DOWN to change the units Change units Un F i New units selected Press SET to accept the new selection and resume displaying the bath temperature SET Set the new units and resume temperature display 33 6055 Calibration Bath User s Guide 34 8 5 8 6 8 7 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 Heater power The temperature controller controls the temperature of the bath by pulsing the heater on and off The total po
17. 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 probes can be designed The ob ject is to keep the reference probe and the probe s to be calibrated as closely grouped as possible in the working area of the bath Bath stability is maximized when the bath working area is kept covered In preparing to use the bath for calibration start by e Placing the reference probe in the bath working area e 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 t
18. 2 connector and 8 optional IEEE 488 GPIB connector 1 The probe connector on the back panel is used for the temperature con troller probe 2 The stirrer power connection provides ac power to the stirring motor and cooling fan 3 The system fuses are internal one fuse for each leg of the ac mains power Only replace fuses with those of the same rating and type 4 The power cord 5 The heater power outlet supplies power to the control and boost heaters that are attached to the top plate of the bath tank The connector allows the assembly to be easily removed if required 6 The serial number is located at the top right corner of the back panel When consulting with an Authorized Service Center refer to the serial number 7 Optional DB 9 connector for interfacing the instrument to a computer or terminal with a serial RS 232 cable 8 Optional GPIB connector for interfacing the instrument to a computer or terminal using IEEE 488 communications 7 General operation Two modes of temperature control 7 1 7 1 1 7 1 2 General operation The components features and operational theory of the Model 6055 calibration bath are described in this section The Model 6055 calibration bath is shown in block diagram form in Figure 4 on page 24 This diagram illustrates the primary features of the bath system and their function which are described as follows Two modes of temperature control There are two modes of tempe
19. 55 Calibration Bath User s Guide e Before using any cleaning or decontamination method except those rec ommended by Hart users should check with an Authorized Service Cen ter to be sure that the proposed method will not damage the equipment If the instrument is used in a manner not in accordance with the equip ment design the operation of the bath may be impaired or safety hazards may arise The over temperature cut out should be checked every 6 months to see that it is working properly In order to check the user selected cut out fol low the controller directions Section 8 2 for setting the cut out Both the manual and the auto reset option of the cut out should be checked Set the bath temperature higher than the cut out Check to see if the display flashes cut out and the temperature is decreasing WARNING When checking the over temperature cut out be sure that the temperature limits of the bath fluid are not exceeded Exceeding the tem perature limits of the bath fluid could cause harm to the operator lab and instrument 58 e The constant temperature bath depends upon the certain qualities of the fluid medium in order to maintain a uniform and stable temperature envi ronment 12 Troubleshooting Troubleshooting 12 12 1 Troubleshooting In the event the bath appears to function abnormally this section may help to find and solve the problem Several possible problem conditions are described along wit
20. 55 Calibration Bath is a highly stable constant temperature salt bath It has been designed for calibrating liquid in glass thermometers or other types of long thermometers against a known temperature standard such as a Standard Platinum Resistance Thermometer SPRT The 6055 calibration bath provides the following features e A deep fluid tank test well is 3 88 inches in diameter and has 17 inches of fluid depth e A highly temperature stable low gradient environment typically a nominal stability of 0 005 C with salt The fluid is well stirred and environmen tally protected to minimize gradients e The fluid level is near the top of the test well to facilitate calibration of liquid in glass thermometers without needing to compensate for stem ef fect e The bath provides two calibration modes temperature control mode and temperature drift mode The temperature control mode uses a hybrid digi tal and analog PI controller with lock in amplifier design The temperature and other functions are selected with the four button keypad to a hun dredth of a degree and finer with a digital vernier adjustment The Drift mode bypasses the controller with heater power manually controlled by the variable transformer 3 Specifications and environmental conditions Specifications 3 1 3 2 Specifications and environmental conditions Specifications Range 200 C to 550 C 392 F to 1022 F Stability 0 003 C at 200 C
21. 8 12 2 Sample periode 456 409 bbe bd ee iad baw okenn KO gue RA 41 8 12 3 Duplex mode 4 6 12335534 fab ti e Dok me dd Sind RS 41 8 12 4 Linefeed kriy rit anka Pot f n W den K n in je Pe fe ie as 41 IEEE 458 parameters ks sx f ie e e e ox Roy SSS 42 8 13 1 IEEE 488 addiess 4e den Bd eo A RS we wee es 42 Calibration parameters s s pb e soc X ow we Oe a 42 8 14 1 Jo PC 43 8 14 2 CO and ECG i x or tee ad RERBA EEG orb dur d ee rs 43 8 14 3 Hand E y ye dux w mati d ER RU ond nd I Pu ae eB avit s 43 9 Digital communication interface 45 9 1 Serial communications 4 292 9 3 Y Re 45 9 1 1 WINDS ee Ge at Sap Rd AA dee tds petto a Ap oun 45 AE c C ee a ee ea de ew Bais e at 45 9 1 2 1 Ba diat se esc torterar x Row Be ede oa WOW Ge Uy S go e SHS 46 9 1 22 Sample period sai ss a iusi pani choke Reuse ge m wt og Mowe ens 46 RIZ Duplex MOUCH za aos ara rw REN a S ados odere oC e doa rere Einen 46 9 1 1221 Linefeed s sue ke RR mE F404 exu X mx boe qe queue deque S 46 9 1 3 Serial Operations uo ds ch d Ne ab e e RR RE d 46 9 2 IEEE 488communication optional 47 9 2 1 Setup andaddressselection s cse so ocr roc teccar wet o 47 922 IEBE 488 op ration ecc dap ap died h oS Rowe eh ea dos dI Gas 47 9 3 Interface Commands uoc o o Rok ox dex X0 SER EES 47 9 4 Power Commands av sw ane a m a hom eom He e SH Ho 51 9 5 Heater settings for control lt 3 uoi 9 Take RA 22
22. Band too Narrow Proportional Band too Wide Optimum Proportional Band mung RR ERR n Figure 7 Bath temperature fluctuations at various proportional band settings The proportional band width is easily adjusted from the bath front panel The width may be set to discrete values in degrees C or F depending on the selected units The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the control ler percent output power display Narrow the proportional band width to the point at which the bath temperature begins to oscillate and then increase the band width from this point to 3 or 4 times wider 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 s xr Access heater power in secondary menu le Pct 2 Heater power in percent SET Access proportional band 35 6055 Calibration Bath User s Guide 36 8 8 To change the proportional band press UP or DOWN Decrement display To accept the new setting and access the cut out set point press SET Press ing EXIT will exit the secondary menu ignoring any changes just made to the proportional band value SET Accept the new proportional band setting Cut out As a protection against software or hardware fault shorted heater tr
