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OELD Operating Instructions
8 Maintenance
8 Maintenance
8.1 General
Periodically inspect the OELD and cabling for signs of physical damage. Clean the glass window with a damp cloth. Do not use
solvents or abrasive cleaners.
The OELD has no user serviceable parts. Honeywell Analytics recommend that the unit’s configuration and operation are checked
annually as a minimum.
The gas detectors connected to the OELD should be checked and if necessary zero and span calibrated as necessary by following
the procedures detailed in their operating instructions.
8.2 Display Module Replacement
In the unlikely event of failure, the electronics module can be replaced.
Caution
In addition to the instruction below, always observe company and site procedures with respect to working on equipment in the
hazardous area.
1. Remove the power from the OELD. Loosen the lock screw using the tool provided and carefully unscrew and remove the cover.
2. Lift the handle and take out the internal electronics module taking care not to place any undue strain on the connected cables.
3. Loosen the locking screws of the terminal blocks and unplug them from the underside of the module
4. It is recommended to record the serial number of the original electronics module and mark that serial number inside the
enclosure. In addition, retain a record of the original serial number of the module in the maintenance record for that installation.
5. Remove the terminal blocks from the replacement electronics module and plug in the original terminal blocks and wiring. Secure
using the locking screws. Should the OELD require rewiring, refer to Chapter 4 Electrical Connections.
6. Carefully replace the display module taking care not to place endue strain on the attached wiring.
7. Fully tighten the cover.
Caution
Take care to avoid trapping cables when replacing the display module.
Note
The replacement electronics module will have default settings for the threshold for local alarm indication and mA input level
settings, RS-485 communication settings, visual indicator and sensor settings. Use the OELD App to make changes that are
necessary.
