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Access set-point memory

1. 4 3 p 2 1 REVISIONS vic oR DESORPTION anova INITIAL RELEASE DD MH RH 07 17 00 JY PEW NE omo OPTIONAL GANONG D D 1 INTERFACE 7 8 m AO 2 M3 WHT YEL BLK 18 o Vu ERAN sada ZI sob MATOLED 00003100 W7 W4I ORG BLK 18 NOTES 4 Mor 8 ALL WRES SHALL BE INSULATED WITH PVC 5109 INSULATION AS 5 ms 14 AC wig wat ORG 16 DISPLAY MINIMUM UNLESS OTHERWISE INDICATED HEATER WIRES W25 W26 SHALL BE INSULATED WTH GLASS FIBER OR EQUIVALENT a AY io NL Im WESS VOLTAGE AT E GF 300 VOC MINIMUM 11 WRE GAUGE SIZES AS INDICATED MAY BE SUBSTITUTED WTH pev ruses si me a PROBE 16 LARGER GAUGE SIZES wis GRY 14 TER g 12245 7 12 SEE DRAWING CO01 3035 FOR WIRING HARNESS SPECIFICATIONS CUNG TS Lis 0238 a d 7s vie ann Gaal Es TORTE PLAY HEATER FUSE DIGITAL BOARD CONNECTION ws RELAY 2 wirya 14 SUBASSY 11
2. 53 53 10 3 Interface 5 54 11 57 11 1 Calibration Points 57 11 2 Measuring the Set point 57 11 3 Computing RO and 57 114 Calibration 58 12 6 Troubleshooting EUR wae 09 13 1 Troublesligoflng 2 22255222 1 CE OX TE DUE 63 132 Commenls eb RE s 65 srasah X E ce en ESA 65 13 22 Low Voltage Directive Safety 66 13 3 Wiring Diagram s ss cu ES 67 Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Baffle Showing Minimum and Maximum Fill 18 Front Panel 23 Chart Showing Usable Range Of Various 05 31 Controller Operation Flowchart 36 Bath Temperature Fluctuation At Various Proportional Band Settings
3. 45 Serial Interface Parameters 45 AMETE P 46 9122 Sample Perioder Rer ok cime rete Oe Cade 46 91222 D plex Mode hob d eet ange Eus 4 1274 a aea 47 913 488 Parameters M MM 47 ara ken 48 9 13 2 Transmission 48 9 14 Calibration 5 48 DUMP 49 9142 COON CG ace et hk 4k Ree P EE D eS RUE Ra oec 49 Ka a eset M cce dme EA eric T 49 10 Digital Communication Interface 5l 10 1 Serial 5 5 Winnie 5 1042 Setup i us sees Rises va ae te we ore M esed 5 1012 1 Baud Rata ek ghe hne gae 52 101 22 Sample Period rer Ry RR 52 101 23 Duplex core RR RR 52 1012 4 hee TE aS PRO Shee ames 52 10 1 3 Serial 52 10 2 IEEE 488 Communication 53 VINE rcr 53 o sasore aaea an aa e a Ba 53 10 2 1 2 Transmission
4. 29 8 1 11 Fluid Characteristics 29 8 1 11 1 Limitations and Disclaimer liliis 29 81 112 About the or e RE Ru Re RH 30 SHIPPING sain acne he RR ad erae EROR ORG RH AR aE ON nana 32 a a Aa 32 Anl 32 Temperature Controller onnu annaua 33 9 Controller 355 9 1 9 2 9 3 9 4 9 5 9 6 9 7 98 99 910 9 11 9 12 Bath Temperature 35 Reset Cutout heck alae hae eh bow de ide eT MATS a pp 35 Temperature 37 93 1 Programmable Set points 37 93 2 Set pollit VOIUE iusso msc obe PC IE Ce en UR aer dpt ctos 38 933 Setpoint Vernier 5 got weaned e tee XE e a E PX ERR dues 38 Temperature Scale 5 39 Secondary 40 Heater Power 22520220202 RR MC 40 Proportional 4 RE RENE axe ADA Sih SUN OS 43 Controller 44 PrbeParameters M rr 45 9102 ALPHA 5225 cm 45 Operating Parameters abe 45 9 11 1 Cutout Reset
5. y PAN EEA Display Power EXIT Reset Cutout X Y 1 Cutout Active SET eR ERIT Y M EXIT amp Set Proportional Band Select Setpoint Y SET Y Y EXIT Set Cutout Temp EXIT Adjust Setpoint Y SET X Y Y EXIT amp Configuration Menu MC EXIT Adjust Vernier Y SET SET Y EXIT Set Scale C F Y SET EXIT EXIT EXIT i EXIT UP UP UP UP me DOWN DOWN DOWNL DOWN calibration lt Menu c SET SET X5 Cutout BAUD Device Rate Address SET EXIT SET EXIT E SET EXIT sm Gc Period 1 o SET EXIT SET EXIT SEUEXIT 125 SET EXIT f o Duplex lt Te i gt SET EXIT i 5 SET EXIT DI Linefeed IEEE 488
6. 41 Serial Communications Cable Wiring 5 Calibration 59 Wiring Did grain ey a 67 Tables Table 1 Table 2 Table 3 Table 4 Table 4 International Electrical 5 Tableof Bath 0 5 30 Proportional Band Fluid 42 Interface Command 55 Interface Command Summary 56 6330 1 Before You Start Before You Start Symbols Used Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description AC Alternating Current AS Battery O gt gt i eo Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On 1 Before You Start Symbol Description e Canadian Standards Association OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 refers to BAI 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 hous
7. 9 13 2 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 488 termination Use to save the new selection 9 14 Calibration Parameters The operator of the bath controller has access to a number of the bath calibra tion constants namely and L These values set at the fac tory and must not be altered The correct values are important to the accuracy 48 Hart Scientific 9 Controller Operation and proper and safe 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 9 14 1 CTO Parameter CTO sets the calibration of the over temperatu
8. H Option Installed O SET EXIT aa ac SET EXIT lt E L t o 2 senex o a Figure 4 Controller Operation Flowchart 36 Hart Scientific 6330 9 3 9 3 1 9 Controller Operation rESEE P Cutout reset function Press once more to reset the cutout SET Reset cutout This action also switches the display to the set temperature function To return to displaying the temperature press the EXIT button If the cutout is still in the over temperature fault condition the display continues to flash 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 liquid 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
9. HART SCIENTIFIC Fluke Company 6330 Calibration Bath User s Guide Rev 261402 Copyright 2000 2002 All Rights Reserved Hort Scientific Inc 799 E Utah Valley Drive American Fork Utah 84003 9775 Telephone 801 763 1600 Fax 801 763 1010 Internet http www hartscientific com Rev 261402 4 Table of Contents Before You AW ak aw RA Re 1 1 1 SymbodsUsed lesse RR RR 1 12 5 2 TAI Warnings ers 2 4 1 3 Hart Scientific Authorized Service Centers nnana 5 Introd cilali zu v ux b RACES RS Ge Rx S 7 Specifications and Environmental Conditions 9 3 1 Specitications eee RR X VETE 9 3 2 Environmental Conditions eee 10 33 10 QUIK Start 5 cuo R ROCA SREP 5 13 41 13 DES D aaa Na aa ang and ang ag ee tee ee m 13 43 EAR e ERR MTS 13 44 Setting the Temperature coe 14 Installation 17 5 BathEmironmnt 17 52 Dry out 17 53 Bath Preparation and 17 SA gt anas ang
10. The digital LED display on the front panel allows direct viewing of the actual bath temperature This temperature value is what is normally shown on the dis play The units C or F of the temperature value are displayed at the right For example Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Reset Cutout If the over temperature cutout has been triggered the temperature display alter nately flashes cutouk 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 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 9 Controller Operation Display Temperature gt SET EXIT
11. baud rate is the first parameter in the menu baud rate setting deter mines the serial communications transmission rate baud rate parameter is indicated by Serial baud rate parameter Press 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 e400 b New baud rate Press SET to set the baud rate to the new value or EXIT to abort the opera tion and skip to the next parameter in the menu 9 12 2 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 measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by SAAPLE Serial sample period parameter Press SET to choose to set the sample period The current sample period value is displayed SA i Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value 46 Hart Scientific 6330 9 12 3 9 12 4 9 13 9 Con