23. D This in dicator 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 6055 HIGH PRECISION BATH 200 C to 550 C Calibration 0 3 HEATER MODE Figure 1 Controller panel 19 6055 Calibration Bath User s Guide 6 2 Power panel The Power Panel Figure 2 controls include 1 the power switch and indicator 2 the boost heater and indicator 3 the mode select switch and indicators 4 the control heating select switch and 5 the drift adjust control 1 The ON OFF power switch powers up the bath The switch is a DPST type that opens both legs of the ac mains power source A red indicator light shows that power is on 2 The boost heating provides an additional 900 watts for rapidly changing between temperatures The boost heating indicator shows whether the boost heater is on or off The boost heater is powered through the tem perature controller triac to prevent exceeding the desired set temperature The boost heater indicator flashes when the set temperature has been reached as a reminder to turn it off for control 3 The mode select switch selects between the Temperature Control and Temperature Drift modes The indicator light shows which mode is func tioning The Temperature Control position selects the temperature con troller panel In Temperature Drift mode the heater control is via the Dri
24. EEE 488 address The IEEE 488 interface must be configured to use the same address as the ex ternal communicating device The address is indicated by Rdd ee i Current IEEE 488 interface address Adjust the value with UP or DOWN and then use SET to set the address to the displayed value Add 15 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 CO CG H and L These values are set at the fac tory and must not be altered The correct values are important to the accuracy and proper and safe operation of the bath Access to these parameters is avail able to the user 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 8 Controller operation Calibration parameters 8 14 1 8 14 2 8 14 3 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 The calibration parameters menu is indicated by CAL Calibration parameters menu Press SET five times to enter the menu CTO Parameter CTO sets the calibration of the over temperature cut out This is not adjustable by software but is adjusted with an inter
25. O NOT use the unit in environments other than those listed in the user s guide e DO NOT overfill the bath Overflowing extremely hot fluid may be harm ful to the operator See Section 7 5 Filling the bath for specific instruc tions e Follow all safety guidelines listed in the user s manual e Calibration Equipment should only be used by Trained Personnel e If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired e 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 e DO NOT operate high temperature baths 500 C near flammable materi als Extreme temperatures could ignite the flammable material e Overhead clearance is required Do not place the instrument under a cabi net or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes e The instrument is intended for indoor use only e Ensure that you check the appropriate
26. OSHA and local fire code regula tions for proper equipment required to suppress a fire for the Salt 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 e Ensure the bath DOES NOT contain any water and has been completely dried prior to filling with salt Any trapped water can cause a steam explo sion resulting in personal injury If the bath has recently been filled with water ensure the inside of the drain tube is dry prior to filling the bath with salt e When immersing any object in the bath ensure that you are not introduc ing anything into the bath that will react with the bath salt Ensure that probes are DRY and free of contaminants Read the MSDS Material Safety Data Sheet for the salt used If you are still unsure if the material you are going to introduce into the bath will react with the salt refer to 6055 Calibration Bath User s Guide the individual MSDS sheets for the three components that make up the salt The bath is provided with an access cover The cover should remain on the bath whenever possible Operating the bath without the access cover reduces stability increases out gassing of fluids and increases the possi bility 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
27. October 2013 2013 Fluke Corporation All rights reserved Specifications are subject to change without notice All product names are trademarks of their respective companies Calibration 6055 Calibration Bath User s Guide LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price Fluke r
28. ailable 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 and address selection 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 second ary menu Press SET repeatedly until the display reaches Pr bE This is the menu selection Press UP repeatedly until the IEEE 488 interface menu is indicated with IEEE Press SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter 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 ter strings and are terminated with a carriage return CR ASCII 13 Interface commands are listed below Interface commands The va
29. alibration temperatures First set the bath to the lower set point which we will call t Wait for the bath to reach the set point and allow 15 minutes to stabilize at that temperature Check the bath stability with the thermometer When both the bath and the thermometer have stabilized measure the bath temperature with the thermometer and compute the tempera ture error err which is the actual bath temperature minus the set point temper ature If for example the bath is set for a lower set point of tj 50 C and the bath reaches a measured temperature of 49 7 C then the error is 0 3 C Next set the bath for the upper set point ty and after stabilizing measure the bath temperature and compute the error erry For our example we will suppose the bath was set for 150 C and the thermometer measured 150 1 C giving an error of 0 1 C 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 53 6055 Calibration Bath User s Guide 54 10 4 menu from the controller panel or by inquiring through the digital interface The user should keep a record of these values in case they may need to be re stored in the future The new values RO and ALPHA are computed by entering the old values for RO and ALPHA the calibration temperature set points tj and ty and the temperature errors err and erry into the following equations
30. alue NOTE Stir Mode Select defaults to Rut o each time the power of the bath is cycled off and back on Therefore this parameter has to be set each time the bath is powered on if St 0 N is the desired mode of op eration Heat up power NOTE This section applies to controller parameters not to the High Low setting of the front panel heater switch This feature helps lengthen the lifetime of the heaters when using heat transfer salt as the bath fluid The heater power will be limited to less than 30 while the salt is solid at low temperatures to prevent the heaters from overheating Once the temperature reaches 200 C the heaters can then operate at 100 power HEHE UP Heat up power option Press SET to access the parameter value 39 6055 Calibration Bath User s Guide 40 8 12 8 12 1 HU LO Low power heat up mode for heat transfer salt uansssunssssauuusanasssuanssauuussaod HU HI l High power heat up mode 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 optional serial RS 232 interface parameters menu is indicated by SE cIBL Serial RS 232 interface parameters menu The serial interface parameters menu contains parameters which determine the operation of the serial interface These control
