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Access set-point memory

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1. 1 1 1 A 1 1 Probe Operating gt Serial Calibration Menu down Parameters DOWN Interface DOWN Interface vom MER a M 1 a Menu lenu c lt 1 1 SET SET SET SET sat 5 1 Y Y Y Y Cutout BAUD 1 Device g Ro Reset Mode Rate Address s sm s BUT sm Y j Adj Cutout an th faa X m I 1 SEI EUT SET em gt cE SEENT Ee SET DIT Boost Heat Duple uplex ALPHA Mode Mode IEEE 488 2 EJ sm H gt s Option Installed S s Y EDD 5 Boost SET EXTT SEI EUIT SET EXIT SEL EXT ee ESE T Cu I 5 Figure 5 Controller Operation Flowchart 38 9 Controller Operation Temperature Set point 9 3 9 3 1 Cutout reset function 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 t
2. 28 8 1 5 Thermal Expansion Sac pg n a een a 28 8 1 6 Blectrical Resistivity use m Wissen Bee e ee Re 29 8 1 7 Fluid Lifetimes du aeg a cae ns Ms duque 29 8 1 8 Safety aoe dU aue alas ae do e qa ae ede 29 8 1 9 COS tiie 52 re dum d sed pd med m sebum d uui mo dud dedos 30 8 1 10 Commonly Used Pluids 4 4 da 30 Water uns dime perder C Ke mel dei dee psp ol ok 30 1 10 2 Ethylene Glycol a SRA RA AR RU 4 30 81103 Min ral Oil oe enix acid op a ie x bie IPRC UR Le we 30 8 1 10 4 Silicone SL Bes 30 8 1 11 Fluid Characteristics Charts 2 2 31 8 1 11 1 Limitations and 31 8 1 11 2 Aboutthe Chart 2 e ok eh we Se 31 ocak oe RR Sew ETT 34 POW L x esum Re See GP ES 34 Heater oe opo x ww SU ee EX ew o WES 34 Temperature 34 9 Controller 37 9 1 9 2 9 3 9 4 9 5 9 6 Bath Temperature eee 37 Reset Cutout s uo 69 ES 37 Temperature 39 9 3 1 Programm
3. DO NOT overfill the bath Overflowing extremely cold or hot fluid may be harmful to the operator See Section 5 5 Bath Preparation and Filling for specific instructions Follow all safety guidelines listed in the user s manual Calibration Equipment should only be used by trained personnel If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired Before initial use or after transport or after storage in humid or semi hu mid environments or anytime the instrument has not been energized for more than 10 days the instrument needs to be energized for a dry out 1 Before You Start Safety Information period of 2 hours before it can be assumed to meet all of the safety re quirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to apply ing power such as storage in a low humidity temperature chamber operat ing at 50 C for 4 hours or more Overhead clearance is required Do not place the instrument under a cabi net or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes e The instrument is intended for indoor use only e The unit is a precision instrument Although it has been designed for opti mum durability and trouble free operation it must be handled with care Position the unit before the tank is filled with flui
4. 10 10 1 10 1 1 10 1 2 Digital Communication Interface The 6331 bath is capable of communicating with and being controlled by other equipment through the digital interface Two types of digital interface are avail able the RS 232 serial interface which is standard and the IEEE 488 GPIB interface Serial Communications The RS 232 serial interface allows serial digital communications over fairly long distances With the serial interface the user may access any of the func tions parameters and settings discussed in Section 9 Controller Operation with the exception of the baud rate setting The serial interface operates with 8 data bits 1 stop bit and no parity Wiring The serial communications cable attaches to the bath RS 232 Cable Wiring for through the DB 9 connector IBM PC and Compatibles on the rear panel Figure 7 shows the pin out of this connector and suggested ca Instrument Computer DTE ble wiring To eliminate noise the serial cable should A in Min e be shielded with low resis JRD tance between the connector 3TxD 3TxD DB 9 and the shield ANC e 4DTR 5 GND 5GND 6NC 6 DSR Setup 7RTS 7RTS 8CTS 8CTS Before operation the serial 9NC ONC interface of the bath must first be set up by program ming the baud rate and other t Instrument Computer DTE configuration parameters Connector Connecter
5. Hart Scientific 9 6331 Calibration Bath User s Guide Rev 542603 Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive e American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice Copyright 2005 Printed in USA Rev 5A2603 Table of Contents 1 Before You 1 1 symbols Used uoo o ERR eG ERA 1 1 2 Safety Information 2 1 2 1 vorne 2 1 2 2 CAUTIONS g aak a ai ae dis EC 4 1 3 Authorized Service Centers 5 2 Introduction 7 3 Specifications and Environmental Conditions 9 3 1 2 2 gt 9 3 2 Environmental 10 3 3 Warranty cede eee PORE S Pee a ue 10 4 Quick Start s ee eo bees eee amp wll 4 1 Unpacking as s na e a eS he E ES 11 4 2 Set o due Vesp os Ba ee e ded HIE ees 12 4 3 POWEL 4 xo cx mom re Re 14 4 4 Setting the 14 5 Installation 17 5 1 Moving or Uncrating the Bath 17 5 2 Bat
6. User s Guide New set point memory 4 40 0 C Press SET to accept the new selection and access the set point value Accept selected set point memory 9 3 2 Set point Value The set point value may be adjusted after selecting the set point memory and pressing SET The set point value is displayed with the units C or F at the left ae Y 7 If the set point value need not be changed then press EXIT to resume dis playing the bath temperature To adjust the set point value press UP or DOWN Increment display um rci When the desired set point value is reached press SET to accept new value and access the set point vernier If EXIT is pressed any changes made to the set point are ignored SET Accept new set point value 9 3 3 Set point Vernier 40 The set point value can be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a more precise bath temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed from the set point by pressing SET The vernier setting is displayed as a 6 digit num ber with five digits after the decimal point This is a temperature offset in de grees of the selected units C or F Current vernier value in C To adjust the vern
7. C oil 5012 0 017 at 200 C oil 5017 0 025 C at 300 C oil 5017 Heating Timet with boost 140 minutes from 35 C to 300 C oil 5017 Cooling Time 900 minutes from 300 C to 100 C oil 5017 Stabilization Time 15 20 minutes Temperature Setting Digital display with push button data entry Set point Resolution 0 01 C high resolution mode 0 00018 C Display Resolution 0 01 C Digital Setting Accuracy 1 Digital Setting Repeatability 0 01 Control Heater 700 Watts Boost Heater 900 Watts Access Opening 6 8 x 4 7 172 x 119 mm Depth 18 457 mm without liquid in glass calibration kit 19 482 mm with liquid in glass calibration kit Wetted Parts 304 Stainless Steel Powert 115 VAC 10 50 60 Hz 14 8 Amps 230 VAC 1090 50 60 Hz 3 5 Amps 1700 W Volume 4 2 gallons 15 9 liters Weight 90 Ib 41 kg Dimensions 14 W x 31 D x 42 H 356 x 788 x 1067 mm 37 940 mm from floor to tank access opening Safety OVERVOLTAGE Installation CATEGORY II pollution Degree 2 per IEC 1010 1 Interface Package RS 232 included IEEE 488 optional Rated at listed 115 V or optional 230 V 6331 Calibration Bath User s Guide 3 2 3 3 Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instrument should not be operated i
8. C 0 358 40 C 0 00035 25 0 00075 100 25 C 550 5016 300 C fl 10 104 C 0 386 100 C 1 150 C 0 433 200 C Silicone Oil Type 80 C v 300 C fl 302 C 50 80 C 1 11 25 C 0 363 40 C 0 00035 25 0 00077 100 25 C 710 5017 7 204 C 0 454 100 C 1 0 150 C 0 505 200 C Silicone Oil Type 66 C v 313 C fl 315 C 50 66 C 0 96 25 C 0 34 100 C 0 0003 0 00095 100 25 C 210 H 14 204 C 1 150 C Heat Transfer Salt 180 C fr 550 C NONE 34 150 C 2 0 150 C 0 33 0 0014 0 00041 1 7 Q cm 5001 6 5 300 C 1 9 300 C 2 4 500 C 1 7 500 C Limiting Factors b boiling point high evaporation fl flash point fr freeze point v viscosity Flash point test open closed cup Very low water solubility ice will form as a slush from condensation below freezing for bath applications Optimum stirring generally occurs at 10 centistokes and below Fume Point A fume hood should be used This point is very subjective in na ture and is impacted by individual tolerance to different fumes and smells how well the bath is covered the surface area of the fluid in the bath the size and ventilation of the facility where the bath is located and other conditions We as sume the bath is well covered at this point This is also subject to company policy Flash Point The point at which ignition may occur The point shown may be either th
9. Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off O gt Ol eH On 6331 Calibration Bath User s Guide Symbol Description Canadian Standards Association Us CATI OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances The European Waste Electrical and Electronic Equipment WEEE Directive C TIC Australian EMC Mark p 2002 96 EC mark 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the terms Warning and Caution Warning identifies conditions and actions that may pose hazards to the user Caution identifies conditions and actions that may damage the instru ment being used 1 2 1 A Warnings To avoid personal injury follow these guidelines GENERAL DO NOT use the instrument for any application other than calibration work The instrument was designed for temperature calibration Any other use of the unit may cause unknown hazards to the user DO NOT use the unit in environments other than those listed in the User s Guide
10. These parameters are pro DB 9 Pin DB 25 Pin grammed within the serial in 1NC e terface menu 2 RxD e 2TxD 3TxD 3RxD To enter the serial parameter ANC 4RTS programming mode first PGND 6NC e 6DSR press EXIT while pressing IRIS 7GND SET and release to enter 8CTS e 8DCD the secondary menu Press 9NC 20DTR SET repeatedly until the Figure 7 Serial Communications Cable Wiring display reads Pr ob E This 57 6331 Calibration Bath User s Guide 58 10 1 2 1 10 1 2 2 10 1 2 3 10 1 2 4 10 1 3 is the menu selection Press UP repeatedly until the serial interface menu is indicated with 5Er 1AL Finally press SET to enter the serial interface pa rameters menu In the serial interface parameters menu are the baud rate sam ple rate duplex mode and linefeed parameters Baud Rate The baud rate is the first parameter in the menu The display prompts with the baud rate parameter by showing BA U 8 Press SET to choose to set the baud rate The current baud rate value is displayed The baud rate of the serial communications may be programmed to 300 600 1200 or 2400 baud The baud rate is pre programmed to 2400 baud Use UP or DOWN to change the baud rate value Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu Sample Period The sample pe
11. 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 need to be restored 65 6331 Calibration Bath User s Guide 66 11 4 in the future The new values Ry and ALPHA are computed by entering the old values for Ry and ALPHA the calibration temperature set points tj and ty and the temperature errors err and erry into the following equations RO ee arena 1 0 lyt 1 ALPHA t err 1 ALPHA t Jerr ty t ALPHA ALPHA For example if RO and ALPHA were previously set for 100 000 and 0 0038500 respectively and the data for t ty errj and erry were as given above then the new values RO and ALPHA would be computed as 100 193 and 0 0038272 respectively 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 re peated again to further improve 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 temperature
12. delicate and must be handled carefully The probe is placed in the small hole in the top of the bath inside the stir motor cover so that the probe tip is fully immersed in the bath fluid The stirring motor is mounted on the bath tank lid It drives the stirring propeller to provide mixing of the bath fluid Proper mixing of the fluid is important for good constant temperature stability A motor cover encloses the motor and probe area A fan draws air through the cover to cool the motor On the bath lid is a large access hole This is used for filling and emptying the bath with fluids and placement of thermometers and devices into the bath When possible the access hole should be covered An access hole cover should be used to cover the access opening in the top of the bath This improves bath temperature stability prevents 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 A stainless steel baffle inside the tank insures proper fluid flow It also protects probes and thermometers from coming in contact with the stir rers There are slots near the bottom of the baffle for insertion of the liq uid in glass adaptor 7 3 Back Panel On the back of the bath there are two systems fuses the power cord drain se rial port IEEE 488 port if installed and
