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Transcat JOFRA ITC-155 A Service Manual

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Service Manual

Temperature Calibrator
JOFRA ITC-155/320/650 A
 Copyright 2002 AMETEK DENMARK A/S

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  • Page 1: Service Manual

    Service Manual Temperature Calibrator JOFRA ITC-155/320/650 A  Copyright 2002 AMETEK DENMARK A/S...
  • Page 2 21-08-2003...

  • Page 3: Table Of Contents

    List of contents General ..................4 1.1 Introduction ................... 4 1.2 Safety instructions ................ 6 Maintenance................7 2.1 Adjusting and calibrating the instrument........7 2.2 Caring for the instrument after use ..........14 Repairs ..................16 3.1 Trouble shooting ................. 16 3.2 Replacement of spare parts ............22 3.3 Adjusting and testing PCBs ............

  • Page 4: General

    General Introduction This service manual applies to the following instruments: • Jofra ITC-155 A • Jofra ITC-320 A • Jofra ITC-650 A All calibrators are produced from quality components by skilled staff. Each calibrator passes several tests during assembly and undergoes a final inspection and test following a special calibration procedure laid down by our technical staff.

  • Page 5: Technical Assistance

    Technical assistance The following information regarding testing and repair was correct at the time of issue. Do not hesitate to contact our service department or your local distributor, however, if you have further queries. AMETEK DENMARK A/S Gydevang 32- 34 DK-3450 Allerød Phone: +45 48 16 80 00 Fax:...

  • Page 6: Safety Instructions

    Safety instructions Read this manual carefully before doing any maintenance on the instruments! Please follow the instructions and procedures described in this manual in order to maintain the instruments correctly and to avoid any personal injuries and/or damage to the instruments.

  • Page 7: Maintenance

    Maintenance Adjusting and calibrating the instrument You are advised to return the calibrator to Ametek Denmark A/S or an accredited laboratory at least once a year for calibration and adjustment. Alternatively, you can calibrate/adjust the calibrator yourself. You will need a calibrated, traceable sensor and thermometer with an accuracy better than ±0.1°C / ±0.18°F.
  • Page 8 Caution… • The well and the insertion tube must be clean before use. • The insertion tube must never be forced into the well. The well could be damaged as a result, and the insertion tube may get stuck. • Do not touch the tip of the sensor when it is removed from the insertion tube/well –...
  • Page 9 To enter service mode, switch on the instrument while pressing the button. Press until Calib. Proc. is reached: Press to accept. The instrument will now heat up/cool down to reach the first of the 5 calibration temperatures: °C °C Once the calibrator is stable, press to enter the true temperature found using the reference thermometer (the calibration temperature is suggested as a reference...
  • Page 10 Permitted tolerances: • ITC-155 A : ±0.10°C / 0.18°F • ITC-320 A : ±0.15°C / 0.27°F • ITC-650 A : ±0.20°C / 0.36°F There are two possible outcomes: If the instrument detects excessive deviations for one or more steps, the display will read =ERR. at the in the top. A message reading AdJ. will flash at the bottom of the display to indicate that an adjustment is required: If, on the other hand, the deviations are found to be within the...
  • Page 11 - Press when ERR. Cont. is displayed to accept the calibration although the deviations are outside the permitted tolerances. - Press when ERR. AdJ. is displayed to calculate new coefficients. If the coefficients deviate by more than 4% from the standard values, the instrument will read ERROR 2 in the display.
  • Page 12 - Press when the display reads OK AdJ. to calculate new coefficients even though the calibration was within the permitted tolerances. A new calibration procedure will start. Adjust the date by toggling through the available days, months and years. Begin by selecting the required day as shown below: Press to select the required day in the interval 1-...
  • Page 13 Press to accept your selection. The day will be adjusted if necessary to ensure the legality of the date. Finally, the day, month and year will flash: Press to accept the date. press to cancel the whole selection. Switch the instrument off and on again using the power control switch and cool down the instrument.

  • Page 14: Caring For The Instrument After Use

    Caring for the instrument after use The following routine must be observed before the insertion tube is removed and the instrument switched off: Over 100°C/212°F If the calibrator has been heated up to temperatures above 100°C/212°F, you must wait until the instrument reaches a temperature below 100°C/212°F before you switch it off.
  • Page 15 Remove the insertion tube from the calibrator using the tool for insertion tube as shown in Fig. 2. Switch off the calibrator using the power control switch. Caution… • The insertion tube must always be removed from the calibrator after use. The humidity in the air may cause verdigris to form on the insertion tube inside the instrument.

