Ametek c Service Manual
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Ametek c Service Manual

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Service Manual
Temperature Calibrators
JOFRA CTC-140/320/650 A/B, CTC-1200 A
JF INSTRUMENTS MTC-140/320/650 A
 Copyright 2003 AMETEK DENMARK A/S

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  • Page 1 Service Manual Temperature Calibrators JOFRA CTC-140/320/650 A/B, CTC-1200 A JF INSTRUMENTS MTC-140/320/650 A  Copyright 2003 AMETEK DENMARK A/S...
  • Page 2 26-03-2004...

  • 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 ..........15 Repairs ..................17 3.1 Trouble shooting ................. 17 3.2 Replacement of spare parts ............25 3.3 Adjusting and testing PCBs ............

  • Page 4: General

    General Introduction This service manual applies to the following instruments: • Jofra CTC-140 A (with or without RS232) • Jofra CTC-320 A (with or without RS232) • Jofra CTC-320 B (with or without RS232) • Jofra CTC-650 A (with or without RS232) •...
  • Page 5 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...

  • 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 (all MTC and CTC instruments...
  • Page 8 CTC-1200 A 50°C / 122°F 300°C / 572°F 600°C / 1112°F 900°C / 1652°F 1200°C / 2192°F Prepare to adjust/calibrate the instrument by doing the following (see Fig. 1): Caution… • The well and the insertion tube must be clean before use.
  • Page 9 Reference sensor Insulation tube Reference thermometer Jofra DTI-1000 Insulation 30x30 mm Insertion tube Thermal protection shield Fig. 1 To enter service mode, switch on the instrument while pressing the button. Press until Calib. Proc. is reached: 123200 03 26-03-2004...
  • Page 10 The instrument will now check whether the true temperatures which have been entered are within the permitted tolerances. Permitted tolerances: • CTC-140 A, CTC-320 A / B, MTC-140 A, MTC-320 A : ±0.15°C / 0.27°F • CTC-650 A, MTC-650 A : ±0.25°C / 0.45°F •...
  • Page 11 • CTC-1200 A : ±0.8°C / ±1.44°F There are two possible outcomes: If the instrument detects excessive deviations for one or more steps, the display will read =ERR. at the top. A message reading AdJ. will flash at the bottom of the display to indicate that an adjustment is...
  • Page 12 - 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 13 - 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 14 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 15: Caring For The Instrument After Use

    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. Below 0°C/32°F (applies only to CTC/MTC-140 A models) If the calibrator has reached a temperature below 0°C/32°F,...
  • Page 16 If you intend to store the calibrator in the aluminium carrying case (optional – for CTC) after use, you must ensure that the instrument has cooled to a temperature below 100°C/212°F before placing it in the carrying case. 26-03-2004...

