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Service Manual

Temperature Calibrator

JOFRA ITC-155/320/650 A

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Copyright 2002 AMETEK DENMARK A/S

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Summary of Contents for JOFRA ITC-155 A

Page 1: ...Service Manual Temperature Calibrator JOFRA ITC 155 320 650 A Copyright 2002 AMETEK DENMARK A S ...

Page 2: ...2 21 08 2003 ...

Page 3: ...uble shooting 16 3 2 Replacement of spare parts 22 3 3 Adjusting and testing PCBs 27 3 3 1 CONTROLLER PCB 27 3 3 2 POWER PCB ITC 155 A 28 3 3 3 POWER PCB ITC 320 650 A 28 3 3 4 Testing the CONTROLLER PCB and keyboard 29 4 0 Spare parts and drawings 30 4 1 Spare parts 30 4 2 Exploded view ITC 155 A 34 4 3 Exploded view ITC 320 A 35 4 4 Exploded view ITC 650 A 36 4 5 Wiring diagram ITC 155 A 37 4 6 ...

Page 4: ... assembly and undergoes a final inspection and test following a special calibration procedure laid down by our technical staff Caution If you decide to check and or re calibrate the calibrator you must always use certified test equipment only and ensure proper contact between the test probe and the well of the calibrator Operating guidelines and technical specifications are outlined in reference m...

Page 5: ...o not hesitate to contact our service department or your local distributor however if you have further queries Note Please note that we would be very interested in hearing from you if you have any ideas or suggestions for changes to our products AMETEK DENMARK A S Gydevang 32 34 DK 3450 Allerød Phone 45 48 16 80 00 Fax 45 48 16 80 80 ...

Page 6: ...use heat transfer fluids such as silicone oil paste etc These fluids may penetrate the calibrator and cause damage or create poisonous fumes Caution Hot surface This symbol is engraved in the grid plate Do not touch the grid plate the well or the insertion tube as the calibrator is heating up they may be very hot Do not touch the handle of the calibrator during use it may be very hot Note The prod...

Page 7: ...acy better than 0 1 C 0 18 F Ensure that the ambient temperature is 23 C 3 C 73 4 F 5 4 F To calibrate adjust the instrument five different temperatures are needed These are all preset in the various types of instruments The calibration temperatures are ITC 155 A 1 23 C 9 4 F 2 20 C 68 F 3 60 C 140 F 4 100 C 212 F 5 155 C 311 F ITC 320 A 1 50 C 122 F 2 120 C 248 F 3 180 C 356 F 4 250 C 482 F 5 320...

Page 8: ...nsertion tube may get stuck Do not touch the tip of the sensor when it is removed from the insertion tube well it may be very hot Protect the sensor head from heat radiation from the well by use of thermal protection shield part no 104216 or similar Fig 1 A A Thermal protection shield CA LI B R A T ION I NS TRU M EN T S Insertion tube Reference sensor Reference thermometer Jofra DTI 1000 ...

Page 9: ...alibrator is stable press or to enter the true temperature found using the reference thermometer the calibration temperature is suggested as a reference point C Press to accept the temperature Repeat this procedure for TEMP 2 TEMP 3 TEMP 4 and TEMP 5 All five calibration temperatures and associated true temperatures have now been entered The instrument will now check whether the true temperatures ...

Page 10: ... required If on the other hand the deviations are found to be within the permitted tolerances the instrument will display the text OK at the top of the display The text Cont will flash at the bottom of the display to indicate that you may continue without adjustments If the calibration results in the message ERR AdJ the following options are available Press to cancel the function and return to ser...

Page 11: ...n the display The calculated coefficients will be ignored Press to cancel the function and return to service mode or press to repeat the calibration If the coefficients are within the permitted tolerances the instrument will start a calibration If the display reads OK Cont the following options are available Press to toggle between OK Cont and OK AdJ Press to cancel OK Cont or OK AdJ and return to...

Page 12: ...ll start Adjust the date by toggling through the available days months and years Begin by selecting the required day as shown below Press or to select the required day in the interval 1 31 Press to accept your selection Press or to select the required month from JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Press to accept your selection Press or to select a year between 2001 2025 ...

Page 13: ... adjusted if necessary to ensure the legality of the date Finally the day month and year will flash Press to accept the date or press to cancel the whole selection Switch the instrument off and on again using the power control switch and cool down the instrument 11 12 13 ...

Page 14: ... 100 C 212 F you must wait until the instrument reaches a temperature below 100 C 212 F before you switch it off Below 0 C 32 F applies only to ITC 155 A models If the calibrator has reached a temperature below 0 C 32 F ice crystals may form on the insertion tube and the well This in turn may cause verdigris to form on the material To prevent this from happening simply heat up the calibrator to 50...

Page 15: ...ent There is a risk that the insertion tube may become stuck if this is allowed to happen The insertion tube must be removed to avoid damage to the instrument if the calibrator is to be transported long distances Warning Never leave hot insertion tubes which have been removed from the calibrator unsupervised they may constitute a fire hazard If you intend to store the calibrator in the optional al...

