Hart Scientific 9112 Calibration Furnace Manual
Contents
1. 0 3 Uniformity Stabilization Typically 2 house midrange Time slower at low temperature end 4 hours faster at high temperature end Heater Power 3700 Watts High 925 Watts Low Power 230 VAC 10 50 60 Hz 20 A Requirements Outside 18 H x 14 25 W x 26 D 457mm x Dimensions 362mm x 660mm Weight 72 5 lbs 2 2 Environmental Conditions Although the instrument has been designed for opti mum durability and trouble free operation it must be Model 9112 handled with care The instrument should not be oper ated in an excessively dusty or dirty environment Maintenance and cleaning recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions e temperature range 5 50 41 122 e ambient relative humidity 15 50 e pressure 75 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 2 3 Warranty The 9112 Metrology furnace is covered by a 1 year warranty that takes effect 10 days after the product is shipped The manufacturer will provide parts and labor without charge for repair or replacement of the instru ment due to defects in material or workmanship The warranty will not apply if the product has not been used according to the instruction manual or has been tam pe2. Installation 1 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 4 4 Power The furnace utilizes a ground AC supply of 230 VAC 10 20 amps single phase 50 60 HZ An eight foot 14 AWG 2 conductor with ground power cord is provided 4 5 Equilibration Block Assembly Installation After the furnace has been installed and permanently located the equilibration block assembly may be in serted Carefully insert the block assembly into the tube with its insulation packing per Figure 1 on page 16 Extreme care should be taken installing the Equili bration Block since it is very heavy and the quartz tube is very fragile A 1 8 to 1 4 inch air gap between the front access plate and the front panel of the furnace is required in order to prevent the front panel from getting too hot Care must be taken to prevent dirt insulation or anything else from getting between the block and the quartz tube or it might break during heat up due to thermal expansion differences The fit between the block and the tube is typically loose in order to accom modate this expansion WARNING If the furnace must be moved for any reason re move the block assembly to prevent breakage of the quartz tube 4 6 Probe Installation Install the temperature control and over temperature cut out probes from the back as shown in Figure 1 on page 16 and Figure 3 on page 18 Insert the probes carefully to the depth shown i
3. 13 4 6 Probe 13 Parts and Control 15 5 1 View ps Pale 15 5 1 1 Temperature Controller 15 5 1 2 Over Temperature 15 5 1 3 Power and Heater 15 5 2 15 5 2 1 Equilibration Block Assembly 15 5 2 2 Temperature Control and Cut out 16 5 3 Back View a 16 Did 1 The Power Cable 17 5 3 2 Nomenclature 2 2 2 2 das 17 53 9 FUSOS ie e bb 5 40 17 5 5 2 sie 19 61 AT 19 6 2 Operating the Furnace 19 Digital Communication Interface 21 Maintenance 23 Wiring Diagram 25 10 Appendix Fairfax Material Safety Data Sheet vi 1 Introduction The Model 9112 Calibration Furnace was designed specifically for calibrating fiber optic sensors and thermocouples at higher temperature ranges up to 1100 C The furnace utilizes an equilibration block capable of making comparison measurements on mul tiple probes The standard equilib
4. installed in the cabinet which shuts down the furnace heaters if the cabinet exceeds a safe temperature 6 2 Operating the Furnace Operating the Model 9112 is straight forward once you have grasped all the important principles Temperature selection is accomplished by using the up and down arrow keys on the front of the tempera ture controller The lower display indicates the new temperature setting while the upper display shows the actual temperature When scanning from one tem perature to another notice that the temperature con troller seems to be ahead of the equilibration block temperature This difference is because the tempera ture control sensor is near the outside of the block and it takes some time for the heat to conduct into the cen ter Depend on an external temperature monitor to es tablish when the equilibration block has reached the desired temperature and achieved stability The actual temperature indication made by the tem perature controller is not intended to be a calibration Model 9112 Operation reference but to merely provide a general indication of the furnace temperature NIST traceable standard thermometers are available and should be used in making comparison measurements For less stringent measurements you may make a calibration of the con troller and control probe at particular temperature points and use that with reasonable accuracy for a time Use the heater power switch in HIGH heat positi
