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Access set-point value

1. T 1 i Serial u gt iEEE 488 a TW Interface DOWN Interface lt pows Calibration 4 1 Menu lt lt SET SET 2 ser X 5 Y Y 2 Y Baud i Device Rate i Address EN ero SET EXIT SET EXIT w SET EXIT a Adjust i Adj Device i Address g Adjust CTO H I I SET EXIT 1 SET EXIT 2 sevexr i z Ex Sample i gt Period IEEE 488 w Y SET EXIT i Option Installed w SET EXIT ION AAA RC NN Waa g Adjust C0 B0 SEVEXT E I Duplex o Mode o SET EXIT Z ser EXIT o a AR Adjust CG BG SET EXIT i PRT Only SETIEXIT Linefeed SET EXIT gt SET EXIT an Adjust L SET EXIT 8 Controller Operation Temperature Set point 8 3 8 3 1 rESEE P Cutout reset function Press SET once more to reset the cut out SET Reset cut out This will also switch the display to the set temperature function To return to displaying the temperature press the EXIT button If the cut out is still in the over temperature fault condition the display will continue to flash cut out The bath temperature must drop a few degrees below the cut out set point be fore the cut out can be reset Temperature Set point The temperature can be set to any va
2. Command Command Returned Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set point s etpoint S set 9999 99 C or F set 150 00 C Set current set point to n s etpoint n s 450 Instrument Range Read vernier v ernier V v 9 99999 v 0 00000 Set vernier to n v ernier n v 00001 Depends on Configuration Read temperature t emperature t t 9999 99 C or F t 55 69 C Read temperature units u nits u u X uc Set temperature units u nits c f CorF Set temperature units to Celsius u nits c u C Set temperature units to u nits f u f Fahrenheit Secondary Menu Read proportional band setting pr op band pr pr 999 9 pr 15 9 Set proportional band to n pr op band n pr 8 83 Depends on Configuration Read cut out setting c utout C c 9999 x xxx c 620 C in Set cut out setting c utout n r eset Set cut out to n degrees c utout n c 500 Temperature Range Reset cut out now c utout r eset c r Read heater power po wer po po 9999 po 1 duty cycle Configuration Menu Probe Menu Read RO calibration parameter r 0 r r0 999 999 r0 100 578 Set RO calibration parameter ton r 0 n r 100 324 98 0 to 104 9 Read ALPHA calibration al pha al al 9 9999999 8l 0 0038573 parameter Set ALPHA calibration parameter al pha n al 0 0038433 00370 to ton 00399 41 2100 Temperature Controller User s Guide 2100 Controller Communications Commands conti
3. cg n cg 406 25 999 9 to 999 9 Read BO calibration parameter bO b0 b0 9 b0 0 Set BO calibration parameter ton b0 n b0 0 999 9 to 999 9 Read BG calibration parameter bg bg bg 999 99 bg 156 25 Set BG calibration parameter ton bg n bg 156 25 999 9 to 999 9 Read low set point limit value tllow tl tl 999 tl 80 Set low set point limit to n tllow n tl 80 999 9 to 999 9 Read high set point limit value th igh th th 999 th 205 Set high set point limit to n th igh n th 205 999 9 to 999 9 42 9 Digital Communication Interface Interface Commands 2100 Controller Communications Commands continued Command Command Returned Acceptable Command Description Format Example Returned Example Values 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 43 10 Calibration Procedure RTD Probe Calibration 10 10 1 10 1 1 10 1 2 10 1 3 Calibration Procedure In some instances the user may want to calibrate the co
4. 39 9 2 1 Setup and Address Selection 2 2 2 0 0002 eee eee 39 9 2 2 IEBE 488 Operation os eee ERE wD deme un e edes 40 9 3 Interface Commands ele 40 10 Calibration Procedure 45 10 1 RTD Probe Calibration lens 45 10 1 1 Calibration Potts 4x2 A ew ARAB Ba Wie a eee ae 45 10 1 2 Measuring the Set point Error gt v esst ea ee en 45 10 1 3 Computing Rand ALPHA 00000000 eee 45 10 2 Calibration Example a o c ceace atte teter eiers 46 10 3 Thermistor Probe Calibration 46 10 3 1 Calibration POMIS o a a e oS i ac SOR VE a de 46 10 3 2 Measuring the Set point Error 2 ooo 47 10 3 3 Computing DO and DG uuu kr RA 9b DR aT aS 48 10 3 4 Calibration Example s o 64 sok wal do ee hE wo xat 48 11 Maintenance 51 12 Troubleshooting 4 oom o 9 xs 53 12 1 Troubleshootng 5 99 ERIGI EX 53 121 1 The heater indicator LED stays red but the temperature does not increase 53 12 1 2 The controller display flashes CUT OUT and the heater does not operate 53 12 1 3 The display flashes CUT OUT and an incorrect process temperature 54 12 1 4 The displayed process temperature is in error and the controller remains in the cooling or heating state at any set point value 2 2 ess 54 12 1 5 The controller will not control above approximately 250 C 54 12 1 6 The controller control
5. New cut out set point ases KHEERRARERERSKBRSARRENREERRE To accept the new cut out set point press SET 7 SET Accept cut out set point The next function is the configuration menu Press EXIT to resume display ing the process temperature Controller Configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via the front panel These are ac cessed from the secondary menu after the cut out set point function by pressing SET The display will prompt with COnFIG Press SET once more There are 5 sets of configuration parameters probe parameters operating pa rameters serial interface parameters IEEE 488 interface parameters and con troller calibration parameters The menus are selected using the UP and DOWN keys and then pressing SET See Figure 3 Probe Parameters RTD Sensor The probe parameter menu is indicated by PrO bE i Probe parameters menu Press SET to enter the menu The probe parameters menu contains the pa rameters RO and ALPHA which characterize the resistance temperature rela tionship of the platinum control probe If the controller is configured to use a thermistor probe then the constants are DO and DG These parameters may be adjusted to improve the accuracy of the bath This procedure is explained in detail in Section10 The probe parameters are accessed by pressing SET aft
6. that the indicator window of the power module matches the voltage of the mains supply Ordinarily the controller is set up to be used with a metrology bath however you may want to use the controller with a dry well or other system Section13 2 discusses the appropriate Gain Range for the system Fuses The controller is shipped from the factory with two fast acting fuses 10 amp 250 V size 1 4 x 1 for 115 V 5 x 20 mm for 230 V This current rating is the maximum for the unit CAUTION NEVER use a heater stirrer combination or system which uses more than 10 amps If the controller is connected to a system which uses less than 10 amps the fuses will need to be changed in order to be correct for the system Once the controller is connected in the system the system current needs to be measured or calculated and the appropriate fuse size and characteristics selected Gener ally the fuse selected is rated at 12596 of the maximum current of the system The time current characteristics of the fuse are selected by the application Usually fast acting fuses Type F for 5 x 20 mm fuses are selected for any sys tem without a high in rush current i e hot calibration baths and time delay fuses Type T for 5 x 20 mm fuses are selected for any system with a high in rush current i e cold calibration baths The following examples are pro vided to assist you in calculating the correct fuse for the system Refer to the
7. HALF or full duplex FULL With full duplex any commands received by the bath via the serial interface will be im mediately echoed or transmitted back to the device of origin With half duplex the commands will be executed but not echoed The default setting is full du plex The mode may be changed using UP or DOWN and pressing SET Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables On or disables OFF transmission of a linefeed charac ter LF ASCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed using UP or DOWN and pressing SET Serial Operation Once the cable has been attached and the interface set up properly the control ler will immediately begin transmitting temperature readings at the pro grammed rate The serial interface operates with 8 data bits 1 stop bit and no parity The set point and other commands may be sent to the bath via the serial interface to set the controller and view or program the various parameters The interface commands are discussed in Section9 3 All commands are ASCII character strings terminated with a carriage return character CR ASCII 13 IEEE 488 Communication optional The IEEE 488 interface is available as an option Controllers supplied with this option may be connected to a GPIB type communication bus which allow
8. Hart Scientific 9 Model 2100 Temperature Controller User Manual Rev 5B2801 Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive e American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice e Copyright 2005 Printed in USA Rev 5B2801 Table of Contents 1 Before You Start 1 1 1 nttOGUCHOD s srei cm he A Ad 1 1 2 Symbols Used comicos REG yr ede OMS 1 1 3 Safety Information eA 2 13 1 WARNINGS oe ca Dak ee OX ACA ee a a e i 3 1 3 2 CAUTIONS iu 6444 amp 456 6S 1 Bede X 3 3 X x Kw x 30x Xo 4ox X 3 1 4 Authorized Service Centers lle 4 2 Specifications and Environmental Conditions 7 2 1 Specifications io o ut9 e bor m Ue ER ERN E GU RUE 7 2 2 Environmental Conditions cles 7 2 3 Watranty xus 2 X ons ok ck x pU A do n a EEG 7 3 Safety Guidelines 9 4 Quick Stam 4 ud odo Core eee RRMA ACE OE RC x RR A 4 1 Unpackifig u quts dex eu GUERRE SN ep E Quee sae eee d 11 42 Set Upe ariga 64 onem res rs ERR aso n eia 11 4 3 HeateE vos o anda Lat SER DAS wed heen O ee psa 11 4 4 Nu ao ee BSH e a Raed eas 11 4 5 PROBES an ee ss CR eR ee ee are e ee 12 4 6 POWE 63 Saw es ee EERE UE Sex oS WR RUE EE a m 12 4 7 Setting the Temperature 12 5 1
9. Service to be sure that the proposed method will not damage the equip ment 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 cut out should be checked every 6 months to see that it is working properly In order to check the user selected cutout follow the control ler directions Section8 8 for setting the cutout Both the manual and the auto reset option of the cutout should be checked Set the bath temperature higher than the cutout Check to see if the display flashes cutout and the temperature is decreasing WARNING When checking the over temperature cutout be sure that the temperature limits of the bath fluid are not exceeded Exceeding the tem perature limits of the bath fluid could cause harm to the operator lab and instrument 51 12 Troubleshooting Troubleshooting 12 12 1 12 1 1 12 1 2 Troubleshooting Troubleshooting In the event that the user of the 2100 temperature controller encounters diffi culty in operation this section may help to find and solve the problem Several possible problem conditions are described along with likely causes and solu tions If a problem arises please read this section carefully and attempt to un derstand and solve the problem Troubleshooting may require the assistance of a technician with at least a basic understanding of electronics If the