Page 16: ...inal parts are used in any way when operating the instrument Ametek Denmark s liability is restricted to errors which originated in the factory 3 1 Trouble shooting Error No light in display Likely cause Solution Defective fuses Supply to CONTROLLER PCB Check fuses in the mains inlet Check fuses on the POWER PCB inside the calibrator Check the supply minimum 22V on CN1 terminal 1 and CN1 terminal ...

Page 17: ...djust and re calibrate the unit Otherwise replace RTD sensor and re calibrate the unit Error Likely cause Solution The new coefficients calculated by the unit in the CALIB Proc deviate by more than 4 from the standard values The calculated coefficients will be ignored Check the accuracy of the reference thermometer used for calibration and repeat the calibration adjustment procedure If the calibra...

Page 18: ...upply for fan Remove any obstructions ITC 155 A Check the supply on CN2 terminal 1 and terminal 2 on the POWER PCB If supply voltage is 11 18V replace fan If supply voltage is lower than 11V replace and adjust POWER PCB ITC 320 A ITC 650 A Check the supply on CN6 terminal 1 and terminal 2 on the POWER PCB If supply voltage is 11 18V replace fan If supply voltage is lower than 11V replace and adjus...

Page 19: ...hange and the voltage between CN1 terminal 3 and CN1 terminal 4 on the I O PCB is 5V replace the I O PCB Otherwise replace the CONTROLLER PCB and adjust and re calibrate the unit Error Calibrator does not cool or heat sufficiently ITC 155 A only Likely cause Solution Defective well Set the SET temperature to 40 C Measure the voltage between CN6 terminal 1 and terminal 2 and the voltage between CN3...

Page 20: ...e the POWER PCB Error Calibrator does not heat ITC 320 A ITC 650 A Likely cause Solution Defective POWER PCB Check impedance of the heating elements Approx 23 ohm for ITC 320 A ITC 650 A Turn on the instrument and set the SET temperature to 320 C ITC 320 A or 650 C ITC 650 A Check that relay K1 has been pulled If the relay has not been pulled check that the over temperature sensor ITC 320 A ITC 65...

Page 21: ...nge CONTROLLER PCB and adjust and re calibrate the calibrator If not change and adjust the POWER PCB Error RS232 interface can not be initialized The display on the calibrator does not show REMOTE Likely cause Solution The connection between PC and calibrator is not correct Check that the calibrator is connected to the selected RS232 port Check that the correct RS232 is used Defective I O PCB Repl...

Page 22: ...neath the screws 3 Lift the unit by carefully loosening it with a small screwdriver near the handle of the top frame 4 To remove the unit completely disconnect the 3 wires The 16 circuit ribbon cable pos 3 the 10 circuit ribbon cable pos 4 and the reference sensor wire ending in a 4 poled connector pos 5 The top frame must be removed if further replacements are necessary B Removal of top frame exp...

Page 23: ...les from the heating elements 8 poled connector pos 10 from the power inlet 4 poled connector pos 11 from the thermocoupler 2 poled connector pos 12 and from the fan pos 13 2 It is now possible to retract the Power PCB pos 14 from the instrument Note If the Power PCB has been replaced you must adjust the new PCB in accordance with section 3 3 D Removal of well Please follow steps A B and C for all...

Page 24: ... transformer section 4 2 exploded view ITC 155 A pos 16 You can remove the transformer in ITC 155 A 1 Follow steps A through C 2 Disconnect the wires from the transformer to the power inlet 3 Loosen the nut with a 7 mm wrench and remove the transformer G Removal of I O plate exploded views pos 19 1 Follow steps A through C 2 The I O plate is secured by 4 screws 2 from below through the bottom fram...

Page 25: ...ce it with the new spare part 123449 6 Reassemble the unit carefully in reverse order For ITC 320 A and ITC 650 A 1 Turn the well upside down to expose the bottom of the unit 2 Use a wire cutter to cut the straps holding the wires together 3 Remove the screw and clamp holding the reference sensor in position 4 Pull out the old reference sensor and replace it with the new spare part 123442 5 Before...

Page 26: ...26 21 08 2003 123313 02 Note Instruments should be reassembled in reverse order Ensure that all parts are in good working order and that all wires are connected correctly ...

Page 27: ... R6 with values as shown in the table Dipswitch 1 ON Model R1 R6 S1 Dipswitch ITC 1 2 3 4 5 155 A 73R2 464R 0 1 0 1 1 320 A 73R2 698R 1 0 0 1 1 650 A 73R2 698R 0 0 0 1 1 Connect the calibrator to a PC with a serial null modem cable Turn on the power and run the SetSerial program The program reads the serial number stored in the calibrator Enter the serial number labeled on the cabinet and press Go...