12. Bath Use 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 and could overflow the bath if not watched Refer to General Op eration Section 8 for information specific to fluid selection and to the MSDS sheet specific to the fluid selected Generally baths are set to one temperature and used to calibrate probes only at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left en ergized reducing the stress on the system The bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot 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 towel before inserting it into another bath This prevents the mixing of fluids from one bath to anoth
13. 150 C 0 482 200 C Dow Corning 200 20 7 v 230 C fl 23092 20 25 C 0 949 c0 25 0 370 40 0 00034 25 0 00107 1000 25 C 5013 0 393 100 C 50 150 C 0 420 200 C Dow Corning 200 50 25 v 280 C fl cc 280 C 50 25 C 0 96 25 C 0 4 0 00037 25 C 0 00104 1000 25 C Silicone Oil 50 150 C Dow Corning 550 70 C v 232 C fl 232 C 50 70 C 1 07 25 C 0 358 40 0 00035 c 25 0 00075 100 25 C 5016 300 C fl oc 10 104 0 386 100 C 1 150 C 0 433 200 C Dow Corning 710 80 C v 302 C fl oc 302 C 50 80 C 1 11 25 C 0 363 40 0 00035 25 0 00077 100 25 C 5017 7 204 C 0 454 100 C 1 150 C 0 505 200 C Dow Corning 210 H 66 v 315 C fl oc 315 C 50 66 C 0 96 25 C 0 34 100 C 0 0003 0 00095 100 25 C Silicone Oil 14 204 C 1 150 C Heat Transfer Salt 145 fr 530 C NONE 34 150 C 2 0 150 C 0 33 0 0014 0 00041 17 Q ai 5001 6 5 300 C 1 9 300 C 24 500 C 1 7 500 C Limiting Factors b boiling point 84 11 2 About the Graph e high evaporation fl flash point fr freeze point viscosity Flash point test open cup closed cup Very low water solubility ice will form as a slush from condensation below freezing The fluid graph visually illustrates some of the important qualities of the fluids shown Temperature Range The temperature scale is show
14. The duplex mode may be set to half duplex HA LF or full duplex FULL With full duplex any commands received by the bath via the serial interface are immedi ately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The default setting is full duplex The mode may be changed using UP or DOWN and pressing SET Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables 0 or disables G F F transmission of a linefeed charac ter LF ASCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed using UP or DOWN and pressing SET Serial Operation Once the cable has been attached and the interface set up properly the control ler immediately begins transmitting temperature readings at the programmed rate The serial interface operates with 8 data bits 1 stop bit and no parity The Hart Scientific 6330 10 2 10 2 1 10 2 1 1 10 2 1 2 10 2 2 10 Digital Communication Interface set point and other commands may be sent to the bath via the serial interface to set the bath and view or program the various parameters The interface com mands are discussed in Section 10 3 Interface Commands All commands ASCII character strings terminated with a carriage return character CR ASCII 13 IEEE 4
15. temperature limits of the bath fluid could cause harm to the operator lab and instrument Hart Scientific 6330 13 13 1 13 Troubleshooting 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 red display does not show cutout nor displays an incorrect bath temper but the temperature does not ature but the controller otherwise appears to operate normally The increase 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
16. the serial interface menu is indicated with 5E r 1AL Finally press SET to enter the serial interface parameters menu In the serial interface parameters menu are the BAUD rate sample rate duplex mode and linefeed parameters Baud Rate baud rate is the first parameter in the menu The display prompts with the baud rate parameter by showing B A U g Press SET to choose to set the baud rate The current baud rate value is displayed The baud rate of the serial com munications 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 period is the next parameter in the menu and prompted with SA nPLE 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 sam ple 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
17. 6330 9 10 1 9 10 2 9 11 9 11 1 9 12 9 Controller Operation 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 Normally this is set for 100 000 ohms 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 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 Cutout reset mode parameter Press SET to access the parameter setting Normally the cutout is set for au tomatic mode Cutout set for automatic reset Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by i Serial RS 232 interface parameters menu 9 Controller Operation 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 9 12 1 Baud Rate
18. Access Hole Cover e Manual If you are missing any item please call a Hart Authorized Service Center see Section 1 3 Set Up 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 bath in a safe clean and level location Fill the bath tank with an appropriate liquid For operation at moderate bath temperatures clean distilled water works well Carefully pour the fluid into the bath tank through the large rectangular access hole above the tank avoiding spilling any fluid The fluid must not exceed a height of 12 7 20 3 mm 0 5 0 8 inches below the bottom of the lid NOT the access cover 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 4 Quick Start 44 The bath begins to heat or cool to reach the previously programmed tempera ture set point The 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 o
19. aana EEG ES NA dM 19 auci ice cmd RC Rae ER 21 2 6 2 Comparison Calibration 21 6 3 Calibration of Multiple 5 22 Parts and Controls ec wwe Se OS We wa KOS 23 23 72 24 24 8 General 25 8 1 8 2 8 3 8 4 8 5 Heat Transfer 0 25 6 1 Temperature ER EX Ye AR es 25 MERRILL a Gg AGA ana aba a a aaa 25 812 Specific Heat MER oa E NB gia Ge Rr e bab ir SUR P EROR o Re Tes 26 814 Thermal 26 815 Thermdbpansion 26 8 1 6 Electrical 27 917 Fluid Lifetime oce ei mr es 27 BABY e be dar dense pes 27 8119 uU eA RR RUE UP 28 8 1 10 Commonly Used 5 28 28 8 102 EthyleneGlycol 28 8 1103 Mineral il sco ic eio oae e RR re eedem 28 8 1 10 4 Silicafie Dill de ee Reed Rr
20. controls power to the entire bath including the stir ring motor 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 1 green the heater 1s off and the bath is cooling 7 Parts and Controls 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 control ler allowing the controller to maintain a constant temperature The control probe is a precision platinum resistance thermometer PRT It is delicate and must be handled carefully The probe is placed in the small hole in the top of the bath inside the motor cover so that the probe tip is fully im mersed 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
21. cools control is unstable If both the bath temperature and output power do not vary periodically but in a very erratic manner the problem may be excess noise in the sys tem Noise due to the control sensor should be less than 0 001 C How ever if the probe has been damaged or has developed an intermittent 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 a Hart Authorized Service Center see Section 1 3 for assistance Comments EMC Directive Hart Scientifics equipment has been tested to meet the European Electromag netic Compatibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested 13 Troubleshooting 13 2 2 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 66 Hart Scientific 13 Troubleshooting 13 3 Wiring Diagram
22. directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordi nances Consult a qualified electrician DO NOT use an extension cord or adapter plug DO use a ground fault interrupt device This unit contains a liquid A ground fault device is advised in case liquid is present in the electrical system and could cause an electrical shock Always replace the power cord with an approved cord of the correct rating and type If you have questions contact a Hart Scientific Authorized Ser vice Center see Section 1 3 High voltage is used in the operation of this equipment Severe injury or death may result if personnel fail to observe the safety precautions Before 1 Before You Start 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 The unit 15 equipped with a soft cutout user settable firmware and 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 temperatu
23. equipment the user is re sponsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material MSDS sheets ap plicable to all fluids used in the baths should be kept in close proximity to the instrument If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the bath If there are any ques tions call a Hart Authorized Service Center see Section 1 3 for more in formation 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 12 Maintenance e Ifthe instrument is used in a manner not in accordance with the equip ment design the operation of the bath may be impaired or safety hazards may arise The over temperature cutout should be checked every 6 months to see that it is working properly In order to check the user selected cutout follow the controller directions Section 9 8 for setting the cutout Both the man ual and the auto reset option of the cutout should be checked Set the bath temperature higher than the cutout Check to see if the display flashes cut out and the temperature is decreasing Note When checking the over temperature cutout be sure that the tem perature limits of the bath fluid are not exceeded Exceeding the
24. liquid Be sure that all probes are in serted deep enough to prevent stem effect From research at Hart Scientific 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 sub merge the probe handles If the probe handles get too warm during calibration at high temperatures a heat shield could be used just below the probe handle This heat shield could be as simple as aluminum foil slid over the probe before inserting it in the bath or as complicated as a specially designed reflective metal apparatus When calibrating over a wide temperature range better results can generally be achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The ob ject is to keep the reference probe and the probe s to be calibrated as closely grouped as possible in the working area of the bath Bath stability is maximized when the bath working area is kept covered In preparing to use the bath for calibration start by e Placing the reference probe in the bath working area e Placing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe Calibration of Multiple Probes Fully loading the bath with probes increases the
25. 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 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 1 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 oscillate 8 General Operation 8 1 3 Specific Heat Specific heat is the measure of the heat storage ability of the fluid S
26. 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 PARTICU Hart Scientific 3 Specifications and Environmental Conditions LAR PURPOSE OR USE HART SHALL NOT BE LIABLE FOR ANY SPE CIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS WHETHER IN CONTRACT TORT OR OTHERWISE 6330 n 6330 4 1 4 2 4 3 4 Quick Start 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 occurred during shipment If there is shipping damage notify the carrier immediately Verify that all components are present e 6330 Bath
27. 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 7 3 Back Panel On the back of the bath there are two systems fuses and the removable power cord Hart Scientific 6330 8 1 1 8 1 2 8 General Operation General Operation Heat Transfer Fluid Many fluids work with the 6330 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 the freeze point of the fluid or the temperature at which the viscosity becomes too great The upper
28. 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 calibrated 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 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 If the bath is set f
29. 5 VAT WANG 230 VAC E uh FAN A SYSTEM A see e EE A HEATERS 10A HEATERS EN ne u Me PIOD ANTO HEATERS a B B TU N Mr aa RR __ 3 gt PROBE 2 CTRL sensor 6 CUT OUT SENSOR GND CONNECT TO 181 1 A ERN en wawu na a A A f A T A DRAWN BY 788 East tah Valey De A AG A TANGEN cm e E ER Bh 8 EN ER tie 2 9 GUZMAN 07 17 00 WIRING DIAGRAM 6330 4 POWER ENTRY MODULE 940252 RECEPTACLE 87 71 00 INE FILTER CONNECTOR TRAC CONNECTOR P101 CONNECTOR GoupuANGE NGS C 64841 6001 2887 MOLEX RECEPTACLE CONNECTOR P100 FRONT 10 CONNECTOR FRONT HEATON 07 17 00 NONE 1 4 3 2 1 Figure 8 Wiring Diagram 6330
30. 88 Communication optional 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 Pr Ob E Press UP repeatedly until the IEEE 488 interface menu is indicated with iE E E Press SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 ad dress parameter Address IEEE 488 address is prompted with Addr ESS 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 press ing or DOWN and then SET Transmission Termination 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 Comm
31. T 1 Or Dg Dg K T T 1 where Dg lt The Maximum Fill Depth Where K Expansion coefficient T Ending temperature T 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 gas ket 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 26 Hart Scientific 6330 8 1 6 8 1 7 8 1 8 8 General Operation Example final depth of Dow Corning 710 silicone oil in the bath tank is to be 9 2 inches when heated from 25 to 300 What should the starting depth be Expansion coefficient for 710 oil on Table 2 K 0 00077 inch inch C Ending temperature 300 C Starting temperature 25 C Ending depth D 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 electrical resistivity Fluid Lifetime Many fluids degrade over time because of vaporization water absorption gel ling or chemical breakdown Often the degradation becomes significant near the upper tem
32. The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed from the set point by pressing SET The vernier setting is displayed as a 6 digit num ber with five digits after the decimal point This is a temperature offset in de grees of the selected units C or F 0 00000 Current vernier value in C To adjust the vernier press UP or DOWN Unlike most functions the ver nier setting has immediate effect as the vernier is adjusted SET need not be 38 Hart Scientific 6330 9 4 9 Controller Operation pressed This allows one to continually adjust the bath temperature with the vernier as it is displayed Increment display 0 00090 i New vernier setting Next press EXIT to return to the temperature display or SET to access the temperature scale units selection Access scale units Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius or Fahrenheit 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 tim