10. Guide 9 1 1 Wiring The serial communications ca T ble attaches to the controller RS 232 Cable Wiring for through the DB 9 connector IBM PC and Compatibles on the back panel Figure 5 shows the pin out of this con nector and suggested cable Instrument Computer DTE wiring To eliminate noise the Connector Connector serial cable should be shielded 099m oB ain with low resistance between Mid Hs the connector DB 9 and the 3TxD S 3TxD shield 4NC 2 5GND 5 GND X m 6 NC 6 DSR 9 1 2 Setup 7RTS TRIS Before operation the serial in NE nea terface must first be set up by programming the baud rate and other configuration pa rameters These parameters Focus Computer DTE AS onnector Connector are programmed within the se DB 9 Pin DB 25 Pin rial interface menu 1NC 2 RxD e e 2TxD To enter the serial parameter 3TXD 3RxD programming mode first press 4NC 4RTS EXIT while pressing SET 5GND 5 CTS and release to enter the sec DNE aaa PDSR ondary menu Press SET re de tE Ta peatedly until the display 9NC 20 DTR reads Pr ob E This is the i ne menu selection Press UP Figure 5 Serial Interface Cable Wiring repeatedly until the serial in terface menu is indicated with SEr IAL 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 linef
11. SEUD iS je Bs a da PRR a Eo Red we RO ee eS 8 15 5 2 Heater Stirrer ce cae erer pz RR E P AG 15 5 3 Control Probe 22 4 paee e ge quU EI RUE RD 15 54 Thermocouple cass dcc pe RR Rb Rm RR a 15 5 5 POWER Seal ce Gk See ete ee pots 15 5 6 FUSES CTI 16 6 Parts and Controls 17 6 1 Front Panel ss ha ocre a ee En 17 6 2 Rear Panel uoce uec bo Reese X xw bcd oH 6 x eG wd 18 7 General Operation 21 7 1 Control System o4 24 6 Vues e sexa e SEO RES ES 21 TAN POWePg na ss radue A Se eB aE E bre ea 21 7 3 Heater ou RGR ee Rupe o Rex ARS RUE e 21 7 4 Temperature Controller llle 22 8 Controller Operation 23 8 1 Processtemperatur amp zo oe Ron RO OUR Roe 23 8 2 ResetQuto t e a ox E a GG 23 8 3 TemperatureSet point lll 25 8 3 1 Programmable Set points o e 25 8 3 2 Setpoint Value ss a targ WAR P Xo RC Wee ee ee Oe ee e 26 8 3 3 Setpoint Vernler e a aR a RI RD ek ee eR ws 26 8 4 Temperature Scale Units llle 27 8 5 Secondary Men iue a e Se a a 28 8 6 Heater Power cidcid id aa 28 8 7 Proportional Bard ue y Rr ERE Rem 28 8 8 Cutout 4 le le es 30 8 9 Controller Configuration e e e 31 8 10 Probe Parameters RTD Sensor 31 8 10 1 RO is amp emaa a eX 4 6g Oe a Be dee Rd E OE 32 8 10 2 ALPHA IIA 32 8 11 Probe Parameters Thermistor Sensor 32 8
12. for thermistor If the setup was done correctly this should indicate the correct probe type and when the controller begins to display the process temperature the tem perature should be accurate Gain Range Normally the controller is used with systems which have fairly quick response times and require narrow proportional bands In some systems with very slow response times the proportional band may need to be set to a value larger than what is normally allowed with the controller Internal jumpers on the lower PC board allow the gain to be increased If this is necessary please contact an Au thorized Service Center for assistance 57
13. fuseology section of your fuse catalog for help in determining fuse size and characteristics or contact Hart Customer Service for assistance Once the cor rect fuse characteristics and rating of the fuses have been selected and the ap propriate fuses placed in the power entry module of the controller mark the controller so the user can visibly see the fuse size and rating for fuse replace ment Be sure to change both fuses to the new rating and correct characteristic Example when using the power of the system P Power of the system Total Watts V Nominal line voltage 115 VAC or 230 VAC I Fuse current 125x I 03V Example when using the system current I System current IF Fuse current rating 125x 1 I 6 Parts and Controls Front Panel 6 1 Parts and Controls Front Panel The following controls and indicators are present 1 the digital display 2 the control buttons and 3 the control indicator light see Figure 1 1 The digital display is an important part of the temperature controller be cause it not only displays set and actual temperatures but also various controller functions settings and constants The display shows temperatures in values ac cording to the selected scale C or F 2 The control buttons SET DOWN UP and EXIT are used to set the tem perature set point access and set other operating parameters and access and set calibration parameters Setting th
14. power the controller The controller can use a maximum of 10 amps at 115 230 VAC 10 50 60 Hz WARNING The controller does not come with a system cut out The user should provide a bi metal cut out or other safety device for the system A CAUTIONS To avoid possible damage to the instrument follow these guidelines If the controller is used to control a calibration bath or dry well Hart recom mends a dry out period once the controller is attached to the system The sys tem needs to be energized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 The controller is shipped from the factory with two fast acting fuses 10 amp 250 V size 1 4 x 1 for 115 V 5 x 20 mm for 230 V This current rating is the maximum for the unit NEVER use this unit in a system that uses more than 10 amps If the controller is connected to a system which uses less than 10 amps the fuses will need to be changed in order to be correct for the system Once the controller is connected in the system the system current needs to be measured or calculated and the appropriate fuse size and characteristics selected Gener ally the fuse selected is rated at 125 of the maximum current of the system 2100 Temperature Controller User s Guide 1 4 The time current characteristics of the fuse are selected by the application Usually fast acting fuses Type F for 5 x 20 mm fuses are sel
15. power to the heater if the system temperature exceeds a set value This protects the heater and system materials from excessive temperatures The cut out temperature is programmable by the operator from the front panel of the controller It must always be set below the upper temperature limit of the system components If the cut out is activated because of excessive temperature then power to the heater will be shut off and the system will cool It will cool until it reaches a few degrees below the cut out set point temperature At this point the action of the cut out is determined by the setting of the cut out mode parameter The cut out has two modes automatic reset or manual reset If the mode is set to automatic then the cut out will automatically reset itself when the system tem perature falls below the reset temperature allowing the system to heat up again If the mode is set to manual then the heater will remain disabled until the user manually resets the cut out The cut out set point may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET twice to access the cut out set point fexr Access heater power in secondary menu SET Access cut out set point 8 Controller Operation Controller Configuration 8 9 8 10 CO 210l Cutout set point To change the cut out set point press UP or DOWN Decrement display CEUs 95
16. probe may be considered With the thermistor probe the set point resolution is 0 002 C and the control stability may be as good as 0 0005 C for fluid baths However the temperature range with the thermistor probe is only 10 C to 110 C The thermistor probe used with the 2100 controller must be a special linearized thermistor probe This probe is available from Hart Scientific as model number 2611 The probe contains a set of thermistor sensors configured to produce an output voltage roughly linear with respect to temperature Because of this it is not necessary for the controller to be calibrated to be fairly accurate when using the thermistor probe To use the thermistor probe the controller must be appropriately configured This involves switching a switch inside the controller box This procedure is as follows e Turn off the power and unplug the unit from the power source Remove the four screws on the top cover Remove the top cover Slide the top panel forward exposing the internal electronics e Switch the slide switch on the lower printed circuit board to the desired probe type PT for platinum and TH for thermistor e Plug the appropriate probe into the probe socket on the back of the con troller e Slide the top panel back in place and reinstall the screws When the controller is turned on the display will briefly show which type of probe it is set to use displaying Pt HI for platinum RTD and CP 1
17. shipped from the factory with 10 A 250 V F fuses Additional information on fuse usage is in Section1 3 3 and Section5 6 A The appropriate power cord with IEC connector has been included with the controller for the voltage specified in the order 115V US 230V European B The double pole single throw DPST power switch indicates the ON OFF positions with the universal I O C The power entry module is provided with a dual voltage selector inte grated into the fuse holder The controller has been specially designed to allow either 115 or 230 VAC operation The voltage indicator window no tifies the user of the voltage selected See Figure 2 Two fuses are contained in the internal fuse holder The fuse holder will accept either 1 4 x 1 1 4 or 5 x 20 mm fuses Access to the fuses and the voltage se lector is obtained by placing a flathead screwdriver in the slot at the top of the power entry module and opening the module front panel HEATER 3 STIRRER 4 115 230V 50 60Hz 1150 2300W RS 232 115 230V 50 60Hz Figure 2 Back panel features 6 Parts and Controls Rear Panel A WARNING Access to the fuses may not be obtained with the power cord plugged into the IEC power line connector 2 The solid state relay is mounted on the back panel for heat dissipation rea sons The solid state relay allows the controller to switch a large amount of AC power with a very small DC current Having no moving parts the
18. solid state re lay is quiet reliable durable and resistant to vibration 3 The heater socket is the source of controlled power for the system heater This power is switched by the solid state relay to maintain a constant tempera ture The voltage is the same as that supplied through the power cord A For a diagram of how to wire the heater to the controller see Figure 10 An extra line cord has been included with the unit for your use 4 The stirrer socket is an auxiliary power socket for a stirring device for the bath The voltage is the same as supplied through the mains supply to the power cord THE COMBINED CURRENT OF THE HEATER AND THE STIRRER MUST NOT EXCEED 10 AMPS An extra line cord is included with the unit for your use in making this connection 5 The control probe is plugged in here Normally the probe is a DIN 43760 type RTD Optionally a thermistor probe with a much more limited temperature range but better stability is available The controller must be internally config ured to work with one type of probe or the other Probes or additional connec tors for use with the user s own probes are available from Hart For assistance in wiring an RTD to the controller see Figure 8 A probe connector has been provided for your use 6 The thermocouple cut out probe plugs in here This probe senses the system temperature for the safety cut out When the temperature exceeds the cut out set point the heater is disabled by openin
