Ametek c User manual

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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List of contents
1.0 General ......................................................................................4
1.1 Introduction ................................................................................... 4
1.2 Safety instructions ........................................................................ 6
2.0 Maintenance..............................................................................7
2.1 Adjusting and calibrating the instrument....................................... 7
2.2 Caring for the instrument after use ............................................. 15
3.0 Repairs ....................................................................................17
3.1 Trouble shooting ......................................................................... 17
3.2 Replacement of spare parts ....................................................... 25
3.3 Adjusting and testing PCBs ........................................................ 33
3.3.1 CONTROLLER PCB......................................................... 33
3.3.2 POWER PCB CTC-140 A, MTC-140 A ............................ 34
3.3.3 POWER PCB CTC-320/650 A/B, CTC-1200 A, MTC-
320/650 A ......................................................................... 35
3.3.4 Testing the CONTROLLER PCB and keyboard............... 36
4.0 Spare parts and drawings .....................................................37
4.1 Spare parts - generel .................................................................. 37
4.2 List of spare parts – CTC-140 A/-RS, MTC- 140 A .................... 38
4.3 List of spare parts – CTC-320 A/-RS, MTC- 320 A .................... 40
4.4 List of spare parts – CTC-650 A/-RS, MTC- 650 A .................... 42
4.5 List of spare parts – CTC-320 B/-RS.......................................... 44
4.6 List of spare parts – CTC-650 B/-RS.......................................... 46
4.7 List of spare parts – CTC-1200 A-RS......................................... 48
4.8 Wiring diagram – CTC-140 A/-RS, MTC-140 A.......................... 50
4.9 Wiring diagram – CTC-320/650 A/-RS, MTC- 320/650 A........... 51
4.10 Wiring diagram – CTC-320 B/-RS .............................................. 52
4.11 Wiring diagram – CTC-650 B/-RS .............................................. 53
4.12 Wiring diagram – CTC-1200 A-RS ............................................. 54

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1.0 General
1.1 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)
• Jofra CTC-650 B (with or without RS232)
• Jofra CTC-1200 A (with RS232)
• JF Instruments MTC-140 A (without RS232)
• JF Instruments MTC-320 A (without RS232)
• JF Instruments MTC-650 A (without RS232)
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.
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 the
reference manual order no. 123198 for CTC instruments and in the
user manual order no. 105337 for MTC instruments. Please note that
these are only available in English.

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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.
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: [phone]
Fax: [phone]

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1.2 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.
Warning
• The calibrator is designed for interior use only and
should not be used in risk-prone areas, where
vapour or gas leaks, etc. may constitute an explosives
hazard.
• Never 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 product liability only applies if the instrument is
subject to a manufacturing defect. This liability
becomes void if the service personnel fails to follow the
maintenance instructions set out in this manual or uses
unauthorised spare parts.
• The instrument must not be exposed to draughts.

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2.0 Maintenance
2.1 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
except CTC-1200 A), ±1.4°C / ±2.5°F (CTC-1200 A only) . 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:
CTC-140 A / 1. -15°C / 5°F
MTC-140 A 2. 20°C / 68°F
3. 60°C / 140°F
4. 100°C / 212°F
5. 140°C / 284°F
CTC-320 A/B / 1. 50°C / 122°F
MTC-320 A 2. 120°C / 248°F
3. 180°C / 356°F
4. 250°C / 482°F
5. 320°C / 608°F
CTC-650 A/B / 1. 50°C / 122°F
MTC-650 A 2. 200°C / 392°F
3. 350°C / 662°F
4. 500°C / 932°F
5. 650°C / 1202°F

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CTC-1200 A 1. 50°C / 122°F
2. 300°C / 572°F
3. 600°C / 1112°F
4. 900°C / 1652°F
5. 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.
• 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 – it may be very hot.
Insulate the part of the sensor which is above the heating
well (use insulation tube part no. 65-F100 to 65-F107 and
insulation 30x30 mm part no. 105173).
Protect the sensor head from heat radiation from the well
by use of thermal protection shield (part no. 104216) or
similar.
A
B

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Fig. 1
cTo enter service mode, switch on the instrument while
pressing the button.
dPress or until Calib. Proc. is reached:
Thermal protection shield
CALIBRA
TI
ONI
NSTRUME
NTS
Insertion tube
Reference sensor
Reference thermometer
Jofra DTI-1000
Insulation 30x30 mm
Insulation tube
B
A

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ePress to accept.
The instrument will now heat up/cool down to reach the first
of the 5 calibration temperatures:
°C
°
C
fOnce the calibrator is stable, press or to enter the
true temperature found using the reference thermometer
(the calibration temperature is suggested as a reference
point):
°C
gPress 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 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
• CTC-650 B : ±0.35°C / 0.63°F