13. 1 11 2 characteristics which are somewhat poorer than water The viscosity changes significantly with temperature and thermal expansion also occurs These oils have very high electrical resistivity Silicone oils are fairly safe and non toxic Silicone oils are fairly expensive Fluid Characteristics Charts Table 2 and Figure 4 on pages 32 and 33 have been created to provide help in selecting a heat exchange fluid media for your constant temperature bath These charts provide both a visual and numerical representation of most of the physical qualities important in making a selection The list is not all inclusive There may be other useful fluids not shown in this listing The charts include information on a variety of fluids which are often used as heat transfer fluid in baths Because of the temperature range some fluids may not be useful with your bath Limitations and Disclaimer The information given in this manual regarding fluids is intended only to be used as a general guide in choosing a fluid Though every effort has been made to provide correct information we cannot guarantee accuracy of data or assure suitablility of a fluid for a particular application Specifications may change and sources sometimes offer differing information Hart Scientific cannot be li able for any personal injury or damage to equipment product or facilities re sulting from the use of these fluids The user of the bath is responsible for collecting correc
14. 1 3 for assistance If initializing the memory does not remedy the problem there may be a failed electronic component Contact a Hart Authorized Service Cen ter see Section 1 3 for assistance The displayed process tempera ture is in error and the controller remains in the cooling or the heating state at any set point value Possible causes may be either a faulty control probe or erroneous data in memory The probe may be disconnected burned out or shorted Check that the probe is connected properly The probe may be checked with an ohmmeter to see if it is open or shorted The probe is a platinum 4 wire Din 43760 type therefore the resistance should read 0 2 to 2 0 ohms between pins 1 and 2 on the probe con nector and 0 2 to 2 0 ohms between pins 3 and 4 The resistance should read from 100 to 300 ohms between pins 1 and 4 depending on the temperature If the probe is defective contact an Authorized Service Center see Section 1 3 for assistance If the problem is not the probe erroneous data in memory may be the cause Re initialize the memory as discussed in the problem The dis play flashes cutout and an incorrect process temperature If the problem remains the cause may be a defective electronic component contact a Hart Authorized Service Center see Section 1 3 for assistance The controller controls or at tempts to control at an inaccurate temperature The controller operates normally except when c
15. Bath Access Hole Cover Fluid Expansion Reservoir with Cover attached to the back of the bath User s Guide RS 232 Cable Report of Test Drain Valve attached to the bath 9930 Interface it Software and User s Guide Tipping Prevention Bracket including mounting hardware for wood or concrete floor 2019 DCB Kit Liquid in Glass LIG Adapter and Carousel Optional 2069 Scope Liquid in Glass LIG with mounts Optional If you are missing any item please call a Hart Scientific Authorized Service Center To locate a Hart Scientific Authorized Service Center near you see Section 1 3 on page 5 11 6331 Calibration Bath User s Guide 4 2 Set Up A WARNING The instrument is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check the flash point boiling point or other fluid characteristic applicable to the circumstances of the instrument operation Ensure that the soft cutout is adjusted to the fluid characteristics of the application As a guideline the soft cutout should be set 10 C to 15 C below the flash point of the bath fluid See Section 8 1 Heat Transfer Fluid for specific information on bath fluids and Section 9 10 Cutout Set up of the bath requires careful unpacking and placement of the bath filling the bath with fluid and connecting power Consult Section 5 Installation for detailed instructions for proper installation of the bath Be sure to place the bat
16. Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Str Baffle Fill Levels e secen be ventro kee eee 13 Tipping Prevention Bracket 18 Front Panel Features RS 23 Chart Showing Usable Range Of Various Fluids 33 Controller Operation 38 Bath Temperature Fluctuation At Various Proportional Band Settings 47 Serial Communications Cable Wiring 57 Calibration 67 vi Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 5 Table 5 International Electrical Symbols 1 Table of Bath Fluids ee RRR 64885244 32 Program Mode Setting Actions 45 Proportional Band Fluid Table 48 Interface Command 61 Interface Command Summary continued 62 Interface Command Summary continued 63 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 AC Alternating Current 7 AC DC Battery A MA CE Complies with European Union Directives DC Double Insulated
17. and frequency prior to energizing the bath 19 6 Bath Use General 6 6 1 6 2 Bath Use A CAUTION Read this section before placing the bath into 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 needs to write their own specific procedures General Be sure to select the correct fluid for the temperature range of the calibration Bath fluids should be selected to operate safely with adequate thermal proper ties to meet the application requirements Also be aware that fluids expand when heated see Section 7 3 1 Fluid Expansion Reservoir Refer to General Operation Section 8 for information specific to fluid selection and to the MSDS sheet specific to the fluid selected Generally baths are set to one tem perature and used to calibrate probes only at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left energized reducing the stress on the system The bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot when re moved from the bath Cautiously handle probes to prevent personal injury Carefully place probes on a heat cold resistant surface or rack until they are at room temperature It is advisable to wipe the probe with a clean soft cloth or paper towe
18. 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 boost heater switch 3 the bath power switch 4 the control buttons and 5 the control indicator light 6331 HIGH PRECISION BATH 40 C to 300 C HEATER BOOST HEATER Figure 3 Front Panel Features 1 The digital display is an important part of the temperature controller It displays the set point temperature and bath temperature as well as the various other bath functions settings and constants The display shows temperatures according to the selected scale units C or F 2 The Boost Heater switch can provide 900 watts of additional bath heat ing power for reduced heating times The Boost Heater switch has two modes as selected by the controller operating parameters menu see Sec tion 9 Controller Operation The default mode is Auto where the heater is automatically activated and turned off as needed 3 The power switch controls power to th
19. cm C however the values are the same for any units of length Divide the value by 1 8 for F coefficients The following equation may be used to find the desired depth Dg Ds K T_ Ts 1 Or Ds Dg K Tg TS 1 where Dg lt The Maximum Fill Depth Where K Expansion coefficient Tg Ending temperature Ts Starting temperature D Ending depth D Starting depth The maximum fill depth is typically 0 5 to 0 8 inches below the level of the gasket at the top of the bath tank not the top of the bath lid Judgement must be made with different stirring arrangements to prevent splashing on the gasket or lid of the bath Example The final depth of Dow Corning 710 silicone oil in the bath tank is to be 9 2 inches when heated from 25 to 300 C What should the starting depth be Expansion coefficient for 710 oil on Table 2 K 0 00077 inch inch C 8 General Operation Heat Transfer Fluid Ending temperature Tg 300 C Starting temperature T 25 C Ending depth Dg 9 2 inches Dg 9 2 0 00077 300 25 1 7 59 inches Electrical Resistivity Electrical resistivity describes how well the fluid insulates against the flow of electric current In some applications such as measuring the resistance of bare temperature sensors it may be important that little or no electrical leakage oc cur through the fluid In such conditions choose a fluid with very high electri cal resistivity Fluid Lifetime Many fluids
20. du plex h alf du h Set serial linefeed mode If eed on of f ON or OFF Set serial linefeed mode to on If eed on lf on Set serial linefeed mode to off If eed of f Ifof Calibration Menu Read calibration parameter 0 0 9 9999 0 0 Set CO calibration parameter ton cO n c0 0 unlimited 62 10 Digital Communication Interface Interface Commands Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Read CG calibration parameter cg cg 999 99 cg 406 25 Set CG calibration parameter ton cg n cg 406 25 unlimited Read Boost Heater mode bo ost bo bo bo auto Set Boost Heater mode bo ost au to us er Auto User Set Boost to Auto mode bo ost au to bo au Set Boost to User manual mode bo ost us er bo us Read low set point limit value tl ow tl tl 999 1 0 Set low set point limit to n tllow n tl 0 0 to 20 C 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 30 to 300 Miscellaneous not on menus Read all parameters all all list of operating parameters Read firmware version number ver sion ver ver 9999 9 99 ver 6331 1 03 Read all extended parameters list of extended parameters Read structure of all commands h elp h list of commands Legend Note Optional Comm
21. e Model Number e Serial Number e Voltage e Complete description of the problem 2 Introduction Introduction The Hart Scientific Model 6331 is a compact constant temperature bath useful in temperature calibration and other applications requiring stable temperatures An innovative state of the art solid state temperature controller has been incor porated which maintains the bath temperature within extreme stability The temperature controller uses a micro controller to execute the many operating functions User interface is provided by the 8 digit LED display and four key switches Digital remote communications is standard with an RS 232 and optional with an IEEE 488 interface The 6331 bath was designed to be compact and low cost without compromising performance The 6331 bath operates over a wide temperature range from 35 C to 300 C The 6331 features e Rapid heating and cooling e RS 232 standard and 488 optional e Temperature scan rate control e Ramp and soak functions e Compact size e Eight set point memory e Adjustable readout in C or F e Automatic boost heat control 3 Specifications and Environmental Conditions Specifications Specifications and Environmental Conditions Specifications Range 35 C to 300 C Stability 2 sigma 0 007 C at 100 C oil 5012 0 010 C at 200 C oil 5017 0 015 C at 300 C 5017 Uniformity 0 007 C at 100
22. operating parameters menu contains the cut out reset mode parameter 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 CkorSk Cutout reset mode parameter Press SET to access the parameter setting The cutout is set at the factory for manual mode Boost Heater Mode A boost heater is activated by the front panel Boost Heater switch The switch must be on for either user mode to function It may be operated in either automatic or manual user modes The default is automatic auto The auto mode will cause the boost heater to come on automatically if the set point is in creased to 5 C above the new current bath temperature When the manual user mode is selected the front panel boost heater switch al lows the user to manually turn the boost heater on and off regardless of temper ature The heater is powered through the same circuit as the control heater and will cycle on and off when the set point is reached Normally it is best to turn off the boost heater when the controller is controlling The heater mode may be selected in the parameters menu The parameter is indicated by 51 6331 Calibration Bath User s Guide 52 9 14 9 14 1 Boost heater mode Press SET to choose the mode The current mode is displayed b f iuto