19. spectively and the data for t ty erry and erry were as given above then the new values DO and DG would be computed as 24 880 and 185 728 respec tively Program the new values DO and DG into the controller The new con stants will be used the next time the bath temperature is set Check the calibration by setting the temperature to t and ty and measuring the errors again If desired the calibration procedure may be repeated again to further im prove the accuracy Calibration Example The system is to be used between 25 and 75 C and it is desired to calibrate the controller as accurately as possible for operation within this range The current values for DO and DG are 25 229 and 0028530 respectively The calibration points are chosen to be 25 00 and 75 00 C The measured bath temperatures are 24 869 and 74 901 C respectively Refer to Figure 7 for applying equations to the example data and computing the new probe constants 10 Calibration Procedure Thermistor Probe Calibration RO 100 000 ALPHA 0 0038500 tj 10 00 C measured t 9 943 C ty 50 00 C measured t 49 874 C Compute errors err 9 943 10 00 C 0 057 C erry 49 874 50 00 C 0 126 C Compute RO 0 00385 1 Jo oo 99 9898 p 0 126 x 710 0 0 057 x 50 0 50 0 10 0 Compute ALPHA 1 0 00385 x 50 0 0 057 1 0 00385 x 10 0 0 126 50 0 710 0 1 0 00385 0 0
20. system The farther apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 20 C and 80 C are chosen as the calibration tem peratures then the controller may achieve an accuracy of say 0 2 C over the range 20 to 80 C Choosing 30 C and 70 C may allow the controller to have a better accuracy of maybe 0 05 C over the range 30 to 70 C but outside that range the accuracy may be only 0 5 C 10 Calibration Procedure Thermistor Probe Calibration RO 100 000 ALPHA 0 0038500 t 80 00 C measured t 79 843 C ty 120 00 C measured t 119 914 C Compute Errors err 79 843 80 00 C 0 157 C em 119 914 120 00 C 0 086 C Compute RO RU 0 086 x 80 0 0 157 x 120 0 120 0 80 0 Compute ALPHA 1 0 00385x120 0 0 157 1 0 00385 x 80 0 0 086 1 0 00385 1 Jon 100 115 ALPHA l 0 00385 0 0038387 120 0 80 0 Figure 6 Calibration Example Platinum RTD Probe 10 3 2 Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration temperatures First set the controller to the lower set point which we will call tj Wait for the system to reach the set point and allow 15 minutes to stabilize at that temperature Check the stabil it
21. 00 C Al Press UP or DOWN to change the set point value Increment display 4 Quick Start Setting the Temperature New set point value Press SET to accept the new value and display the vernier value The system begins heating or cooling to the new set point Store new set point access vernier 0 00000 j Current vernier value Press EXIT and the process temperature will be displayed again fex Return to the temperature display ed pa C Process temperature display The system will heat or cool until it reaches the new set point temperature The over temperature cut out should be correctly set for added safety See Section 8 8 Note To obtain optimum control stability adjust the proportional band as discussed in Section 8 7 13 5 Installation Setup 5 1 5 2 5 3 5 5 Installation Setup The 2100 controller is a precision instrument which should be located in an ap propriate environment The location should be free from excessive dirt mois ture vibration or temperature variations There should be no present danger of spilled liquids Heater Stirrer Connect the heater to the back of the controller into the socket labeled HEATER Be sure the heater cable is adequate for the amount of current re quired and that the heater is wired correctly and safely See Figure 10 on page 56 for heater wiring If applicable connect the stirring device to the back of the controller
22. 002 96 EC mark 1 3 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired 1 Before You Start Safety Information 1 3 1 1 3 2 The following definitions apply to the terms Warning and Caution e Warning identifies conditions and actions that may pose hazards to the user e Caution identifies conditions and actions that may damage the instru ment being used A WARNINGS To avoid personal injury follow these guidelines Operate the controller in room temperatures between 5 50 C 41 122 F The controller is not vented Therefore clearance for ventilation is not a require ment However do not place the controller on top of a calibration bath or dry well where it would be in direct heat Do not stack items on top of the controller If the controller is used to control a high temperature bath where fluid vapor ization is significant a fume hood should be used The controller can be used to control instruments which generate extreme tem peratures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from a calibration 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 Use only a grounded AC mains supply of the appropriate voltage to
23. 038621 ALPHA l Figure 7 Calibration Example Thermistor Probe 49 11 Maintenance 11 Maintenance The controller has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product develop ment Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments If the unit must be used in a dusty environment the controller can be sealed at the seams with a silicone sealant Sealing the controller protects the electrical components e If the outside of the controller becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the sur face which may damage the paint e Ifahazardous material is spilt on or inside the equipment the user is re sponsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material MSDS sheets ap plicable to all fluids used in the baths should be kept in close proximity to the instrument e Ifthe mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the system If there are any questions call Hart Scientific Customer Service for more information e Before using any cleaning or decontamination method except those rec ommended by Hart users should check with Hart Scientific Customer
24. 11 1 IDOL uasa AA ORS ORES Re eke beached c xa d ge 32 8 11 2 Dora xe mias aude AAA BBE Eden 32 8 2 Operating Parameters e 32 8 12 1 Cut out Reset Mode 33 8 13 Serial Interface Parameters 33 8 13 1 Baud Rate ac A A RE Rae AS CURE Rok wee CR 33 8 13 2 Sample Period wes ie a a Oe a 34 8 13 3 D plex Mod Duo ic ia AGA acia e de o a e 34 8 13 4 o MA 35 814 IEEE 488 Parameters 35 8 14 1 IEEE 488 Address o gg ccc ke oe oko ooo ox xx xxx 35 8 15 Calibration Parameters llle 36 8 15 1 CTO Sas boo SSG eS VS ES Ree kou EOS OR SNe EPOR ue Ss 36 8 15 2 COANE CG suu a exo A ee es Re ee Bh ee ee x 36 8 15 3 Maid Ly A OS he De eh Xe A WINS A NC CX XO we eS 36 8 16 OperationSummary 00000200 e 36 9 Digital Communication Interface 37 9 1 SeriaCommunications ss 000000 eee 37 9 1 1 Wings a Wa ae ER Re RA i ee daw A O 38 9 1 2 SETUP a Bist ts wage GP ae ebay qa vois ar Gn quaes qe ads E 38 9 12 Baud Rate e i 4 i oorr Ma dee eR Saw ae ek BS 38 9 1 2 2 Sample Periods s sas eye oa Soe dee wi eb le ple Rob Roe m DR Bayes Goh wos i28 39 912 3 Duplex Mode cir oes EU RE bhai aia Ged yeas lbs Mea aden aa 39 ODA A abe Sc ee eR EIE Re aye EC eS Gee oh Ge Geen SA ae eto 39 9 1 3 Serial Operation 43s que dhe ba Aaa We ale AA Se aoe eee 39 9 2 IEEE 488 Communication optional
25. Section10 If the temperature range set by the H and L parameters is limited then the cal ibration constants appear as BO and BG CO BO and CG BG are not used if the controller is configured to operate with a thermistor probe H and L These parameters set the upper and lower set point limits of the bath These pa rameters should not be set beyond the safe operating temperature limits of the system Operation Summary A complete flowchart of controller operation is shown in Figure 3 This chart may be reproduced and used as a reference and operating guide 9 Digital Communication Interface Serial Communications 9 1 Digital Communication Interface The 2100 controller is capable of communicating with and being controlled by other equipment through the digital interface The RS 232 serial interface is standard The IEEE 488 GPIB interface can be included as an option Hart recommends the use of shielded RS 232 and IEEE 488 GPIB cables for all remote communication Serial Communications The controller comes installed with an RS 232 serial interface that allows serial digital communications over fairly long distances With the serial interface the user may access any of the functions parameters and settings discussed in Chapter 7 with the exception of the BAUD rate setting The serial interface op erates with 8 data bits 1 stop bit and no parity 37 2100 Temperature Controller User s
26. anel The percent heating power may also be monitored An added safety device the over temperature cut out is also programmable This built in feature protects the system from fault conditions causing excessive temperatures by disabling the heater if the temperature sensed by a separate thermocouple probe exceeds the cut out set point Before using the 2100 controller you should understand the proper setup and operation 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 No AC Alternating Current AC DC 2100 Temperature Controller User s Guide Symbol Description li Battery Mm P CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On OPPOUPH Canadian Standards Association c Us OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re CATI fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances C TIC Australian EMC Mark The European Waste Electrical and Electronic Equipment WEEE Directive 2
27. ater stirrer combina tion or system which uses more than 10 amps If the controller is con nected to a system which uses less than 10 amps the fuses will need to be changed in order to be correct for the system Once the controller is con nected in the system the system current needs to be measured or calcu lated and the appropriate fuse size and characteristics selected Generally the fuse selected is rated at 125 of the maximum current of the system The time current characteristics of the fuse are selected by the applica tion Usually fast acting fuses Type F for 5 x 20 mm fuses are selected for any system without a high in rush current i e hot calibration baths and time delay fuses Type T for 5 x 20 mm fuses are selected for any system with a high in rush current i e cold calibration baths Refer to 2100 Temperature Controller User s Guide 10 the fuseology section of your fuse catalog for help in determining fuse size and characteristics or contact Hart Customer Service for assistance Once the correct fuse characteristics and rating of the fuses have been se lected and the appropriate fuses placed in the power entry module of the controller mark the controller so the user can visibly see the fuse size and rating for fuse replacement Be sure to change both fuses to the new rat ing and correct characteristic Once the correct fuse is selected the following information is applicable The controller is equip
