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6050H Users Guide 7B2001.vp

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2. 55 11 1 Calibration Points 35 11 2 Measuring the Set point Error 55 11 3 Computing RO and ALPHA 56 11 4 Calibration Example 56 12 Maintenance 59 13 Troubleshooting 61 13 1 Troubleshooting m Remedy 61 13 2 COMMONS ome a SIREN he UE ake edes 63 13 2 1 EME Directive a soen ook mas RR RO Gun eee ded a dt ee qu 63 13 2 2 Low Voltage Directive Safety 63 lii Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 6050H Bath Cross Section Optional Cart Shown 9 Tipping Prevention Bracket Installation 20 Front Panel Features s susc osos R a RR RES te 23 Bath and Lid Components 24 Back Panel Features 26 Controller Operation Flowchart 32 Bath Temperature Fluctuations at Various Proportional Band Settings 37 Serial Communications Cable Wiring 47 Calibration Example 57 Tables Table 1 Table 2 Table 2 Table 2 Table 4 International Electrical Symbols 1 Interface Command Summary 51 Interface Command Summary continued 52 Interface Command Summary continued
3. 53 Power Control Commands 53 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 AN AC Alternating Current ANG AC DC Battery M TA 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 ObP Ol eH On 6050H Calibration Bath User s Guide Symbol Description Canadian Standards Association US OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances C TICK Australian EMC Mark i CAT I The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark 1 2 Safety Information A DISCLAIMER Hart Scientific manufactures baths for the purpose of temperature calibration Baths used for applications other than calibra tion are used at the discretion and sole responsibility of the customer Hart Scientific cannot accept any responsibility
4. The controller does not maintain controller pa rameters or parameters are reset each time the power to the unit is removed A NOTE Before performing the memory check you need to record the con troller calibration parameters found in the CAL menu of the instrument and any user adjusted parameters that you have changed such as the programma ble 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 an Authorized 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 EN 61010 1 and EN 61010 2 010 standards 63
5. 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 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 59 6050H Calibration Bath User s Guide 60 e Ifthe 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 A NOTE When checking the over temperature cutout be sure that the tem perature limits of the bath fluid are not exceeded Exceeding the tempera ture limits of the bath fluid could cause harm to the operator lab and instrument e The over temperature cutout should be checked every 6 months to see that it is working properly In order to check the user selected cutout follow the controller directions Section 9 8 for setting the cutout Both the man ual and the auto reset option of the cutout should be checked Set the bath temperature higher than the cutout Check to see if the display flashes cut out and the temperature is decreasing 13 Troubleshooting Troubleshooting 13 13 1 Troubleshooting In the event the bath appears to function abnormally this section may help to find and solve the
6. 4 On the bath lid is a large rectangular access hole and a small circular access hole These holes are used for placement of thermometers and devices into the bath When possible the access holes should be covered 5 An access hole cover is recommended to cover the large square access opening in the top of the bath This improves bath temperature stability pre vents excess fluid evaporation or fumes and increases safety with hot fluid The user may drill or cut holes in the cover to accommodate the instruments to be calibrated or immersed in the bath Spare covers are available from Hart Scientific 6 The drain tube located at the lower left corner of the bath is for factory use only Back Panel The back panel of the bath contains the following features see Figure 5 on page 26 1 the bath power cord 2 the stirring motor power socket 3 the internal fuses 4 the probe socket 5 the RS 232 interface connector op tional 6 the IEEE 488 interface connector optional and 7 the drain tube A WARNING The drain tube is for factory use only 1 The bath power cord extends from the back of the bath It provides power for the bath temperature controller the heaters and the stirring motor The cord is plugged into an AC mains socket of 230VAC 1090 10 A 50 60 Hz 2 The stirring motor power cord plugs into the socket labelled STIRRER Power to the stirring motor is switched on by the POWER switch on the
7. nstalled Adjust CTO y I SET EXIT Mi Adj ALPHA SETIEXIT SETIEXIT SET EXIT Y Stir Duplex Set point Mode SET SET EXIT EXI IL A T SETIEXIT SETIEXIT SET EXIT Heat Up Power e Linefeed J amp SET SET EXIT EXIT Adj Heat Up Power I SETIEXIT SETIEXIT SETIEXIT EY SETIEXIT m E DO NOT CHANGE THESE VALUES SEE MANUAL y a n y m g Interface Option Installed 7 g 3 Figure 6 Controller Operation Flowchart 32 9 Controller Operation Temperature Set point 9 3 9 3 1 The display will indicate the reset function rESEE Cutout reset function CPP EP EI EEE TI EEE Press SET once more to reset the cutout SET Reset cutout This action also switches the display to the set temperature function To return to displaying the temperature press the EXIT button If the cutout is still in the over temperature
8. Hart Scientific 9 6050H Calibration Bath User s Guide Rev 7B2001 Rev 7B2001 Limited Warranty amp Limitation of Liability Each product from Fluke Corporation Hart Scientific Division Hart is warranted to be free from de fects in material and workmanship under normal use and service The warranty period is one year for the Calibration Bath The warranty period begins on the date of the shipment Parts product repairs and ser vices are warranted for 90 days The warranty extends only to the original buyer or end user customer of a Hart authorized reseller and does not apply to fuses disposable batteries or to any other product which in Hart s opinion has been misused altered neglected or damaged by accident or abnormal conditions of operation or handling Hart warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Hart does not warrant that software will be error free or operate without interruption Hart does not warrant calibrations on the Calibration Bath Hart authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Hart Warranty support is available if product is purchased through a Hart authorized sales outlet or Buyer has paid the applicable international price Hart reserves
9. grees of the selected units C or F 0 00000 pnl 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 AAA n 9 Controller Operation Temperature Scale Units 9 4 Next press EXIT to return to the temperature display or SET to access the temperature scale units selection SET Access scale units Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius C or Fahrenheit F The units are used in displaying the bath tem perature set point vernier proportional band and cutout set point The temperature scale units selection is accessed after the vernier adjustment function by pressing SET From the temperature display function access the units selection by pressing SET 4 times Scale units currently selected Press UP or DOWN to change the units Change units U n lt F New units selected Press SET to accept the new selection and resume displaying the bath temperature Set the new units and resume temperature display 35 6050H Calibration Bath User s Guide 36 9 5 9 6 9 7 Secondary Menu Functions which ar
10. quently Hart Scientific sells a special cart designed to accommodate the bath Thus making the bath much more portable However even with a cart the bath should not be moved full of hot fluid The fluid can splash causing injury or if the bath and cart tip the hot fluid could cause damage to the surrounding area and to personnel CAUTION Care must be used when moving the bath with the fluid solidi fied in the bath The control probe can easily be damaged If the bath must be moved allow the salt to solidify and cool To safely move the bath two people are required One person should lift the bath by the tower while the second person slides their hands underneath the bath tank and lifts the bath Bath Environment CAUTION DO NOT place under a cabinet or other structure Allow for overhead clearance The 6050H Bath is a precision instrument which should be located in an appro priate environment The location should be free of drafts extreme temperatures and temperature changes dirt etc The surface where the bath is placed must be level Because the bath is designed for operation at high temperatures keep all flam mable and meltable materials away from the bath Although the bath is well in sulated top surfaces do become hot Beware of the danger of accidental fluid spills We recommend placing the bath on a heat proof surface such as concrete with plenty of clear space around the bath 17 6050H Calibratio
11. Display Temperature 0 01 C Resolution Digital Setting Accuracy 1 C Digital Setting 0 02 C Repeatability Heaters 400 1200 2000 Watts Access Opening 5 x 10 127 x 254 mm Depth 12 305 mm Wetted Parts 304 stainless steel Power 230 VAC 10 50 60 Hz 10 A 2200 W Volume 7 1 gallons 27 liters requires 112 Ib of bath salt Weight 180 Ib 82 kg Size 28 5 x 20 4 W x 24 5 D 724 x 518 x 622 mm Automation Package Interface it software and RS 232 computer interface are available for set ting bath temperature via remote computer For IEEE 488 add the 2001 IEEE to the automation package Safety OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per 1EC61010 1 Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation 1t 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 at 40 C 11 6050H 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 2 000 meters e