5. the applicable MSDS Material Safety Data Sheets WARNING HIGH TEMPERATURES PRESENT in this equipment FIRES AND SEVERE BURNS may result if personnel fail to observe safety precautions WARNING To ensure the safety of personnel and to avoid damage to equipment DO NOT use this unit for any application other than calibration work DO NOT use this unit in environments other than those listed in the user s manual Continuous use of this equipment at high temperatures for extended periods of time requires caution Completely unattended high temperature operation is not recommended for safety reasons Components and heater lifetimes can be shortened by continuous high temperature operation Follow all safety guidelines listed in the user s manual WARNING CALIBRATION EQUIPMENT SHOULD ONLY BE USED BY TRAINED PERSONNEL N Table of Contents Introduction anzi 7 Specifications and Environmental Conditions 9 2 1 Specifications oaoa rr rr rr rr rr rr ss ss 9 2 2 Environmental 5 9 23 MONO ARS ss sas A 9 Safety Guidelines 11 Installation Rs da 13 41 Unpacking amp Inspection 13 42 22255225225 se 13 4 3 Dry OUt Period 13 44 13 45 Equilibration Block Assembly Installation
6. voltage to power the instrument The furnace requires 20 amps at 230 VAC 10 50 60 Hz Manual Rev 770601 Safety Guidelines Before initial use after transport and anytime the furnace has not been energized for more than 10 days the instrument needs to be ener gized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety re quirements of the IEC 1010 1 The instrument is not equipped with easily ac cessible fuses The fuses are located inside the control drawer We do not recommend re placing the fuses without calling Hart Scientific Customer Service first If a mains supply power fluctuation occurs im mediately turn off the furnace Power bumps from brown outs and black outs can damage the instrument Wait until the power has stabi lized before re energizing the furnace The unit is not considered portable Once in Stallation is complete the unit should not be moved unnecessarily If the unit must be moved wait until the unit is cooled to less than 100 C It is advisable that two people lift the unit carefully by placing their hands under neath the control drawer Lift simultaneously being careful not to tip the unit Be sure that the block is removed before moving the unit The quartz glass liner is extremely fragile 11 Safety Guidelines 12 Manual Rev 770601 Model 9112 4 Installation 4 1 Unpacking amp Inspection The furnace has been carefully packed for saf
7. 062 O SERIAL NO MADE IN USA CUTOUT CONTROL 230 VAC POWER Figure 3 Back View 18 Manual Rev 770601 Model 9112 6 Operation 6 1 Overview The Model 9112 is basically a temperature controlled furnace utilizing a full PID micro processor based tem perature controller with a Type K thermocouple tem perature sensor The temperature controller sends a time proportional signal to the solid state relay which regulates the current to the heater The heater power can be switched to HIGH or LOW power positions The object of the temperature control is the equilibration block with test wells containing the reference probe and the sensors to be calibrated inside The block pro vides a thermal mass which tends to stabilize the tem perature and reduce the gradients between the test wells The user settable over temperature cut out can open the heater circuit with a relay if the safe tem perature for the test probe or for the furnace 15 ex ceeded The enclosure is designed to limit the heat seen by the various components of the furnace as well as the user The control section is in a separate cabinet below the furnace heat preventing damage or accu racy errors The furnace part of the cabinet contains ventilation holes as well as two fans controlled by the thermostat This cooling capability prevents the sur face of the enclosure from getting dangerously hot In the event that the fans should fail a second thermostat is