28. ating DO NOT EXCEED 10 AMPS The controller is a precision instrument Although it has been designed for opti mum durability and trouble free operation it must be handled with care The instrument should not be operated in excessively dusty or dirty environments or be placed in a positions where hot or cold liquids are splashed on it If a mains supply power fluctuation occurs immediately turn off the controller Power bumps from brown outs and black outs can damage the system Wait until the power has stabilized before re energizing the controller For best accuracy the controller needs to be calibrated for the system it controls Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 1 Before You Start Authorized Service Centers E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk G fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke Sout
29. controller seems to be faulty or the problem cannot otherwise be solved then contact an Authorized Service Center NOTE It is assumed that the controller is being used to control a calibra tion bath The heater indicator LED stays red but the temperature does not increase The problem may be either insufficient heating or no heating at all Insufficient heating may be caused by the amount of cooling to the system being greater than the amount of heat the heater is capable of supplying Check that the heater is operational using a clamp on ammeter to measure the current to the heater If the heater is receiving current but not heating enough either replace the heater with one of greater rating but less than 10 A or decrease the amount of cooling to the system If the heater is not receiving power at all use a voltmeter to verify that voltage is present at the heater socket at the back of the controller If voltage is present check the heater for correct wiring An ohmmeter may help to find a disconti nuity in the wiring Check for a shorted heater The solid state relay may not be operating and needs to be replaced Contact an Authorized Service Center The controller display flashes CUT OUT and the heater does not operate The display will flash CUT OUT alternately with the process temperature If the process temperature displayed seems to be grossly in error then also consult Section 12 1 3 A problem with the thermocoupl
30. controller front panel The width may be set to discrete values in degrees C or F depending on the se lected units The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the con troller percent output power display Narrow the proportional band width to the point at which the process temperature begins to oscillate and then increase the band width from this point to 3 or 4 times wider The integral time of the controller is determined by component selection and cannot be set by the user It is fixed at approximately 300 seconds The proportional band adjustment may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional band C EXIT Access heater power in secondary menu 29 2100 Temperature Controller User s Guide 30 8 8 To change the proportional band press UP or DOWN o Decrement display A O OO To accept the new setting and access the cut out set point press SET Press ing EXIT will exit the secondary menu ignoring any changes just made to the proportional band value SET Accept the new proportional band setting Cutout As a protection against software or hardware fault shorted heater triac or user error the controller is equipped with an adjustable heater cut out device that will shut off
31. d ee j Current IEEE 488 interface address Adjust the value with UP or DOWN and then use SET to set the address to the displayed value Add 15 New IEEE 488 interface address O S RKUESEARARERRRRERE 35 2100 Temperature Controller User s Guide 36 8 15 8 15 1 8 15 2 8 15 3 8 16 Calibration Parameters The operator of the controller has access to a number of the calibration and setup constants namely CTO CO CG H and L The calibration values are set at the factory and must not be altered The correct values are important to the accuracy of the bath Access to these parameters is available to the user only so that in the event that the controller s memory fails the user may restore these values to the factory settings The user should have a list of these constants and their settings with the manual The calibration parameters menu is indicated by CAL i Calibration parameters menu Press SET five times to enter the menu CTO Parameter CTO sets the calibration of the over temperature cut out This is not adjustable by software but is adjusted with an internal potentiometer 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 Ry and ALPHA according to the procedure given in
32. e control temperature is done directly in degrees of the current scale It can be set to one hundredth of a degree Celsius The functions of the buttons are as follows SET Used to display the next parameter in the menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored 3 The Control Indicator is a two color light emitting diode This indicator lets the user visually see the ratio of heating to cooling When the indicator is red the heater is on and when it is green the heater is off and the system is cooling 2100 TEMPERATURE CONTROLLER Hart Scientific 1 Figure 1 Front panel features 17 2100 Temperature Controller User s Guide 6 2 Rear Panel The following features are found on the rear panel of the controller 1 power entry module 2 the solid state relay 3 the heater power connector 4 the stirrer power connector 5 the control probe input connector 6 the cut out thermocouple connector 7 the optional IEEE 488 GPIB interface connector 8 the RS 232 interface connector and 9 the serial number label see Figure 2 1 The power entry module includes A the IEC power line connector B the ON OFF switch C the voltage selector with indicator window and two fuses The unit is
33. e output power is steady but the process temperature is unstable The gain may be increased to achieve better control stability See the sections on GAIN in this manual for information on gain adjustment If the gain is at the maximum limit but control is still not good the gain range may need to be ad justed by changing electronic components Contact an Authorized Service Center The controller alternately heats for a while then cools The gain is probably too high causing the system to oscillate Lower the gain until the oscillation stops In some systems with large mass and slow response the gain must be lowered significantly to achieve steady control without oscilla tion If the gain is set as low as and the system still oscillates the gain range may need to be changed Contact an Authorized Service Center The controller erratically heats then cools control is unstable If both the process temperature and output power do not vary periodically but in a very erratic manner the problem may not be oscillation due to instability but excess noise in the system Noise due to the control sensor should be less than 0 001 C However if the probe has been damaged an intermittent short may have developed causing erratic behavior Intermittent shorts in the heater or electronic circuitry in the controller may also be a possible cause If feasible try replacing the probe or heater In fluid baths improper stirring and or uneven heating or c
34. e probe the cut out operation or the cut out circuitry may cause the cut out to remain in this condition Check that the thermocouple probe is plugged into the controller and wired cor rectly Check that the probe temperature is well below the programmed set point If not then reset the cut out temperature to a value well above the probe temperature or wait for the temperature to cool well below the cut out set point If the cut out is set for manual reset mode then after the temperature cools the user must also manually reset the cut out according to the directions in this manual under the section on the cut out If the probe is not connected to 53 2100 Temperature Controller User s Guide 54 12 1 3 12 1 4 12 1 5 the controller either plug in the appropriate thermocouple probe into the cut out probe socket or use a wire jumper inserted into the socket to short the input to simulate a probe at ambient temperature If everything appears OK the electronic hardware may have developed a fail ure Contact an Authorized Service Center The display flashes CUT OUT and an incorrect process temperature The problem may be that the controller s voltmeter circuit is not functioning properly A problem could exist with the memory back up battery If the battery power is insufficient to maintain the memory data may become scrambled causing all sorts of strange symptoms A large static discharge may also affect data in memo
35. ected for any sys tem without a high in rush current i e hot calibration baths Time delay fuses Type T for 5 x 20 mm fuses are selected for any system with a high in rush current i e cold calibration baths Refer to the fuseology section of your fuse catalog for help in determining fuse size and characteristics or con tact Hart Customer Service for assistance Once the correct fuse characteristics and rating of the fuses have been selected and the appropriate fuses placed in the power entry module of the controller mark the controller so the user can visibly see the fuse size and rating for fuse replacement Be sure to change both fuses to the new rating and correct characteristic Once the correct fuse is selected the following information is applicable The controller is equipped with operator accessible fuses If a fuse blows it may be due to a power surge or failure of a component Replace the fuses once If a fuse blows a second time it is likely caused by failure of a component As a test disconnect the heaters and apply power to the rest of the system Check to see if the fuse s blew Connect the heaters one at a time Check each time to see 1f the fuse s blew If the fuse s blow only when the heaters are connected the fault may be in the heaters If not contact Hart Scientific Customer Service Always replace the fuse with one of the same rating voltage and type Never replace the fuse with one of a higher current r
