Det-Tronics 505 Combustible Gas Detector Transmitter with Combustible Gas Sensor CGS - Manual (Page 16)

13 95-8472 3.1
REPLACEMENT PARTS
An adequate supply of spare sensors should be kept
on hand for field replacement. For maximum protection
against contamination and deterioration, they should not
be removed from the original protective packaging until
the time of installation.
Always calibrate after replacing either the sensor or the
transmitter circuit board.
DEVICE REPAIR AND RETURN
Prior to returning devices, contact the nearest local
Detector Electronics office so that a Return Material
Identification (RMI) number can be assigned. A
written statement describing the malfunction must
accompany the returned device or component to
assist and expedite finding the root cause of the
failure.
Pack the unit properly. Always use sufficient packing
material. Where applicable, use an antistatic bag as
protection from electrostatic discharge.
NOTE
Det-Tronics reserves the right to apply a service
charge for repairing returned product damaged as
a result of improper packaging.
Return all equipment transportation prepaid to the factory
in Minneapolis.
NOTE
It is highly recommended that a complete spare
be kept on hand for field replacement to ensure
continuous protection.
Table 3—Troubleshooting Guide
SYMPTOM POSSIBLE CAUSE
Controller display shows full scale reading
Over 100% LFL gas at sensor. Take appropriate safety measures.
Transmitter not calibrated.
Defective sensor.
Power (+) shorted to signal.
No output from transmitter
Power supply failure.
Power or signal wiring problem.
Negative % LFL display at controller
No power to transmitter.
Transmitter not calibrated.
Sensor not connected.
Defective sensor.
SIG wire problem.
CAL/NORM switch in CAL position.
Signal level at controller different than at transmitter
Loose wiring connection.
Total signal wiring loop impedence too high.
Induced EMI/RFI interference from nearby EMI fields (motors, switches, etc.).
Improper earth ground connection of signal wire shield.