8. 9112 CALIBRATION FURNACE USER MANUAL SCIENTIFIC Rev 770601 CoPYRIGHT 1997 ALL RIGHTS RESERVED HART SCIENTIFIC 799 E UTAH VALLEY DRIVE AMERICAN FORK UTAH 84003 9775 TELEPHONE 801 763 1600 Fax 801 763 1010 INTERNET HTTP WWW HARTSCIENTIFIC COM WARNING To ensure the safety of operating personnel and to avoid damage to this equipment DO NOT operate this unit without a properly grounded properly polarized power cord DO NOT connect this unit to a non grounded non polarized outlet DO USE a ground fault interrupt device WARNING HIGH VOLTAGE is used in the operation of this equipment SEVERE INJURY OR DEATH may result if personnel fail to observe safety precautions Before working inside the equipment turn power off and disconnect power cord WARNING This unit contains ceramic fiber or other refractories which can result in the following May be irritating to skin eyes and respiratory tract be harmful if inhaled May contain or form cristobalite crystalline silica with use at high temperatures above 1600 F which can cause severe respiratory disease Possible cancer hazard based on tests with laboratory animals Animal studies to date are inconclusive No human exposure studies with this product have been reported Service personnel coming into contact with these materials should take proper precautions when handling them Before maintaining this equipment read
9. INHIHL aivis YITTOMLNO9I OFF z vb FINIVEFNIL YILVIH LNOLNI 9 lo OINLHM ATE OINLHM hol o 9 132 YOLVOICNI ba 170110 2 EES dWAL AUD proteins 10d 1 ide cec Su Y 289 gt Him 22 LNOLNI DUO 9 CIY LHM gt HIS TAA LHM 1 Su 119 0389 1HM L_ p NO14318L M18 LHM o o NYO O3Y LHM TIANNYD 2102 546010 io HOLIMS diN3L oi 118 079 LHM NO nig la SN 8 M18 N18 LHM E oa 7 AVI13Y IHM ae ma ma 431113 TANNYD 062 ma NUS RSS Nya O i 89504 WALSAS NO1441 84 119 079 LHM 9 Wiring Diagram Figure 5 Wiring Diagram Model 9112 Wiring Diagram 26 Manual Rev 770601 Model 9112 Appendix Fairfax Material Safety Data Sheet 10 Appendix A Fairfax Material Safety Data Sheet Model 9112 Manual Rev 770601 27
10. ay driven by the temperature controller fails shorts causing thermal runaway 5 1 3 Power and Heater Switches The power switch is located just left of the temperature controller The top is pressed inward to turn the unit on Note The internal fans are wired ahead of the switch so that they stay on until the unit is cooled even though the main power may have been turned off This way the outer surfaces of the enclosure are not heated to dan gerous levels from stored heat The heater switch provides two levels of power to the heaters The LOW position switches the two furnace heaters into a series circuit while the HIGH position connects them in parallel The low heat generally pro vides the highest stability while the HIGH position re duces the time spanning from a lower to a higher temperature 5 2 Heater Assembly The heater is made of a fiber ceramic insulating mate rial with heating elements imbedded The heater is made in two halves each with a separate heating ele ment The heating elements are wired to the heating power switch so as to switch between series and paral lel circuits allowing HIGH and LOW heating positions The heater is primarily a radiating device and is rated for a maximum furnace operating temperature of 1100 C Realize however that the higher the operat ing temperature the lower the lifetime of the heater Limiting the number of hours at the extreme high end of the temperature range to only the tim
11. d down Temperature Adjustment arrow keys are the only temperature controllable controls nor mally used A quick single stroke increments or decre ments the temperature setting Holding the buttons down causes a gradual acceleration of the tempera ture setting These same buttons are used to adjust other parameters in conjunction with the PAR button Further information about the controller operation can be obtained from the temperature controller installa tion and operation manual 5 1 2 Over Temperature Cut out The over temperature cut out is located on the left side of the control panel The controls include a tempera ture limit adjustment control knob calibrated in Celsius and a temperature limited indicator light The cut out is adjustable by the user within the temperature range of the furnace with divisions shown every 25 C The in dicator light turns on when the set limit is reached and automatically resets when the temperature has dropped about 20 degrees The cut out is provided to allow the user to set the maximum furnace temperature to a point within the safe range of sensor s being calibrated and to protect the furnace from exceeding its own safe operating range Limiting the top end also helps extend the life of the heaters Model 9112 Parts and Control The cut out controls a relay which is wired in series with the heater circuit The cut out is provided as a safety backup in case the solid state rel