31. ature Be sure that the correct amount of salt is used for the temperature If the bath is used at a lower temperature and then raised to a higher temperature some of the molten salt may need to be carefully removed to prevent overflow e 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 e Salt requires little maintenance There is very little evaporation with salt Periodic fluid level checks are usually sufficient e Ifahazardous 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 e Ifthe 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 contact an Authorized Service Center for more information 57 60
32. ber 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 8 Controller operation Bath temperature 8 1 8 2 Controller operation This section discusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key 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 cut out set point and program the probe calibration param eters operating parameters optional serial and IEEE 488 interface configuration and controller calibration parameters Operation of the primary functions is summarized in Figure 6 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 P5 00 C Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Reset cut out If the over temperature cut out has been triggered then the temperature display will alternately flash Cukt out Indicates cut out condition The message conti
33. 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 Sec tion 10 The probe parameters are accessed by pressing SET after the name of the pa rameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After the desired value is reached press SET to set the parameter to the new value Pressing EXIT will cause the parameter to be skipped ignoring any changes that may have been made 37 6055 Calibration Bath User s Guide 8 10 1 RO This probe parameter refers to the resistance of the control probe at 0 C Nor mally this is set for 100 000 ohms 8 10 2 ALPHA 38 8 11 8 11 1 8 11 2 This probe parameter refers to the average sensitivity of the probe between 0 and 100 C Normally this is set for 0 00385 C Operating parameters The operating parameters menu is indicated by PAr Operating parameters menu Press SET to enter the menu The operating parameters menu contains the cut out reset mode parameter Cut out reset mode The cut out reset mode determines whether the cut out resets automatically when the bath temperature drops to a safe value or must be manually reset by the operator The parameter is indicated by Ckar Sk i Cut out reset mode parameter Lassssanssssauuusanasssuanasauuussaod
34. d ee eee kila Ee ee e 11 A Installation lt o ss soe Xo avem k POSE EG A Ye OA wk ka 13 4 1 Unpacking 4 i a cxx 9 x Y ERE as ESS 13 4 2 Comments concerning the use of salt 14 4 3 Balb envirODDNODE s s bue 6 eee bebe wx ded 3 4 EN S 14 4 4 DAOU period 5 uie aee m 6 m te x 4 585 544 4 4444 2 14 4 5 POWEL 2 ets oes phoebe II ca es doe 14 46 Setup kod w ob oe RS AA See eee Bee oes OS 14 4 7 S tting the Tempetdlibe 2 em owe whee ESUe ee de k 15 9 Bath USB 4 w wow aono es He Oo 3093 9 TE ek Ce HS 17 54 General uis areosa Pob ar ses ane ui E ia d Fat ek ide 17 5 2 Comparison calibration aa aie ou ta bee wk es 17 5 3 Calibration of multiple probes 18 6 Parts and controls 4 w 4 0 s oc kas 6 Oe 99 Rw di 19 6 1 Controller panel 4 64 xo AGS a 3 x dra RRS ERE vi 19 02 POwerpanclh v 93 asiron atit 3735 Red oe ad 20 6 3 po A Rm 22 7 General operation 2 2245329 aa fa a di aa k 23 7 1 Two modes of temperature control ice x we baw ees 23 7 1 1 Temperature control mode revenu 23 7 1 2 Temperature drift mode s cc osos o o e 23 12 7 3 7 4 1 3 7 6 Ta Bath fluid 25 Fluid Systemi c s ee fe ia ak dee aed eer Be A e An ew A 25 Fluid Drain o 23 Plina the bathi 20 x 963 379 4 erm EX a 23 7 3 1 Using heat transfer salt len 25 7 5 1 1 The first Salt load adas ui
35. does not agree with the temperature measured by the user s reference ther mometer to within the specified accuracy consider the following Erroneous parameters Check that the calibration parameters are all correct ac cording to the Report of Calibration If not reprogram the constants If the con troller does not keep the correct parameters the memory backup battery may be weak causing errors in data See Low Battery in a previous 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 thermometer and control probe are both fully inserted into the bath to minimize temperature gradi ent 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 probe s resistance The controller shows that it is controlling at the proper temperature but the bath temperature 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 the bath will oscillate causing poor stability In this case increase the width of the proportional band If the prop
36. e a ma de de 25 75 52 Melting the salt ess ae aide sta Se o eG ene o de Sou ee AA 27 SUNE vr 28 POWEL krik ei ake na oe a a ee SE xd ee es ee 28 8 Controller operation 290 8 1 8 2 8 3 8 4 8 5 8 6 8 7 8 8 8 9 8 10 8 11 8 12 8 13 8 14 Bath temperature ae xe ox yox e 8 SHS E C RO OS 29 Reset cutout Ge x fe me ak RUE A amp hee ok YO ORE A E AGS 29 Temperature set point box ee EX xU x ESO A 31 8 3 1 Programmableset points eee 31 8 3 2 Set point Valle i Gaede gad Se ey ik Rma esi b ee Sa meds 32 8 3 3 Setpoint verniet 2x ode eb a 32 Temperature scale MANS w v ue uso radar 33 Secondary Me vues m iu e o boa SG ore eee ee eo Pes 34 Heater DOWBE 24404 09404 g vin e en Ce ea eS oo Oe d 34 Proportional DABU s sae sa ra ESKER ek RES ER SS 34 o PED e is e ew Eee he we wd 36 Controller configuration s ss s a ck pa sa a E EORR nas 37 Probe parameters MDC 37 8 10 1 RO st ot ae eet Sete oe Wy tite Rae Ed eet Se eek Rete co ee f L 38 8 10 2 ALPHA amp ance A A er 38 Operating parameters enreda RU Sm RR 38 8 11 1 Cuto tresetmode nup eo er AAA 38 8 11 2 Stir mode select 2x onn des bie ek Ren RC e uro OR OR eS 38 8 11 3 SUE SEA P ME assu a queo xao bares dee Rx s 39 8 11 4 Heat up DOW E uos eek Uy mm cts Rel hey dentes te es RC e e UE OR 39 Serial interlace parameters uds xov XR Rs 40 8 12 1 Balid rate s s e deuce tied tom X EORR bw bw AU IAN MEE 40
37. e 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 1 3 Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl 1 Before you start Authorized Service Centers 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 Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 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 e Complete description of the problem 2 Introduction Introduction The 60
38. e set to half duplex HALF or full duplex FULL With full duplex any commands received by the bath via the serial interface will be im mediately echoed or transmitted back to the device of origin With half duplex the commands will be executed but not echoed The default setting is full du plex 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 0 n or disables GF F transmission of a linefeed charac ter LF ASCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed using UP or DOWN and pressing SET Serial operation Once the cable has been attached and the interface set up properly the control ler will immediately begin transmitting temperature readings at the pro grammed rate The serial interface operates with 8 data bits 1 stop bit and no parity 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 9 Digital communication interface IEEE 488 communication optional 9 2 9 2 1 9 2 2 9 3 face commands are discussed in Section 9 3 All commands are ASCII charac ter strings terminated with a carriage return character CR ASCII 13 IEEE 488 communication optional The IEEE 488 interface is av