  • Page 17: Repairs

    Parts are replaced/repaired using spare parts which are not identical to those recommended by the manufacturer. • non-original parts are used in any way when operating the instrument. Ametek Denmark’s liability is restricted to errors which originated in the factory. Trouble shooting Error: No light in display...
  • Page 18 Likely cause: Solution: The measured temperature is Check RTD sensor (not CTC-1200 out of range: At 23°C the impedance should be: • 1090 ohm ±20 ohm (CTC- 140 A, CTC-320 A/B, MTC- 140/320 A) • 109 ohm ±3 ohm (CTC-650 A/B, MTC-650 A).
  • Page 19 Error: Likely cause: Solution: The new coefficients calculated Check the accuracy of the by the unit in the CALIB. Proc. reference thermometer used for deviate by more than 4% from calibration and repeat the the standard values. The calibration/adjustment procedure. calculated coefficients will be If the calibrator shows ERROR ignored:...
  • Page 20 Error: Fan does not work. Likely cause: Solution: Fan obstructions: Remove any obstructions. Supply for fan: CTC-140 A, MTC-140 A Check the supply on CN2 terminal 1(+) and terminal 2(-) on the POWER PCB. • If supply voltage is 11-18V, replace fan.
  • Page 21 MTC-140 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 terminal 1(+) and terminal 2(-). If the voltage on CN3 is higher than 18V, replace the well and re-calibrate the unit.
  • Page 22 - approx. 22 ohm for CTC-650 - approx. 4-5 ohm for CTC- 1200 A Turn on the instrument and set the SET temperature to: - 320°C (CTC-320 A/B, MTC- 320 A) - 650°C (CTC-650 A/B, MTC- 650 A) or - 1200°C (CTC-1200 A) Check that relay K1 has been pulled.
  • Page 23 If the relay has not been pulled, check that the over- temperature sensor (CTC- 320/650 A, CTC-1200 A, MTC- 320/650 A) or the short circuit connector (CTC-320/650 B) has been mounted and is OK. If the sensor/switch is OK, change and adjust the POWER PCB.
  • Page 24 • CTC-1200 A only There is no LED on PCB and terminal 3 has no function but the rest of the text comply. Error: RS232 interface can not be initialized. The display on the calibrator does not show “REMOTE” (models with RS232 only).

  • Page 25: 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 26 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 - CTC-140 A, MTC-140 A 1. Disconnect the 3 cables on the Power PCB which run to the fan (pos.
  • Page 27 Removal of well Please follow steps A, B and C for all models. (Section 4.2, exploded view - CTC-140 A, MTC-140 A 1. Remove the plate (pos. 14) in front of the well by pulling it up. 2. Pull out the well (pos. 15). Remember that it is necessary to calibrate the instrument after the well has been removed/replaced.
  • Page 28 5. When reassembling the unit ensure that the well and the plates are placed in the exact same slots as before removal. (Section 4.5, exploded view - CTC-320 B 1. Remove the plate (pos. 14) in front of the well by pulling it up.
  • Page 29 - CTC-140 A MTC-140 A, You can remove the transformer in CTC-140 A, MTC-140 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.
  • Page 30 the plate. Replacement of reference sensor To replace the reference sensor in the well unit, follow steps A through D and then follow the procedure given below: For CTC-140 A, MTC-140 A: Turn the well upside down so that Connection PCB is facing upwards.
  • Page 31 For CTC-650 A, MTC-650 A: Turn the well upside down to expose the bottom of the unit. Use a wire cutter to cut the straps holding the wires together. Remove the screw and clamp holding the reference sensor in position. Pull out the old reference sensor and replace it with the new spare part 105476.
  • Page 32 Remove the screw and clamp holding the reference sensor in position. Pull out the old reference sensor and replace it with the new spare part 105291. Insert the new reference sensor in the same position as the old sensor. Ensure that the two wires in the bend between the ceramic tubes do not short-circuit.

  • Page 33: 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 34: Power Pcb Ctc-140 A, Mtc-140 A

    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.

  • Page 35: Power Pcb Ctc-320/650 A/B, Ctc-1200 A, Mtc- 320/650 A

    Release once the calibration date is displayed. Set the calibrator to max. temperature (320°C, 650°C or 1200°C) and press Instead of the SET temperature, the display will show a figure which is updated every 2.6 seconds.

  • Page 36: Testing The Controller Pcb And Keyboard

    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 should now be lit. Press again to continue. Press and check that the display reads MIN.

  • Page 37: Spare Parts And Drawings

    Spare parts and drawings Spare parts - generel 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 38: List Of Spare Parts - Ctc-140 A/-Rs, Mtc- 140 A

    List of spare parts – CTC-140 A/-RS, MTC- 140 A Pos. Spare parts Number (Compare exploded view, next page) Keyboard (CTC) 105247 Keyboard (MTC) 105436 16 circuit ribbon cable 105102 10 circuit ribbon cable 105112 Reference sensor wire w. 4-poled connector 105140 Grid plate 105000...
  • Page 39 Exploded view – CTC-140 A/-RS, MTC-140 A 123200 03 26-03-2004...