12. d suggested cable wiring To eliminate noise the serial cable should be shielded with low resistance between the connector DB 9 and the shield Connect the appropriate connectors to your computer and to the furnace To communicate with the furnace e Load GWBASIC e Load and then run the program TC847 BAS e Set the Baud Rate on the Controller of the 9112 to 9600 e Set the address of your furnace to 10 or greater e Set the temperature or if needed the furnace parameters A listing of the parameters and their meaning are in the following table Table 2 Command Parameters process value temperature SL set point OP output power XP proportional band TI integration time TD derivative time To set a parameter simply type in the parameter and the value For example to set the control temperature to 800 C type SL 800 RS 232 Cable Wiring for IBM PC and Compatibles 9112 Computer DTE Connector Connector DB 9 Pin DB 25 Pin 1NC e 2 RxD 2 TxD 3 TxD 3 RxD 4NC e e 4RTS 5 GND 5CTS 6 NC 20002 00 6 7RTS 8CTS e 8 9 e 20 Figure 4 Serial Cable Wiring Model 9112 9112 Computer DTE Connector Connector DB 9 Pin DB 9 Pin INC e 1 NC 2 bt a 3 TxD 3 TxD 4NC e 4 NC 5 GND 5 GND 6 NC 6 NC 7 RTS e 7 RTS 8 CTS e 3 CTS 9 NC e 9 NC Manual Rev 770601 21 Digital Communication Interface 22 Manual Rev 770601 Model 9112 8 Maint
13. e required for calibrations increases the longevity of your furnace heating element Likewise using the LOW heat posi tion reduces the watt density of the heater and in creases lifetime 5 21 Equilibration Block Assembly The equilibration block assembly consists of 1 the test well 2 access tubes and endplate 3 the front and rear guard blocks 4 insulation on each end and 5 the Manual Rev 770601 15 Parts and Control Quartz Tube Isothermal Block Cutout Probe LU nt Control Probe Guide Tubes Sectional Side View Figure 1 Side View center block The c
14. e ship ment by traditional means Unpacking should be done carefully Check carefully for all parts If any damage has occurred you should notify the shipper immedi ately and make the appropriate claim The equilibration block assembly has been packed separately in order to protect the quartz tube from breakage during shipment The block assembly should not be installed into the furnace until it has been placed in its final location Verify that the following components are present e Furnace e 2 Thermocouples Equilibration Block Assembly 2 pieces e Diskette e Manual 4 2 Location The furnace is intended to be installed into any typical calibration facility environment The best results from the furnace are realized if the temperature fluctuations in the room are not excessive A minimum of 6 inches free air space around the furnace must be allowed This air space allows air exchange to occur and safely remove excess heat from the furnace WARNING This furnace is intended for high temperature use and consequently a fire danger exists Keep away from flammable materials and keep fire ex tinguishing equipment near by Extremely humid environments may require startup on low heat after long periods of disuse 4 3 Dry out Period Before initial use after transport and any time the in strument has not been energized for more than 7 days the unit needs to be energized for a dry out period of Model 9112
15. enance The calibration instrument has been designed with the utmost care Ease of operation and simplicity of main tenance have been a central theme in the product de velopment Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in an oily wet dirty or dusty environ ment e the outside of the instrument becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemi cals on the surface which may damage the paint e Be sure that the well of the furnace is kept clean and clear of any foreign matter Do not use fluids to clean out the well e fa hazardous material is spilt on or inside the equipment the user Is responsible for taking the appropriate decontamination steps as out Model 9112 Manual Rev 770601 23 Maintenance lined by the national safety council with re spect to the material If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the instrument If there are any questions call Hart Scientific Customer Service for more information Before using any cleaning or decontamination method except those recommended by Hart users should check with Hart Scientific Cus tomer Service to be sure that the proposed method will not damage the equipment If the instrument is used in a manner not in ac cordance with the equipment design the op eration of
16. enter block is intended to stabilize the temperature fluctuations and to conduct heat be tween the test wells in order to equalize them The guard blocks shunt heat to the various probes to reduce heat loss out the ends The whole assembly is sup ported by a quartz tube All heated materials are quartz ceramic fiber or INCONEL alloy 600 5 2 2 Temperature Control and Cut out Sensor The temperature control sensor is a Type K Thermo couple as indicated This sensor is grounded to the IN CONEL sheath which is 3 16 inch in diameter and 16 inches long Its location in the block is important and can cause the gradient in the block to move back and forth as the probe is moved back and forth The probe is normally inserted as shown in Figure 1 The cut out sensor is the same as the control sensor except in length 12 inches instead of 16 inches long This sensor is inserted through a fitting into the space between the heating element and the quartz tube Its location here helps prevent the heater elements from overheating thus prolonging their life The sensor connectors are provided on the rear panel of the furnace for connecting the control and cut out thermocouples sensors They are Type K miniature connectors and allow for ease of system assembly and sensor replacement 5 3 Back View See Figure 3 on page 18 16 Manual Rev 770601 Model 9112 Heater Power Over temperature Cut out Indicator Parts and Contro