12. Ru qc BE wo LS AE dee e AU o se 42 9 12 2 Sample Period odie e cs dece Ro ecu de cree da 43 9 12 3 Duplex Mods s sia obe kom Remy m eR eS got es d n 43 9 12 4 Unis a a ao vid averte e doo a 44 9 13 IEEE 488 Parameters 44 9 13 1 IBEE 488 Address 4 309 cs dou ak s ie Rh van pi dei s n 44 914 Calibration Parameters 45 9 14 1 CTO rrr 45 9 14 2 COMICO 4 i oen sout ken con m D OY e RE E te ROW RC Be eA 45 9 14 3 Hand L ideo e de d US ORE e RR dd cde dd 46 10 Digital Communication Interface 47 10 1 Serial Communications 47 10 1 1 WAS a ate dura ma de sua a mue e xc RRA ven 47 10 1 2 Sep ae sis ASS dnce RR de te caen von Pha D Ap ny 47 10 121 Bard Rates uu ate R dite El de qe d aed ds We aie aed 48 19 1 22 Sample Period oir ok nue o om LY e wa eee a date als 48 10 1 2 3 Duplex Mode iio ie px Ue EROR up RCRUM ADR Resim UD e ene 48 TOU ZAN mete e its a Rese ER YID IIO DP RUP ek Res Bek Gta DA 48 10 1 3 Serial Operation 43m Gig a een NN ee Wem Ws A Ox RUN Ge 48 10 2 IEEE 488 Communication optional ooa 49 10 2 1 Sep Loos o Reo ete te ah eae Raed A Gene dosie a 49 10 2 1 1 IEEE 488 Interface Address 49 10 2 2 IEEE 488 Operation 49 10 3 Interface Commands 49 10 4 Power Control Functions 53 11 Calibration Procedure
13. 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 21 6050H Calibration Bath User s Guide 22 6 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 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 st
14. alternately with the correct process tempera ture check the following 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 10 8 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 61 6050H Calibration Bath User s Guide 62 Problem Causes and Solutions The display flashes CUTOUT alternat
15. Guide 50 the current set point and s 50 00 CR sets the set point to 50 00 degrees In the table of commands characters or data within brackets and are optional for the command A slash denotes alternate characters or data Numeric data denoted by n may be entered in decimal or exponential nota tion Characters are shown in lower case although upper case may be used Spaces may be added within command strings and are ignored Backspace BS ASCII 8 may be used to erase the previous character A terminating CR is im plied with all commands 10 Digital Communication Interface Interface Commands Table 2 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 t emperature t t 9999 99 C or F t 55 69 C Read temperature units u nits U u x U C Set temperature units u nits c f CorF Set temperature units to Celsius u nits c u C Set temperature units to u nits f u f Fahrenheit Secondary Menu Read proportional band setting pr op band
16. Serial Interface Parameters 9 12 2 9 12 3 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 i New BAUD rate Press SET to set the BAUD rate to the new value or EXIT to abort the op eration and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the serial interface parameter menu The sample period is the time period in seconds between temperature measure ments transmitted from the serial interface If the sample rate is set to 5 the bath transmits the current measurement over the serial interface approximately 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 D AAA NN Press SET to choose to set the sample period The current sample period value will be displayed SAs Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value 5R bU j New sample period asses SERENA fan KOY RESE ka dok KAFE AA Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full du plex or half duplex With full duplex any commands received by the bath via the serial interface are immediately echoed or transmitted back to the device of origin With half d
17. bath is powered on if Str ON is the desired mode of oper ation Stir Set point The stir set point allows setting of the temperature above which the stir motor activates when the stir activation is set to automatic To access the paramter press SET from the stir activation parameter Set point mode selection parameter is indicated by SEr 200 i Stir motor activation set point Press UP or DOWN to change the value and then SET to enter the new value Heat Up Power NOTE This section applies to controller parameters not to High Low setting of the front panel heater switch The Heat Up Power or soft start feature allows heat transfer salt to be melted in the bath without overheating the heaters When salt solidifies it shrinks leav ing gaps between the solid salt and the sides of the bath Applying full power to the heaters while the salt is solid can cause the heaters to overheat since there is poor heat conduction between the walls of the bath and the solid salt The Heat Up Power feature prevents the heaters from overheating by limiting the power When the Heat Up Power is set to Low the heaters operate at 25 power until the temperature reaches 200 C and is completely melted While the solid salt is being heated the control LED flashes The heater switch setting 41 6050H Calibration Bath User s Guide 42 9 12 9 12 1 should be set to HIGH enabling all the heaters to provide adequat
18. fault condition the display continues to flash cutout The bath temperature must drop a few degrees below the cutout set point be fore the cutout can be reset Temperature Set point The bath temperature can be set to any value within the range and with resolu tion as given in the specifications The temperature range of the particular fluid used in the bath must be known by the operator and the bath should only be op erated well below the upper temperature limit of the fluid In addition the cut out temperature should also be set below the upper limit of the fluid Setting the bath temperature involves three steps 1 select the set point mem ory 2 adjust the set point value and 3 adjust the vernier if desired Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the bath to a previously programmed tem perature set point To set the bath temperature first select the set point memory This function is accessed from the temperature display function by pressing SET The num ber of the set point memory currently being used is shown at the left on the dis play followed by the current set point value 25 00 L Bath temperature in degrees Celsius SET Access set point memory i i 25 0 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 m
19. for the use of baths for any ap plication other than temperature calibration Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the terms Warning and Caution e WARNING identifies conditions and actions that may pose hazards to the user e CAUTION identifies conditions and actions that may damage the in strument being used 1 2 1 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 If the control probe is not removed before shipping the bath the 1 Before You Start Safety Information control probe may be damaged during shipping and the Service Centers assume no liability for damage incurred during shipping 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 u
20. handle temperature limit is not exceeded in the air above the instrument The instrument and any thermometer probes used with it are sensitive in struments that can be easily damaged Always handle these devices with care Do not allow them to be dropped struck stressed or overheated DO ensure the salt is cleaned from the probes prior to immersing the probe in the next bath Clean your probe between each bath to avoid con tamination between bath fluids 6050H Calibration Bath User s Guide Under filling the bath may reduce the bath performance and may possibly damage the bath When calibrating PRTs always follow correct calibration procedure and calibrate from high temperatures to low temperatures with the appropriate triple point of water checks Never immerse a wet or cold PRT into a bath filled with hot fluid Severe damage to the PRT may result as well as per sonal injury to the calibration technician This bath is not designed to be portable Therefore moving the bath once it has been installed should be kept to a minimum NEVER MOVE A BATH THAT IS FULL OF HOT FLUID This action could be ex tremely dangerous and could result in personal injury to the person mov ing the bath If the bath is going to be placed in an area where it may need to be moved frequently Hart Scientific sells a special cart designed to ac commodate the bath However even with a cart the bath should not be moved full of hot fluid The fluid
21. has a Permanent Earth Ground that must be connected during use Consult a qualified electrician DO NOT use an extension cord or adapter plug DO use a 30 mA ground fault interrupt device This unit contains a liquid A ground fault device is advised in case liquid is present in the electrical system and could cause an electrical shock Always replace the power cord with an approved cord of the correct rat ing and type If you have questions contact 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 1 Before You Start Safety Information 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 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 adj
22. interface are available the RS 232 serial interface and the IEEE 488 GPIB interface With a digital interface the bath may be connected to a computer or other equipment This allows the user to set the bath temperature monitor the tem perature and access any of the other controller functions all using remote com munications equipment In addition the heater power may be controlled To enable the digital interface to control the heater the HEATER switch must be set to the LOW position Serial Communications The bath may be 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 Section9 with the exception of the BAUD rate setting uu RS 232 Cable Wiring f able Wiring for The serial communications ca IBM PC and Compatibles ble attaches to the bath through the DB 9 connector on the back panel F igure 8 shows the Instrument Computer DTE pin out of this connector and DE CESEN suggested cable wiring To ING into eliminate noise the serial cable 2 RxD e 2 RxD should be shielded with low re nn S LC ka sistance between the connector SONDE ND DB 9 and the shield 6NC 6 DSR 7RTS 7RTS 8CTS 8CTS Setu p 9NC 9NC Before operation the serial in terface of the bath must first be S Instrument Computer DTE set up by programming t