39. e that may have oc curred during shipment If there is shipping damage notify the carrier immediately Verify that the following components are present e 6055 Bath e Control Probe e Power Cord e Immersion Heater e Report of Test e Carousel optional 13 6055 Calibration Bath User s Guide 14 4 2 4 3 4 4 4 5 4 6 Comments concerning the use of salt A CAUTION Do not use the control heaters to melt granular salt when fill ing the bath The control heaters can be damaged if used in such a man ner Use the immersion heater with a power of about 1000 watts to melt the salt Do not turn the POWER on until the tank is 3 4 full of melted salt Bath environment The Model 6055 bath is a precision instrument that must be located in an ap propriate environment The location should be free from drafts extreme tem peratures extreme temperature changes and dirt Use the levelers to ensure that the bath is level Allow free air space around the bath to allow surface heat to convect away freely A fume hood should be used for ventilation of fumes 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 If used at high temperatures a fume hood should be used to remove any vapors given off by hot bath fluid Dry out pe
40. ed 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 6055 Calibration Bath User s Guide 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 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 The fluid can splash causing injury or if the bath tips the hot fluid could cause damage to the surrounding area and personnel If the bath must be moved allow the salt to solidify and cool Care must be used when moving the bath with the fluid solidified in the bath The control probe can easily be damaged Four people are required to safely move the bath 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 th
41. efore transferring it to another fluid Always be sure that the probe is completely dry before in serting it into a hot fluid Some of the high temperature fluids react violently to water or other liquid mediums Be aware that cleaning the probe can be danger ous if the probe has not cooled to room temperature Additionally high temper ature fluids may ignite the paper towels if the probe has not been cooled For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature Comparison calibration Comparison calibration involves testing a probe unit under test UUT against a reference probe After inserting the probes to be calibrated into the bath al low sufficient time for the probes to settle and the temperature of the bath to stabilize One of the significant dividends of using a bath rather than a dry well to cali brate multiple probes is that the probes do not need to be identical in construc tion The fluid in the bath allows different types of probes to be calibrated at 17 6055 Calibration Bath User s Guide 18 5 3 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
42. egrees C per minute over the desired range This allows the control noise to be eliminated although greater skill is required in making calibrations The heater power is adjusted by means of a variable transformer located on the control panel It allows position one of the heater selection switch to be continually variable from 0 to 100 Positions 2 3 4 and Boost add their full value of heat incrementally to the ad justed value of position 1 23 6055 Calibration Bath User s Guide iAINO ASN AHOLOVA HO SI NIVHG DNINHVM NY 9NI10009 YOLVOICNI TOULNOO Nivya YNYL Hive HAINHOASNYHL ANYL dim CLVIASNI SIEVIEWA isnray JOON 1180 NG OO 10 OO d330 41 al VIG 88 ee TAM 1531 MOU TON m SOON TAA LNVISNOO San H ONIY3H Avnasia TLIDIO HATIOHINOO 300 1081NO0 SUN IYYadNaL YIH Sme 18008 HSHULLS m Figure 4 System diagram 24 7 General operation Bath fluid 7 2 7 3 7 4 7 5 7 5 1 7 5 1 1 Bath fluid Heat transfer salt works with the 6055 bath up to 550 C Other fluids SHOULD NOT be used with the 6055 bath Fluid system The fluid system consists of the insulated tank the stirrer assembly the drain the overflow test well and the fluid The heaters and probe which are part of the control system are physically internal to the tank The tank and oth
43. er wetted parts are made of stainless steel The stirrer is at tached to the tank top plate of the bath and its motor receives additional cooling from a fan to keep from overheating and to increase the lifetime at high bath temperatures The stirrer directly drives three 2 inch diameter stirring propel lers The down draft from the propellers forces the fluid through the overflow test well The stirring motor plugs into the rear of the control unit See Figure 5 on page 26 The over flow test well serves to provide a constant depth of fluid at an essen tially constant height near the well opening Variations in fluid volume due to thermal expansion and evaporation do not effect measurements within reason able volume ranges The fluid expelled from the tank is controlled to flow past the control heaters first before entering the main tank for thermal management WARNING The drain is for factory use only Fluid Drain The drain on the bottom of the bath see Figure 4 on page 24 is for factory use only During operation of the bath the drain plug must be screwed on tightly Filling the bath The bath is shipped dry Check inside of the test well for foreign matter and re move it to avoid interference with operation Using heat transfer salt The first salt load Salt comes in small bead or granular form which is initially pink in color Ap proximately 70 pounds are required for the installation The following procedure is required i
44. eserves the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the product s specified rating or normal wear and tear of mechanical components Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS
45. etween 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 7 5 Filling the bath for specific in structions Read Section 5 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 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 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 salt 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 dropp
46. f the bath is empty and will be filled with bead or granular salt 25 6055 Calibration Bath User s Guide Figure 5 System diagram 26 7 General operation Filling the bath 7 5 1 2 e Use an immersion heater with a power of about 1000 watts to melt the salt e Do not use the control heaters to melt the granular salt or they will be damaged e Inspect the drain to be sure it is fully sealed e Insert the immersion heater into the test well and fill the remaining space with the granular salt e As the salt melts it will run into the main tank As this occurs continually fill the test well with more salt A CAUTION Danger of serious burns exists Use extreme care and use ap propriate safety equipment As this process continues and the tank is nearing its full level turn the POWER switch ON and set the temperature to about 200 C with the MODE SELECT switched to TEMPERATURE CONTROL The stirrer will not turn on until the bath has actually reached the cut in temperature of 175 to 225 C The melting point of the salt is about 150 C Increase the temperature of the main tank and add more salt until the salt depth reaches about 3 5 inches from the tank top plate at 250 C without pumping Melting the salt The following process is to be followed to melt salt in a bath which has previ ously had salt installed and has cooled e Turn on the unit and set the temperature to the desired starting point at least