33. The optimum proportional band width depends on several factors including fluid volume fluid characteristics viscosity specific heat thermal conductivity 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 band should be wider when the fluid viscosity 1s higher because of the increased response time and also when noise is greater Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band e nana a Figure 5 Bath Temperature Fluctuation At Various Proportional Band Settings 6330 4 9 Controller Operation The proportional band width is easily adjusted from the bath front panel The width may be set to discrete values in degrees C or F depending on the selected units The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the control ler percent output power display Narrow the proportional band width to the point at which the bath temperature begins to oscillate and then increase the band width from this point to 3 or 4 times wider Table 3 lists typical propor tional band settings f
34. 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 5 Installation 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 Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing Remove excess hot fluid if necessary with caution DO NOT turn on the bath without fluid in the tank Maximum and minimum fill levels are indi cated on the slotted baffle inside the tank MAX FILL MINFILL Figure 1 Baffle Showing Minimum and Maximum Fill Levels 18 Hart Scientific 6330 5 4 5 Installation Power With the bath power switch off plug the bath into a grounded AC mains outlet of the appropriate voltage frequency and current capacity Refer to Section 3 1 Specifications for details 6330 6 1 6 2 6 Bath Use
35. a ble temperature 8 5 Temperature Controller The bath temperature is controlled by Hart Scientific s unique hybrid digital an alog temperature controller The controller offers the tight control stability of an analog temperature controller as well as the flexibility and programmability of a digital controller The bath temperature is monitored with a platinum resistance sensor in the con trol probe The signal is electronically compared with the programmable refer ence signal amplified and then 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 with a separate thermocouple temperature monitoring circuit which shuts off the heater 1f the temperature exceeds the cutout set point The controller allows the operator to set the bath temperature with high resolu tion set the cutout adjust the proportional band monitor the heater output power and program the controller configuration and calibration parameters The controller may be operated in temperature units of degrees Celsius or Fahr enheit The
36. and non toxic Silicone oils are fairly expensive Fluid Characteristics Charts Table 2 and Figure 3 on pages 30 and 31 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 physi cal 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 liable for any personal injury or damage to equipment product or facilities resulting from the use of these fluids The user of the bath is responsible for collecting correct information exercising proper judgement and insuring safe operation Operating near the limits of certain properties such as the flash point or viscos ity can compromise safety or performance Your company s safety policies re g
37. ands 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 10 Digital Communication Interface 10 3 Interface Commands The various commands for accessing the bath controller functions via the digi tal interfaces are listed in this section see Table 4 These commands are used with both the RS 232 serial interface and the IEEE 488 GPIB interface In ei ther case the commands are terminated with a carriage return character The in terface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters which determines a unique command A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example 5 lt gt returns the current set point and 5 50 00 lt gt sets the set point set point 1 to 50 00 degrees In the following list of commands characters or data within brackets and J 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 Spac
38. arding flash points toxicity and such issues must be considered You are responsible for reading the MSDS material safety data sheets and acting accordingly 8 General Operation Table 2 Table of Bath Fluids Fluid Lower Upper Thermal Thermal Hart Part Temperature Temperature Flash Viscosity Specific Specific Heat Conductivity Expansion Resistivity No Limit Limit Point centistokes Gravity cal g C cal s em C 107 Halocarbon 0 8 90 C v 70 C e NONE 5 50 C 1 71 40 C 0 2 0 0004 0 0011 5019 0 8 40 C 0 5 70 C Methanol 96 C fr 60 C b 54 1 3 35 C 0 810 0 C 0 6 0 0005 co 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 Ethylene 35 C fr 110 C b NONE 7 0 1 05 0 8 0 C 0 001 Glycol 50 2 50 C 5020 0 7 100 C Mineral Oil 40 C v 190 C fl 190 C 15 9 75 C 0 87 25 C 0 48 25 C 0 00025 25 C 0 0007 50 C 5 25 5 125 C 0 84 75 C 0 53 75 C 0 81 125 C 0 57 125 C Dow Corning 200 5 40 C v 133 fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 25 C 0 00105 1000 25 C Silicone Oil 10 150 C Dow Corning 200 10 35 165 C fl cc 165 C 10 25 C 0 934 25 C 0 43 0 40 C 0 00032 25 C 0 00108 1000 25 C 5012 3 135 C 0 45 100 C 50
39. art vided to move the unit Due to the weight of the compressor it may re quire two people to safely move the bath If two people are used place one person in the front and one person in the back of the unit carefully slide hands under the unit and lift in unison Do not move a unit filled with fluid e Most probes have handle 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 1 3 Hart Scientific Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Hart Scientific Inc 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie 7340 5 1 Before You Start Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke S
40. col 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 va Hart Scientific 6330 8 1 10 4 8 1 11 8 General Operation por emission becomes significant The vapors may be dangerous and use ofa fume hood is highly recommended As with most oils mineral oil expands as temperature increases Be careful not to fill the bath so full that it overflows when heated 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 15 flammable and may also cause serious injury if inhaled or ingested Silicone Oil Silicone oils are available which offer a much wider operating temperature range than mineral oil Like most oils silicone oils have temperature control characteristics which are somewhat poorer than water The viscosity changes significantly with temperature and thermal expansion also occurs These oils have very high electrical resistivity Silicone oils are fairly safe
41. 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 6330 33 6330 9 1 9 2 9 Controller Operation Controller Operation This section discusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key switches and LED dis play the user may monitor the bath temperature set the temperature set point in degrees C or F monitor the heater output power adjust the controller propor tional band set the 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 4 on page 36 Bath Temperature
42. d 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 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 C to a few degrees below 100 C At higher temperatures evaporation becomes significant Water used in the bath should be distilled or deionized to prevent mineral deposits Consider using an algicide chemical in the water to prevent contamination Ethylene Glycol The temperature range of water may be extended by using a solution of 1 part water and 1 part ethylene gly