23. or manual reset If the mode is set to automatic the cutout automatically resets itself when the bath temperature falls below the reset temperature allowing the bath to heat up again If the mode is set to man ual the heater remains disabled until the user manually resets the cutout The cutout set point may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET twice to access the cutout set point ser EXIT Access heater power in secondary menu ig Pct Heater power in percent SET Access proportional band 9 Controller Operation Controller Configuration 9 9 9 10 EDs 210 Cutout set point Al To change the cutout set point press UP or DOWN boul Decrement display O 96 New cutout set point pd To accept the new cutout set point press SET SET Accept cutout 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 cutout set point function by pressing SET There are 5 sets of configuration parameters probe parameters oper ating parameters serial interface parameters IEEE 488 interface parameters a
24. pr pb 999 9 pb 15 9 Set proportional band to n pr op band n pr 8 83 Depends on Configuration Read cutout setting c utout C c 9999 x xxx c 620 C in Set cutout setting c utout n r eset Set cutout to n degrees c utout n c 500 Temperature Range Reset cutout now c utout r eset c r Read heater power po wer po po 9999 po 1 duty cycle Configuration Menu Probe Menu Read RO calibration parameter 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 8l 0 0038573 parameter Set ALPHA calibration parameter al pha n al 0 0038433 00370 to ton 00399 Operating Parameters Menu Read cutout mode cm ode cm cm xxxx cm AUTO Set cutout mode cm ode r eset a uto RESET or AUTO Set cutout to be reset manually cm ode r eset cm r 51 6050H Calibration Bath User s Guide Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set cutout to be reset cm ode a uto cm a automatically Read stirrer mode smod smod smod xxxx smod AUTO Set stirrer mode smod o n a uto ON or AUTO Set stirrer to on smod o n smod 0 Set stirrer to automatic smod a uto smod a Read stirrer set point sset sset sset 999 99 C or F set 150 0C Set stirrer set point sset n Sse
25. store the value The display now shows 45 6050H Calibration Bath User s Guide 46 9 14 3 Press SET to show the current value of Cg Use the UP and DOWN keys until the value displayed matches the Cg value on the Report of Calibration Press SET to store the value The display now shows PRET A ELITE PI TTL EE H and L These parameters set the high and low set point limits of the bath These pa rameters are factory set to the following High 550 C 0 C Low 0 C 0 C NOTE DO NOT change the values of these parameters from the factory set values To do so may present danger of the bath overheating and caus ing damage or fire To adjust press SET to show the current value of H Use the UP and DOWN keys until the value matches the factory settings listed above Press SET to store the value The display now shows A Press SET to show the current value of L Use the UP and DOWN keys until the value matches the factory settings listed above Press SET to store the value The display now shows a Press EXIT to return to displaying the temperature 10 Digital Communication Interface Serial Communications 10 10 1 10 1 1 10 1 2 Digital Communication Interface If supplied with the option the 6050H bath is capable of communicating with and being controlled by other equipment through the digital interface Two types of digital
26. the right to invoice Buyer for importation costs of repairs replacement parts when product purchased in one country is submitted for repair in another country Hart s warranty obligation is limited at Hart s option to refund of the purchase price free of charge re pair or replacement of a defective product which is returned to a Hart authorized service center within the warranty period To obtain warranty service contact your nearest Hart authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination to the nearest Hart au thorized service center Hart assumes no risk for damage in transit Following warranty repair the prod uct will be returned to Buyer transportation prepaid FOB Destination If Hart determines that the failure was caused by misuse alteration accident or abnormal condition or operation or handling Hart will provide an estimate or repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IM PLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENT
27. the socket at the back of the bath DO NOT operate the bath without the control probe properly installed Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability See Section 3 1 Specifications on page 11 for power 13 6050H Calibration Bath User s Guide 4 4 details Additionally a separate ground connection is provided and required to permanently connect the instrument to earth ground for added operator safety Setting the Temperature In the following discussion and throughout this manual a button icon around the word SET UP EXIT or DOWN indicates the panel button while the dotted box indicates the display reading see Figure 3 on page 23 Explanation of the button or display reading are to the right of each button or display value To view or set the bath temperature set point proceed as follows The front panel LED display normally shows the actual bath temperature 24 68 L Bath temperature display When SET is pressed the display will show the set point memory that is cur rently being used and its value Eight set point memories are available SET Access set point selection i 25 0 Set point 1 25 0 C currently used Press SET to select this memory and access the set point value SET Access set point value C 25 00 Current value of set point 1 25 00 C Press SET to accept the new value and display the vernier value The bath be gins he
28. the width of the proportional band If the proportional band setting is too wide the long term stability of the bath is affected In this case decrease the width of the band Refer to Section 9 7 Bath salt is too thick Make sure that the bath salt used is less than 50 centi stokes 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 9 7 13 Troubleshooting Comments 13 2 13 2 1 13 2 2 Problem Causes and Solutions Stir motor does not function Improper setting or normal operation See Section 9 11 2 Stir Mode Select for proper stir mode settings A NOTE Stir Mode Select defaults to Auto 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 Str ON is the desired mode of operation If stir motor still does not function contact an Authorized Service Center for assistance
29. using UP or DOWN and pressing SET Serial Operation Once the cable has been attached and the interface set up properly the control ler immediately begins transmitting temperature readings at the programmed rate The set point and other commands may be sent to the bath via the serial 10 Digital Communication Interface IEEE 488 Communication optional 10 2 10 2 1 10 2 1 1 10 2 2 10 3 interface to set the bath and view or program the various parameters The inter face commands are discussed in Section 10 3 All commands are ASCII charac ter strings terminated with a carriage return character CR ASCII 13 IEEE 488 Communication optional The IEEE 488 interface is available as an option Baths supplied with this op tion may be connected to a GPIB type communication bus which allows many instruments to be connected and controlled simultaneously To eliminate noise the GPIB cable should be shielded Setup To use the IEEE 488 interface first connect an IEEE 488 standard cable to the back of the bath Next set the device address This parameter is programmed within the IEEE 488 interface menu To enter the IEEE 488 parameter programming menu first press EXIT while pressing SET and release to enter the secondary menu Press SET repeat edly until the display reaches Pr Gb E This is the menu selection Press UP repeatedly until the IEBE 488 interface menu is indicated with IE E E Pr
30. 2 the control probe 3 the stirring motor 4 the access holes 5 the access hole cover and 6 the drain tube A WARNING The drain is for factory use only Bath Fluid Level gt A WARNING DRAIN IS FOR Figure 4 Bath and Lid Components 24 Ey 6 FACTORY USE ONLY 7 Parts and Controls Back Panel 7 3 1 The bath tank is constructed of stainless steel It is very resistant to oxida tion in the presence of most chemicals and over a wide range of temperatures 2 The control probe provides the temperature feedback signal to the controller allowing the controller to maintain a constant temperature The control probe is a precision platinum resistance thermometer PRT The control probe is deli cate and must be handled carefully The probe is placed in the small hole in the top of the bath so that the probe tip is fully immersed in the bath fluid The probe cable connects to the bath at the probe connector on the back panel 3 The stirring motor is mounted on the bath tank lid It drives the stirring pro peller to provide mixing of the bath fluid Proper mixing of the fluid is impor tant for good constant temperature stability The stirring motor power cord plugs into the back of the bath at the power socket labelled STIRRER
31. 4 AC Ate ies RN REOR dik t cee Bese es e E a f y die Shs ae ee 29 8 5 Fluid Dia 4 4 6065455 6 84686446426 24 6 29 8 6 Temperature Controller 29 9 Controller Operation 31 9 1 Bath Temperature ki ek BR AE RSS ES ESR ES 31 9 2 Re set Cutout 2 4 05 rca X 9E S bee ee 31 9 3 Temperature Set point 33 9 3 1 ProgrammableSet points 33 9 3 2 Setpoint Vall s i hg a XE UR OR X RUN RUN a Kex Rn 34 9 3 3 Setpoint Verniet y sos a a acia Ig ete gw dee P ww p e BO we OR ate 34 9 4 Temperature Scale Units 35 9 5 secondary Menus suos Sk eee Ge dees beeen debe 36 9 6 Heater Power 22 a ko oom oo dut bot 6544 36 9 7 Proportional Band 36 9 8 Cutouts s soi d E Ges 3 x EOS de EUM Se YE doit 38 9 9 Controller Configuration 39 9 10 Probe Parameters 39 9 10 1 ROS 62 ee ee Gu eee A ee Sl eee qe ie 40 9 10 2 ALPHA L an eed e iae arde Sedes yc due Weta d uk deu cac Boake d 40 9 1 Operating Parameters 40 9 11 1 Cutout Reset Mode ceci 24 208 Ra armure dia de a ete et dd ae E 40 9 11 2 Sur Mode Select use dox M RUE a ine T RAS far ie os dn 40 9 11 3 SUESCIEDOME uu sud dede ERR deu La ds 41 9 11 4 Heat Up POWGE aice 4 ae wed oy Nes ees dore Hi Were 41 9 12 Serial Interface Parameters 42 9 12 1 BAUD Rai 4