23. parameters IEEE 488 interface parameters and controller calibration parameters The menus are selected using the UP and DOWN keys and then pressing SET Probe Parameters The probe parameter menu is indicated by Pe GbE 1 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 Sec tion 11 Calibration Procedure 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 skips the parameter and ignors any changes that may have been made RO This probe parameter refers to the resistance of the control probe at 0 C Nor mally this is set for 100 000 ohms 9 Controller Operation Operating Parameters 9 12 2 9 13 9 13 1 9 13 2 ALPHA This probe parameter refers to the average sensitivity of the probe between 0 and 100 C Normally this is set for 0 00385 C Operating Parameters The operating parameters menu is indicated by Operating parameters menu Press UP to enter the menu The
24. temperature is unstable tional band to a narrower width as discussed in Section 9 9 Proportional Band The controller alternately heats The proportional band being too narrow typically causes this oscilla for a while then cools tion Increase the width of the proportional band until the temperature stabilizes as discussed in Section 9 9 Proportional Band The controller erratically heats If both the bath temperature and output power do not vary periodically then cools control is unstable but in a very erratic manner the problem may be excess noise in the system Noise due to the control sensor should be less than 0 001 C However if the probe has been damaged or has developed an inter mittent short erratic behavior may exist Check for a damaged probe or poor connection between the probe and bath Intermittent shorts in the heater or controller electronic circuitry may also be a possible cause Contact an Authorized Service Center see Section 1 3 for assistance Comments EMC Directive The instrument was designed specifically as a test and measuring device Com pliance to the EMC directive is through IEC 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements 1998 As noted in the IEC 61326 1 the instrument can have varying configurations The instrument was tested in a typical configuration with shielded RS 232 cables Immunity Testing The instrument was tested for laboratory
25. temperature limits contains ice particles or is close to a chemical breakdown Once data has been gathered a specific maintenance schedule can be outlined for the instrument Refer to General Operation Section 8 for more information about the different types of fluids used in calibration baths e Ifa hazardous material is spilt on or inside the equipment the user is re sponsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material MSDS sheets ap plicable to all fluids used in the baths should be kept in close proximity to the instrument 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 69 6331 Calibration Bath User s Guide 70 questions call a Hart Authorized Service Center see Section 1 3 for more information Before using any cleaning or decontamination method except those rec ommended by Hart users should check with a Hart Authorized Service Center see Section 1 3 to be sure that the proposed method does not damage the equipment If the instrument is used in a manner not in accordance with the equip ment design the operation of the bath may be impaired or safety hazards may arise The over temperature cutout should be checked every 6 months to see that itis working properly In order to check the user selected cutout follow the controller directio
26. 4 F 5 C to 40 C Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument When filling the tank ensure the heating coils are completely covered DO NOT fill above the stir baffle see Figure 1 on page 13 DO NOT overfill the bath Overflowing fluid may damage the electrical system Be sure to allow for thermal expansion of the fluid as the bath temperature increases See Section 5 5 Bath Preparation and Filling for specific instructions Read Section 6 Bath Use before placing the unit into service DO NOT turn on the bath without fluid in the tank and the heating coils fully immersed See Section 7 3 1 Fluid Expansion Reservoir for infor mation on fluid expansion reservoir use 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 The Factory Reset Sequence should be performed only by authorized personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Test to restore the test pa rameters DO NOT operate this instrument in an excessively wet oily dusty or dirty environment Silicon oil can condense on the bath during normal operation See Section 12 Maintenance for cleaning instructions 1 Before You Start Authorized Service Centers 1 3 e Most probes have hand
27. 8 parameter menu The IEEE 488 menu contains the IEEE 488 ad dress parameter Address The IEEE 488 address is prompted with Addr 5 5 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 Transmission Termination The IEEE 488 transmission termination is prompted with EOS Press SET to access the termination character The present setting is displayed Press UP or DOWN to change the setting Press SET to save the new selection 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 5 These commands are used 59 6331 Calibration Bath User s Guide 60 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 Cr ASCII 13 The interface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the mini mum nu
28. Current mode setting Select the mode with UP or DOWN then press SET to accept the desired mode Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SErIRL Serial RS 232 interface parameters menu The serial interface parameters menu contains parameters which determine the operation of the serial interface The parameters in the menu are baud rate sample period duplex mode and linefeed Baud Rate The baud rate is the first parameter in the menu The baud rate setting deter mines the serial communications transmission rate The baud rate parameter is indicated by Serial baud rate parameter Press SET to choose to set the baud rate The current baud rate value is displayed Current baud rate The baud rate of the bath serial communications may be programmed to 300 600 1200 or 2400 BAUD Use UP or DOWN to change the BAUD rate value New baud rate Press SET to set the baud rate to the new value or EXIT to abort the opera tion and skip to the next parameter in the menu 9 Controller Operation Serial Interface Parameters 9 14 2 9 14 3 9 14 4 Sample Period The sample period is the next parameter in the serial interface parameter menu The sample period is the time period in seconds between temperature measure ments transmitted from the serial interface If the sample rate is set to five the bath transmits the current measu
29. able 39 9 3 2 Setpoint Values Re ee AH ake 40 9 3 3 Verma Si ay seeds aie ha eae ut eee cae we ee nee 40 SCAM Go Gk EE E e 41 9 4 1 Scan Control ae Gi e See e Sh Pr Grane 41 9 4 2 TCI 41 Temperature Scale Units leen 42 Ramp and Soak Program 43 9 6 1 Number of Program 43 9 6 2 d eds Say Waar ae de qup d abd s 43 9 6 3 Program Soak Time ssor e ack us 44 9 6 4 Program Function Mode 44 9 6 5 Program cdo bbe ee de ae aloe Bee a 45 9 7 Secondary 45 9 8 Heater POWer ix ears Re Re RO we a 45 9 9 Proportional 46 910 Cutouts cde xp ee ks ee es REDE ta E we ae 49 9 1 Controller Configuration 50 9 12 Probe Parameters 222222555526 roe Mare 50 9 12 1 R EV EER ee OE de qe x 3X 50 9 12 2 ALPHA uude BO DC 51 9 13 Operat ngParameters
30. alibrated temperature range but the calibration error will also be greater over that range For example 50 C and 150 C are chosen as the calibration temperatures the bath may possibly 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 accuracy of 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 chosen calibration temperatures First set the bath to the lower set point t Wait for the bath to reach the set point and allow 15 minutes to stabilize at that temperature Check the bath stability with a ther mometer When both the bath and the thermometer have stabilized measure the bath temperature with the thermometer and compute the temperature error the actual bath temperature minus the set point temperature err If the bath is set for a lower set point of t 50 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 and after stabilizing measure the bath temperature and compute the error erry For our example the bath was set for 150 C and the thermometer measured 150 1 C giving an error of 0 1 C Computing RO and ALPHA Before computing the new values for R and ALPHA the current values must
31. am menu is the number of set points to cycle through Up to 8 set points can be used in a ramp and soak program These set points are independent from the programmable set points described in Sec tion Programmable Set points 8 i Number of program set points Press SET to continue Press EXIT to ignore any changes and to continue SET Save new setting Set points The next parameters are the program set points First set point 43 6331 Calibration Bath User s Guide 44 9 6 3 9 6 4 Use the UP or DOWN buttons to select any of the set points 3 30 0 Third set point Press SET to save the new set point value The other set points can also be set in the same manner Once the set points are programmed as desired press EXIT to continue Continue to next menu function Program Soak Time The next parameter in the program menu is the soak time This is the time in minutes that each program set point is maintained after settling before pro ceeding to the next set point The duration is counted from the time the temper ature reaches the set point Press SET to continue Save new setting Program Function Mode The next parameter is the program function or cycle mode There are four pos sible modes which determine whether the program scans up from set point 1 to n only or both up and down from set point n to 1 and also whether the program stops after o
32. and 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 63 11 Calibration Procedure Calibration Points 11 11 1 11 2 11 3 Calibration Procedure In some instances the user may want to calibrate the bath to improve the tem perature set point accuracy Calibration is done by adjusting the controller probe calibration constants Ry and ALPHA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set point The thermometer used must be able to measure the bath fluid temper ature with higher accuracy than the desired accuracy of the bath By using a good thermometer and carefully following procedure the bath can be calibrated to an accuracy of better than 0 02 C over a range of 100 degrees Calibration Points In calibrating the bath 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 that are just within the most useful operat ing range of the bath The further apart the calibration temperatures the greater the c
33. and should be wider when the fluid viscosity is higher because of the increased response time and also when noise is greater The proportional band width is easily adjusted from the bath front panel The width may be set to discrete values in degrees C or F depending on the selected units The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the control ler percent output power display Narrow the proportional band width to the point at which the bath temperature begins to oscillate and then increase the band width from this point to 3 or 4 times wider Table 4 lists typical propor tional band settings for optimum performance with a variety of fluids at se lected temperatures 47 6331 Calibration Bath User s Guide 48 Table 4 Proportional Band Fluid Table Fluid Temperature Proportional Band Stability Water 30 0 C 0 2 C 0 003 C Water 60 0 C 0 2 C 0 003 C Eth Gly 50 35 0 C 0 05 C 0 001 C Eth Gly 50 60 0 C 0 05 C 0 001 C Eth Gly 50 100 0 C 0 1 C 0 007 C Oil 200 10 35 0 C 0 6 C 0 004 C Oil 200 10 60 0 C 0 6 C 0 004 C Oil 200 10 100 C 0 6 C 0 005 C Oil 710 200 C 0 4 C 0 01 C The proportional band adjustment may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional ban