36. eed parameters 9 1 2 1 Baud Rate 38 The baud rate is the first parameter in the menu The display will prompt with the baud rate parameter by showing BA U d Press SET to choose to set the baud rate The current baud rate value will then be displayed The baud rate of the serial communications may be programmed to 300 600 1200 or 2400 baud The baud rate is pre programmed to 1200 baud Use UP or DOWN to change the baud rate value Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu 9 Digital Communication Interface IEEE 488 Communication optional 9 1 2 2 9 1 2 3 9 1 2 4 9 1 3 9 2 9 2 1 Sample Period The sample period is the next parameter in the menu and prompted with SAm PLE The sample period is the time period in seconds between temperature measurements transmitted from the serial interface If the sample rate is set to 5 for instance then the controller will transmit the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample pe riod 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 d U P L The duplex mode may be set to half duplex
37. er the name of the pa rameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After the desired value is reached press SET to set the parameter to the new value Pressing EXIT will cause the parameter to be skipped ignoring any changes that may have been made 31 2100 Temperature Controller User s Guide 8 10 1 RO This probe parameter refers to the resistance of the control probe at 0 C Nor mally this is set for 100 000 ohms 8 10 2 ALPHA 32 8 11 8 11 1 8 11 2 8 12 This probe parameter refers to the average sensitivity of the probe between O and 100 C Normally this is set for 0 00385 C Probe Parameters Thermistor Sensor The probe parameter menu is indicated by PrObE Probe parameters menu Press SET to enter the menu The probe parameters menu contains the pa rameters DO and DG These parameters characterize the transfer function of the linearized thermistor control probe The parameters may be adjusted to im prove the accuracy of the bath This procedure is explained in detail in Section10 The probe parameters are accessed by pressing SET after the name of the pa rameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After the desired value is reached press SET to set the parameter to the new value Pressing EXIT will cause the parameter to be skipped ignoring any chan
38. figuration is not as desired contact an Autho rized Service Center The configuration is set by the placement of PC board jumpers inside the controller The controller will not control above approximately 250 C The range for a thermistor probe is 10 to 110 C For an RTD probe the range is either 100 to 200 C or 100 to 600 C depending on the configuration as discussed in item12 1 4 If the configuration is incorrect call an Authorized Service Center 12 Troubleshooting Troubleshooting 12 1 6 12 1 7 12 1 8 12 1 9 The controller controls or attempts to control at an inaccurate temperature Check that the calibration parameters are all correct according to the certifica tion sheet If not reprogram the constants The memory backup battery may be weak causing errors in data as described in Section 12 1 3 If the user s own probe is used the calibration parameters namely Ry and AL PHA may need to be adjusted to more closely match the characteristics of the probe Calibration assistance may be obtained from an Authorized Service Cen ter If the probe was purchased from Hart and the parameters all agree with the certification sheet but the controller does not meet the specification then the controller may need to recalibrated If this is the case rough handling in ship ping may have caused shock to the probe or sensitive electronic components Contact an Authorized Service Center The controller shows that th
39. first parameter in the menu The baud rate setting deter mines the serial communications transmission rate The baud rate parameter is indicated by BRUd Serial baud rate parameter Press SET to choose to set the baud rate The current baud rate value will then be displayed 1200 b Current baud rate O AE The baud rate of the serial communications may be programmed to 300 600 1200 or 2400 baud Use UP or DOWN to change the baud rate value 33 2100 Temperature Controller User s Guide 34 8 13 2 8 13 3 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 Sample Period The sample period is the next parameter in the serial interface parameter menu The sample period is the time period in seconds between temperature measure ments transmitted from the serial interface If the sample rate is set to 5 for in stance then the controller will transmit the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by SAMPLE j Serial sample period parameter A TOO Press SET to choose to set the sample period The current sample period value will be displayed SA Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the
40. g a relay inside the controller This feature should be utilized for added safety The thermocouple probe is type K Probes and connectors are available from Hart Scientific If the cut out feature of the controller is not used the thermocouple input must be shorted with a wire jumper in order for the controller to continue to function see Figure 9 7 The optional IEEE 488 GPIB interface connector for remote computer control 8 The RS 232 communications cable is connected to this 9 pin D subminia ture connector This enables the controller to be programmed and operated remotely 9 The serial number label is located on the bottom of the unit towards the back panel 19 7 General Operation Control System 7 1 7 2 7 3 General Operation Control System The 2100 temperature controller is not specified for use with a particular sys tem Its flexibility enable it to be used with a large variety of control systems Often the controller is used with a precision constant temperature bath It is the responsibility of the user to ensure that the components are chosen and the system constructed to ensure safe and proper operation of the complete sys tem The user should have a good knowledge of and experience with electrical fundamentals and wiring practice as well as control systems Hart Scientific cannot be responsible for any damages or injury resulting from improper de sign or operation of the control system Technica
41. ges that may have been made DO This parameter refers to the temperature at which the control probe output would be 0 Normally this is set for 25 229 DG This probe parameter refers to the temperature span of the probe between 0 and 100 output Normally this is set for 186 794 Operating Parameters The operating parameters menu is indicated by PAr i Operating parameters menu NUSESVSREERUREENENSRRREEKERSERRKER E Press SET to enter the menu The operating parameters menu contains the cut out reset mode parameter 8 Controller Operation Serial Interface Parameters 8 12 1 8 13 8 13 1 Cut out Reset Mode The cut out reset mode determines whether the cut out resets automatically when the system temperature drops to a safe value or must be manually reset by the operator The parameter is indicated by Ckor St Cut out reset mode parameter pred Press SET to access the parameter setting Normally the cut out is set for au tomatic mode pred A Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SErIRL Serial RS 232 interface parameters menu The serial interface parameters menu contains parameters which determine the operation of the serial interface These controls only apply to controllers fitted with the serial interface The parameters in the menu are baud rate sample period duplex mode and linefeed Baud Rate The baud rate is the
42. h East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 403 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antngOsinga fluke com When contacting these Service Centers for support please have the following information available e Model Number 2100 Temperature Controller User s Guide e Serial Number e Voltage e Complete description of the problem 2 Specifications and Environmental Conditions Specifications 2 1 2 2 2 3 Specifications and Environmental Conditions Specifications Table 2 Specifications OperatingRange 100 to 600 C Temperature Stability 0 001 C depending on application Setpoint Accuracy 0 5 C or better Cutout Accuracy 5 C Exterior Dimensions Width 7 inches Front to back 10 inches Height 3 inches Power Requirements 115 230 VAC 10 single phase 50 60 Hz Weight 10 Ibs Control Probe 100Q PRT 4 wire thermistor optional Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions e temperature range 5 50 C 41 122 F e ambie
43. in the socket labeled STIRRER BE SURE THAT THE COM BINED CURRENT OF THE HEATER AND STIRRER DOES NOT EX CEED 10 AMPS Control Probe Connect the control probe into the socket at the back of the controller labeled PROBE see Figure 8 on page 56 Insert the probe into the bath or system to be controlled For best stability and response time the control probe should be located in close proximity to the heater Observe the maximum temperature rat ing of the probe and be careful it is not exceeded Normally the 2100 controller is set up to use a 100 platinum probe If better resolution and stability are desired the 2100 may alternately be configured to use Hart s 2611 linearized thermistor probe The controller operating tempera ture range with the thermistor probe is 10 C to 110 C For information on setup for the thermistor probe see Section13 Thermocouple Connect the optional thermocouple cut out probe to the back of the controller to the connector labeled TC Insert the probe into the bath or system being controlled If the safety cut out feature is not to be used then this input must be shorted with a small wire jumper in order for the controller to operate properly see Figure 9 on page 56 Power Connect the controller power cord to a power source of the appropriate voltage and current rating This can be 115 230 VAC 10 50 60 Hz Check to see 15 2100 Temperature Controller User s Guide 16 5 6
44. is the heater power display Heater Power The temperature controller controls the temperature of the system 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 directly from the digital display By knowing the amount of heating the user can tell if the system is heating up to the set point cooling down or con trolling at a constant temperature Monitoring the percent heater power will let the user know how stable the temperature is 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 will be displayed as a percentage of full power ser EXIT Access heater power in secondary menu ig Pet i Heater power in percent To exit out of the secondary menu press EXIT To continue on to the propor tional band setting function press SET Return to temperature display Proportional Band In a proportional controller such as this the heater output power is proportional to the process 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 ba