32. 4 Quick Start cad 9o isol es x we ee ee RR ew a D 4 1 Unpacking 4c box sen Roh m Rom Bo rmm Robo eR Sak v 13 4 2 Set UDe uk ees mo eum mde RGB SL SURG Ox Roe S 13 4 3 POWG eop En aee ER PIE E ERAN es 13 4 4 Setting the Temperature 14 5 Installation 17 9 1 Bath Environments w 5 2 cu a es imiter 17 5 2 Drysout Period 5 26d hose e ho ae vba 18 3 3 Bath Preparation and Filling 18 5 4 lus M RD 18 3 5 POW f a a ey WE SUI OR ROS 19 5 6 Tipping Prevention Brackets Installation 19 5 6 1 Installation On A Concrete Floor wou won ou sw won wou o m n 19 5 6 4 1 Installation Of The Bath e Z vn e gate men ee Ge dane ved 19 6 Bath Use nesr su ses on ee s 21 6 1 General 3 4 6 hue vap rd RUD ALS REQUE X cR Rt 21 6 2 Comparison Calibration 21 6 3 Calibration of Multiple Probes 22 7 Parts and Controls 23 7 1 ErontPanel RS e a fe Gomes 23 7 2 Bath Tank and Lid oaa a 24 47 3 Back Panel 2 2 ls Bas LUE He as 25 8 General Operation lt lt s won on ae eus seu 21 8 1 Bath BUG pM Cc 27 8 1 1 Safety s xd ace de ds dE bee Rd y xor P RS dec semp p d we We A 27 8 12 Heat Transfer Salty vocans KA ee a REO OU ede ode e xe 27 8 2 SITIO Sure REGERE REMISE e Rr go BO an Ge arde dS 28 8 3 POWGE uc RR E wa xxm eee te Se he Sa es BES 28 8
33. AL OR CONSE QUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT TORT RELIANCE OR ANY OTHER THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court of com petent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive e American Fork UT 84003 9775 e USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice e Copyright 2005 Printed in USA Table of Contents 1 Before YouStart 1 1 1 symbols Used uuo ERR UR ei f ARM 1 1 2 Safety Information s cies te een 2 1 2 1 WARNINGS c e race acea y i Ba A xo a See ey T 2 1 2 2 CAUTIONS a fi de feed tmo gr ce A avan des Ca re C RENE f Mas ce E 5 1 3 Authorized Service Centers 6 2 Introduction 9 3 Specifications and Environmental Conditions 11 3 1 Specifications is Ka le xe E v t RR dieu ox oko 11 3 2 Environmental Conditions 11
34. ED dis play the user may monitor the bath temperature set the temperature set point in degrees C or F monitor the heater output power adjust the controller propor tional band set the cutout set point and program the probe calibration parame ters operating parameters serial and IEEE 488 interface configuration and controller calibration parameters Operation is summarized in the flowchart in Figure 6 Please refer to Figure 3 on page 23 for the operation examples in the following sections Bath Temperature The digital LED display on the front panel allows direct viewing of the actual bath temperature This temperature value is what is normally shown on the dis play The units C or F of the temperature value are displayed at the right For example Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Reset Cutout If the over temperature cutout has been triggered the temperature display alter nately flashes Cub out Indicates cutout condition The message continues to flash until the temperature is reduced and the cutout is reset The cutout has two modes automatic reset and manual reset The mode de termines how the cutout is reset which allows the bath to heat up again When in automatic mode the cutout resets itself as soon as the temperature is lowered below the cutout set point With manual reset mode the cuto
35. HA the current values must be known The values may be found by either accessing the probe calibration menu from the controller panel or by inquiring through the digital interface The user should keep a record of these values in case they may need to be re stored in the future The new values RO and ALPHA are computed by entering the old values for RO and ALPHA the calibration temperature set points tj and ty and the temperature errors err and erry into the following equations t t po PE pra 1 1R ty L 1 ALPHA t err 1 ALPHA t Jerry ly t 1 ALPHA ALPHA For example if 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 the new values RO and ALPHA would be computed as 100 193 and 0 0038272 respec tively Program the new values RO and ALPHA into the controller Check the calibration by setting the temperature to 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 re
36. also greater over the range For instance if 50 C and 150 C are chosen as the calibration temperatures then the bath may achieve an accuracy of 0 03 C over the range 40 to 160 C Choosing 80 C and 120 C may allow the bath to have a better ac curacy of maybe 0 01 C over the range 75 to 125 C but outside that range the accuracy may be only 0 05 C Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration temperatures First set the bath to the lower set point tj Wait for the bath to reach the set point and allow 15 minutes to stabilize at that temperature Check the bath stability with the thermometer When both the bath and the thermometer have stabilized measure the bath tem perature with the thermometer and compute the temperature error erry which is the actual bath temperature minus the set point temperature For example if the bath is set for a lower set point of t 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 example suppose the bath 55 6050H Calibration Bath User s Guide 56 11 3 11 4 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 ALP
37. arting 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 by the metrologist The object is to keep the reference probe and the probe s to be calibrated as closely grouped as possible in the working area of the bath Bath stability is maximized when the bath working area is kept covered In preparing to use the bath for calibration start by e Placing the reference probe in the bath working area e Placing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe Calibration of Multiple Probes Fully loading the bath with probes increases the time required for the tempera ture to stabilize after inserting the probes Using the reference probe as the guide be sure that the temperature has stabilized before starting the calibration 7 Parts and Controls Front Panel 7 Parts and Controls 7 1 Front Panel The following controls and indicators are present on the controller front panel see Figure 3 below 1 the digital LED display 2 the control buttons 3 the bath on off power switch 4 the control indicator light and 5 the heater power switch 1 The digital display is an important part of the temperature controller It dis plays the set point temperature and bath temperature as well as t
38. ating or cooling to the new set point SET Store new set point access vernier Current vernier value Press EXIT and the bath temperature will be displayed again 4 Quick Start Setting the Temperature ex Return to the temperature display 24 130 Bath temperature display The bath will heat or cool until it reaches the new set point temperature Set the heater switch to position MED or HIGH to allow the bath to more quickly reach a higher temperature The higher heater settings may be necessary to reach and control at higher temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cutout should be correctly set for added safety See Section 9 8 To obtain optimum control stability adjust the proportional band as discussed in Section 9 7 15 5 Installation Bath Environment 5 5 1 Installation CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty This bath is not designed to be portable Therefore moving the bath once it has been installed should be kept to a minimum WARNING Never move a bath that is full of hot fluid This action could be extremely dangerous and could result in personal injury to the person moving the bath If the bath is going to be placed in an area where it may need to be moved fre
39. ation Bath User s Guide 38 9 8 SET Access proportional band To change the proportional band press UP or DOWN S Decrement display A To accept the new setting and access the cutout set point press SET Pressing EXIT exits to the secondary menu ignoring any changes just made to the pro portional band value SET Accept the new proportional band setting Cutout As a protection against software or hardware fault shorted heater or user er ror the bath is equipped with an adjustable heater cutout device that shuts off power to the heater if the bath temperature exceeds a set value This protects the heater and bath materials from excessive temperatures and most impor tantly protects the bath fluids from being heated beyond the safe operating temperature preventing hazardous vaporization breakdown or ignition of the fluid The cutout temperature is programmable by the operator from the front panel of the controller It must always be set below the upper temperature limit of the fluid and no more than 10 degrees above the upper temperature limit of the bath If the cutout is activated because of excessive bath temperature then power to the heater shuts off and the bath cools The bath cools until it reaches a few de grees below the cutout set point temperature At this point the action of the cut out is determined by the setting of the cutout mode parameter The cutout has two modes automatic reset
40. 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 remove the salt from the probe be fore inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid salt carefully wash the probe in warm water and dry completely before transferring it to another fluid Always be sure that the probe is completely dry before inserting 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 dangerous if the probe has not cooled to room temperature Additionally high temperature fluids may ignite the paper towels if the probe has not been cooled For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature Modify the access cover to accept probes for calibration The bath should be covered at all times Allowing the access cover to be open during the calibration process reduces the stability and accuracy of the test and increases the outgassing of the fluid which can cause safety concerns for attending personnel Comparison Calibration Comparison calibration involves testing a probe unit under test UUT