34. cal gradients these gradients are minimized inside the bath work area Nevertheless probes should be inserted to the same depth in the bath fluid 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 20 x the diameter of the UUT the sensor length Do not submerge the probe handles If the probe handles get too warm dur ing calibration at high temperatures a heat shield could be used just below the probe handle This heat shield could be as simple as aluminum foil slid over the probe before inserting it in the bath or as complicated as a specially designed reflective metal apparatus When calibrating over a wide temperature range better results can generally be achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The ob ject is to keep the reference probe and the probe s to be calibrated as closely grouped as possible in the working area of the bath Bath stability is maximized when the bath working area is kept covered In preparing to use the bath for calibration start by e Placing the reference probe in the bath working area e Placing the probe to be calibrated unit under test or UUT in the
35. case the user may set the interface address and the transmission termination charac ter within the IEEE 488 parameter menu This menu does not appear on baths not fitted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Press SET to enter the menu Address The IEEE 488 interface must be configured to use the same address as the ex ternal communicating device The address is indicated by Adjust the value with UP or DOWN and then use SET to set the address to the displayed value Add 15 New IEEE 486 interface address Transmission Termination The transmission termination character can be set to carriage return only line feed only or carriage return and linefeed Regardless of the option selected the instrument interprets either a carriage return or a linefeed as a command termi nation during reception The termination parameter is indicated with EGS IEEE 488 termination Press SET to access the termination setting 9 Controller Operation Calibration Parameters 9 16 9 16 1 9 16 2 9 16 3 Present IEEE 488 termination Use SET to save the new selection Calibration Parameters The operator of the bath controller has access to a number of the bath calibra tion constants namely CTO CG and L These values are set at the fac tory and must not be altered The correct values are important to the accuracy and proper and safe
36. d Access heater power in secondary menu Heater power in percent To accept the new setting and access the cutout set point press SET Pressing EXIT exits the secondary menu ignoring any changes just made to the pro portional band value 9 Controller Operation Cutout 9 10 SET Accept the new proportional band setting Cutout As a protection against software or hardware fault shorted heater triac or user error the bath is equipped with an adjustable heater cutout device that shuts off power to the heater if the bath temperature exceeds a set value This protects the heater and bath materials from excessive temperatures and most impor tantly protects the bath fluids from being heated beyond the safe operating temperature preventing hazardous vaporization breakdown or ignition of the liquid The cutout temperature is programmable by the operator from the front panel of the controller It must always be set below the upper temperature limit of the fluid and no more than 10 degrees above the upper temperature limit of the bath If the cutout is activated because of excessive bath temperature then power to the heater is shut off allowing the bath to cool The display will flash Cut ouk and the message will be sent over the communications ports The bath cools until it reaches a few degrees below the cutout set point temperature At this point the action of the cutout is determined by the s
37. d by rolling it into place Do not attempt to carry the bath DO NOT move a unit filled with fluid see Section 5 1 Moving or Uncrating the Bath BURN HAZARD e Extremely cold temperatures may be present in this equipment Freezer burns and frostbite may result if personnel fail to observe safety precau tions e High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions e The drain tube and dust cover of the fluid expansion reservoir may be hot Handle them carefully and always be sure the drain tube is fully inserted into the elbow of the dust cover e The drain tube of the fluid expansion reservoir is not designed to handle large flow rates encountered by overfilling the tank It is intended for ex panding fluid rates from heating only Fill the tank only until the level reaches the top of the baffle see Figure 1 on page 13 ELECTRICAL HAZARD e These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged into a 115 VAC 60Hz 230 VAC 50Hz optional AC only electric outlet 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 ordi nances Consult a q
38. degrade over time because of vaporization water absorption gel ling or chemical breakdown Often the degradation becomes significant near the upper temperature limit of the fluid substantially reducing the fluid s lifetime Safety When choosing a fluid always consider the safety issues associated Obviously where there are extreme temperatures there can be danger to personnel and equipment Fluids may also be hazardous for other reasons Some fluids may be considered toxic Contact with eyes skin or inhalation of vapors may cause injury A proper fume hood must be used if hazardous or bothersome vapors are produced WARNING Fluids at high temperatures may pose danger from BURNS FIRE and TOXIC FUMES Use appropriate caution and safety equip ment Fluids may be flammable and require special fire safety equipment and proce dures An important characteristic of the fluid to consider is the flash point The flash point is the temperature where there is sufficient vapor given off that when adequate oxygen is present and an ignition source is applied the vapor ig nites This does not necessarily mean that fire is sustained at the flash point The flash point may be either of the open cup or closed cup type Either condi tion may occur in a bath situation The open cup flash point is measured under the condition of vapors escaping the tank The closed cup flash point is mea sured with the vapors being contained within the tank Since oxyge
39. e entire bath including the stirring motor 4 The control buttons SET DOWN 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 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 23 6331 Calibration Bath User s Guide 5 EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value are ignored The control indicator is a two color light emitting diode LED This in dicator lets the user visually see the ratio of heating to cooling When the indicator is red the heater is on and when it is green the heater is off and the bath is cooling 7 2 Bath Tank and Lid The bath tank and lid assembly includes the tank the control probe the stir ring motor and cover the access hole and the access hole cover 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 tempera tures The control probe provides the temperature feedback signal to the con troller allowing the controller to maintain a constant temperature The control probe is a precision platinum resistance thermometer PRT It is
40. e front panel LED display indicates the actual bath temperature Setting the Temperature In the following discussion and throughout this manual a solid box around the word SET UP DOWN or EXIT indicates the panel button to press while the dotted box indicates the display reading on the front panel Explanation of the button function or display reading is written at the right 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 i Bath temperature display When SET is pressed the display shows the set point memory that is cur rently being used and its value Eight set point memories are available Access set point selection l 950 Set point 1 25 0 C currently used Press SET to select this memory and access the set point value Access set point value C 25 00 i Current value of set point 1 25 00 C Press SET to accept the new value and display the vernier value The bath be gins heating or cooling to the new set point SET Store new set point access vernier 4 Quick Start Setting the Temperature The bath heats or is allowed to cool until it reaches the new set point temperature 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 10 Cutout To obtain optimum control stab
41. e open or closed cup flash point Refer to the flash point discussion in Section 8 1 8 Safety 32 8 General Operation Heat Transfer Fluid 100 arc 100 C 200 C 300 C 400 C 500 C 600 C Silicone Oil 5017 FL 302 C Silicone Oil 5014 FL 280 C Silicone Oil 5013 FL 232 C Silicone Oil 5012 FL 211 C Silicone Oil 5010 HFE 7500 5023 Halocarbon 5019 Mineral Oil 5011 FL 177 C Water Methanol Ethanol Ethylene Glycol 50 50 with H20 5020 Dynalene HF LO 9 Bath Salt 5001 O O O Decomposition Starts Shaded area represents usable range of fluid starting at BP Boiling Point 50 centistokes Lighter shading represents decreasing CS Centistokes viscosity while vaporization and decomposition increase iinet ae Point Black area represents liquid range with excessive due tolevaporation m FL Flash Point viscosity FR Freeze Point PP Pour Point Range over which a fume hood is recommended Figure 4 Chart Showing Usable Range Of Various Fluids Boiling Point At or near the boiling point of the fluid the temperature stabil ity is difficult to maintain Fuming or evaporation is excessive Large amounts of heater power may be required because of the heat of vaporization Decomposition The temperature may reach a p
42. eds 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 Remote digital operation with the controller is possible via the standard RS 232 serial port The control ler may be optionally equipped with an IEEE 488 GPIB digital interface Oper ation of the controller using the front control panel is discussed in Section 9 Controller Operation Operation using the digital interfaces is discussed in Sec tion 10 Digital Communication Interface When the controller is set to a new set point the bath heats or cools to the new temperature Once the new temperature is reached the bath usually takes 10 15 minutes for the temperature to settle and stabilize There may be a small over shoot or undershoot of about 0 5 C 35 9 Controller Operation Bath Temperature 9 1 9 2 Controller Operation This section discusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key switches and LED dis play the user may monitor the bath temperature set the temperature set point in degre
43. er Votar e cen ao 58 10 1 3 Serial Operatiom se vado xe opa c xod erede ode 58 10 2 JEEE 488 Communication optional 59 10 2 1 Setup var es Wer vndis qu nad Nr quar dn qu 59 l10 2 L Address ome ew me er OX NC XO RR XR EUR EC Rm 59 10 2 1 2 Transmission Termination 22 2 59 10 2 2 Operation die oo ewe ode 59 103 Interface Commands 59 11 Calibration 65 1 1 Calibration Points s 65 11 2 Measuring the Set point Error 1 65 11 3 Computing 65 iv 11 4 Calibration Example 66 12 Maintenance 69 13 71 131 71 13 2 Voce pow osos 73 13 21 EMC Directives a Sep e RASA 73 18 2 1 4 Immunity Testing 225255555554 73 19212 Emission Testing do RE Um RENTE dnos 73 13 2 2 Low Voltage Directive 73 Figures Figure 1 Figure 2
44. er Slots Figure 2 Tipping Prevention Bracket Installation Installation On A Concrete Floor Using 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 Screw the bracket securely to the floor Installation Of The Bath Slide the back casters of the bath completely into the bracket caster slots see Figure 2 Lock the front casters of the bath Check that the bath is securely locked into the bracket by gently pushing on the bath Proceed to fill the bath with the applicable bath fluid after reading the entire User s Guide 5 Installation Dry out Period 5 4 5 5 5 6 If you have any questions concerning installation of the tipping prevention bracket please contact a Hart Authorized Service Center Dry out Period If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired Before initial use or after transport or after storage in humid or semi humid environments or anytime the bath has not been energized for more than 10 days the