43. e errors again If desired the calibration procedure may be re peated again to further improve the accuracy 11 4 Calibration Example The bath is to be used between 75 and 125 C and it is desired to calibrate the bath as accurately as possible for operation within this range The current val ues for RO and ALPHA are 100 000 and 0 0038500 respectively The calibra tion points are chosen to be 80 00 and 120 00 C The measured bath temperatures are 79 843 and 119 914 C respectively Refer to Figure 7 for ap plying equations to the example data and computing the new probe constants 58 Hart Scientific 11 Calibration Procedure RO 100 000 ALPHA 0 0038500 t 80 00 measured t 79 843 120 00 measured t 119 914 C Compute errors err 79 843 80 00 0 157 119 914 120 00 0 086 C Compute 0 Rit 0 086 x 80 0 0157 x120 0 0 00385 1 100115 120 0 80 0 Compute ALPHA aeng 000888 x120 0 ee 0 086 Figure 7 Calibration Example 6330 59 6330 12 Maintenance Maintenance The calibration instrument has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments I
44. e instrument needs to be energized for a dry out period of 2 hours before it can be assumed to meet all of the safety re quirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to apply ing power such as storage in a low humidity temperature chamber operat ing at 50 degree centigrade for 4 hours or more DO NOT operate high temperature baths 500 C near flammable materi als Extreme temperatures could ignite the flammable material Overhead clearance is required Do not place the instrument under a cabi net or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes e The instrument is intended for indoor use only BURN HAZARD e Extremely cold temperatures may be present in this equipment Freezer burns and frostbite may result if personnel fail to observe safety precau tions e High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions ELECTRICAL HAZARD e These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged into a 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
45. ehold office and laboratory appliances 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 DO NOT overfill the bath Overflowing extremely cold or hot fluid may be harmful to the operator See Section 5 3 Bath Preparation and Filling for specific instructions Follow all safety guidelines listed in the user s manual Calibration Equipment should only be used by Trained Personnel If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired Before initial use or after transport or after storage in humid or semi hu mid environments or anytime the instrument has not been energized for Hart Scientific 6330 1 Before You Start more than 10 days th
46. er 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 15 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 6 Bath Use 6 3 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 totally eliminated Even though all baths have horizontal and vertical gradients these gradients are minimized inside the bath work area Nevertheless probes should be inserted to the same depth in the bath
47. erature drops and it is manually reset then the cutout circuitry or the cutout thermocou ple sensor may be faulty or disconnected Contact a Hart Authorized Ser vice Center see Section 1 3 for assistance The display flashes c uk out and an incorrect process temperature The problem may be that the controller s voltmeter circuit is not function ing properly A problem could exist with the memory back up battery If the battery voltage is insufficient to maintain the memory data may be come scrambled causing problems A nearby large static discharge may also affect data in memory Holding the SET and EXIT keys down while power to the controller is switched on may reset the memory The display shows 1 n t in dicating the memory is being initialized At this point each of the control ler parameters and calibration constants must be reprogrammed into memory You can obtain the calibration constants from Report of Test If the problem reoccurs the battery should be replaced Contact a Hart Authorized Service Center see Section 1 3 for assistance If initializing the memory does not remedy the problem there may be a failed elec tronic component Contact a Hart Authorized Service Center see Section 1 3 for assistance The displayed process temperature is in error and the controller re mains in the cooling or the heating state at any set point value Possible causes may be either a faulty control probe or
48. 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 be tween pins 1 and 2 on the probe connector and 0 2 to 2 0 ohms between pins 3 and 4 The resistance should read from 100 to 300 ohms between pins 1 and 4 depending on the temperature If the probe is defective con tact a Hart 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 display flashes cutout and an incorrect process temperature If the problem re mains the cause may be a defective electronic component contact a Hart Authorized Service Center see Section 1 3 for assistance Hart Scientific 6330 13 2 13 2 1 13 Troubleshooting Problem Causes and Solutions The controller controls or attempts to control at an inaccurate temperature The controller operates normally except when controlling at a specified set point At this set point the temperature does not agree with that measured by the user s reference thermometer to within the specified ac curacy This problem may be caused by an actual difference in tempera ture between the points where the control probe and t
49. es 9 Controller Operation Press UP or DOWN to change the units Change units New units selected Press SET to accept the new selection and resume displaying the bath temperature SET Set the new units and resume temperature display 9 5 Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simulta neously and then releasing The first function in the secondary menu is the heater power display 9 6 Heater Power The temperature controller controls the temperature of the bath by pulsing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time This value may be estimated by watching the red green control indicator light or read di rectly from the digital display By knowing the amount of heating the user can tell if the bath is heating up to the set point cooling down or controlling at a constant temperature Monitoring the percent heater power allows the user to 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 SET Acces
50. es may be added within command strings and are ignored Backspace BS ASCII 8 may be used to erase the previous character terminating CR is im plied with all commands Hart Scientific 10 Digital Communication Interface Table 4 Interface Command Summary Command Command Returned Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set point s etpoint 5 set 9999 99 Cor F set 150 00 C Set current set point to n s etpoint 2 n s 450 Instrument Range Read vernier v ernier Y v 9 99999 v 0 00000 Set vernier to n v ernier 2n v 00001 Depends on Configuration Read temperature t emperature t t 9999 99 Cor F 1 55 69 C Read temperature units v nits U U X Set temperature units v nits c f CorF Set temperature units to Celsius v nits 2 c u C Set temperature units to Fahrenheit v nits f u f Secondary Menu Read proportional band setting pr op band pr pb 999 9 pb 15 9 Set proportional band to n pr op band pr 8 83 Depends on Configuration Read cutout setting c 9999 c 620 C in Set cutout setting c utout n r eset Set cutout to degrees c utout 2 n c 500 Temperature Range Reset cutout now c utout r eset r Read heater power po wer po po 9999 1 duty cyde Configuration Menu Probe Menu Read RO calibratio