41. can splash causing injury or if the bath and cart tip the hot fluid could cause damage to the surrounding area and personnel If the bath must be moved 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 Two people are required to safely move the bath One person should lift the bath by the tower while the sec ond person lifts from underneath the bath tank The control probe must be inserted through the lid into the bath fluid and plugged into the socket at the back of the bath DO NOT operate the bath without the control probe properly inserted and attached The bath will not operate correctly without the control probe Injury to operating per sonnel and permanent damage to the bath could occur 1 3 Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services 1 Before You Start Authorized Service Centers Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Scit
42. control panel 3 The system and heater fuses are internal Never replace a fuse with one of a rating greater than that specified The heater fuses protect against shorted heaters 25 6050H Calibration Bath User s Guide 4 The control probe plugs into the bath at the socket on the back of the bath labelled PROBE 5 If the bath is supplied with a serial RS 232 interface the interface cable is attached to the back of the bath at the connector labelled RS 232 6 If the bath is supplied with a GPIB IEEE 488 interface the interface cable is attached to the back of the bath at the connector labelled TEEE 488 7 The drain is for factory use only but must be tightly sealed when the bath is in use Optional Optional IEEE 488 RS 232 PROBE STIRRER A WARNING A DRAIN IS FOR FACTORY USE ONLY NS Figure 5 Back Panel Features 26 8 General Operation Bath Fluid 8 1 8 1 1 General Operation Bath Fluid Heat transfer salt is intended to be used with the 6050H bath Other fluids should not be used Safety Always consider the safety issues associated with using salt in the Warnings and Cautions sections of the Safety Information section Section 1 2 on page 2 of this manual Obviously where there are extreme temperatures there can be danger to personnel and equipment Salt may also be hazardous for other rea sons Some salt may be consider
43. e bath carefully through the large square access hole to a level that will allow for stirring and thermal expansion Under filling may reduce bath perfor mance and may possibly damage the bath heater The salt should never exceed a height of 1 2 below the top of the tank See Figure 4 on page 52 for refer ence to the fluid level with regards to the top of the tank and the lid of the bath Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing Use caution to prevent bath fluid from spilling on the stir motor while filling CAUTION Under filling may reduce the bath performance and may pos sibly damage the bath Probe Inspect the bath controller probe see Figure 4 on page 24 It should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it contains a precision platinum sensor and is mechanically shock 5 Installation Power 5 5 5 6 5 6 1 5 6 1 1 sensitive Dropping striking or other physical shock may cause a shift in resis tance in the probe resulting in diminished bath accuracy If damaged the probe can be replaced Contact the factory for assistance Insert the probe into the inch probe hole at the top left side of the bath lid The tip of the probe must be well immersed in the fluid The probe connector is plugged into the rear of the bath into the socket labeled PROBE Power With the bath power switch off see Figu
44. e baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the menu and prompted with SA f PLE The sample period is the time period in seconds between temperature measurements transmitted from the serial interface If the sample rate is set to 5 the bath transmits the current measurement over the serial interface approxi mately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Adjust the period with UP or DOWN and then use SET to set the sample rate to the dis played value Duplex Mode The next parameter is the duplex mode indicated with d U P L The duplex mode may be set to half duplex HALF or full duplex FULL With full duplex any commands received by the bath via the serial interface are immedi ately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The default setting is full duplex The mode may be changed using UP or DOWN and pressing SET Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables 8 n or disables 8 F F transmission of a linefeed charac ter LE ASCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed
45. e parameter the stirrer mode select and stirrer set point Cutout Reset Mode The cutout reset mode determines whether the cutout resets automatically when the bath temperature drops to a safe value or must be manually reset by the operator The parameter is indicated by Ckor 5E Cutout reset mode parameter O Press SET to access the parameter setting Normally the cutout is set for au tomatic mode D POT ELITE a EE EPL LT MAY Stir Mode Select This parameter along with the Stir set point allows the user to set the tempera ture at which the stir motor is activated This setting is generally used when salt is used for the bath medium For example you can set the mode to auto and the temperature to 200 C This allows the stir motor to shut off and turn on only when the salt is a liquid gt 200 C preventing the stir motor from overheat ing and or being damaged The parameter is indicated by 9 Controller Operation Operating Parameters 9 11 3 9 11 4 Stir motor is set for automatic activation at the stir set point temperature To change the setting to always on press the UP or DOWN buttons and then SET When set to SE r lt D N the stir motor comes on regardless of the temperature set in the stir set point parameter NOTE Stir Mode Select defaults to Auto each time the power of the bath is cycled off and back on Therefore this parameter has to be set each time the
46. e power to melt the salt and to melt it as quickly as possible Once the temperature ex ceeds 200 C the heaters operate at full power again and the control LED glows red constantly until the set point temperature is reached The Heat Up Power always defaults to Low when the bath is switched on The heat up power option is indicated by NESERENRESNEKSENERSRRENEAENEERRREREN PAPE EEE CELA LL EE EL NET LEE LE HU Hi 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 serial RS 232 interface parameters menu is indicated by SEriAL Serial RS 232 interface parameters menu a The Serial interface parameters menu contains parameters which determine the operation of the serial interface These controls only apply to baths fitted with the serial interface The parameters in the menu are BAUD rate sample pe riod duplex mode and linefeed BAUD Rate The BAUD rate is the first parameter in the menu The BAUD rate setting de termines the serial communications transmission rate The BAUD rate parameter is indicated by BHU d Serial BAUD rate parameter Press SET to choose to set the BAUD rate The current BAUD rate value is displayed 1200 b Current BAUD rate nl 9 Controller Operation
47. e used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simulta neously and then releasing The first function in the secondary menu is the heater power display See Figure 6 on page 32 Heater Power The temperature controller controls the temperature of the bath by pulsing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time This value may be estimated by watching the red green control indicator light or read di rectly from the digital display By knowing the amount of heating the user can tell if the bath is heating up to the set point cooling down or controlling at a constant temperature Monitoring the percent heater power allows the user to know the stability of the bath temperature With good control stability the per cent heating power should not fluctuate more than 1 within one minute The heater power display is accessed in the secondary menu Press SET and EXIT simultaneously and release The heater power is displayed as a percent age of full power ser feu Access heater power in secondary menu 12 Pet Heater power in percent To exit out of the secondary menu press EXIT To continue on to the propor tional band setting function press SET Return to temperature display Proportional Band In a proportional controller such as this the hea
48. eck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 403 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 465 6799 5588 E mail antng C singa fluke com When contacting these Service Centers for support please have the following information available Model Number Serial Number Voltage Complete description of the problem 2 Introduction Introduction The Hart Scientific 6050H is a constant temperature bath intended mainly for the application of temperature calibration However its high stability and the availability of factory modifications make it suitable for other uses as well Figure 1 6050H Bath Cross Section Optional Cart Shown 3 Specifications and Environmental Conditions Specifications 3 1 3 2 Specifications and Environmental Conditions Specifications Range 180 C to 550 Ct Stability 0 002 C at 200 C salt 0 004 C at 300 C salt 0 008 C at 550 C salt Uniformity 0 005 C at 200 C salt 0 020 C at 550 C salt Temperature Setting Digital display with push button data entry Set Point Resolution 0 01 C high resolution mode 0 00018 C
49. ed toxic Contact with eyes skin or inhalation of vapors may cause injury A proper fume hood must be used if hazardous or bothersome vapors are produced WARNING Fluids at high temperatures may pose danger from BURNS FIRE and TOXIC FUMES Use appropriate caution and safety equip ment Salt may be flammable or pose a fire hazard and require special fire safety equipment and procedures Environmentally hazardous salts require special disposal according to applica ble federal or local laws after use Heat Transfer Salt Heat transfer salt is often used at high bath temperatures Salt has a very high upper temperature limit and a wide useful temperature range New bath salt melts around 145 C however its viscosity is such that its functional range is from around 180 C up to the upper limit of the bath The melting temperature will change as the salt ages or becomes contaminated When the bath is not in use we recommend keeping the temperature above 230 C to prevent excessive amounts of salt from freezing on the stir shaft and other cooler parts of the tank Viscosity is low especially at higher temperatures Salt when melted has very low electrical resistivity Salt may be corrosive to some materials Salt will quickly oxidize the coating on galvanized metal Carbon steel may be used with salt up to 450 C Beyond this temperature stainless steel is recommended CAUTION Keep all combustible materials away from the bath when us ing sal
