Oldham olct 80, User Manual

Page: 77 / 120

6
– Operation
71
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.
Figure 55: display in
the event of a fault.
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.
Figure 56: detection of
high LEL
concentration.
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.
Figure 57: press
ENTER on the reading
to acknowledge an
alarm.
■
The user can press ESC to leave the menu
without acknowledging the alarm(s).
Figure 58: alarm acknowledgment diagram.