45. l support for setting up and operating a control system using the 2100 controller is available by telephone or fax from Hart Scientific Be sure to read the 2100 user manual Power Power to the controller is provided by an AC mains supply of 115 230 VAC 10 50 60 Hz Power to the controller passes through an internal filter to prevent switching spikes from being transmitted to other equipment To turn on the controller switch the control panel power switch to the ON posi tion The LED display will begin to show the process temperature and the heater will turn on or off until the bath temperature reaches the programmed set point When powered on the control panel display will briefly show a four digit num ber This number indicates the number of times power has been applied to the bath Also briefly displayed is data which indicates the controller hardware configuration This data is used in some circumstances for diagnostic purposes Heater The power to the system heater plugged into the back of the controller is pre cisely controlled to maintain a constant system temperature Power is con trolled 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 heater is off The indicator will pulse constantly when the controller is main taining a
46. lue within the range as given in the specifi cations with a high degree of resolution The temperature range of the particu lar 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 addi tion the cut out temperature should also be set below the upper limit of the fluid Setting the temperature involves three steps 1 select the set point memory 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 system to a previously programmed temperature To set the 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 08 i Process temperature in degrees Celsius i 85 0 Set point memory 1 25 0 C currently used To change the set point memory press UP or DOWN Increment memory 4 40 0 New set point memory 4 40 0 C NEWFREREEERRAS ER ERE BENEARREENRERRERN Press SET to accept the new selection and access the set point value 25 2100 Temperature Controller User s Guide 26 8 3 2 8 3 3 SET Accept selected set point memory Set p
47. ly An RTD thermistor optional control probe and a thermocouple cut out probe should have been purchased along with the controller Typically the user pro vides the bath or system to be controlled and the heater Verify that the following components are present e 2100 Controller e Control Probe e Power Cord e Two Power Cords 1 for the Heater and 1 for the Stirrer e Thermocouple Connector e Manual Set Up Set up of the controller requires unpacking and placement of the controller connection of the heater connection of the stirrer if applicable installation of the control and cut out probes and connection of power Consult Section5 for detailed instructions for proper installation of the controller Heater Connect the heater to the back of the controller into the socket labeled HEATER Be sure the heater cable is adequate for the amount of current re quired and that the heater is wired correctly and safely Stirrer If applicable connect the stirring device to the back of the controller In the socket labeled STIRRER Be sure that the combined current of the HEATER and STIRRER does not exceed 10 amps 11 2100 Temperature Controller User s Guide 4 5 4 6 4 7 Probes Connect the control probe into the socket at the back of the controller labeled PROBE Insert the probe into the bath or system to be controlled Power Plug the controller power cord into a mains outlet of the pr
48. mple Thermistor Probe 49 RTD Probe Wififig ee s cece 4 h5 4 Fee ne tu qe ede deae amp x 56 Cut Out Probe Connections e 56 Controller to Heater Wiring leen 56 1 Before You Start Introduction 1 1 1 2 Before You Start Introduction The Hart model 2100 is a solid state temperature controller It is specifically designed to control the temperature of fluid baths but is well suited for many other applications as well The unique combination of analog and digital elec tronic circuitry provides exceptional accuracy and stability together with ease of operation and programmability Temperature sensing is done with a 4 wire 100 ohm platinum resistance probe thermistor probe optionally available which plugs into the back of the control ler To maintain a constant temperature the controller adjusts the pulses of power supplied to the heater by means of a solid state relay The maximum cur rent rating of the controller is 10 amps Any combination of heater or stirrer may be connected to the controller as long as the combined current does not ex ceed 10 amps The 2100 controller can be easily programmed via the four button front panel or by the optional serial interface Programming allows the user to set the con trol temperature units C or F the controller gain and the calibration vari ables The process or actual temperature is continuously displayed on a bright green LED p
49. nd the heater output is 100 At the top of the pro portional band the heater output is 0 Thus as the 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 value The temperature stability of the system depends on the width of the propor tional band See Figure 4 If the band is too wide the temperature will tend to deviate excessively from the set point due to varying external conditions This is because the power output changes very little with temperature and the con troller cannot respond very well to changing conditions or noise in the system If the proportional band is too narrow the temperature may swing back and 8 Controller Operation Proportional Band Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band xIX A A lt A lt AAIIIM _ _ sem a Figure 4 System temperature fluctuation at various proportional band settings forth because the controller overreacts to temperature variations For best con trol stability the proportional band must be set for the optimum width The optimum proportional band width depends on several factors including system heat transfer characteristics and heater probe positioning Thus the pro portional band width may require adjustment for best bath stability when any of these conditions change The proportional band width is easily adjusted from the
50. nt relative humidity 15 50 e pressure 75kPa 106kPa e mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized e altitude does not effect the performance or safety of the unit Warranty Fluke Corporation Hart Scientific Division Hart warrants the 2100 controller for a period of 1 year that takes effect 10 days after the product is shipped The manufacturer will provide parts and labor without charge for repair or replace ment of the instrument due to defects in material or workmanship The war ranty will not apply if the product has not been used according to the 2100 Temperature Controller User s Guide instruction manual or has been tampered with by the user For service or assis tance please contact an Authorized Service Center see Section 1 4 3 Safety Guidelines 3 Safety Guidelines e Operate the controller in room temperatures between 5 50 C 41 122 F The controller is not vented Therefore clearance for ventilation is not a requirement However do not place the controller on top of a calibration bath or dry well where it would be in direct heat Do not stack items on top of the controller e If the controller is used with a calibration bath be sure that the heater is plugged into the back panel in the correct socket The heater will heat continually if the heater and stirrer power are swapped See Figure 2 e If the controller is used to control a high tem
51. ntroller to improve the temperature set point accuracy Calibration is done by adjusting the controller probe calibration constants Ry and ALPHA or DO and DG for thermistor probes so that the process temperature as measured with a standard thermome ter agrees more closely with the set point The thermometer used must be able to measure the temperature with higher accuracy than the desired accuracy of the system RTD Probe Calibration Calibration Points In calibrating the bath Ry and ALPHA are adjusted to minimize the set point error at each of two different temperatures Any two reasonably separated tem peratures may be used for the calibration however best results will be obtained when using temperatures which are just within the most useful operating range of the system The further apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 50 C and 150 C are chosen as the calibration temperatures then the bath may achieve an accuracy of say 0 03 C over the range 40 to 160 C Choosing 80 C and 120 C may allow the bath to have a better accuracy of maybe 0 01 C over the range 75 to 125 C but outside that range the accuracy may be only 0 05 C Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration temperatures First set the tempera
52. nued Command Command Returned Acceptable Command Description Format Example Returned Example Values Available only with Thermistor configuration Read DO calibration parameter d0 d0 d0 99 999 d0 25 299 Set DO calibration parameter ton dc0 n d0 25 299 999 9 to 999 9 Read DG calibration parameter dg dg dg 999 99 dg 186 974 Set DG calibration parameterto n dg n dg 186 974 999 9 to 999 9 Operating Parameters Menu Read cut out mode cm ode cm cm xx cm AUTO Set cut out mode cm ode r eset a uto RESET or AUTO Set cut out to be reset manually cm ode r eset cm r Set cut out to be reset cm ode a uto cm a automatically Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting ton sa mple n sa 0 0 to 4000 seconds Set serial duplex mode du plex f ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to half du plex h alf du h Set serial linefeed mode If eed on of f ON or OFF Set serial linefeed mode to on If eed on If on Set serial linefeed mode to off Iffeed of f If of Calibration Menu Available with PRT configuration Read CO calibration parameter cO c0 c0 9 c0 0 Set CO calibration parameter ton cO n c0 0 999 9 to 999 9 Read CG calibration parameter cg cg cg 999 99 cg 406 25 Set CG calibration parameter ton
53. ocess temperature The digital LED display on the front panel allows direct viewing of the process temperature This temperature value is what is normally shown on the display The units C or F of the temperature value are displayed at the right For example Process 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 cut out has been triggered then the temperature display will alternately flash cut out Indicates cut out condition The message will continue to flash until the temperature is reduced and the cut out is reset The cut out has two modes automatic reset and manual reset The mode de termines how the cut out is reset which allows the bath to heat up again When in automatic mode the cut out will reset itself as soon as the temperature is lowered below the cut out set point With manual reset mode the cut out must be reset by the operator after the temperature falls below the set point When the cut out is active and the cut out mode is set to manual reset then the display will flash cut out until the user resets the cut out To access the reset cut out function press the SET button SET Access cut out reset function The display will indicate the reset function 23 2100 Temperature Controller User s Guide Display Temperature Secondary Func