47. for general information only It is not de signed to be the basis for calibration laboratory procedures Each laboratory will need to write their own specific procedures General Be sure to select the correct fluid for the temperature range of the calibration Bath fluids should be selected to operate safely with adequate thermal proper ties to meet the application requirements Also be aware that some fluids ex pand and could overflow the bath if not watched Refer to General Operation Section 7 for information specific to fluid selection and to the MSDS sheet specific to the fluid selected Generally baths are set to one temperature and used to calibrate probes only at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left en ergized reducing the stress on the system The bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from the bath Cautiously handle probes to prevent personal in jury Carefully place probes on a heat cold resistant surface or rack until they are at room temperature It is 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 b
48. ft Adjust control and the heating select switch 4 Thecontrol heating switch selects the control heater power positions off through 4 Select the lowest reasonable value for normal control condi Boost Heating Boost Heating Mode Select Temperature Drift Drift Adjust Indicator 2 Switch 3 Switch Mode Indicator 5 Control BOOST TEMPERATURE DRIFT HEATER DRIFT ADJUST MODE SELECT 50 TEMPERATURE CONTROL OFF PERCENT 12 Power Power 4 Heating Temperature Control Indicator Switch Switch Mode Indicator Figure 2 Power panel 20 6 Parts and controls Power panel Figure 3 Back panel 21 6055 Calibration Bath User s Guide 22 6 3 tions depending on bath temperature The switch simply adds more heat ers into the circuit until the desired power is attained Position 2 is variable using the Drift Adjust control 5 The drift adjust control is a variable transformer that adjusts the position 1 control heater through 0 to 100 of its power range The additional power required for higher temperatures may be added in steps by select ing heating 2 3 4 etc Positions 2 3 4 5 will not achieve the maxi mum possible temperatures Boost 2 is the next increment Boost 2 3 and so on can be used as required Back panel The Back Panel Figure 3 includes 1 the probe connector 2 the stirrer power outlet 4 the power cord 5 the heater power connector 6 the serial number 7 optional RS 23
49. h 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 an Autho rized Service Center for assistance Opening the unit without contacting an Au thorized Service Center may void the warranty Troubleshooting Problem Causes and Solutions The heater indicator LED stays red but the temper ature does not increase If the display does not show cutout and shows the correct bath temperature consider the following possibilities Insufficient heating Insufficient heating may be caused by the heater 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 heaters 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 electronics 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 contact an Authorized Service Center see Section 1 3 for assistance The controller display flashes CUToUT and the heater does not operate If the display flashes CUTOUT alternately with the correct process tempera ture check the foll
50. he front panel LED display normally shows the actual bath temperature 90 00 t i Bath temperature display When SET is pressed the display shows the set point memory that is cur rently being used and its value Eight set point memories are available SET Access set point selection i 150 0 i Ser point 1 150 0 C currently used Increment display C 160 00 New set point value Press SET to accept the new value and display the vernier value The bath be gins heating or cooling to the new set point SET Store new set point access vernier 0 00000 Current vernier value 15 6055 Calibration Bath User s Guide 16 The bath heats or cools until it reaches the new set point temperature Set the heater switch to position HIGH to allow the bath to more quickly reach a higher temperature The HIGH setting may be necessary to reach higher tem peratures and control at high temperatures When setting the set point temperature be careful not to exceed the temperature limit or the bath fluid The over temperature cut out should be correctly set to prevent this from happening See Section 8 8 To obtain optimum control stability adjust the proportional band as discussed in Section 8 7 5 Bath Use General 5 5 1 5 2 Bath Use A CAUTION READ THIS SECTION before placing the bath in service Incorrect handling can damage the bath and void the warranty The information in this section is
51. he 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 temperature To set the bath temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set point memory currently being used is shown at the left on the display followed by the current set point value 26 00 E i Bath temperature in degrees Celsius SET Access set point memory p Beg Set point memory 1 25 0 C currently used To change the set point memory press UP or DOWN Increment memory 4 40 0 New set point memory 4 40 0 C Laxsssssanssaunasssaussuauuussaasad Press SET to accept the new selection and access the set point value 31 6055 Calibration Bath User s Guide 32 8 3 2 8 3 3 SET Accept selected set point memory Set point value The set point value may be adjusted after selecting the set point memory and pressing SET The set point value is displayed with the units C or F at the left c 40 00 j Set point 4 value in C If the set point value need not
52. he probes Using the reference probe as the guide be sure that the temperature has stabilized before starting the calibration 6 Parts and controls Controller panel 6 Parts and controls This section describes the Front Panel the Power Panel and the Back Panel of the 6055 The Front Panel located just left of the bath consists of the Controller Panel Figure 1 and the Power Panel Figure 2 6 1 Controller panel The Controller Panel includes 1 the digital LED display 2 the control buttons and 3 the control indicator light 1 The digital LED display is an important part of the temperature control ler because it not only displays set and actual temperatures but also dis plays various controller functions settings and constants The display shows temperatures in values according to the selected scale C or F 2 The control buttons SET DOWN UP and EXIT are used to set the temperature set point access and set other operating parameters and ac cess and set calibration parameters The functions of the buttons are as follows SET Used to display the next parameter in the 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 control indicator is a two color light emitting diode LE
53. hen press SET twice to access the cut out set point s EXT Access heater power in secondary menu le Pet Heater power in percent SET Access proportional band 8 Controller operation Controller configuration 8 9 8 10 CO Q10 Cut out set point ETE ETE EE EE EE EE To change the cut out set point press UP or DOWN Decrement display CO0 95C i New cut out set point ETE EE EE EE EE EE ET To accept the new cut out set point press SET SET Accept cut out set point The next function is the configuration menu Press EXIT to resume display ing the bath temperature Controller configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via the front panel These are ac cessed from the secondary menu after the cut out set point function by pressing SET The display will prompt with CO nF 6 Press SET once more There are 5 sets of configuration parameters probe parameters operating pa rameters serial interface parameters IEEE 488 interface parameters and con troller calibration parameters The menus are selected using the UP and DOWN keys and then pressing SET See Figure 6 Probe parameters The probe parameter menu is indicated by P ObE i Probe parameters menu Press SET to enter the menu The probe parameters menu contains the pa rameters RO and ALPHA which