45. es 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 of the primary functions is summa rized in Figure 5 on page 38 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 25 00 L 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 cut oct cutout 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 deter mines 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 cutout must be reset by the operator after the temperature falls below the set point When the cutout is active and the cutout mode is set to manual
46. etting of the cutout mode parameter The cutout has two modes automatic reset or manual reset If the mode is set to automatic then the cutout automatically resets itself when the bath temperature falls below the reset temperature If the mode is set to manual then 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 scx Access heater power in secondary menu SET SET CG 210c To change the cutout set point press UP or DOWN 49 6331 Calibration Bath User s Guide 50 9 11 9 12 9 12 1 Decrement display CO 95C i New cutout set point 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 The display prompts with n F16 Press SET once more There are five sets of configuration parameters probe parameters operating parame ters serial interface
47. h Envitonmernt 4 64 02 6644 22454 oe ea a ek 17 5 3 Tipping Prevention Bracket Installation 17 5 3 1 Installation A Wood Floor 18 532 Installation On Concrete 18 5 3 3 Installation Of Th Bath RR RE ES 18 5 4 Drysout Period 2 2 4 BM as Coe Se SO s 19 5 5 Bath Preparation and Filling 19 5 6 loj T 19 6 21 6 1 General 5 5 658446 SESE RSLS 21 6 2 Comparison 21 6 3 Calibration of Multiple Probes 22 ii 7 Parts and 23 7 1 7 2 7 3 Front Panel ss ee See EX 23 Bath Tank and Lido 225222225 24 Back Panel des soi mue 24 73 1 Fluid Expansion Reservoir lt o csc a ca cos caca oe da ai caa d caa ii 25 8 General Operation 27 8 1 8 2 8 3 8 4 8 5 Heat Transfer p RO Ge eae 27 8 1 1 Temperature Range i usos e e SPD TR RR 27 8 1 2 VISCOSITY bck coed BOR 27 8 1 3 Specific Heat v ce 27 8 1 4 Thermal
48. h in a safe clean and level location Refer to Section 5 3 Tipping Prevention Bracket Installation Fill the bath tank with an appropriate fluid For operation at moderate bath tem peratures clean distilled water works well Carefully pour the fluid into the bath tank through the large rectangular access hole above the tank avoiding spilling any fluid 4 Quick Start Set Up CAUTION When filling the tank ensure the heating coils are completely covered DO NOT FILL ABOVE THE STIR BAFFLE See Figure 1 Maximum Fill Level Top of Baffle Minimum Fill Level Line Figure 1 Stir Baffle Fill Levels An overflow drain is provided for excess bath fluid due to expansion This drains the fluid into the fluid expansion reservoir for reuse See Section 7 3 1 Fluid Expansion Reservoir for details in using the reservoir NOTE As the temperature of the bath increases the fluid level will in crease see Section 6 on page 21 13 6331 Calibration Bath User s Guide 4 3 4 4 Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability Refer to Section 3 1 Specifications for details Turn the bath on using the front panel POWER switch The bath begins to heat or cool to reach the previously programmed tempera ture set point Th
49. he EXIT button If the cutout is still in the over temperature fault condition the display continues to flash cutout The bath temperature must drop a few degrees below the cutout set point before the cutout can be reset Temperature Set point The bath temperature can be set to any value within the range as given in the specifications with a high degree of resolution The temperature range of the particular fluid used in the bath must be known by the operator and the bath should only be operated well below the upper temperature limit of the fluid In addition the cutout temperature should also be set below the upper limit of the fluid Setting the bath temperature involves three steps 1 select the set point mem ory 2 adjust the set point value and 3 adjust the vernier if desired Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the bath to a previously programmed temperature To set the bath temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set point memory currently being used is shown at the left on the display followed by the current set point value 25 00 Bath temperature in degrees Celsius To change the set point memory press UP or DOWN Increment memory 39 6331 Calibration Bath
50. he heater on for a certain amount of time using a solid state relay The front panel red green control indicator shows the state of the heater The control indicator glows red when the heater is on and glows green when the heater is off The indicator pulses constantly when the bath is maintaining a sta ble temperature Temperature Controller The bath temperature is controlled by Hart Scientific s unique hybrid digi tal analog temperature controller The controller offers the tight control stability of an analog temperature controller as well as the flexibility and programmabil ity of a digital controller The bath temperature is monitored with a platinum resistance sensor in the con trol probe The signal is electronically compared with the programmable refer ence signal amplified and then passed to a pulse width modulator circuit which controls the amount of power applied to the bath heater The bath is operable within the temperature range given in the specifications For protection against solid state relay failure or other circuit failure the microcontroller automatically turns off the heater with a second mechanical re lay anytime the bath temperature is more than a certain amount above the set point temperature As a second protection device the controller is equipped 8 General Operation Temperature Controller with a separate thermocouple temperature monitoring circuit which shuts off the heater if the temperature exce
51. ier 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 9 Controller Operation Scan 9 4 9 4 1 9 4 2 Increment display 0 00090 1 New vernier setting Next press EXIT to return to the temperature display or SET to access the temperature scale units selection SET Access scale units Scan The scan rate can be set and enabled so that when the set point is changed the instrument heats or cools at a specified rate degrees per minute until it reaches the new set point With the scan disabled the instrument heats or cools at the maximum possible rate Scan Control The scan is controlled with the scan on off function that appears in the main menu after the set point function Scan function off Press SET to accept the present setting and continue SET Accept scan setting Scan Rate The next function in the main menu is the scan rate The scan rate can be set from 0 001 to 5 0 C min The maximum scan rate however is actually limited by the natural heating or cooling rate of the instrument This is typically less than 2 5 C min especially when cooling The scan rate function appears in the main menu after the scan control function The scan rate units are in degrees per minute degrees C or F dependi
52. ility adjust the proportional band as discussed in Section 9 9 Proportional Band 15 5 Installation Moving or Uncrating the Bath 5 5 1 5 2 5 3 Installation A CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the war ranty Moving or Uncrating the Bath The bath is equipped with casters and should be rolled It is not equipped with handles and is not designed to be lifted When uncrating the bath remove all of the accessories from the packing foam around the bath Remove the pre formed foam Gently ease the bath from the crate using the casters to roll the bath If it is required to lift the bath slightly to release it from the crate two people should carefully slide their hands under the bath and gently lift the bath only enough to clear the packing foam and roll the bath from the crate The area containing the compressor will be heavier than the rest of the bath If it is required to move the bath after installation empty the bath of fluid DO NOT move a bath filled with fluid Unlock the casters and roll the bath Do not attempt to carry the bath It is tall and heavy and is not provided with handles Personal injury or damage to the bath may occur Bath Environment The Model 6331 Bath is a precision instrument which should be located in an appropriate environment The location should be free of drafts extreme temper atures and tem
53. instrument needs to be energized for a dry out period of 2 hours be fore 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 temperature chamber operating at 50 C for 4 hour or more Bath Preparation and Filling The Model 6331 Bath is not provided with a fluid Various fluids are available from Hart Scientific and other sources Depending on the desired temperature range any of the following fluids as well as others may be used in the bath e Water e Ethylene glycol water e Mineral oil e Silicone oil Fluids are discussed in detail in Section 8 1 Heat Transfer Fluid Remove any access hole cover from the bath and check the tank for foreign matter dirt remnant packing material etc Fill the bath with clean unpolluted fluid Fill the bath carefully through the large square access hole to a level that allows for stirring and thermal expan sion Section 8 1 5 Thermal Expansion explains fluid expansion Power With the bath power switch off plug the bath into an AC mains outlet on the appropriate voltage frequency and current capacity Refer to Section 3 13 1 Specifications for power details Refer to and read the CAUTION at the front of the manual concerning brown out and over voltage protection Check the back label for the correct voltage
54. it Point centistokes Gravity cal g C 10 20 Halocarbon 0 8 100 C v 70 e 5 7 50 C 1 71 0 40 C 0 2 0 0004 0 0011 5019 0 8 40 C 0 5 70 C Methanol 96 fr 10 C fl cc 12 C 1 3 35 C 0 810 8 0 C 0 6 0 0005 20 0 0014 25 C 0 66 0 C 0 792 20 C 0 45 20 C Water 0 C fr 95 C b NONE 1 25 C 1 00 1 00 0 0014 0 0002 25 C 0 4 75 C Ethylene 30 C fr 90 C b NONE 7 0 C 1 05 0 8 80 0 001 Glycol 50 5020 2 50 C 0 7 100 C Mineral Oil No 7 10 C v 166 C fl 168 C 15 75 C 0 87 25 C 0 48 25 C 0 00025 25 0 0007 50 C 5 25 C 5011 5 125 C 0 84 75 C 0 53 75 C 0 81 125 C 0 57 125 C Silicone Oil Type 40 C v 130 C fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 25 C 0 00105 1000 25 C 200 05 5010 10 150 C Silicone Oil Type 30 C v 209 C fl cc 211 C 10 25 C 0 934 25 C 0 43 40 C 0 00032 25 0 00108 1000 25 C 200 10 5012 3 135 C 0 45 100 C 50 150 C 0 482 200 C Silicone Oil Type 10 C v 230 C fl 232 C 20 25 C 0 949 25 C 0 370 40 C 0 00034 25 C 0 00107 1000 25 C 200 20 5013 0 393 100 C 50 150 C 0 420 200 C Silicone Oil Type 30 C v 278 C fl 280 C 50 25 C 0 96 25 C 0 4 0 00037 25 0 00104 1000 25 C 200 50 5014 50 150 C Silicone Oil Type 70 C v 230 C fl 232 C 50 70 C 1 07 25
55. l before inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid salt carefully wash the probe in warm water and dry completely before transferring it to another fluid Always be sure that the probe is completely dry before in serting it into a hot fluid Some of the high temperature fluids react violently to water or other liquid mediums Be aware that cleaning the probe can be danger ous if the probe has not cooled to room temperature Additionally high temper ature fluids may ignite the paper towels if the probe has not been cooled For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature Comparison Calibration Comparison calibration involves testing a probe unit under test UUT against a reference probe After inserting the probes to be calibrated into the bath al low sufficient time for the probes to settle and the temperature of the bath to stabilize One of the significant dividends of using a bath rather than a dry well to cali brate multiple probes is that the probes do not need to be identical in construc tion The fluid in the bath allows different types of probes to be calibrated at the same time However stem effect from different types of probes is not to 21 6331 Calibration Bath User s Guide 22 6 3 tally eliminated Even though all baths have horizontal and verti