17. ing cells can range from 0 2 C to well un der 0 1 C For calibrations that must be less than full insertion into the test well make your own compari Manual Rev 770601 19 Operation sons between the reference and test cell at that depth to establish the uncertainties The furnace can be used throughout the temperature range of 300 to 1100 C Lower temperatures are slug gish however High integrating values are required to maintain controller stability 1200 sec at the lower tem peratures Around 100 C the control and cut out probes need to be reserved This allows response for the sen sor since the cut out probe is near the heater Be sure to put them back for higher temperatures Expect some offset from the indicated temperature and the actual temperature Stability and gradients between test wells are similar at higher temperatures but time to sta bility is much longer 20 Manual Rev 770601 Model 9112 Digital Communication Interface 7 Digital Communication Interface To control the furnace through a computer connected to the furnace over a serial cable follow the instruc tions listed below The program supplied is a demo program and may be altered by you for your specific needs First make the appropriate cable assembly for your computer system The serial communications cable attaches to the calibrator through the DB 9 connector at the back of the instrument Figure 4 shows the pin out of this connector an
18. l Test Wells Power Switch Cut out Control ESSA CALIBRATION FURNACE Temperature Controller SY TEMPERATURE LIMIT C HEATER TEMPERATURE LIMITED O 2 00 0 2 Figure 2 Front View 5 3 1 The Power Cable The furnaceis provided with a 14 gauge two conductor with ground power cable The user must provide a con nector to meet the needs of the installation Be sure to follow electrical codes and ground the green conduc tor appropriately The hot wires are white and black 5 3 2 Nomenclature The nomenclature on the rear panelofthe furnace pro vides important information to the user in case service Model 9112 is required nomenclature includes the manufac turer manufacturer location model number and serial number specific to this unit Refer to the model and se rial numbers whenever service is required 5 3 3 Fuses Two 20 amp fuses are used to protect the system one for each leg of the 230 VAC power The fuses are lo cated inside the control cabinet If the furnace fails to operate check these first A 1 amp fuse is located inside the control cabinet for the controller Manual Rev 770601 17 Parts and Control Cooling Fans Control Probe Cut out Probe THERMOCOUPLE PROBES CUTOUT Nomenclature CONTROL OOOO A 20 AMP FUSES HART SCIENTIFI PLEASANT GROVE UTAH 84
19. n order to insure that the sensor is properly located in the equilibration block The control probe should be inserted through the guard cover first so that the cover can be properly in stalled afterward Position the rear guard block as shown and then insert the insulation ceramic fiber see MSDS in the Appendix being careful not to bend the probe sheath The insulation should generally Manual Rev 770601 13 Installation block air movement in and out of the back of the quartz tube Install the Guard Cover to prevent physical contact with parts that become dangerously hot when in use Be sure to connect the probes properly on the rear panel 14 Manual Rev 770601 Model 9112 5 Parts and Control 5 1 Front View See Figure 2 on page 17 5 1 1 Temperature Controller The temperature controller is a full PID micro processor based instrument as indicated The control ler 15 set to cover the range of 0 to 1100 C and features two LED type displays The upper display normally in dicates the actual temperature while the lower display indicates the set temperature The displays are also utilized in setup and alarm functions Other indicators include the OP1 and OP2 indicator lights The in dicator lights when the heater is on The OP2 is not functional in this unit The R indicator lights during programmed ramping The M indicator flashes if the sensor fails If the sensor opens the heaters shuts off The up an
