95-8556
11.3
H-5
Switch Access Procedure
NOTE
It is strongly recommended to document all OPECL gas detector network addresses as well as the addresses
of all other LON devices on the Address Identication Chart before disassembling and programming the OPECL
gas detectors.
Removal of four stainless steel flange bolts and the front electronic module of the OPECL receiver from the bulkhead
is required in order to gain access to the network address DIP switch. Tools required for this procedure include a
4mm hex wrench and a torque wrench capable of accurately measuring 40 inch-pounds.
1. Remove 24 Vdc power from the OPECL detector.
2. Remove the four stainless steel flange bolts using a 4mm hex wrench. Take care to properly support the
electronic module as the last flange bolt is removed.
3. Carefully remove the electronic module by extracting it straight out from the bulkhead.
4. Set the network address switches.
5. Ensure that the module O-ring is intact and undamaged.
6. Reinstall the electronic module by inserting it straight into the bulkhead.
NOTE
Take care to properly align the module’s electrical connector with the bulkhead connector before attempting to
fully insert the module. Failure to do so may result in damage to the module and/or bulkhead.
7. Insert and tighten the four flange bolts in an opposing consecutive order in two stages — first partially tighten all
four bolts equally, and then fully tighten each bolt in an opposing order to 40 inch-pounds of torque.
8. Apply power after all network addresses have been programmed and all field enclosures are properly installed.
TYPICAL APPLICATIONS
Figure H-3 is a simplified drawing of a typical EQP system. This system includes an EQP Controller and various LON
field devices.
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