51. f the outside of the bath becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint Periodically check the fluid level in the bath to ensure that the level has not dropped A drop in the fluid level affects the stability of the bath Changes in fluid level are dependent upon several factors specific to the 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 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 base line for knowledge of bath operation with clean usable fluid Once some fluids have become compromised the break down can occur rapidly Par ticular attention should be paid to the viscosity of the fluid A significant change in the viscosity can indicate that the fluid is contaminated being used outside of its temperature limits contains ice particles or is close to a chemical breakdown Once data has been gathered a specific mainte nance schedule can be outlined for the instrument Refer to General Oper ation Section 8 for more information about the different types of fluids used in calibration baths If a hazardous material is spilt on or inside the
52. for good temperature uniformity and fast controller response The stirrer is precisely adjusted for optimum performance 8 3 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 8 4 Heater The power to the bath heater is precisely controlled by the temperature control ler to maintain a constant bath temperature Power is controlled by periodically switching the heater on for a certain amount of time using a solid state relay The front panel red green control indicator shows the state of the heater The control indicator glows red when the heater is on and glows green when the 32 Hart Scientific 8 General Operation heater is off The indicator pulses constantly when the bath is maintaining a st
53. hermometer 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 in serted into the bath to minimize temperature gradient errors Check that the calibration parameters are all correct according to the Report of Test If not re program the constants The memory backup battery may be weak causing errors in data as described in the prob lem The display flashes cutout and an incorrect process tempera ture Check that the control probe has not been struck bent or damaged If the cause of the problem remains unknown contact a Hart Authorized Service Center see Section 1 3 for assistance The controller shows that the out put power is steady but the process temperature is unstable If the bath temperature does not achieve the expected degree of stability when measured using a thermometer try adjusting the proportional band fo a narrower width as discussed in Section 9 7 Proportional Band The controller alternately heats for a while then cools The proportional band being too narrow typically causes this oscillation Increase the width of the proportional band until the temperature stabi lizes as discussed in Section 9 7 Proportional Band The controller erratically heats then
54. his 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 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 31 8 General Operation 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 the open or closed cup flash point Refer to the flash point discussion in Section 8 1 8 Safety Boiling Point At or near the boiling point of the fluid the temperature stability 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 point at which decomposition of the fluid begins Further increasing the temperature may accelerate decomposi tion to the point of danger or impracticality 8 2 Stirring Stirring of the bath fluid is very important for stable temperature control The fluid must be mixed well
55. iformity 0 007 C at 100 C oil 5012 0 015 C at 200 C oil 5017 0 020 C at 300 C oil 5017 Heating Time 250 minutes from 35 C to 300 C oil 5017 Cooling Time 480 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 0 5 C Digital Setting Repeatability 0 01 C Heater 650 Watts Access Opening 6 8 x 3 7 172 x 94 mm Depth 925 234 mm Wetted Parts 304 Stainless Steel Power 115 VAC 2 109 50 60 Hz 7 Amps 230 VAC 10 50 60 Hz 3 5 Amps 670 W Volume 2 4 gallons 9 2 liters Weight 42 lb 19 kg Size 12x 21 5 x 18 5 inches 305 x 546 x 470 mm off cart 12 x 21 5 x 32 25 inches 305 x 546 x 819mm on cart Safety OVERVOLTAGE Installation CATEGORY II pollution Degree 2 per IEC 1010 1 Interface Package RS 232 included IEEE 488 optional tRated at listed 115 V or optional 230 V 3 Specifications and Environmental Conditions 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 in an excessively dusty or dirty environment Maintenance and clean ing recom
56. mendations 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 809 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 Hart Scientific Inc Hart warrants this product to be free from defects in ma terial and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment This warranty extends only to the original purchaser and shall not apply to any product which in Hart s sole opinion has been subject to misuse alteration abuse or abnormal conditions of operation or handling Software is warranted to operate in accordance with its programmed instruc tions on appropriate Hart products It is not warranted to be error free Hart s obligation 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 condi tions or operation or handling Hart will repair the product and bill the pur chaser for
57. n g 156 25 999 9 to 999 9 Read low set point limit value tl ow 1 tl 999 tl 80 Set low set point limit to n tl ow n 80 999 9 to 999 9 Read high set point limit value th igh th th 999 th 205 Set high set point limit to n th igh n th 205 999 9 to 999 9 Miscellaneous not on menus Read firmware version number ver sion ver ver 9999 9 99 ver 2100 3 56 Read structure of all commands h elp h list of commands Legend Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user Note 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 56 Hart Scientific 6330 11 2 11 3 11 Calibration Procedure Calibration Procedure In some instances the user may want to calibrate the bath to improve the tem perature set point accuracy Calibration is done by adjusting the controller probe calibration constants 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
58. n 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 Hart Scientific 100 8 0 100 C 200 C 300 C 400 C 500 C 600 C Silicone Oil 710 Silicone Oil 200 50 Silicone Oil 200 20 Silicone Oil 200 10 Silicone Oil 200 05 Silicone Oil Halocarbon Mineral Oil Water Methanol Ethylene Glycol 50 50 with H20 FL 302 C 10 FL 280 p 4 10CS FL 232 C FL 163 C FL 133 C FL 232 Bath Salt Decomposition Starts Shaded area represents usable range of fluid starting at 50 BP Boiling Point centistokes Lighter shading represents decreasing viscosity while CS Centistokes vaporization and decomposition increase EP Evaporation Point fluid loss due to evaporation too high FL Flash Point FR Freeze Point PP Pour Point Black area represents liquid range with excessive viscosity Range over which a fume hood is recommended Figure Chart Showing Usable Range Of Various Fluids 6330 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 T
