Start-Up; Gas Reading Display - Oldham OLCT 80 User Manual

Start-up

Preliminary inspection
Check the following:
■
That wiring was performed correctly.
■
That the detector housing is grounded.
■
That the braided shield of the connection cable is connected to the ground of
the central system.
■
That the device is securely mounted (screws, cable gland, cover screwed on
and locked).
Powering the detector
1. Block the central measuring controller or PLC to avoid accidentally triggering
any alarms during the procedure.
2. Power the detector.
3. Once the reading has stabilized, switch the central controller to normal
mode.
Stabilization time
After the device is mounted, it is important to allow the detector's temperature to
stabilize. Also, once the detector is powered, certain sensors require additional
pre-heating time If adjustments are made before the time indicated below has
passed, readings may be incorrect, which could put people and goods in
danger. Total wait time is summarized below:
■
Combustible sensor: 2 hours
■
Oxygen sensor: 1 hour
■
Electrochemical sensor: 1 hour, except for:
- NO (nitric oxide):
- HCl (hydrochloric acid):
- ETO (ethylene oxide):
■
Semiconductor sensor: 4 hours
■
Infrared sensor (XPIR): 2 hours

Gas reading display

Normal display (no fault)
■
The display indicates the concentration measured,
the type of gas and the unit for the selected
channels (Channel Configuration menu, on page
Erreur ! Signet non défini.).
■
The indicator light ( ) blinks.
12 hours
24 hours
36 hours
Figure 54: display
under normal
operating conditions.
6 – Operation
70