20. on for rapid scanning between temperatures and switch to LOW for controlling when possible to 900 C WARNING Take care that all sensors used as references or being calibrated in the furnace are capable of withstanding the desired temperature range to be used WARNING Take extreme care in handling hot probes The extreme temperatures generated in a furnace of this type can cause serious personal injury Do not touch them on external surfaces of the fur nace or set them on any other surfaces unable to withstand those temperatures A fire hazard exists Do not touch the access tube end plate or severe burns can result Some kind of metal and or ceramic fiber surface or container should be used to set the hot probes on to prevent injury damage and fire For best results all reference or sample probes should be inserted into the full depth of the well At this posi tion the stability is the highest and the gradient the low est Each user should satisfy themselves as to what the uncertainties are in terms of stability and gradients between the test wells Variations in equipment probe size configuration etc affect these important factors A solid unstirred mass such as in a furnace is subject to heat losses from the probe stem which varies from probe to probe and temperature to temperature Typi cally stabilities are less than 0 1 C and can be as lit tle as 0 015 C at 500 C Similarly gradients between the measur
21. ration block is sized for 1 4 inch probes however custom options are pos sible Temperature stability is better than 0 1 C throughout the range and the gradient between wells at full insertion is less than 0 5 C 0 25 C The temperature control system utilizes a digital con troller with a Type K thermocouple control sensor Model 9112 Introduction An RS 232 interface is optional The controller dis plays the set temperature and the actual temperature simultaneously The display shows temperature to the nearest degree in C or F normally shipped in C may be changed to F The temperature is set with conven ient up and down buttons on the front panel Sensors being calibrated as well as the furnace itself are protected from excessive temperature with an over temperature cut out The cut out is easily ad justed from the front panel This device is relay oper ated and protects against the possibility of thermal runaway due to a shorted solid state relay which con trols the heaters Manual Rev 770601 Introduction 8 Manual Rev 770601 Model 9112 Specifications and Environmental Conditions 2 Specifications and Environmental Conditions 2 1 Specifications Table 1 Specificatins Operating 300 C to 1100 C Range 300 C 0 05 C 500 C 0 05 C 70092 0 1 C 100092 0 1 C 110092 0 1 C Stability 300 0 05 500 0 08 C 700 C 0 2 100092 0 25 C 1100
22. red with by the user For service or assistance please contact the manufacturer Hart Scientific Inc 799 East Utah Valley Drive American Fork UT 84003 9775 Phone 801 763 1600 Fax 801 763 1010 E mail support hartscientific com Manual Rev 770601 9 Specifications and Environmental Conditions 10 Manual Rev 770601 Model 9112 Model 9112 3 Safety Guidelines Operate the instrument in room temperatures between 5 50 C 41 122 F Allow sufficient air circulation by leaving at least 6 inches of space between the furnace and nearby ob jects Frontal clearance needs to allow for safe and easy insertion and removal of probes for calibration The furnace 15 a precision instrument though it has been designed for optimum dura bility and trouble free operation it must be handled with care The instrument should not be operated in wet oily dusty or dirty environ ments It is important to keep the well of the in strument free of any foreign matter Do not operate near flammable materials DO NOT use fluids to clean out the well The furnace generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be ex tremely hot when removed from the furnace Cautiously handle probes to prevent personal injury Carefully place probes on a heat resis tant surface or rack until they are at room tem perature Use only a grounded AC mains supply of the appropriate
23. the furnace may be impaired or safety hazards may arise The over temperature cut out should be checked every 6 months to see that it is work ing properly Maintenance 24 Manual Rev 770601 Model 9112 iagram D iring 25 Manual Rev 770601 JO 133HS VIN avos ISVITIY dv I ISN TOY INOO dW 07 3SNH WALSAS 72 05 109 8 9 SA ASIMYSHLO SSITNN DMV 9L 1 6 TY ON SMA ON WOS 8215 NVYOVIO 2116 WAY 9 4 fo been 1 0091 58 108 ava IVAOYddY T 0 290798 2141139198 AVTIN HVLN LINYSVITd PASO i CAY LHM vl M18 d3Y LHM gt 07 940 8 NHO NIS LHM r l sia NUO MISIHM 2 421V3H 6 2108 NadO DUO HOLIMS TV
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