Page 28: ...trol switch Turn the preset potentiometer R9 counter clockwise as far as it will go Switch the calibrator on using the power control switch Set the calibrator to 20 C Connect a voltmeter to CN6 Adjust R9 until the voltage for CN6 reaches 0 330V 0 005V 7 Switch off the calibrator using the power control switch 3 3 3 POWER PCB ITC 320 650 A The POWER PCB must be adjusted if the POWER PCB or the CONT...

Page 29: ... temperature the display will show a figure which is updated every 2 6 seconds Turn R37 clockwise until the figure reads between 95 0 and 97 5 7 Switch off the calibrator using the power control switch 3 3 4 Testing the CONTROLLER PCB and keyboard Switch the calibrator on using the power control switch and press for 1 second when the display shows the calibration date All parts of the display shou...

Page 30: ... and drawings 4 1 Spare parts All parts listed in the lists of spare parts can be obtained from the factory through our dealer see exploded views Please contact your dealer for assistance if you require parts which do not appear on the lists ...

Page 31: ...3 Power PCB 123040 15 Well cpl incl sensor 123422 16 Transformer 105137 17 Fan 123551 19 I O plate with RS232 connection 123413 23 Wire for I O plate 145 mm 105149 Reference sensor 123449 Controller PCB w R1 R6 105245 Washer for display 104559 Fuse 115V 2AT 105014 Fuse 230V 1AT 105007 Fuse 4 A T 5x20mm IEC 105334 Fan spacer 105455 Washer M6 for fan spacer 105368 Rubber plug for fan spacer 122800 R...

Page 32: ... 17 Fan 105264 19 I O plate with RS232 connection 123434 20 Well cpl incl sensor 123447 22 Wire for well 100 mm 123217 23 Wire for I O plate 145 mm 105149 Controller PCB w R1 R6 105246 Washer for display 104559 Rubber foot black 60G032 Fuse 115V 10AF 60B302 Fuse 230V 5AF 60B301 Fuse 63 mA T 5x20mm IEC 105333 Fuse 100 mA T 5x20mm IEC 123850 Fuse 160 mA T 5x20mm IEC 124494 Fuse 500mA T 5x20mm IEC 12...

Page 33: ... 17 Fan 105264 19 I O plate with RS232 connection 123434 20 Well cpl incl sensor 123426 22 Wire for well 100 mm 123217 23 Wire for I O plate 145 mm 105149 Controller PCB w R1 R6 105246 Washer for display 104559 Rubber foot black 60G032 Fuse 115V 10AF 60B302 Fuse 230V 5AF 60B301 Fuse 63 mA T 5x20mm IEC 105333 Fuse 100 mA T 5x20mm IEC 123850 Fuse 160 mA T 5x20mm IEC 124494 Fuse 500mA T 5x20mm IEC 12...

Page 34: ...34 21 08 2003 123313 02 4 2 Exploded view ITC 155 A 18 21 16 17 5 11 10 12 19 4 14 13 3 20 9 1 6 7 8 2 15 ...

Page 35: ...123313 02 21 08 2003 35 4 3 Exploded view ITC 320 A 18 23 22 11 19 4 17 5 10 12 13 15 9 21 14 3 1 6 2 20 7 8 ...

Page 36: ...36 21 08 2003 123313 02 4 4 Exploded view ITC 650 A 18 23 22 11 19 4 17 13 10 12 14 21 3 9 1 15 2 6 7 8 20 5 ...

Page 37: ...N5 3 CN5 4 CN2 1 CN 1 CN 1 CN 2 CN3 1 CN3 2 CN3 3 CN3 4 1 1 1 1 10 CN 1 I O PCB RS232 SWITCH TEST SWITCH TEST 10 16 16 CN2 2 CN7 3 CN1 4 CN1 2 CN1 3 CN3 1 CN3 2 CN3 3 CN4 1 CN4 2 CN4 3 CN4 4 CN3 4 POWER PCB CONNECTION PCB CONTROLLER PCB TRAFO 144VA FUSE AND VOLTAGE SELECTOR CN5 2 CN5 1 CN5 5 CN5 6 CN7 5 CN7 6 CN7 2 CN7 1 CN2 1 RED TE 1 TE 2 15V 6A 15V 6A BLACK CN2 4 CN2 2 CN2 3 RED BLACK RED RED B...

Page 38: ...3 CN1 2 CN1 1 HE 1 HE 2 115V 425W 115V 425W WELL THERMOCOUPLER TYPE K 24 VDC FAN 105356 Rev 00 Page 6 R3 PT 100 CN6 1 CN 3 CN 1 CN 2 CN3 1 CN3 2 CN3 3 CN3 4 1 1 1 1 10 CN 1 I O PCB RS232 SWITCH TEST SWITCH TEST 10 16 16 CN6 2 CN1 6 CN1 7 CN1 8 CN4 1 CN4 2 POWER PCB CONTROLLER PCB WITH FUSE AND VOLTAGE SELECTOR R 1 R 2 33R 25W 33R 25W HE 1 HE 2 115V 125W 115V 125W ...

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