Instruction manual

SM425 INSTRUCTION MANUAL 12.0 TROUBLESHOOTING
196 42500001 REV A
3. A failure of the cold junction temperature sensor located at the detector terminal block occurred.
4. A failure of the electrical circuits inside the converter occurred.
If “C.J.Temp nge, the following may be problem:
rature range (-20°C
.
< Trouble
Before proceeding to the following troubleshooting procedure, examine whether or not the temperature of
l block is out of the operating temperature range. The operating temperature range
varies with the type of detector. If the detector terminal block is out of its operating temperature range,
2. Remove the wiring from terminals 5 and 6 of the detector and measure the resistance between
these terminals. If the resistance value is out of the range of 1 to 1.6 kΩ, the cold junction
temperature sensor is considered to be faulty. Replace that temperature sensor with a new one.
the cable is securely connected to the terminals. Verify
the resistance of the wiring between the converter and detector is 10 Ω or less.
ledyne Monitor Labs.
For Mod
rminals 5 and 6 of the detector and measure
the terminals is out of the range of
ires replacement.
converter and detector is 10Ω or less.
and inspection. Contact the
erature” is out of the -20°C to 150°C ra
1. The temperature of the detector terminal block is out of the operating tempe
to 150°C).
2. A failure of the cold junction temperature sensor located at the detector terminal block occurred.
3. A failure of the electrical circuits inside the converter occurred
shooting and Corrective Actions >
the detector termina
move the detector terminal block away from radiant heat.
For SM425P Detector:
1. Power off the converter.
3. Check for broken or shorted wires. Verify
4. If the wiring passes testing and inspection, an electronic failure has likely occurred. Contact the
service personnel at Te
el ZO21D Detector:
1. With converter power on, remove the wiring from te
the voltage between these terminals. If the voltage between
0.4 to 0.7 V range, the cold junction temperature sensor requ
2. If the voltage between the terminals is within the above range, check the cable for broken or
shorted wires. Verify the cable is securely connected to the terminals. Verify the resistance of the
wiring between the
3. An electronic failure has likely occurred if the wiring passes testing
service personnel at Teledyne Monitor Labs.