Det-Tronics OPECL Infrared Hydrocarbon Gas Detector - Manual (Page 27)

25 95-8556 10.1
REplacinG opEcl tRanSmittER/
REcEivER ElEctRonicS modulE
WarnIng
Do not open when an explosive gas atmosphere
may be present.
CaUtIon
only Det‑Tronics authorized personnel are allowed
to perform this repair.
CaUtIon
Replacement of the oPeCL transmitter or receiver
module requires disassembly of the device
housing. Remove power to the device before
disassembly.
CaUtIon
Th e M o d e l o P e C L d e te c to r c o n ta i n s
semiconductor devices that are sensitive to
electrostatic discharge (eSD). Use normal
precautions for handling eSD sensitive devices.
Handle the device by the housing, taking care not
to touch electronic components or terminals.
mODUlE REplaCEmENT pROCEDURE
Tools Required:
– 4 mm hex wrench
– Torque wrench capable of accurately measuring 40
inch-pounds
1. Bypass system alarms as needed, then remove 24
Vdc power from the OPECL detector.
2. Remove the four stainless steel flange bolts using
a 4 mm hex wrench. See Figure 22. Take care to
properly support the module as the last flange bolt is
removed.
3. Carefully remove the old module by extracting it
straight out from the bulkhead.
CaUtIon
Handle the new module carefully to prevent
damage. Since both the lens and circuit board
protrude beyond the edge of the housing, the
module should only be set down on its side to
prevent damage to the lens or circuit board.
4. Ensure that the o-ring on the replacement module
is present, undamaged, and correctly seated in the
groove on the housing. See Figure 23. This o-ring
is required to maintain the watertight integrity of the
OPECL housing.
Figure 22— Flange Bolt Location
FLANGE BOLTS (4)
A2498
INCORRECT
CORRECT
BE SURE O-RING IS FULLY SEATED
IN GROOVE ON HOUSING
A2499
Figure 23—O-Ring on OPECL Module