56. late Specific Heat Specific heat is the measure of the heat storage ability of the fluid Specific heat to a small degree affects the control stability It also affects the heating and cooling rates Generally a lower specific heat means quicker heating and 27 6331 Calibration Bath User s Guide 28 8 1 4 cooling The proportional band may require some adjustment depending on the specific heat of the fluid Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid Ther mal conductivity of the fluid affects the control stability temperature unifor mity and temperature settling time Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance Thermal Expansion Thermal expansion describes how much the volume of the fluid changes with temperature Thermal expansion of the fluid must be considered since the in crease in fluid volume as the bath temperature increases may cause overflow into the fluid expansion reservoir see Section 7 3 1 Fluid Expansion Reser voir for how to use this It may also cause loss of valuable bath fluid Exces sive thermal expansion may also be undesirable in applications where constant fluid level is important Thermal expansion coefficients of several fluids are shown in Table 2 Table of Bath Fluids Fluid manufacturers can also provide this information The ther mal expansion coefficients are shown in units of cm
57. le temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the instrument e 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 Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk G fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 5 12 3436 Telefax 86 10 6 5 12 3437 6331 Calibration Bath User s Guide E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available
58. leen 51 9 13 1 Cutout Reset aa aua pa eh 51 9 13 2 Boost Heater Modes sh ok he EK Oo x coe 31 9 14 Serial Interface Parameters 52 9 14 1 Baud Rates oe BAAS Aha eh AMAA EEO oom ay 52 9 14 2 Sample ux Aa g BAe Bae eR 53 9 14 3 Duplex Mode xke ee dq RENEE e Wd dS 53 9 14 4 v aq dope Pep OP Rd 53 9 15 IEEE 88Parameters 54 9 15 1 nuin Kg OE 54 9 15 2 Transmission Termination 64 44 XE X 54 9 16 Calibration Parameters 55 9 16 1 CITO due whe eee eS EES HS 55 9 16 2 CO and CG 355555554555 WEES eoe me EER HERES 55 9 16 3 fle ea 55 10 Digital Communication Interface 57 10 1 1 57 10 1 1 wx css o 30x Wee C9 S esso 57 10 1 2 xa Ga RA TROP Nob GU oe ede RW Ee a obe 57 10 02 1 Rate aoe Seo E a Osce Ese UR URGE LR 58 10122 Campe Pona ee oS eedem eR 58 10 1 2 3 Duplex Mode iuo up oe Ro SR ROS ECT OR SUR 58 10 11 24 Ennefegd que oS v
59. locations Criterion B was used for Radiated RF IEC 61000 4 3 and Voltage dips short interruptions and voltage immunity tests 61000 4 11 Criterion was used for Electrostatic Dis charge ESD IEC 61000 4 2 If the instrument is subjected to ESD conditions the instrument may require the user to cycle the power to return to normal operation Emission Testing The instrument fulfills the limit requirements for Class A equipment but does not fulfill the limit requirements for Class B equipment The instrument was not designed to be used in domestic establishment Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC Hart Scientific equipment has been designed to meet the IEC 1010 1 EN 61010 1 and the IEC 1010 2 010 EN 61010 2 010 standards 73
60. mber of letters which determines a unique command A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example s CR returns the current set point and s 50 00 CR sets the set point set point 1 to 50 00 degrees In the following list of commands characters or data within brackets and are optional for the command A slash denotes alternate characters or data Numeric data denoted by may be entered in decimal or exponential notation Characters are shown in lower case although upper case may be used Spaces may be added within command strings and 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 5 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 300 Instrument tlemperature n t 300 Range 0 to 300 Read vernier v ernier V v 9 99999 v 0 00000 Set vernier to n v ernier n v 00018 Depends on Configuration Read scan function sc an SC scan ON o
61. mines how often the maintenance will have to be performed Simply wipe down the oily areas of the bath with a mild degreaser such as 4099 Do not spray the degreaser directly on the bath Spray the degreaser on a cloth and wipe the bath down with the cloth Re peat the process as often as necessary to keep the oil from collecting on the bath If oil is allowed to collect on the bath it may run into the bath and collect on the interior of the bath causing internal damage that may affect the lifetime of the instrument 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 conditions in which the equipment is used A schedule cannot be outlined to meet each set of conditions Therefore the bath should be checked weekly and adjustments made as required e Heat transfer medium lifetime is dependent upon the type of medium and the conditions of use The fluid should be checked at least every month for the first year and regularly thereafter This fluid check provides a baseline for knowledge of bath operation with clean usable fluid Once some fluids have become compromised the break down can occur rap idly Particular attention should be paid to the viscosity of the fluid A sig nificant change in the viscosity can indicate that the fluid is contaminated being used outside of its
62. n an excessively dusty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions e temperature range 5 40 41 104 F e ambient relative humidity maximum 8046 for temperatures 31 C de creasing linearly to 5096 at 40 e pressure 75kPa 106kPa e mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized e altitude less than 2 000 meters e indoor use only Warranty Fluke Corporation Hart Scientific Division Hart warrants this product to be free from defects in material and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment This warranty extends only to the original purchaser and shall not apply to any product which in Hart s sole opinion has been subject to misuse alteration abuse or abnormal conditions of operation or handling Software is warranted to operate in accordance with its programmed instruc tions on appropriate Hart products It is not warranted to be error free Hart s obligation under this warranty is limited to repair or replacement of a product which is returned to Hart within the warranty period and is determined upon examination by Hart to be defective If Hart determines that the defect or malfunction has been caused by misuse alteration abuse or abnormal co
63. n and an ig nition source are less available inside the tank the closed cup flash point is lower than the open cup flash point Environmentally hazardous fluids require special disposal according to applica ble federal or local laws after use 29 6331 Calibration Bath User s Guide 30 8 1 9 8 1 10 8 1 10 1 8 1 10 2 8 1 10 3 8 1 10 4 Cost Cost of bath fluids may vary greatly from cents per gallon for water to hun dreds of dollars per gallon for synthetic oils Cost may be an important consid eration when choosing a fluid Commonly Used Fluids Below is a description of some of the more commonly used fluids and their characteristics Water Water is often used because of its very low cost its availability and its excel lent temperature control characteristics Water has very low viscosity and good thermal conductivity and heat capacity which makes it among the best fluids for good control stability at lower temperatures Temperature stability is much poorer at higher temperatures because water condenses on the lid cools and drips into the bath Water is safe and relatively inert The electrical conductivity of water may prevent its use in some applications Water has a limited tempera ture range from a few degrees above 0 to a few degrees below 100 C At higher temperatures evaporation becomes significant Water used in the bath should be distilled or deionized to prevent mineral deposits Consider u
64. ndi tions or operation or handling Hart will repair the product and bill the pur chaser for the reasonable cost of repair To exercise this warranty the purchaser must forward the product after calling or writing a Hart Authorized Service Center see Section 1 3 for authorization The Service Center assumes NO risk for in transit damage THE FOREGOING WARRANTY IS PURCHASER S SOLE AND EXCLU SIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EX PRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR MECHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR USE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAM AGES OR LOSS WHETHER IN CONTRACT TORT OR OTHERWISE 4 Quick Start Unpacking 4 4 1 Quick Start CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the war ranty This section gives a brief summary of the steps required to set up and operate the 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 Installation through Section 8 General Operation 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 immedi ately Verify that all components are present 6331
65. ne cycle or repeats the cycle indefinitely Table 3 below shows the action of each of the four program mode settings i Program mode Use the UP or DOWN buttons to change the mode 9 Controller Operation Secondary Menu 9 6 5 9 7 9 8 i New mode Press SET to continue Table 3 Program Mode Setting Actions Function Action 1 up stop 2 up down stop 3 up repeat 4 up down repeat SET Enter program menu Program Control The final parameter in the program menu is the control parameter Three op tions are available for controlling the ramp and soak program The options are to start the program from the beginning 60 continue the program from where it was when it was stopped nt or stop the program OFF Pr OGFF Program presently off Press SET to activate the new program control command and return to the temperature display SET Activate new command Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simulta neously and then releasing The first function in the secondary menu is the heater power display 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 Thi
66. ned Acceptable Command Description Format Example Returned Example Values Read program function pf pf pf 9 pf 3 Set program function to n pf 2 1104 Secondary Menu Read proportional band setting pr op band pr pb 9 999 pb 0 326 Set proportional band to n pr op band n pr 0 326 Depends on Configuration Read cutout setting c utout 999 c 310 C in Set cutout setting c utout n r eset Set cutout to n degrees c utout n c 300 Temperature Range 0 to 300 Reset cutout now c utout r eset c r Read heater power po wer po po 999 po 1 duty cycle Configuration Menu Probe Menu Read RO calibration parameter 0 r r0 999 999 r0 100 578 Set RO calibration parameter ton r 0 n r 100 324 98 0 to 104 9 Read ALPHA calibration al pha al al 9 9999999 al 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 auto Set cutout mode cm ode zr eset a uto RESET or AUTO Set cutout to be reset manually cm ode r eset cm r Set cutout to be reset cm ode a uto cm a automatically Serial Interface Menu Read serial sample setting sa mple sa sa 9999 sa 1 Set serial sampling setting ton 5 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
67. ng on the selected units Scan rate in C min Press UP or DOWN to change the scan rate 41 6331 Calibration Bath User s Guide 42 9 5 Sr 2 0 New scan rate Press SET to accept the new scan rate and continue 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 85 00 3 Bath temperature Press SET to accept the new selection and resume displaying the bath temperature 9 Controller Operation Ramp and Soak Program 9 6 9 6 1 9 6 2 SET Set the new units and resume temperature display Ramp and Soak Program The ramp and soak program feature allows the user to program a number of set points and have the instrument automatically cycle between the tempera tures holding at each for a length of time The user can select one of four dif ferent cycle functions The program parameter menu is accessed by pressing SET and then UP Press SET to enter the program menu SET Enter program menu Number of Program Set points The first parameter in the progr