54. oint 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 E at the left C 406 00 Set point 4 value in C If the set point value need not be changed then press EXIT to resume dis playing the bath temperature To adjust the set point value press UP or DOWN Increment display New set point value When the desired set point value is reached press SET to accept the new value and access the set point vernier If EXIT is pressed instead then any changes made to the set point will be ignored Accept new set point value Set point Vernier The set point value can be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a more precise temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed from the set point by pressing SET The vernier setting is displayed as a 6 digit num ber with five digits after the decimal point This is a temperature offset in de grees of the selected units C or F 0 00000 mn 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 adju
55. ons 0 R e LT ta ALPHA 1 RO ty t 1 ALPHA t err 1 ALPHA t erry ty t ALPHA 1 ALPHA If for example Ry and ALPHA were previously set for 100 000 and 0 0038500 respectively and the data for t ty err and erry were as given above then the new values Ry and ALPHA would be computed as 100 193 and 0 0038272 re spectively Program the new values Ry and ALPHA into the controller Check the calibration by setting the temperature to tj and ty and measuring the errors again If desired the calibration procedure may be repeated again to further im prove the accuracy Calibration Example The controller is to be used between 75 and 125 C and it is desired to calibrate the system as accurately as possible for operation within this range The current values for RO and ALPHA are 100 000 and 0 0038500 respectively The cali bration points are chosen to be 80 00 and 120 00 C The measured tempera tures are 79 843 and 119 914 C respectively Refer to Figure 6 for applying equations to the example data and computing the new probe constants Thermistor Probe Calibration Calibration Points In calibrating the bath DO and DG are adjusted to minimize the set point error at each of two different temperatures Any two reasonably separated tempera tures may be used for the calibration however best results will be obtained when using temperatures which are just within the most useful operating range of the
56. ooling can also cause instability In solid systems stability is typically much poorer than in fluid systems because of the much slower system response time The response time can be optimized by placing the control probe as close as possible to the heater 55 2100 Temperature Controller User s Guide 12 1 10 The heater heats continuously and the stirrer motor stirs sporadically or not at all Check to see that the heater and stirrer motor are plugged into the correct sock ets on the back of the unit If not plug them in correctly If they are plugged in correctly call an Authorized Service Center 12 2 Wiring Diagrams Rear Panel Probe Connector Rear Panel ha Thermocouple Connector K Thermocouple If cutout is not used RTD Sensor Wire Jumper Figure 8 RTD Probe Wiring Figure 9 Cut Out Probe Connections CONTROLLED SYSTEM CONTROLLER HEATER SOCKET Hor HEATER 10 A MAX NEUTRAL GROUND Figure 10 Controller to Heater Wiring 56 13 Appendix Hardware Configuration Switching Probe Types 13 13 1 13 2 Appendix Hardware Configuration Switching Probe Types The 2100 controller is normally set up to use a 100 ohm platinum RTD probe The RTD probe is able to operate over a very wide temperature range If opera tion over a wide range is not necessary and better resolution and stability than 1s possible with the RTD probe is desired then operation using a thermistor
57. oper voltage fre quency and current capability This will be 115 230 VAC 410 50 60 Hz Check to see that the indicator window of the power module matches the volt age of the mains supply Turn the controller on using the rear panel POWER switch The controller will turn on and begin to heat or cool the system to reach the previously pro grammed temperature set point The front panel LED display will indicate the actual process temperature See Section1 3 3 or Section5 6 for informatin on selecting the correct fuse for the application Setting the Temperature In the following discussion and throughout this manual a solid box around the word SET UP DOWN or EXTT indicates the panel button to press while the dotted box indicates the display reading on the front panel Explanation of the button function or display reading is written at the right To view or set the temperature set point proceed as follows The front panel LED display normally shows the actual process temperature 24 68 Process temperature display usressadsapactacasansciieaceaesans When SET is pressed the display will show the set point memory that is cur rently being used and its value Eight set point memories are available SET Access set point selection i 25 0 Set point 1 25 0 C currently used Press SET to select this memory and access the set point value SET Access set point value C 25 08 Current value of set point 1 25
58. ped with operator accessible fuses If a fuse blows 1t may be due to a power surge or failure of a component Replace the fuse once If the fuse blows a second time it is likely caused by failure of a component part Disconnect the bath and or stirrer motor Check to see 1f the fuse s blow Connect the heater and stirrer motor one at a time Check each time to see if the fuse s blow If the fuse s blow only when the stirrer motor and or heater are connect the fault may be in the bath If not contact Hart Scientific Customer Service Always replace the fuse with one of the same rating voltage and type Never replace the fuse with one of a higher current rating DO NOT EXCEED 10 AMPS If a mains supply power fluctuation occurs immediately turn off the con troller Power bumps from brown outs and black outs can damage the compressor Wait until the power has stabilized before re energizing the controller 4 Quick Start Unpacking 4 1 4 2 4 3 4 4 Quick Start This chapter gives a brief summary of the steps required to set up and operate the 2100 temperature controller This should be used as a general overview and reference and not as a substitute for the remainder of the manual Please read Sections5 through7 carefully before operating the controller Unpacking Unpack the controller carefully and inspect it for any damage that may have oc curred during shipment If there is shipping damage notify the carrier immediate
59. perature bath where fluid va porization is significant a fume hood should be used e The controller is a precision instrument Although it has been designed for optimum durability and trouble free operation it must be handled with care The instrument should not be operated in excessively dusty or dirty environments or be placed in a positions where hot or cold liquids are splashed on it e The controller can be used to control instruments which generate extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from a calibration bath Cautiously handle probes to prevent personal in jury Carefully place probes on a heat cold resistant surface or rack until they are at room temperature e Use only a grounded AC mains supply of the appropriate voltage to power the controller The controller can use a maximum of 10 amps at 115 230 VAC 10 50 60 Hz e If the controller is used to control a calibration bath or dry well Hart rec ommends a dry out period once the controller is attached to the system The system needs to be energized for a dry out period of 1 2 hours be fore it can be assumed to meet all of the safety requirements of the IEC 1010 1 e The controller is shipped from the factory with two fast acting fuses 10 amp 250 V size 1 4 x 1 for 115 V 5 x 20 mm for 230 V This current rating is the maximum for the unit NEVER use a he
60. ry The memory may be reset by holding the SET and EXIT keys down while power to the controller is switched on The display will show init indicating the memory is being initialize At this point each of the controller parameters and calibration constants must be reprogrammed into memory If the problem is solved but reoccurs the battery should be replaced If the problem is not fixed there may be a failed electronic component In ei ther case contact an Authorized Service Center The displayed process temperature is in error and the controller remains in the cooling or heating state at any set point value A typical cause of this problem is the control probe The probe may be discon nected wired incorrectly or incompatible with the controller Check that the probe is connected and wired properly Verify that the probe is of the correct type for which the controller was configured to use The controller configura tion may be checked by watching the controller display as the power is switched on The display briefly flashes E P I PE LO or PE HI Flash ing E P i indicates the controller is configured to use a thermistor probe Pt LO and PE HP indicate the controller is configured to use a DIN 43760 RTD probe with the range of 100 to 200 and 100 to 600 C respectively If the probe is not correct use the correct probe Both types of probes are available from Hart Scientific If the con
61. s many instruments to be connected and controlled simultaneously To eliminate noise the GPIB cable should be shielded Setup and Address Selection To use the IEEE 488 interface first connect an IEEE 488 standard cable to the back of the bath 39 2100 Temperature Controller User s Guide 40 9 2 2 9 3 Next set the device address This parameter is programmed within the IEEE 488 interface menu To enter the IEEE 488 parameter programming menu first press EXIT while pressing SET and release to enter the second ary menu Press SET repeatedly until the display reaches P Ob E This is the menu selection Press UP repeatedly until the IEEE 488 interface menu is indicated with IEEE Press SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter The IEEE 488 address is prompted with Addr E55 Press SET to program the address The default address is 22 Change the device address of the bath if necessary to match the address used by the communication equipment by pressing UP or DOWN and then SET IEEE 488 Operation Commands may now be sent via the IEEE 488 interface to read or set the tem perature or access other controller functions All commands are ASCII charac ter strings and are terminated with a carriage return CR ASCII 13 Interface commands are listed below Interface Commands The various commands for acces