  • Page 40: List Of Spare Parts - Ctc-320 A/-Rs, Mtc- 320 A

    List of spare parts – CTC-320 A/-RS, MTC- 320 A Pos. Spare parts Number (Compare exploded view, next page) Keyboard (CTC) 105247 Keyboard (MTC) 105436 16 circuit ribbon cable 105102 10 circuit ribbon cable 105112 Reference sensor 105288 Grid plate 105000 Cable for power inlet 105100...
  • Page 41 Exploded view – CTC-320 A/-RS, MTC-320 A 123200 03 26-03-2004...

  • Page 42: List Of Spare Parts - Ctc-650 A/-Rs, Mtc- 650 A

    List of spare parts – CTC-650 A/-RS, MTC- 650 A Pos. Spare parts Number (Compare exploded view, next page) Keyboard (CTC) 105247 Keyboard (MTC) 105436 16 circuit ribbon cable 105102 10 circuit ribbon cable 105112 Reference sensor 105476 Grid plate 105000 Thermocoupler 105081...
  • Page 43 Exploded view – CTC-650 A/-RS, MTC-650 A 123200 03 26-03-2004...

  • Page 44: List Of Spare Parts - Ctc-320 B/-Rs

    List of spare parts – CTC-320 B/-RS Pos. Spare parts Number (Compare exploded view, next page) Keyboard 105247 16 circuit ribbon cable 105102 10 circuit ribbon cable 105112 Reference sensor 105290 Grid plate 105000 Cable for power inlet 105101 Power PCB 105249 Well, cpl.
  • Page 45 Exploded view – CTC-320 B/-RS 123200 03 26-03-2004...

  • Page 46: List Of Spare Parts - Ctc-650 B/-Rs

    List of spare parts – CTC-650 B/-RS Pos. Spare parts Number (Compare exploded view, next page) Keyboard 105247 16 circuit ribbon cable 105102 10 circuit ribbon cable 105112 Reference sensor 105291 Grid plate 105000 Cable for power inlet 105101 Power PCB 105251 Well, cpl.
  • Page 47 Exploded view – CTC-650 B/-RS 123200 03 26-03-2004...

  • Page 48: List Of Spare Parts - Ctc-1200 A-Rs

    List of spare parts – CTC-1200 A-RS Pos. Spare parts Number (Compare exploded view, next page) Keyboard 105247 16 circuit ribbon cable 105102 10 circuit ribbon cable 105112 Grid plate 124338 Power PCB 124264 Transformer 124335 105257 I/O plate with RS232 connection 124563 Well, cpl.
  • Page 49 Exploded view – CTC-1200 A-RS 123200 03 26-03-2004...

  • Page 50: Wiring Diagram - Ctc-140 A/-Rs, Mtc-140 A

    Wiring diagram – CTC-140 A/-RS, MTC-140 A 26-03-2004 123200...

  • Page 51: Wiring Diagram - Ctc-320/650 A/-Rs, Mtc- 320/650 A

    Wiring diagram – CTC-320/650 A/-RS, MTC- 320/650 A 123200 03 26-03-2004...

  • Page 52: Wiring Diagram - Ctc-320 B/-Rs

    4.10 Wiring diagram – CTC-320 B/-RS 26-03-2004 123200...

  • Page 53: Wiring Diagram - Ctc-650 B/-Rs

    4.11 Wiring diagram – CTC-650 B/-RS 123200 03 26-03-2004...

  • Page 54: Wiring Diagram - Ctc-1200 A-Rs

    4.12 Wiring diagram – CTC-1200 A-RS 26-03-2004 123200...

This manual is also suitable for:

Jofra ctc-320 aJofra ctc-320 bJofra ctc-650 aJofra ctc-650 bJofra ctc-1200 aJf instruments mtc-140 a ... Show all

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