59. n parameter r 0 r r0 999 999 0 100 578 Set calibration parameter to n r 0 2n 100 324 98 0 to 104 9 Read ALPHA calibration parameter al pha al al 9 9999999 al 0 0038573 Set ALPHA calibration parameter fon al pha n al 0 0038433 00370 to 00399 Operating Parameters Menu Read cutout mode cm ode cm cm xxxx cm AUTO Set cutout mode rfeset a uto RESET or AUTO Set cutout to be reset manually cm ode cm r Set cutout to be reset automatically cm ode a uto cm a Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting to n seconds sa mple 2n sa 0 0 to 4000 Set serial duplex mode du plex f ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to half du plex h alf du h 6330 55 10 Digital Communication Interface Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set serial linefeed mode Iffeed on of f ON or OFF Set serial linefeed mode to on If eed on If on Set serial linefeed mode to off If eed of f lf of Calibration Menu Read C0 calibration parameter 0 0 b0 9 b0 0 Set CO calibration parameter to n 0 0 0 999 9 to 999 9 Read CG calibration parameter ag g bg 999 99 bg 156 25 Set CG calibration parameter to n qg
60. or 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 t 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 Computing RO and ALPHA Before computing the new values for Ry and ALPHA the current values must be known The values may be found by either accessing the probe calibration 57 11 Calibration Procedure 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 in the future The new values and ALPHA are computed by entering the old values for R and ALPHA the calibration temperature set points t and tj and the temperature errors err and erry into the following equations RO ty t 1 ALPHA ty err 1 ALPHA t err ALPHA d ALPHA ty For example 1f RO and ALPHA were previously set for 100 000 and 0 0038500 respectively and the data for t ty and erry were as given above then the new values RO 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 t and ty and measuring th
61. or optimum performance with a variety of fluids at se lected temperatures The proportional band adjustment may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional band SET Access heater power in secondary menu To change the proportional band press UP or DOWN Table 3 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 Hart Scientific 6330 9 8 9 Controller Operation Decrement display 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 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 temperatu
62. outh East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 83 Clemenceau Avenue 15 15 06 Ue Square 239920 SINGAPORE Phone 465 737 2922 Telefax 465 737 5155 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available Model Number Serial Number Voltage Complete description of the problem Hart Scientific 6330 2 Introduction Introduction The Hart Scientific Model 6330 is a bench top 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 with extreme stability The tem perature controller uses a microcontroller to execute the many operating functions User interface is provided by the 8 digit LED display and four key switches Digital remote communications is available with an RS 232 or optionally with an IEEE 488 interface The 6330 bath was designed to be compact and low cost without compromising performance The bath operates over a wide temperature range from 35 C to 300 3 Specifications and Environmental Conditions 6330 3 Specifications and Environmental Conditions 3 1 Specifications Runge 35 C to 300 C Stability 2 sigma 0 005 C at 100 C oil 5012 0 010 C at 200 C oil 5017 0 015 C at 300 C oil 5017 Un
63. pecific 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 cooling The proportional band may require some adjustment depending on the specific heat of the fluid 8 1 4 Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid Ther mal conductivity of the fluid affects the control stability temperature unifor mity and temperature settling time Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance 8 1 5 Thermal Expansion Thermal expansion describes how 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 It may be dangerous to permit the fluid to overflow the tank It may also cause loss of valuable bath fluid Excessive thermal expansion may also be undesir able in applications where constant liquid 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 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 D Dg K T
64. perature 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 in jury 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 8 General Operation 8 1 9 8 1 10 8 1 10 1 8 1 10 2 8 1 10 3 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 oxygen and an ig nition source are less available inside the tank the close
65. 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 Autho rized Service Center see Section 1 3 for assistance 13 Troubleshooting Problem Causes and Solutions The controller display flashes cutout and the heater does not operate The display flashes c ut o u E alternately with the process tempera ture If the process temperature displayed seems grossly in error consult the following problem The display flashes cutout and an incorrect pro cess temperature Normally the cutout disconnects power to the heater when the bath tem perature 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 RE SET the heater only comes on again when the temperature is reduced and the cutout is manually reset by the operator see Section 9 8 Cutout Check that the cutout set point is adjusted to 10 or 20 C above the maxi mum 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 temp
66. r 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 58 Bath temperature display When is pressed the display shows the set point memory that 15 cur rently being used and its value Eight set point memories are available SET Access set point selection 250 i Setpoint 1 25 0 C currently used Press to select this memory and access the set point value SET 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 Store new set point access vernier 0 00000 Current vernier value Press EXIT and the bath temperature is displayed again Hart Scientific 6330 4 Quick Start 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 8 Cutout To obtain optimum control stability adjust the proportional band as discussed in Section 9 7 Proportional Band 6330 5 1 5 2 5 3 5 Installation Installation Caution READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incor
67. re between 41 F and 104 F 5 C to 40 C Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument DO NOT overfill the bath Overflowing liquid may damage the electrical system Be sure to allow for thermal expansion of the fluid as the bath temperature increases See Section 5 3 Bath Preparation and Filling for specific instructions Read Section 6 Bath Use before placing the unit into service DO NOT change the values of the bath calibration constants from the fac tory set values The correct setting of these parameters is important to the safety and proper operation of the unit The refrigeration may be damaged or the lifetime shortened if the set point temperature is set above 60 C for more than one hour with the refrigeration manually on Ensure that the refrigeration is off when the unit is used above 60 C The Factory Reset Sequence should be performed only by authorized personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Test to restore the test pa rameters DO NOT operate this instrument in an excessively wet oily dusty or dirty environment 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 fluid Use the handles pro Hart Scientific 1 Before You St
68. re cutout This 1s not adjustable by software but 1s adjusted with an internal potentiometer For the 6330 bath this parameter should read 310 9 14 2 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 9 14 3 H and L These parameters set the upper and lower set point limits of the bath DO NOT change the values of these parameters from the factory set values To do so may present danger of the bath overheating and causing damage or fire 6330 49 6330 10 10 1 10 1 1 10 1 2 10 Digital Communication Interface Digital Communication Interface The 6330 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 s