62. s or attempts to control at an inaccurate temperature 55 12 1 7 The controller shows that the output power is steady but the process temperature is unstable55 12 1 8 The controller alternately heats for a while then cools 55 12 1 9 The controller erratically heats then cools control is unstable 55 12 1 10 The heater heats continuously and the stirrer motor stirs sporadically or not at all 56 12 2 Wiring Diagrams e 56 13 Appendix Hardware Configuration 57 13 1 Switching Probe Types 57 13 2 Gaim Range s soe e we wa Gwe Race ed A 57 iii Figures and Tables Table 1 Table 2 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Table 3 Table 3 Table 3 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 International Electrical Symbols sns 1 Speciications s 26x expe UR RUP aE p a a RE RO Se 7 Front panel features s e p s oein o sogar s yon Re m RR Re 17 Back panel features llle 18 Controller Operation Flowchart o o 24 System temperature fluctuation at various proportional band settings 29 Serial Interface Cable Wiring o o 38 2100 Controller Communications CommandS 41 2100 Controller Communications Commands continued 42 2100 Controller Communications Commands continued 43 Calibration Example Platinum RTD Probe 47 Calibration Exa
63. sample rate to the displayed value 5A 60 j New sample period ed 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 controller via the serial interface will be immediately echoed or transmitted back to the device of origin With half duplex the commands will be executed but not ech oed The duplex mode parameter is indicated by A SERES EYEA SER AER EE aa O OO 8 Controller Operation IEEE 488 Parameters 8 13 4 8 14 8 14 1 Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables on or disables off transmission of a linefeed character LF ASCII 10 after transmission of any carriage return The linefeed parameter is indicated by MG sbensuceadasesaustusctscaceuaseues TN Siastaususeddsagandsaunersesueansenes IEEE 488 Parameters Controllers may optionally be fitted with an IEEE 488 GPIB interface In this case the user may set the interface address within the IEEE 488 parameter menu This menu does not appear on instruments not fitted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Masieuewpesdastsasssucctecssennseues Press SET to enter the menu IEEE 488 Address The IEEE 488 interface must be configured to use the same address as the ex ternal communicating device The address is indicated by p Ad
64. sing the controller functions via the digital in terfaces are listed in this section see Table 3 These commands are used with both the RS 232 serial interface and the IEEE 488 GPIB interface In either case the commands are terminated with a carriage return character The inter face makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters which determines a unique command A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example s lt CR gt will return the current set point and s 50 00 lt CR gt will set the set point set point 1 to 50 00 degrees In the following list of commands characters or data within brackets and are optional for the command A slash denotes alternate characters or data Numeric data denoted by n may be entered in decimal or exponential notation Characters are shown in lower case although upper case may be used Spaces may be added within command strings and will simply be ignored Backspace BS ASCII 8 may be used to erase the previous character A termi nating CR is implied with all commands 9 Digital Communication Interface Interface Commands Table 3 2100 Controller Communications Commands
65. stable temperature 21 2100 Temperature Controller User s Guide 22 7 4 Temperature Controller The system temperature is controlled by Hart Scientific s unique hybrid digi tal analog temperature controller The controller offers the tight control stability of an analog temperature controller as well as the flexibility and programmabil ity of a digital controller The temperature is monitored with a platinum resistance sensor in the control probe or alternately a linearized thermistor probe The signal is electronically compared with the programmable reference signal amplified and then passed to a pulse width modulator circuit which controls the amount of power applied to the bath heater For protection against solid state relay failure or other circuit failure the con troller will automatically turn off the heater with a second mechanical relay anytime the process temperature is more than a certain amount above the set point temperature As a second protection device the controller is also equipped with a separate thermocouple temperature monitoring circuit which will shut off the heater if the temperature exceeds the cut out set point The controller allows the operator to set the set point temperature with high resolution set the cut out adjust the proportional band monitor the heater out put power and program the controller configuration and calibration parameters The controller may be operated in temperature uni
66. sted SET need not be pressed This allows one to continually adjust the system temperature with the vernier as it is displayed Increment display 0 00090 i New vernier setting cl 8 Controller Operation Temperature Scale Units 8 4 Next press EXIT to return to the temperature display or SET to access the temperature scale units selection SET Access scale units Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius C or Fahrenheit F The units will be used in displaying the process temperature set point vernier proportional band and cut out set point The temperature scale units selection is accessed after the vernier adjustment function by pressing SET From the temperature display function access the units selection by pressing SET 4 times Scale units currently selected Press UP or DOWN to change the units Change units Unz F New units selected Press SET to accept the new selection and resume displaying the bath temperature Set the new units and resume temperature display 27 2100 Temperature Controller User s Guide 28 8 5 8 6 8 7 Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simulta neously and then releasing The first function in the secondary menu
67. tions I 1 1 Cutout Active SET pce eel ee i Een a EXIT HA Select Setpoint SET Y EXIT Adjust Setpoint I SET Y EXIT Adjust Vernier I SET y EXIT Set Scale C F SET gt SET EXIT v EXIT Display Power I SET Y EXIT Set Proportional Band I SET Y Set Cutout EXIT EXIT Temp I SET Configuration Menu SET EXIT gt Operating DOWN Parameters Menu SET Y Cutout Reset Mode SET Adj RO I SET EXIT ALPHA SET EXIT gt Adj ALPHA SET EXIT EXIT gt Adj Cutout Reset Mode SET EXIT u gt DOWN EXIT gt Thermistor Probe Menu Figure 3 Controller Operation Flowchart 24 EXIT
68. ts of degrees Celsius or Fahr enheit The controller is operated and programmed from the front control panel using the four key switches and digital LED display The controller equipped with an RS 232 serial or may also be optionally equipped with an IEEE 488 GPIB digital interface for remote operation Operation of the controller using the front control panel is discussed following in Section8 Operation using the digital interface is discussed in Section9 When the controller is set to a new set point the system will heat or cool to the new temperature Once the new temperature is reached it 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 or more depending on the system and pro portional band 8 Controller Operation Process temperature 8 1 8 2 Controller Operation This chapter discusses in detail how to operate the temperature controller using the front control panel Using the front panel key switches and LED display the user may monitor the process temperature set the temperature set point in de grees C or F monitor the heater output power adjust the controller proportional band set the cut out set point and program the probe calibration parameters operating parameters serial and IEEE 488 interface configuration and control ler calibration parameters Operation of the functions are shown in the flowchart summarized in Figure 3 Pr
69. ture to the lower set point which we will call tj Wait for the system to reach the set point and allow 15 minutes to stabilize at that temperature Check the stabil ity with the thermometer When both the system and the thermometer have sta bilized measure the system temperature with the thermometer and compute the temperature error err which is the actual temperature minus the set point tem perature If for example the temperature is set for a lower set point of tj 50 C and the bath reaches a measured temperature of 49 7 C then the error is 0 3 C Next set the temperature for the upper set point t and after stabilizing mea sure the temperature and compute the error erry For our example we will sup pose the temperature was set for 150 C and the thermometer measured 150 1 C giving an error of 0 1 C Computing R and ALPHA Before computing the new values for R and ALPHA the current values must be known The values may be found by either accessing the probe calibration menu from the controller panel or by inquiring through the digital interface 45 2100 Temperature Controller User s Guide 46 10 2 10 3 10 3 1 The user should keep a record of these values in case they may need to be re stored in the future The new values Ry and ALPHA are computed by entering the old values for Ry and ALPHA the calibration temperature set points tj and ty and the temperature errors err and erry into the following equati
70. y with the thermometer When both the system and the thermometer have sta bilized measure the system temperature with the thermometer and compute the temperature error err which is the actual temperature minus the set point tem perature If for example the controller is set for a lower set point of t 20 C and the system reaches a measured temperature of 19 7 C then the error is 0 3 C Next set the controller for the upper set point ty and after stabilizing measure the temperature and compute the error erry For our example we will suppose the temperature was set for 80 C and the thermometer measured 80 1 C giving an error of 0 1 C 47 2100 Temperature Controller User s Guide 48 10 3 3 10 3 4 Computing DO and DG Before computing the new values for DO and DG the current values must be known The values may be found by either accessing the probe calibration menu from the controller panel or by inquiring through the digital interface The user should keep a record of these values in case they may need to be re stored in the future The new values DO and DG are computed by entering the old values for DO and DG the calibration temperature set points tj and ty and the temperature errors errL and errH into the following equations _ erty t DO err t DO D DO O t ty err erty DG ipa t ty If for example DO and DG were previously set for 25 229 and 186 9740 re

Access set-point value

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