68. not temperature but the controller otherwise appears to operate normally increase The problem may be either insufficient heating or no heating at all or too much cooling The heater power setting being too low especially at higher operating temperatures may cause insufficient heating Switching to the higher heater power switch setting if available may solve the problem Try reducing cooling capacity by increasing the cooling temperature switching the cooling power switch to LOW or switching off the cooling altogether One or more burned out heaters or blown heater fuses may also cause this problem If the heaters seem to be burned out contact a Hart Authorized Service Center see Section 1 3 for assistance The controller display flashes The display flashes c ut o u t alternately with the process tempera cutout andthe heater does ture If the process temperature displayed seems grossly in error con not operate sult the following problem The display flashes cutout and an incorrect process temperature Normally the cutout disconnects power to the heater when the bath temperature exceeds the cutout set point causing the temperature to drop back down to a safe value If the cutout mode is set to AUTO the heater switches back on when the temperature drops If the mode is set to RESET the heater only comes on again when the tempera ture is reduced and the cutout is manually reset by the operat
69. ns Section 9 10 for setting the cutout Both the manual 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 cutout and the temperature is decreasing A Note When checking the over temperature cutout be sure that the temperature limits of the bath fluid are not exceeded Exceeding the tem perature limits of the bath fluid could cause harm to the operator lab and instrument 13 Troubleshooting Troubleshooting 13 13 1 Troubleshooting This section contains information on troubleshooting CE Comments and a wiring diagram This information pertains to a number of bath models and cer tain specifics may not pertain to your model Troubleshooting In the event that the instrument appears to function abnormally this section may help to find and solve the problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please read this section carefully and attempt to understand and solve the problem If the probe seems faulty or the problem cannot otherwise be solved contact a Hart Authorized Service Center see Section 1 3 for assistance Be sure to have the model number and serial number of your instrument available Problem Causes and Solutions The heater indicator LED stays The display does not show cutout nor displays an incorrect bath red but the temperature does
70. oint at which decomposition of the fluid begins Further increasing the temperature may accelerate decomposi tion to the point of danger or impracticality 33 6331 Calibration Bath User s Guide 34 8 2 8 3 8 4 8 5 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 Power Power to the bath is provided by a grounded AC mains supply Refer to Section 3 1 Specifications for power details Power to the bath passes through a filter to prevent switching spikes from being transmitted to other equipment To turn on the bath switch the control panel power switch to the ON 1 posi tion The stirring motor turns on the LED display begins to show the bath tem perature and the heater turns on or off until the bath temperature reaches the programmed set point When powered on the control panel display briefly shows a four digit number This number indicates the number of times power has been applied to the bath Also briefly displayed is data which indicates the controller hardware configu ration 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 t
71. ontrolling at a speci fied set point At this set point the temperature does not agree with that measured by the user s reference thermometer to within the spec ified accuracy This problem may be caused by an actual difference in temperature between the points where the control probe and ther mometer probe measure temperature by erroneous bath calibration parameters or by a damaged control probe Check that the bath has an adequate amount of fluid in the tank and that the stirrer is operating properly Check that the thermometer probe and control probe are both fully inserted into the bath to minimize temperature gradient errors Check that the calibration parameters are all correct ac cording to the Report of Test If not re program the con stants The memory backup battery may be weak causing errors in data as described in the problem The display flashes cutout and an incorrect process tem perature Check that the control probe has not been struck bent or damaged If the cause of the problem remains un known contact a Hart Authorized Service Center see Section 1 3 for assistance 13 Troubleshooting Comments 13 2 13 2 1 13 2 1 1 13 2 1 2 13 2 2 Problem Causes and Solutions The controller shows that the out If the bath temperature does not achieve the expected degree of sta put power is steady but the pro bility when measured using a thermometer try adjusting the propor cess
72. operation of the bath These parameters should not be ad justed except in the event the controller s memory fails The user may then re store these values to the factory settings A list of these constants and their settings are supplied to the user in the Report of Test Caution DO NOT change the values of the bath calibration constants from the factory set values The correct setting of these parameters is im portant to the safety and proper operation of the bath The calibration parameters menu is indicated by CAL i Calibration parameters menu Press SET five times to enter the menu CTO Parameter CTO sets the calibration of the over temperature cutout This is not adjustable by software but is adjusted with an internal potentiometer For the 6331 bath this parameter should read 310 CO and CG These parameters calibrate the accuracy of the bath set point These are pro grammed at the factory when the bath is calibrated Do not alter the value of these parameters If the user desires to calibrate the bath for improved accuracy then calibrate RO and ALPHA according to the procedure given in Section 11 Calibration Procedure HandL These parameters set the upper and lower set point limits of the bath DO NOT change the values of these parameters from the factory set values To do so may present danger of the bath overheating and causing damage or fire 55 10 Digital Communication Interface Serial Communications
73. or see Section 9 10 Cutout Check that the cutout set point is adjusted to 10 or 20 C above the maximum bath operating temperature and that the cutout mode is set as desired If the cutout activates when the bath temperature is well below the cutout set point or the cutout does not reset when the bath tempera ture drops and it is manually reset then the cutout circuitry or the cut out thermocouple sensor may be faulty or disconnected Contact a Hart Authorized Service Center see Section 1 3 for assistance 71 6331 Calibration Bath User s Guide 72 Problem Causes and Solutions The display flashes cutout and an incorrect process temperature The problem may be that the controller s voltmeter circuit is not func tioning properly A problem could exist with the memory back up bat tery If the battery voltage is insufficient to maintain the memory data may become scrambled causing problems A nearby large static dis charge may also affect data in memory Holding the SET and EXIT keys down while power to the controller is switched on may reset the memory The display shows indicating the memory is being initialized At this point each of the controller parameters and calibration constants must be repro grammed into memory You can obtain the calibration constants from Report of Test If the problem reoccurs the battery should be replaced Contact an Authorized Service Center see Section
74. perature changes dirt etc The surface where the bath is placed must be level Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument Because the bath is designed for operation at high temperatures keep all flam mable and meltable materials away from the bath Although the bath is well in sulated top surfaces do become hot Beware of the danger of accidental fluid spills If used at high temperatures a fume hood should be used to remove any va pors given off by hot bath fluid Tipping Prevention Bracket Installation In order to create the safest possible conditions under use your bath comes equipped with a Tipping Prevention Bracket The installation of the bracket is required for compliance with the international safety standard IEC 1010 1 Sec tion 7 3 Stability which applies to the stability of the bath under normal oper ating conditions 17 6331 Calibration Bath User s Guide 5 3 1 5 3 2 5 3 3 Installation On A Wood Floor The wood floor installation kit includes lag bolts Drill three 1 8 inch x 1 inch deep approximately 3 mm x 25 5 mm pilot holes using the bracket to mark the hole placement Use the lag bolts to install the bracket to the floor Ensure that the bracket is installed in such a way as to ensure the bath will have a mini mum 6 inches of clearance for air circulation See Figure 2 Screw the bracket securely to the floor Wall Cast
75. r OFF scan ON Set scan function sc an on of f ON or OFF Turn scan function on sc an on Sc on Turn scan function off sc an of f sc of Read scan rate sr ate Sr srat 9 999 C or F min srat 0 010 C min Set scan rate to n degrees per sr ate n sr 5 0 001 to minute 5 000 C min 0 002 to 9 000 F min 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 Ramp and Soak Menu Read number of programmable pn pn 9 pn 2 set points Set number of programmable pn n pn 4 208 set points to n Read programmable set point psn ps3 psn 9999 99 C or F pst 50 00C number n Set programmable set point num psnzn ps3 50 1 to 8 Instru ber nto n ment Range 40 to 150 C Read program set point soak pt pt ti 999 5 Set program set point soak time pt 5 0 to 500 to n minutes Read program control mode pe prog OFF Set program control mode pc g o s top c ont GO or STOP or CONT Start program 0 0 pc g Stop program pc s top pc s Continue program 61 6331 Calibration Bath User s Guide Interface Command Summary continued Command Command Retur
76. rement 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 Serial sample period parameter Press SET to choose to set the sample period The current sample period value is displayed Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value SA 60 1 New sample period Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full du plex or half duplex With full duplex any commands received by the bath via the serial interface are immediately echoed or transmitted back to the device of origin and the command is executed With half duplex the commands are exe cuted but not echoed The duplex mode parameter is indicated by dUPL i Serial duplex mode parameter Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables on or disables off transmission of a linefeed character LF ASCII 10 after transmission of any carriage return The linefeed parameter is indicated by LF Serial linefeed parameter 53 6331 Calibration Bath User s Guide 54 9 15 9 15 1 9 15 2 Press SET to access the linefeed parameter LF On 1 Current linefeed setting IEEE 488 Parameters Baths may optionally be fitted with an IEEE 488 GPIB interface In this
77. 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 The display indicates the reset function 37 6331 Calibration Bath User s Guide sa uP y Display EXIT Program Menu Temperature SET SET Number of Set points es ee 1 l lt EXI Reset Cutout Y no SET Adjust Set point M sg H Select Set point E MR ial Y EXIT lt EXIT Select Setpoint s SECONDARY FUNCTIONS BI Adjust Setpoint L sm Bir SET I SET Y Program Function Mode Y HH Display Power Adjust Vernier EXIT SET i Y lt sT Program Control Set Proportional Band Scan on off lt EXIT SH SET Y Y 1 Scan Rate 4 EXIT Set Cut out Temp SET SET Y Y Set Scale C F Leg EXIT Configuration Menu 1 SET Si A A A A EXIT EXIT EXIT EXIT EXIT
78. riod is the next parameter in the menu and prompted with SAnPLE The sample period is the time period in seconds between tempera ture measurements transmitted from the serial interface If the sample rate is set to 5 the bath transmits the current measurement over the serial interface ap proximately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Adjust the period with UP or DOWN and then use SET to set the sample rate to the displayed value Duplex Mode The next parameter is the duplex mode indicated with dUPL The duplex mode may be set to half duplex HA LF or full duplex FULL With full duplex any commands received by the bath via the serial interface are immedi ately echoed or transmitted back to the device of origin and the command is ex ecuted 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 0 n or disables 0 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 using UP or DOWN and pressing SET Serial Operation Once the cable has been at