54. hoose to set the sample period The current sample period value will be displayed SR j Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value SA 60 j New sample period Duplex mode The next parameter is the duplex mode The duplex mode may be set to full du plex or half duplex With full duplex any commands received by the bath via the serial interface will be immediately echoed or transmitted back to the de vice of origin With half duplex the commands will be executed but not echoed The duplex mode parameter is indicated by Laxsssssanssaunasasanussuanuussamssad 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 LF Serial linefeed parameter nana 41 6055 Calibration Bath User s Guide 42 8 13 8 13 1 8 14 Press SET to access the linefeed parameter nana IEEE 488 parameters Baths may optionally be fitted with an IEEE 488 GPIB interface In this case the user may set the interface address within the IEEE 488 parameter menu This menu does not appear on baths not fitted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Press SET to enter the menu I
55. iac or user error the bath is equipped with an adjustable heater cut out device that will shut 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 importantly protects the bath fluids from being heated beyond the safe operat ing temperature preventing hazardous vaporization breakdown or ignition of the liquid The cut out temperature is programmable by the operator from the front panel of the controller It must always be set below the upper temperature limit of the fluid and no more than 10 degrees above the upper temperature limit of the bath If the cut out is activated because of excessive bath temperature then power to the heater will be shut off and the bath will cool The bath will cool until it reaches a few degrees below the cut out set point temperature At this point the action of the cut out is determined by the setting of the cut out mode parameter The cut out has two modes automatic reset or manual reset If the mode is set to automatic then the cut out will automatically reset itself when the bath temperature falls below the reset temperature allowing the bath to heat up again If the mode is set to manual then the heater will remain disabled until the user manually resets the cut out The cut out set point may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power T
56. ice 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 an 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 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 1 Before you start Safety information BATH SALT Salt used in this unit may produce noxious or toxic fumes under certain circumstances Consult the fluid manufacturer s MSDS Material Safety Data Sheet Proper ventilation and safety precautions must be observed The 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 1 2 2 A Cautions Always operate this instrument at room temperature b
57. ler pa rameters or parameters are reset each time the power to the unit is removed Note Before performing the memory check you need to record the controller calibration parameters found in the CAL menu of the instrument and any user adjusted parameters that you have changed such as the programmable set points and proportional band Memory Check Doing a memory check is the easiest way to verify the ability of the battery to maintain controller parameters 1 Power off the instrument 2 Disconnect the instrument from AC power for 10 seconds 3 Reconnect the AC power and power on the instrument 4 If the display shows InIT and or the cycle count shows a low number such as 0002 the battery is spent and should be replaced Contact a Hart Scientific Au thorized Service Center for assistance 5 After replacing the battery you must reprogram the calibration and user ad justable parameters into the controller 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 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 61
58. nal potentiometer For the 6055 bath this parameter should read between 560 and 570 CO and CG These parameters calibrate the accuracy of the bath set point These are pro grammed at the factory when the bath is calibrated Do not alter the value of these parameters If the user desires to calibrate the bath for improved accuracy then calibrate RO and ALPHA according to the procedure given in Section 10 H and L These parameters set the upper and lower set point limits of the bath DO NOT change the values of these parameters from the factory set values To do so may present danger of the bath overheating and causing damage or fire 43 9 Digital communication interface Serial communications 9 1 9 1 1 Digital communication interface If supplied with the option the 6055 bath is capable of communicating with and being controlled by other equipment through the digital interface Two types of digital interface are available the RS 232 serial interface and the IEEE 488 GPIB interface Serial communications The bath may be installed with an RS 232 serial interface that allows serial dig ital communications over fairly long distances With the serial interface the user may access any of the functions parameters and settings discussed in Section7 with the exception of the BAUD rate setting The serial interface operates with 8 data bits 1 stop bit and no parity The use of a shielded communications ca ble is recommended
59. 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 pb 999 9 pb 15 9 Set proportional band to n pr op band n pr 8 83 Depends on Configuration Read cut out setting c utout C c 9999 x xxx c 620 C in Set cut out setting c utout n r eset Set cut out to n degrees c utout n c 500 Temperature Range Reset cut out now c utout r eset c r Read heater power po wer po po 9999 po 1 duty cycle Configuration Menu Probe Menu Read RO calibration parameter r 0 r r0 999 999 r0 100 578 Set RO calibration parameter ton r 0 n r 100 324 98 0 to 104 9 Read ALPHA calibration al pha al al 9 9999999 al 0 0038573 parameter Set ALPHA calibration parameter al pha n al 0 0038433 00370 to ton 00399 Operating Parameters Menu Read cut out mode cm ode cm cm xxxx cm AUTO Set cut out mode cm ode r eset a uto RESET or AUTO Set cut out to be reset manually cm ode r eset cm r 48 9 Digital communication interface Interface commands Interface command summary cont Command Command Returned Acceptable Command Description Format Example Returned Example Values Set cut out to be reset cm ode a uto cm a automatically Read Stirrer Mode smod smod smod xxxx smod AUTO Set Stirrer Mode smod 0
60. nu is indicated with 5Er 1RL Finally press SET to enter the serial interface parameters menu In the serial interface parameters menu are the baud rate sample rate duplex mode and linefeed parameters Baud rate The baud rate is the first parameter in the menu The display will prompt with the baud rate parameter by showing BA Ud Press SET to choose to set the baud rate The current baud rate value will then be displayed The baud rate of the serial communications may be programmed to 300 600 1200 or 2400 baud The baud rate is pre programmed to 1200 baud Use UP or DOWN to change the baud rate value Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu Sample period The sample period is the next parameter in the menu and prompted with SAf 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 for instance the bath transmits the current measurement over the serial inter face approximately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Adjust the period with UP or DOWN and then use SET to set the sample rate to the displayed value Duplex mode The next parameter is the duplex mode indicated with a UPL The duplex mode may b