50. ely with an incorrect process temperature Low battery 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 appea
51. emory 4 40 0 C cl 33 6050H Calibration Bath User s Guide 34 9 3 2 9 3 3 Press SET to accept the new selection and access the set point value 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 408 00 O Set point 4 value in C If the set point value does not need to be changed press EXIT to resume dis playing the bath temperature Press UP or DOWN to adjust the set point value Increment display New set point value When the desired set point value is reached press SET to accept the new value and access the set point vernier If EXIT is pressed instead any changes made to the set point are ignored SET Accept new set point value Set point Vernier The set point value can be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a more precise bath temperature The set point vernier allows the temperature to be adjusted below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an 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
52. ess SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter IEEE 488 Interface Address The IEEE 488 address is prompted with Addr E55 Press SET to program the address The default address is 22 Change the device address of the bath if necessary to match the address used by the communication equipment by pressing UP or DOWN and then SET IEEE 488 Operation Commands may now be sent via the IEEE 488 interface to read or set the tem perature or access other controller functions All commands are ASCII charac ter strings and are terminated with a carriage return CR ASCII 13 Interface commands are listed below Interface Commands The various commands for accessing the bath controller functions via the digi tal interfaces are listed in this section see Table 2 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 returns 49 6050H Calibration Bath User s
53. fire hazard When removing probes from the bath DO NOT wipe probes down with a paper towel If the bath setpoint is high the salt can cause the paper towel to ignite in your hand Provide a safe surface and situation for the probes to cool prior to cleaning the salt from the probes The bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot when removed from the bath Cautiously handle probes to prevent personal injury Carefully place probes on a heat resistant surface or rack until they are at room temperature Be extremely careful when filling the bath with salt and bringing it up to temperature Salt expands with temperature It is easy to add salt but ex tremely dangerous to remove hot molten salt because the bath is over filled DO NOT fill the bath above the indicated fill line when the stirring is on It will overflow ELECTRICAL HAZARD 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 listed in Section 3 1 Specifications The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordinances Additionally the instrument
54. he Connector Connector BAUD rate and other configura DB 9 Pin DB 25 Pin tion parameters These parame Hc a XD e Xi ters are programmed within the 3TxD 3RxD serial interface menu The serial ANC 4RTS A 86D U 5CTS interface parameters menu is SNG KO kak outlined in Figure 6 on page 32 7 RTS JL reno 8CTS 8DCD To enter the serial parameter 9NC L 20DTR programming mode first press Figure 8 Serial Communications Cable Wiring 47 6050H Calibration Bath User s Guide 48 10 1 2 1 10 1 2 2 10 1 2 3 10 1 2 4 10 1 3 EXIT while pressing SET and release to enter the secondary menu Press SET repeatedly until the display reads Pr ob E This is the menu selection Press UP repeatedly until the serial interface menu is indicated with 5E r IRE Finally press SET to enter the serial parameter menu In the serial in terface parameters menu are the baud rate the sample rate the duplex mode and the linefeed parameter Baud Rate The baud rate is the first parameter in the menu The display prompts with the baud rate parameter by showing BA U d Press SET to choose to set the baud rate The current baud rate value is displayed The baud rate of the serial interface may be programmed to 300 600 1200 or 2400 baud The baud rate is pre programmed to 1200 baud Use UP or DOWN to change the baud rate value Press SET to set th
55. he various other bath functions settings and constants The display shows temperatures in values according to the selected scale units C or F 2 The control buttons SET DOWN UP and EXIT are used to set the bath temperature set point access and set other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows SET Used to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored 3 The on off switch controls power to the entire bath including the stirring motor 4 The control indicator is a two color light emitting diode LED This indica tor lets the user visually see the ratio of heating to cooling When the indicator is red the heater is on and when it is green the heater is off and the bath is cooling 6050H HIGH PRECISION BATH 60 C to 550 C Hart Scientific 4 HEATING HEATER Figure 3 Front Panel Features 23 6050H Calibration Bath User s Guide 5 The heater power switch is used to select the appropriate heater power lev els for heating and controlling temperatures 7 2 Bath Tank and Lid The bath tank and lid assembly includes see Figure 4 on page 24 1 the tank
56. indoor use only 12 4 Quick Start Unpacking 4 4 1 4 2 4 3 Quick Start A CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty This section gives a brief summary of the steps required to set up and operate the 6050H bath This should be used as a general overview and reference and not as a substitute for the remainder of the manual Please read Section 5 through 8 carefully before operating the bath Unpacking Unpack the bath carefully and inspect it for any damage that may have oc curred during shipment If there is shipping damage notify the carrier immediately Verify that all components are present e Bath e Access Hole Cover e Controller Probe e Manual e Report of Test If you are missing any item please contact an Authorized Service Center Set Up Set up of the bath requires careful unpacking and placement of the bath filling the bath with salt installing the probe and connecting power Consult Section 5 for detailed instructions for proper installation of the bath Be sure to place the bath in a safe clean and level location Remember that the bath operates at very high temperatures Fill the bath tank with salt See Section 8 1 2 Heat Transfer Salt Refer to sections 6 through 7 for more information on bath setup and use The control probe must be inserted through the lid into the bath and plugged into
57. le Values Set heater to on fnz1 fi 1 Legend Note Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user When DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a carriage return and linefeed Then the value is returned as indicated in the RETURNED column 10 4 Power Control Functions The digital interface is capable of controlling the heating functions so that the bath can be remotely operated at any temperature within the range of the bath To allow the interface to control the heating the front panel controls are dis abled by switching the heater switch to LOW Otherwise the interface would not be able to switch the heater functions off The 6050H bath has two control functions with the digital interface These control functions are for heaters set tings Med and High To control the heaters with the digital interface the front panel heater switch must be set to LOW The heater function is controlled with the F1 and F2 commands These commands are either set to O or 1 according to Ta ble 4 on page 53 The default settings are F1 0 and F2 0 which is LOW Sending a command without a parameter returns the state 1 for on or 0 for off Table 4 Power Control Commands Power Fi F2 400 W 0 0 1200 W 1 0 2000 W x 1 53 11 Ca
58. libration Procedure Calibration Points 11 11 1 11 2 Calibration Procedure A NOTE This procedure is to be considered a general guideline Each lab oratory should write their own procedure based on their equipment and their quality program Each procedure should be accompanied by an un certainty analysis also based on the laboratory s equipment and environ ment In some instances the user may want to calibrate the bath to improve the tem perature set point accuracy Calibration is done by adjusting the controller probe calibration constants RO and ALPHA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set point The thermometer used must be able to measure the bath fluid temper ature with higher accuracy than the desired accuracy of the bath By using a good thermometer and carefully following procedure the bath can be calibrated to an accuracy of better than 0 02 C over a range of 100 degrees Calibration Points In calibrating the bath RO and ALPHA are adjusted to minimize the set point error at each of two different bath temperatures Any two reasonably separated bath temperatures may be used for the calibration however best results are ob tained when using bath temperatures which are just within the most useful op erating range of the bath The farther apart the calibration temperatures the larger the calibrated temperature range but the calibration error is