69. rect handling can damage the bath and void the warranty Bath Environment Model 6330 Bath is a precision instrument which should be located in an appropriate environment The location should be free of drafts extreme temper atures and temperature changes dirt etc The surface where the bath is placed must be level Because the bath is designed for operation at high temperatures keep all flam mable and meltable materials away from the bath Although the bath is well in sulated top surfaces do become hot Beware of the danger of accidental fluid spills If used at high temperatures a fume hood should be used to remove any vapors given off by hot bath fluid Dry out 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 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 degree centigrade for 4 hour or more Bath Preparation and Filling The Model 6330 Bath is not provided with a fluid
70. res and most impor tantly protects the bath fluids from being heated beyond the safe operating tem perature 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 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 setting of the cutout mode parameter The cut out has two modes automatic reset or manual reset If the mode is set to auto matic 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 re mains 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 T pr Access heater power in secondary menu Pek Heater power in percent 9 Controller Operation SET Access cutout set point 0 2105 i Cutout set point To accept the new cutout set point pre
71. s heater power in secondary menu 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 40 Hart Scientific 9 Controller Operation 9 7 Proportional Band In a proportional controller such as this the heater output power is proportional to the bath temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bot tom of the proportional band the heater output is 100 At the top of the pro portional band the heater output is 0 Thus as the bath temperature rises the heater power is reduced which consequently tends to lower the temperature back down In this way the temperature is maintained at a fairly constant temperature The temperature stability of the bath depends on the width of the proportional band see Figure 5 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
72. ss SET SET Accept cutout set point The next function is the configuration menu Press EXIT to resume display ing the bath temperature 9 9 Controller Configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via the front panel These are ac cessed from the secondary menu after the cutout set point function by pressing SET The display prompts with CO n F16 Press SET once more There are five sets of configuration parameters probe parameters operating parame ters serial interface parameters IEEE 488 interface parameters and controller calibration parameters The menus are selected using the and DOWN keys and then pressing SET 9 10 Probe Parameters The probe parameter menu is indicated by 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 44 Hart Scientific
73. 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 i Bath temperature in degrees Celsius To change the set point memory press UP or DOWN Increment memory 9 Controller Operation 40 0 i Newset point memory 4 40 0 Press SET to accept the new selection and access the set point value SET Accept selected set point memory 9 3 2 Set point Value The set point value may be adjusted after selecting the set point memory and pressing SET The set point value is displayed with the units C or F at the left 40 00 i Set point 4 value If the set point value need not be changed then press to resume dis playing the bath temperature To adjust the set point value press or DOWN Increment display 42 50 i New set point value When the desired set point value is reached press SET to accept the new value and access the set point vernier If EXIT is pressed any changes made to the set point are ignored SET Accept new set point value 9 3 3 Set point Vernier The set point value can be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a more precise bath temperature
74. time required for the tempera ture to stabilize after inserting the probes Using the reference probe as the guide be sure that the temperature has stabilized before starting the calibration Hart Scientific 6330 7 1 7 Parts and Controls Parts and Controls Front Panel The following controls and indicators are present on the controller front panel see Figure 2 below 1 the digital LED display 2 the control buttons 3 the bath on off power switch and 4 the control indicator light POWER 6330 Figure 2 Front Panel Features 1 2 3 4 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 or F The control buttons SET DOWN UP and EXIT are used to set the bath temperature set point access and set other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows SET Used to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value are ignored The on off switch
75. top bit and no parity Wiring The serial communications cable attaches to the bath through the DB 9 connector on the rear panel Figure 6 shows the pin out of this RS 232 Cable Wiring for IBM PC and Compatibles Instrument Computer DTE connector and suggested ca Connector Connector ble wiring To eliminate DB 9 Pin DB 9 Pin noise the serial cable should ING 1868 2RxD 2 RxD be shielded with low resis 3TxD e e 3TxD tance between the connector 4NC e 4 DTR _ 5GND 5 GND DB 9 and the shield CHE Cease 7RTS 7 RTS t 8CTS 8CTS etup 9NC 9NC Before operation the serial interface of the bath must first be set up by program Instrument Computer DTE Connector Connector ming the baud rate and other DB 9 Pin DB 25 Pin configuration parameters ING e These parameters are pro 2RxD e 2TxD rene NE 3TxD e 3 RxD grammed within the serial in ARTS terface menu 5 GND e 5CTS 6NC 6 DSR To enter the serial parameter 7RTS 7 programming mode first Bero eben 9NC e 20 press EXIT while pressing SET and release to enter the secondary menu Press SET repeatedly until the Figure 6 Serial Communications Cable Wiring 10 Digital Communication Interface 10 1 2 1 10 1 2 2 10 1 2 3 10 1 2 4 10 1 3 display reads ob E This is the menu selection Press UP repeatedly until
76. troller Operation SA 50 New sample period Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full du plex or half duplex With full duplex any commands received by the bath via the serial interface are immediately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The du plex mode parameter is indicated by 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 1 indicated by IEEE 488 Parameters Baths may optionally be fitted with an IEEE 488 GPIB interface In this case the user may set the interface address 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 9 Controller Operation IEEE IEEE 488 parameters menu Press SET to enter the menu 9 13 1 Address The IEEE 488 interface must be configured to use the same address as the ex ternal communicating device The address is indicated by RddcESS IEEE 488 interface address Adjust the value with UP or DOWN and then use SET to set the address to the displayed value New IEEE 488 interface address

Access set-point memory

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