61. nues to flash until the temperature is reduced and the cut out is reset The cut out has two modes automatic reset and manual reset The mode de termines how the cut out is reset which allows the bath to heat up again When in automatic mode the cut out resets itself as soon as the temperature is low ered below the cut out set point With manual reset mode the cut out must be reset by the operator after the temperature falls below the set point When the cut out is active and the cut out mode is set to manual reset then the display flashes Cut out until the user resets the cut out To access the reset cut out function press the SET button SET Access cut out reset function The display indicates the reset function 29 6055 Calibration Bath User s Guide
62. ortional 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 Section 8 7 Bath salt is too thick Make sure that the bath salt used is less than 50 centistokes 10 is ideal at the temperature at which the bath is controlling Check the salt manufacturer s specifications 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 probe s resistance The controller alternately 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 cooling causing in stability Increase the width of the proportional band until the temperature stabi lizes Refer to Section 8 7 12 Troubleshooting Commenis 12 2 12 2 1 12 2 2 Problem Causes and Solutions Stir motor does not function Improper setting or normal operation See Section 8 11 2 Stir Mode Select for proper stir mode settings A Note Stir Mode Select defaults to A ut o each time the power of the bath is cycled off and back on Therefore this parameter has to be set each time the bath is powered on if St 8 N is the desired mode of operation If stir motor still does not function contact an Authorized Service Center for assistance The controller does not maintain control
63. owing Wrong cutout setting The cutout disconnects power to the heaters when the bath temperature exceeds the cutout set point This causes the bath tempera ture 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 RE SET the heater only comes on again when the temperature is reduced and the operator manually resets the cutout Refer to Section 8 11 1 Check that the cutout set point is adjusted to 10 or 20 C above 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 be low 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 con stants must be re programmed The values can be found on the Report of Cali bration that was shipped with the instrument 59 6055 Calibration Bath User s Guide 60 Problem Causes and Solutions The display flashes CUToUT alternately with an incorrect process temperature Low batter
64. 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 These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged into an outlet as stated in the specifications of this guide The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged di rectly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordinances Consult a qualified electrician DO NOT use an extension cord or adapter plug DO use a ground fault interrupt device This unit contains a liquid A ground fault dev
65. rature control available with the Model 6055 The Temperature Control mode or the Temperature Drift mode may be selected by a switch on the front panel Temperature control mode The Temperature Control Mode uses a hybrid digital analog PI temperature controller with a lock in amplifier The bath stability is very high with this con troller The temperature is selected using the four button keypad on the front panel Temperatures from 150 to 550 C may be selected directly to a hundredth of a degree Finer adjustment is available using the vernier adjustment Accu racy of the setting is typically 0 5 C or better The controller pulses AC current to the control heaters in a time modulated fashion to compensate for heat gains and losses to the system A two color LED on the control panel glows red when the heaters are on and glows green when they are off and cooling is taking place Note The cooling required for control is supplied through heat loss to ambient The temperature control probe uses a 100 ohm PRT Plug the probe into the rear of the control unit The heaters are internal to the tank They are arranged electrically to provide the 4 control heating positions plus an off position The additional boost heat ing position is accessed from a separate switch on the control panel Temperature drift mode When using the Temperature Drift mode the heater may be set manually to al low the temperature to drift very slowly a few millid
66. riod The melting period for salt serves as a dry out period for the heaters of this bath During this time period all of the safety requirements of the IEC 1010 1 CAN NOT be assumed to be met Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability as stated in the Specifications Set the HEATER switch on the front panel to position LOW and turn the bath on using the front panel POWER switch The bath turns on and begins to heat or cool to reach the previously programmed temperature set point The front panel LED display in dicates the actual bath temperature Setup The probe used with the Model 6055 is a precision PRT sensor The probe should not be bent or damaged in any way Plug the probe into the probe con nector on the rear panel of the bath Plug the stirrer into the receptacle marked STIRRER POWER located on the rear panel of the bath This receptacle is switched on with the instruments con trol after the instrument reaches 200 C 4 Installation Setting the temperature 4 7 Setting the temperature In the following discussion and throughout this manual a solid box around the word SET UP EXIT or DOWN indicates the panel button while the dotted box indicates the display reading Explanation of the button or display reading are to the right of each button or display value To view or set the bath temperature set point proceed as follows T
67. rious commands for accessing the bath controller functions via the digi tal interfaces are listed in this section see Table 1 These commands are used with both the RS 232 serial interface and the IEEE 488 GPIB interface In ei ther case the commands are terminated with a carriage return character The in terface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters which determines a unique command A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example s lt CR gt will return the current set point and s250 00 CR will set the set point set point 1 to 50 00 degrees 47 6055 Calibration Bath User s Guide Table 1 Interface command summary Command Command Returned Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set point s etpoint S set 9999 99 C or F set 150 00 C Set current set point to n s etpoint n s 450 Instrument Range Read vernier v ernier V v 9 99999 v 0 00000 Set vernier to n v ernier n v 00001 Depends on Configuration Read temperature temperature t t 9999 99 C or F t 55 69 C Read temperature units u nits u u X uc Set temperature units u