59. m being overheated until the salt is completely molten This program controls the heater duty cycle at 2596 until the bath temperature reaches 200 C To allow the bath to control below 200 C the soft start feature must be deactivated see Section 9 11 2 Stir Mode Select on page 40 Section 9 11 3 Stir Set point on page 41 and Section 9 11 4 Heat Up Power on page 41 Salt is supplied in a pink granular form Fill the bath gradually as the salt heats and melts Because of the heat required to melt the salt this is a slow process and may take 10 hours or more Fill the bath until the liquid is a few inches be low the lid The level will rise as much as two inches as it is heated to the upper temperature limit Stirring Stirring of the bath fluid is very important for stable temperature control The fluid must be mixed well for good temperature uniformity and fast controller response The stirrer is precisely adjusted for optimum performance When the salt in the bath is solid it is very important that the stirrer power be disconnected until the salt melts Otherwise the stirrer will likely over heat and be damaged Power Power to the bath is provided by an AC mains supply See Section 3 1 Specifi cations for power details See Figure 5 on page 26 Power to the bath passes through a filter to prevent switching spikes from being transmitted to other equipment 8 General Operation Heater 8 5 8 6 To turn on the bath s
60. n Bath User s Guide 5 2 5 3 5 4 If the bath is operated at high temperatures a fume hood should be used to re move any vapors given off by hot bath fluid Dry out Period WARNING Before initial use after transport and any time the instru ment has not been energized for more than 10 days the bath will need to be energized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to applying power such as storage in a low humidity tem perature chamber operating at 50 C for 4 hours or more Bath Preparation and Filling The Model 6050H Bath is only intended to be used with salt Bath salt is avail able from Hart Scientific and other sources Bath salt is discussed in detail in Section 8 1 2 Remove any access hole cover from the bath and check the tank for foreign matter dirt remnant packing material etc Before filling the bath make sure the drain is well plugged see Figure 4 and Figure 5 on pages 24 and 26 When using heat transfer salt you must follow a special procedure in filling and heating the bath because the salt is solid at lower temperatures See Section 8 1 2 Disconnect power to the stirrer if at any time the material in the bath is solid and prevents the stirrer from turning Fill the bath with clean unpolluted salt Fill th
61. nd controller calibration parameters The menus are selected using the UP and DOWN keys and then pressing SET Probe Parameters The probe parameter menu is indicated by Pr QbE i Probe parameters menu Press SET to enter the menu The probe parameters menu contains the pa rameters RO and ALPHA which characterize the resistance temperature rela tionship of the platinum control probe These parameters may be adjusted to improve the accuracy of the bath This procedure is explained in detail in Section 1 The probe parameters are accessed by 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 causes the parameter to be skipped ignoring any changes that may have been made 39 6050H Calibration Bath User s Guide 9 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 9 10 2 ALPHA 40 9 11 9 11 1 9 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 UP to enter the menu The operating parameters menu contains the cut out reset mod
62. oor Installation Of The Bath Slide the back casters of the bath completely into the bracket caster slots see Figure 2 on page 20 Lock the front casters of the bath Check that the bath is securely locked into the brackets by gently pushing on the bath Proceed to fill the bath with the applicable bath fluid after reading the entire User s Guide If you have any questions concerning installation of the tipping prevention brack 19 6050H Calibration Bath User s Guide ets please contact an Authorized Service Center see Section 1 3 Authorized Service Centers Wall Caster Slots Figure 2 Tipping Prevention Bracket Installation 20 6 Bath Use General 6 6 1 6 2 Bath Use A CAUTION Read before placing the bath in service The information in this section is for general information only It is not de signed to be the basis for calibration laboratory procedures Each laboratory will need to write their own specific procedures General The 6050H bath is intended tob used with heat transfer salt only Refer to the MSDS Material Safety Data Sheet for information specific to the salt se lected Generally baths are set to one temperature and used to calibrate probes only at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left energized reducing the stress on the system The bath generates extreme temperatures Precautions must
63. ou check the appropriate 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 6050H Calibration Bath User s Guide 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 the individual MSDS sheets for the three components that make up the salt The bath is provided with an access cover The access cover can be modi fied to allow the probes being calibrated to be inserted through the access cover The bath should be operated with the access cover on at all times Operating the bath without the access cover reduces stability increases out gassing of fluids and increases the possibility of personal injury or
64. problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please read this sec tion carefully and attempt to understand and solve the problem If the bath seems faulty or the problem cannot otherwise be solved then contact 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
65. rature As a second protection device the controller is also equipped with a separate thermocouple temperature monitoring circuit which will shut off the heater if the temperature exceeds the cutout set point The controller allows the operator to set the bath temperature with high resolu tion set the cutout adjust the proportional band monitor the heater output power and program the controller configuration and calibration parameters The controller may be operated in temperature units of degrees Celsius or Fahr enheit The controller is operated and programmed from the front control panel using the four key switches and digital LED display The controller may also be optionally equipped with an RS 232 serial or IEEE 488 GPIB digital interface see Figure 5 on page 26 for remote operation Operation of the controller us ing the front control panel is discussed in Section 9 Operation using the digital interfaces is discussed in Section 10 When the controller is set to a new set point the bath will heat or cool to the new temperature Once the new temperature is reached the bath usually takes 10 15 minutes for the temperature to settle and stabilize There may be a small overshoot or undershoot of about 0 5 C 9 Controller Operation Bath Temperature 9 1 9 2 Controller Operation This chapter discusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key switches and L
66. re 3 on page 23 plug the bath into an AC mains outlet of the appropriate voltage frequency and current capacity See Section 3 1 Specifications for power details A separate ground connec tion is provided and required to permanently connect the instrument to earth ground for added operator safety Be sure the stirring motor power cord is plugged into the STIRRER socket at the back of the bath see Figure 5 on page 26 Tipping Prevention Brackets Installation WARNING Hart Scientific recommends installing the bath on a heat re sistant non flammable surface In order to create the safest possible conditions under use your bath comes equipped with Tipping Prevention Brackets The installation of the brackets is required for compliance with the International Safety Standard IEC 61010 1 Section 7 3 Stability which applies to the stability of the bath under normal operating conditions Installation On A Concrete Floor Using a concrete drill and concrete drill bit drill three 1 4 inch x 1 1 4 inch deep approximately 6 5 mm x 32 mm holes in the concrete floor using the bracket to mark the hole placement Drop the flare anchor bolt into the hole Tightening the screw expands the anchor in the drilled hole and secures the bracket Ensure that the bracket is installed in such a way as to ensure the bath will have a minimum of 6 inches of clearance for air circulation see Figure 2 on page 20 Screw the brackets securely to the fl
67. rs to operate normally except that the bath s temperature 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
68. ry 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 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 CAE D LILI EE KEN IEEE CTO Parameter CTO sets the calibration of the over temperature cutout This param eter is not adjusted through software It is adjusted with an internal potentiome ter The following values are set by the factory 565 C 5 C CO and CG These parameters calibrate the accuracy of the bath set point They are pro grammed at the factory when the bath is calibrated and the values are entered onto the Report of Test Note Do not alter the value of these parameters If improved bath accuracy is needed calibrate RO and ALPHA according to the procedure given in Section 11 To restore these values press SET to display Press SET to show the current value of CO Use the UP and DOWN keys until the value displayed matches the CO value on the Report of Calibration Press SET to
69. s and for scan ning at slower rates When controlling at the MED or HIGH heater power settings instead of LOW the proportional band may need to be increased typically two or four times to compensate for the increase in power gain Oth erwise the temperature may oscillate Fluid Drain The drain at the back of the bath see Figure 5 on page 26 is for factory use only During operation of the bath the drain plug must be screwed on tightly Temperature Controller The bath temperature is controlled by Hart Scientific s unique hybrid digi tal analog temperature controller see Figure 3 on page 23 The controller of fers the tight control stability of an analog temperature controller as well as the flexibility and programmability of a digital controller The bath temperature is monitored with a platinum resistance sensor in the con trol probe The signal is electronically compared with the programmable refer ence signal amplified and then fed to a pulse width modulator circuit which controls the amount of power applied to the bath heater 29 6050H Calibration Bath User s Guide 30 The bath is operable within the temperature range given in the specifications For protection against solid state relay failure or other circuit failure the mi cro controller will automatically turn off the heater with a second mechanical relay anytime the bath temperature is more than a certain amount above the set point tempe