  • Page 16: Repairs

    Repairs Warning The calibrator must be switched off before any attempt is made to service the instrument. Note… Ametek Denmark’s liability ceases if: • Parts are replaced/repaired using spare parts which are not identical to those recommended by the manufacturer. •...
  • Page 17 • If supply voltage is lower than 22V, replace POWER PCB and adjust POWER PCB. Error: Likely cause: Solution: The measured temperature is Check RTD sensor. out of range: At 23°C the impedance should be 109 ohm ±3 ohm. • If RTD sensor is OK, replace CONTROLLER PCB and then adjust and re-calibrate the unit.
  • Page 18 Error: Likely cause: Solution: Defective CONTROLLER PCB: Replace the CONTROLLER PCB and then adjust and re-calibrate the unit. Error: Fan does not work. Likely cause: Solution: Fan obstructions: Remove any obstructions. Supply for fan: ITC-155 A Check the supply on CN2 terminal 1(+) and terminal 2(-) on the POWER PCB.
  • Page 19 Error: Switch test does not work. Likely cause: Solution: Defective I/O PCB: • Check signal from switch test input. The voltage between CN2 terminal 1(+) and CN2 terminal 2(-) on the CONTROLLER PCB changes from 0V to 5V when the switch test input changes from closed to open.
  • Page 20 • If the voltage on CN6 is correct and the calibrator does not cool down sufficiently, replace the well and re-calibrate the unit. Defective POWER PCB: If the voltage on CN3 is less than 26V and the voltage on CN6 differs from 0.330V ±0.005V, adjust R9 until the voltage is 0.330V ±0.005V.
  • Page 21 Defective CONTROLLER PCB: If the 2 light diodes on the POWER PCB are not lit, measure the voltage on CN3 between terminal 3(+) and terminal 4(-), terminal 5(+) and terminal 6(-) and between terminal 9(+) and terminal 10 (- If the first two voltages are less than 0.6V and the last voltage is less than 1V, change CONTROLLER PCB and adjust...

  • Page 22: Replacement Of Spare Parts

    Replacement of spare parts See exploded views in Chapter 4.0. Caution… Remember to disconnect the instrument from the mains supply before it is dismantled. Necessary tools: • Wire cutter • Screw drivers • 7 mm wrench Removal of display and keyboard unit (exploded views, pos.
  • Page 23 4. The top frame can now be removed entirely to render the interior of the instrument accessible. Removal of Power PCB (Section 4.2, exploded view - ITC-155 A 1. Remove the support plate (pos. 20) by pulling it up. Disconnect the 3 cables on the Power PCB which run to the fan (pos.
  • Page 24 2. Loosen the ground wire (pos. 22) connecting the well unit to the bottom part. 3. Cut the straps holding the wire from the fan close to the wires from the well. 4. Pull out the well (pos. 20). Remember that it is necessary to calibrate the instrument after the well has been removed/replaced.
  • Page 25 For ITC-155 A: Turn the well upside down so that Connection PCB is facing upwards. Loosen the 2 wires in the 4-poled connector (CN3). Loosen the 4 wires in the 4-poled connector (CN1). Caution… To ensure the right reassembling of the 4 wires, it is very important that the wires are marked before they are disconnected.
  • Page 26 Note… Instruments should be reassembled in reverse order. Ensure that all parts are in good working order and that all wires are connected correctly. 21-08-2003 123313...

  • Page 27: Adjusting And Testing Pcbs

    Adjusting and testing PCBs 3.3.1 CONTROLLER PCB The CONTROLLER PCB must be adjusted if it has been replaced. Adjustment Set up the dipswitch and solder the resistors R1 and R6 with values as shown in the table. Dipswitch 1 = ON Model S1 (Dipswitch) 1 2 3 4 5...

  • Page 28: Power Pcb Itc-155 A

    The entered serial number is now stored in the calibrator. Run the calibration and adjustment procedure on the calibrator as described in the manual. 3.3.2 POWER PCB ITC-155 A The POWER PCB must be adjusted if the POWER PCB or CONTROLLER PCB have been replaced.

  • Page 29: Testing The Controller Pcb And Keyboard

    Adjustment Switch off the calibrator using the power control switch. Turn the present potentiometer R37 counter clockwise as far as it will go. Then turn the potentiometer R37 clockwise 15 times. Hold down the key while turning on the calibrator using the control switch.

  • Page 30: Spare Parts And Drawings

    Spare parts and drawings 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. 21-08-2003 123313...
  • Page 31 List of spare parts – ITC-155 A Pos. Spare parts Number (Compare exploded view section 4.2) Keyboard 123421 16 circuit ribbon cable 105776 10 circuit ribbon cable 105112 Reference sensor cable w. 4-poled connector 105140 Grid plate 105000 Cable for Peltier elements 123061 Power PCB 123040...
  • Page 32 List of spare parts – ITC-320 A Pos. Spare parts Number (Compare exploded view section 4.3) Keyboard 123421 16 circuit ribbon cable 105776 10 circuit ribbon cable 105112 Reference sensor 123442 Grid plate 105000 Cable for power inlet 105100 Thermocouple 105081 Power PCB 105248...
  • Page 33 List of spare parts – ITC-650 A Pos. Spare parts Number (Compare exploded view section 4.4) Keyboard 123421 16 circuit ribbon cable 105776 10 circuit ribbon cable 105112 Reference sensor 123442 Grid plate 105000 Cable for power inlet 105100 Thermocouple 105081 Power PCB 105248...

  • Page 34: Exploded View - Itc-155 A

    Exploded view – ITC-155 A 21-08-2003 123313...

  • Page 35: Exploded View - Itc-320 A

    Exploded view – ITC-320 A 123313 02 21-08-2003...

  • Page 36: Exploded View - Itc-650 A

    Exploded view – ITC-650 A 21-08-2003 123313...

  • Page 37: Wiring Diagram - Itc-155 A

    Wiring diagram – ITC-155 A 123313 02 21-08-2003...

  • Page 38: Wiring Diagram - Itc-320/650 A

    Wiring diagram – ITC-320/650 A 21-08-2003 123313...

This manual is also suitable for:

Jofra itc-650 aJofra itc-320 a

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