79. s are 79 843 and 119 914 C respectively Refer to Figure 8 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 8439 ty 120 00 C measured t 119 914 C Compute errors 79 843 80 00 C 0 157 erry 119 914 120 00 C 0 086 C Compute RO RO E 0 086 x 800 Sq 0157X1200 oases 1 100000 100115 120 0 80 0 Compute ALPHA ALPHA 0 00385 x 120 0 0 157 1 0 00385 x 80 0 0 086 0 00385 0 0038387 120 0 80 0 Figure 8 Calibration Example 67 12 Maintenance 12 Maintenance e The calibration instrument has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments e Ifthe outside of the bath becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint e When using silicon oil the bath will require periodic maintenance The silicon oil will condense on the bath during normal operation due to the outgasing of the oil How often and how long the bath is operated at higher temperatures deter
80. s value 45 6331 Calibration Bath User s Guide 46 9 9 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 determine the stability of the bath temperature With good control stability the percent 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 displays as a percentage of full power Access heater power in secondary menu i Heater power in percent To exit out of the secondary menu press EXIT To continue on to the propor tional band setting function press SET Return to temperature display Proportional Band In a proportional controller such as this the heater output power is proportional to the bath temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bot 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 wa
81. sing an algicide chemical in the water to prevent contamination Ethylene Glycol The temperature range of water may be extended by using a solution of 1 part water and 1 part ethylene glycol antifreeze The characteristics of the ethylene glycol water solution are similar to water but with higher viscosity Use caution with ethylene glycol since this fluid is very toxic Ethylene glycol must be dis posed of properly Mineral Oil Mineral oil or paraffin oil is often used at moderate temperatures above the range of water Mineral oil is relatively inexpensive At lower temperatures mineral oil is quite viscous and control may be poor At higher temperatures vapor emission becomes significant The vapors may be dangerous and use of a fume hood is highly recommended As with most oils mineral oil expands as temperature increases See Section 7 3 1 Fluid Expansion Reservoir for infor mation on the fluid expansion reservoir use Since the viscosity and thermal characteristics of mineral oil is poorer than water temperature stability is not as good Mineral oil has very low electrical conductivity Use caution with mineral oil since it is flammable and may also cause serious injury if inhaled or ingested Silicone Oil Silicone oils are available which offer a much wider operating temperature range than mineral oil Like most oils silicone oils have temperature control 8 General Operation Heat Transfer Fluid 8 1 11 8 1 11 1 8
82. st cover and set aside Then undo the thumbscrew and carefully lift it with the two handles provided on the back The fluid may then be poured back into the bath when it is cooler or poured into some other approved container Caution Be careful when han dling hot fluids burns can result When the excess fluid has been removed re verse the process to replace the reservoir and dust cover Always wipe away spilt fluid if spilling occurs WARNING The overflow tube is not large enough to handle large flow rates encountered by overfilling the tank It is intended for expanding fluid rates from heating only Fill only until the level reaches the top of the baf fle see Figure I on page 13 25 8 General Operation Heat Transfer Fluid 8 1 8 1 2 General Operation Heat Transfer Fluid Many fluids work with the 6331 bath Choosing a fluid requires consideration of many important characteristics of the fluid Among these are temperature range viscosity specific heat thermal resistivity thermal expansion electrical resistivity fluid lifetime safety and cost Temperature Range One of the most important characteristics to consider is the temperature range of the fluid Few fluids work well throughout the entire temperature range of the bath The temperature at which the bath is operated must always be within the safe and useful temperature range of the fluid used The lower temperature range of the fluid is determined either by
83. t information exercising proper judgement and insuring safe operation Operating near the limits of certain properties such as the flash point or viscosity can compromise safety or performance Your company s safety policies regarding flash points toxicity and such issues must be considered You are responsible for reading the MSDS material safety data sheets and act ing accordingly About the Chart The fluid chart visually illustrates some of the important qualities of the fluids shown Temperature Range The temperature scale is shown in degrees Celsius The fluids general range of application is indicated by the shaded bands Qualities including pour point freeze point important viscosity points flash point boil ing point and others may be shown Freezing Point The freezing point of a fluid is an obvious limitation to stir ring As the freezing point is approached high viscosity may also limit performance Pour Point This represents a handling limit for the fluid Viscosity Points shown are at 50 and 10 centistokes viscosity When viscosity is greater than 50 centistokes stirring is very poor and the fluid is unsatisfactory 31 6331 Calibration Bath User s Guide Table2 Table of Bath Fluids Fluid Lower Upper Thermal Thermal Hart Part No Temperature Temperature Flash Viscosity Specific Specific Heat Conductivity Expansion Resistivity Limit Lim
84. tached and the interface set up properly the control ler immediately begins transmitting temperature readings at the programmed rate The serial interface operates with 8 data bits 1 stop bit and no parity The set point and other commands may be sent to the bath via the serial interface to 10 Digital Communication Interface IEEE 488 Communication optional 10 2 10 2 1 10 2 1 1 10 2 1 2 10 2 2 10 3 set the bath and view or program the various parameters The interface com mands are discussed in Section 10 3 Interface Commands All commands are ASCII character 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 connect an IEEE 488 standard cable to the back of the bath set the device address and set the transmission termination character To enter the IEEE 488 parameter programming menu press EXIT and SET simultaneously and then release to enter the secondary menu Press SET re peatedly until the display reaches 0b E Press UP repeatedly until the IEEE 488 interface menu is indicated with IEEE Press SET to enter the IEEE 48
85. the fluid expansion reservoir 24 7 Parts and Controls Back Panel 7 3 1 Fluid Expansion Reservoir The fluid expansion reservoir is attached to the rear panel of the bath Its pur pose is to receive excess fluid expanded in the process of heating the bath to higher temperatures Any liquid will expand when heated To prevent the bath from overflowing the excess fluid must be removed prior to heating or there must be a means of allowing it to drain out of the bath tank Note the fluid level must never be below the heating elements This bath has an overflow tube attached to the bath tank that extends to the rear of the bath and drains into the fluid expansion reservoir The reservoir has enough capacity to cover a large range of thermal expansion rates for different fluids No attempt must be made to plug the overflow tube to prevent fluid from draining Do not attempt to fill the bath to a level higher than the overflow tube level The fluid expansion reservoir is stainless steel with an aluminum heat shield to prevent touching when the tank is hot There is a stainless steel dust cover over the reservoir with an elbow on top that the drain tube is inserted into The reser voir hangs on a hook and is attached to the bath with a thumbscrew WARNING The drain tube and dust cover may be hot Always be sure the drain tube is fully inserted into the elbow of the dust cover To drain fluid from the reservoir first remove the du
86. the freeze point of the fluid or the temperature at which the viscosity becomes too great The upper temperature is usually limited by vaporization flammability or chemical breakdown of the fluid Vaporization of the fluid at higher temperatures may adversely affect temperature stability because of cool condensed fluid dripping into the bath from the lid The bath temperature should be limited by setting the safety cutout so that the bath temperature cannot exceed the safe operating temperature limit of the fluid See Section 9 10 Cutout Viscosity Viscosity is a measure of the thickness of a fluid or how easily it can be poured and mixed Viscosity affects the temperature uniformity and stability of the bath With lower viscosity fluid mixing is better therefore creating a more uni form temperature throughout the bath This improves the bath response time which allows it to maintain a more constant temperature For good control the viscosity should be less than 10 centistokes 50 centistokes is about the practi cal upper limit of allowable viscosity Viscosity greater than this causes very poor control stability because of poor stirring and may also overheat or damage the stirring motor Viscosity may vary greatly with temperature especially with oils When using fluids with higher viscosities the controller proportional band may need to be increased to compensate for the reduced response time Otherwise the temperature may begin to oscil
87. ualified electrician DO NOT use an extension cord or adapter plug e DO use a ground fault interrupt device This unit contains a fluid A ground fault device is advised in case fluid is present in the electrical sys tem and could cause an electrical shock e Always replace the power cord with an approved cord of the correct rat ing and type If you have questions contact a Hart Scientific Authorized Service Center see Section 1 3 6331 Calibration Bath User s Guide 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 BATH FLUIDS Fluids 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 Utilization of a vent hood or other ventilation system is required for sili con oil at high temperatures The unit is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check the flash point boiling point or other fluid characteristic applicable to the circumstances of the unit operation Ensure that the soft cutout is adjusted to the fluid characteristics of the ap plication 1 2 2 A Cautions Always operate this instrument at room temperature between 41 F and 10
88. y the temperature is maintained at a fairly constant temperature 9 Controller Operation Proportional Band The temperature stability of the bath depends on the width of the proportional band see Figure 6 aan Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band Figure 6 Bath Temperature Fluctuation At Various Proportional Band Settings If the band is too wide the bath temperature deviates excessively 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 proportional band is too narrow the bath temperature may swing back and forth because the controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width The optimum proportional band width depends on several factors in cluding fluid volume fluid characteristics viscosity specific heat thermal con ductivity operating temperature and stirring Thus the proportional band width may require adjustment for best bath stability when any of these condi tions change Of these the most significant factors affecting the optimum pro portional band width are the fluid viscosity and thermal noise due to difference in temperature between the fluid and ambient The proportional b

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