70. s viscosity specific heat thermal conduc tivity heater power setting operating temperature and stirring Thus the pro portional band width may require adjustment for best bath stability when any of these conditions change Of these the most significant factors affecting the op timum proportional band width are heater power setting and fluid viscosity The proportional band should be wider when the higher power setting is used so that the change in output power per change in temperature remains the same The proportional band should also be wider when the fluid viscosity is higher because of the increased response time The proportional band width is easily adjusted from the bath front panel The width may be set to discrete values in degrees C or F depending on the selected units The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the control ler percent output power display Narrow the proportional band width to the 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 C EXIT Access heater power in secondary menu le Pct j Heater power in percent 37 6050H Calibr
71. ser e DO 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 5 3 Bath Preparation and Filling for spe cific instructions 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 y
72. spectively Refer to Figure 9 for ap plying equations to the example data and computing the new probe constants 11 Calibration Procedure Calibration Example RO 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 RO 0 086 x 80 0 0 157 x120 0 120 0 80 0 0 00385 1 00 000 100 115 Compute ALPHA 12 0 00385x120 0 0157 1 0 00385 x 80 0 0 086 ai i ALPHA 0 00385 0 0038387 120 0 80 0 Figure 9 Calibration Example 57 12 Maintenance 12 Maintenance The calibration instrument has been designed with the utmost care Ease of op eration and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments 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 oil salt or dust Use a paint safe cleaning agent on all painted
73. surfaces Solvents such as Trichloroethylene or Acetone may dull or dissolve the paint The stainless steel surfaces may be cleaned with solvents as necessary to re move salt e The stirring motor should be clean to allow proper cooling Normally only the outside surfaces will require any attention If the inside of the motor has become heavily loaded with salt or dust blow it out with com pressed air Follow normal safety procedures when using pressurized gas ses 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 sufficient e If a hazardous material is spilled on or inside the equipment the user is responsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material MSDS sheets applicable to all salt used in the bath should be kept in close proximity to the instrument
74. t Operate the bath on a heat proof surface such as concrete Pro vide a means of safely containing any spills which may occur The greatest safety concern with liquid salt is with its high temperature The fluid provides a source of heat which can ignite or destruct materials Espe 27 6050H Calibration Bath User s Guide 28 8 2 8 3 cially dangerous are spills since the hot fluid is difficult to contain Salt may also cause steam explosions if it comes into contact with water or other volitile fluids Using salt requires special caution Read carefully the information and safety data sheets provided with the salt Use of a fume hood is recommended to remove any products of decomposition or oxidation Because salt is solid at room temperature special procedures are required in us ing the bath with salt Before filling the bath with solid salt disconnect the stir ring motor to prevent it from being damaged See Section 9 11 2 Stir Mode Select CAUTION Never allow the stir motor to run with solid material in the bath Restraining the motor from turning may over heat and damage the motor Use HIGH heat Heater Switch and LO Heat Up Power see section 9 11 4 with solid salt A Fast Start Heater Model 2024 may be used to aid in the melting of solid salt See Section 9 11 2 Stir Mode Se lect on page 40 Solid salt has poor thermal conductivity The 6050H bath uses a special soft start program to prevent the heaters fro
75. t 450 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 ali du h Set serial linefeed mode Iffeed 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 c0 c0 b0 9 b0 0 Set CO calibration parameter to n cO n c0 0 999 9 to 999 9 Read CG calibration parameter cg cg bg 999 99 bg 156 25 Set CG calibration parameter to n cg n cg 156 25 999 9 to 999 9 Read low set point limit value ti ow tl tl 999 tl 80 Set low set point limit to n tifow n ti 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 fn f f1 9 fa Set heater fn 1 0 1 on Ozoff 0 or n 1 or 2 Set heater to off fn 0 f1 0 52 10 Digital Communication Interface Power Control Functions Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Examp
76. ter output power is proportional to the bath temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bot tom of the proportional band the heater output is 100 At the top of the pro portional band the heater output is 0 Thus as the bath temperature rises the heater power is reduced which consequently tends to lower the temperature 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 9 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 MAMAN A Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band e Figure 7 Bath Temperature Fluctuations at Various Proportional Band Settings The optimum proportional band width depends on several factors among which are fluid volume fluid characteristic
77. uplex the commands are executed but not echoed The du plex mode parameter is indicated by pd A aii 43 6050H Calibration Bath User s Guide 44 9 12 4 9 13 9 13 1 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 A Td od O DO On Ne 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 NUITS A O Press SET to enter the menu IEEE 488 Address The IEEE 488 interface must be configured to use the same address as the ex ternal communicating device The address is indicated by a Add ee 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 O 9 Controller Operation Calibration Parameters 9 14 9 14 1 9 14 2 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 to
78. usted 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 CAUTIONS Always operate this instrument at room temperatures listed in Section 3 2 Environmental Conditions Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument DO NOT overfill the bath Overflowing liquid may damage the electrical system Be sure to allow for thermal expansion of the fluid as the bath temperature increases See Section 5 3 Bath Preparation and Filling for specific instructions Read Section 6 Bath Use before placing the unit into service DO NOT change the values of the bath calibration constants from the fac tory set values The correct setting of these parameters is important to the safety and proper operation of the unit Only authorized personnel should perform the Factory Reset Sequence if no other action is successful in correcting a malfunction You must have 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
79. ut must be reset by the operator after the temperature falls below the set point When the cutout is active and the cutout mode is set to manual reset the display flashes cutout until the user resets the cutout To access the reset cut out function press the SET button SET Access cutout reset function 31 6050H Calibration Bath User s Guide Display Secondary Functions Temperature gt SET EXIT v Display Power I SET Y Cutout Active Set Proportional Band 1 SET EXIT Select Setpoint Y SET Set Cutout Y SET Adjust Setpoint I SET Y Adjust Vernier I SET Y Set Scale C F A SET ExT EXIT Operating IEEE 488 Pura ene Parameters Interface Ca On Menu Menu pon SET ser X5 Y Y SET Cutout Device L bae C omm ens SET SET Adj RO L SET EXIT EXIT EXIT SET Adj Cutout Adjust Adj Device Reset Mode BAUD Rate Address I I I I SETIEXIT SETIEXIT SETIEXIT SET EXIT Y Stir Sample ALPHA Mode Select Cam o EEE 488 SET EX i SET EXT
80. witch the control panel power switch to the ON position The stirring motor will turn on the LED display will begin to show the bath temperature and the heater will turn on or off until the bath temperature reaches the programmed set point When powered on the control panel display will briefly show a four digit num ber This number indicates the number of times power has been applied to the bath Also briefly displayed is data which indicates the controller hardware configuration This data is used in some circumstances for diagnostic purposes Heater The power to the bath heater is precisely controlled by the temperature control ler to maintain a constant bath temperature Power is controlled by periodically switching the heater on for a certain amount of time using a solid state relay The front panel red green control indicator see Figure 3 on page 23 shows the state of the heater The control indicator glows red when the heater is on and glows green when the heater is off The indicator will pulse constantly when the bath is maintaining a stable temperature The heater has three power level settings The MED and HIGH heater power settings are used to more quickly heat the bath fluid up to the desired op erating temperature These heater power settings may also be required for con trol at higher temperatures The HIGH setting is used to heat solid salt The LOW setting is used when controlling at lower temperature

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