Acknowledging An Alarm - Oldham OLCT 80 User Manual

Display in the event of a fault
■
The display will read "8888" followed by a fault
code.
■
The DEF fault indicator light will illuminate. See
page 111 for a list of error and fault codes.
Verification
This pertains to catalytic sensors if the Verification setting has been activated
for the channel (see page 27 or 30).
■
For safety reasons, when measuring a gas
concentration above 100% LEL, the word "sup"
will appear on the display and the fault and alarm
indicator lights will illuminate. Meanwhile, the
reading will be interrupted and the output signal
will remain at 23.2 mA.
■
To exit this mode (after verifying the absence of
an explosive atmosphere using a portable
explosimeter for instance), press ENTER on the
IR20 remote control. Once "ACQUIT ?" appears,
press ENTER again. The alarm indicator lights
will turn off and the alarm relays will switch to
non-alarm positions.

Acknowledging an alarm

■
For alarms configured for Manual
acknowledgment, point the infrared remote
control to the sensor reporting the alarm and
press ENTER. The word "ACQUIT ?" will appear
on the display. Press ENTER again to
acknowledge the alarm. The alarm indicator
lights will turn off and the alarm relays will switch
to non-alarm positions if the measurement has
fallen below/risen above the defined alarm
threshold.
■
The user can press ESC to leave the menu
without acknowledging the alarm(s).
Figure 58: alarm acknowledgment diagram.
Figure 55: display in
the event of a fault.
Figure 56: detection of
high LEL
concentration.
Figure 57: press
ENTER on the reading
to acknowledge an
alarm.
6 – Operation
71