68. s only apply to baths fitted with the serial interface The parameters in the menu are baud rate sample pe riod duplex mode and linefeed Baud rate The baud rate is the first parameter in the menu The baud rate setting deter mines the serial communications transmission rate The baud rate parameter is indicated by BAUS Serial baud rate parameter Press SET to choose to set the baud rate The current baud rate value will then be displayed 1200 b j 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 unsnasuusuuunusanuansuunuaunuenuuuuenr Press SET to set the baud rate to the new value or EXIT to abort the opera tion and skip to the next parameter in the menu 8 Controller operation Serial interface parameters 8 12 2 8 12 3 8 12 4 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 for in stance the bath transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by SAMPLE Serial sample period parameter Press SET to c
69. salt 0 010 C at 550 C salt Uniformity 0 005 C at 200 C salt 0 010 C at 550 C salt Temperature Setting Digital display with push button entry Set Point Resolution 0 01 C high resolution 0 00018 C Display Temperature 0 01 C Resolution Digital Setting Accuracy 1 C Digital Setting Repeatability 0 01 C Heaters 260 to 2080 W Working Area 107 mm diameter 4 2 in 432 mm deep 17 in removable SST lid special viewing channel for LIG sighting Wetted Parts 304 stainless steel Power 230 V ac 10 50 60 Hz 15 A Volume 19 8 liters 43 kg of bath salt 5 2 gal 95 Ib Size 57 2 cm D x 77 5 cm W x 152 4 cm H 22 5 x 30 5 x 60 in Weight 70 8 kg 156 Ib Distance from Line of Sight to 15 9 mm 5 8 in Top of Fluid Safety OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 Environmental conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions e ambient temperature range 5 50 C 41 122 F e ambient relative humidity maximum 80 for temperature lt 31 C de creasing linearly to 50
70. sting 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 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 will be obtained when using bath temperatures which are just within the most useful operating range of the bath The further apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 50 C and 150 C are chosen as the cali bration temperatures then the bath may achieve an accuracy of say 0 03 C over the range 40 to 160 C Choosing 80 C and 120 C may allow the bath to have a better accuracy of maybe 0 01 C over the range 75 to 125 C but out side 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 c
71. t eu lt a es ko aki Gwan eR we oh A Re e Sh eta 55 1 Before you start Symbols used 1 1 Before you start Symbols used Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description ANG AC Alternating Current ANG AC DC Battery N M CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On O l gt o 6055 Calibration Bath User s Guide Symbol Description G Canadian Standards Association c US OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re CATI fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances C TIC Australian EMC Mark 1 2 Safety information DISCLAIMER Fluke Corporation Hart Scientific Division manufac tures baths for the purpose of temperature calibration Baths used for ap plications other than calibration are used at the discretion and sole responsibility of the customer Hart Scientific cannot accept any responsi bility for the use of baths for any application other than temperature cali
72. tion Bath User s Guide Interface command summary cont Command Command Returned Acceptable Command Description Format Example Returned Example Values Set heater 1 to on fl n f1 1 Set heater 1 to off fl n f1 0 Read Heater 2 f2 12 f2 9 12 0 Set Heater 2 f2 1 0 1or0 Set Heater 2 to on f2 n f2 1 Set Heater 2 to off f2 n f2 0 Read Heater 3 f3 f3 f3 9 f3 1 Set Heater 3 f3 1 0 1or0 Set Heater 3 to on f3 n f3 1 Set Heater 3 to off f3 n f3 0 Read Heater 4 f4 f4 f4 9 f4 1 Set Heater 4 f4 1 0 1or0 Set Heater 4 to on f4 n f4 1 Set Heater 4 to off f4 n f4 0 Read Boost Heater f5 f5 5 9 f5 1 Set Boost Heater f5 1 0 1or0 Set Boost Heater to on f5 n f5 1 Set Boost Heater to off f5 n f5 0 Legend Note Optional Command data Returns either information n Numeric data supplied b y user 9 Numeric data returned to user x Character data returned When DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a to user carriage return and linefeed Then the value is returned as indicated in the RETURNED column 50 9 Digital communication interface Power commands In Table 1 characters or data within brackets and are optional for the command A slash denotes alternate characters or data Numeric data de noted by n may be entered in decimal or exponential notation Characters are shown in lower
73. wer being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time This value may be estimated by watching the red green control indicator light or read di rectly from the digital display By knowing the amount of heating the user can tell if the bath is heating up to the set point cooling down or controlling at a constant temperature Monitoring the percent heater power lets the user know how stable the bath temperature is With good control stability the percent heat ing power should not fluctuate more than 1 within one minute The heater power display is accessed in the secondary menu Press SET and EXIT simultaneously and release The heater power will be displayed as a percentage of full power sx EXT Access heater power in secondary menu IP Pct j 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 exa Return to temperature display Proportional band In a proportional controller such as this the heater output power is proportional to the bath temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bot 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 consequentl
74. y A problem could exist with the memory back up battery If the bat tery voltage is insufficient to maintain the memory data may become scrambled causing problems A nearby large static discharge may also affect data in mem ory Access the battery by removing the L shaped panel covering the display electronics Corrupt controller memory If the problem reoccurs after 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 be tween pins 1 and 4 depending on its current temperature Corrupt controller memory Initialize the memory by performing a Factory Reset Sequence described in a previous solution The controller controls or attempts to control at an inaccurate temperature If the controller appears to operate normally except that the bath s temperature
75. y tends to lower the temperature back down In this way the temperature is maintained at a fairly constant temperature The temperature stability of the bath depends on the width of the proportional band See Figure 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 8 Controller operation Proportional band tional band is too narrow the bath temperature may swing back and forth be cause the controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width The optimum proportional band width depends on several factors among which are fluid volume fluid characteristics viscosity specific heat thermal conduc tivity operating temperature and stirring Thus the proportional band width may require adjustment for best bath stability when any of these conditions change Of these the most significant factors affecting the optimum propor tional band width are the fluid viscosity and thermal noise due to difference in temperature between the fluid and ambient The proportional band should be wider when the fluid viscosity is higher because of the increased response time and also when noise is greater way NS a Proportional

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