Oldham MX43 - Alarm and Relay Thresholds

22 MX43
User manual
Alarm and Relay Thresholds
Alarm thresholds, relay programming, the management of time delays, and
methods of release are controlled over the COM43 application.
Note: It is possible to modify an alarm limit via the Programming menu of
MX43.
Parameters of Detector alarms
It is possible to program the following for each detector:
■ 3 alarm thresholds.
■ Each value is configurable in increasing or decreasing values.
■ Each alarm is configurable as an instantaneous and/or average alarm of
15 to 480 minutes.
■ Each alarm has an adjustable lag of 0 to +3% (or -3% for a negative alarm)
for the value of the range of measurement, by pitch steps of 1%.
■ A high-range excess alarm (OVS: over scale).
■ A UDS low-range excess alarm (UDS: underscale).
■ A “clear doubt” alarm (in the case of explosive gas detectors).
The alarms may be programmed for automatic or manual release (except
OVS, UDS, and clear doubt).
Automatic deletion of alarms
The release (resetting) of alarms does not require any intervention. The
management of alarms (relays, indicators, buzzer) is carried out according to
the following table:
Event Message
screen
Alarm relay
(normal)
Alarm
Relay
(buzzer)
LED alarm Internal
buzzer
Appearance AL (1,2,3)
and inverse
video of the
detector
Activated Activated Fixed light: Activated
Press alarm
reset
AL (1,2,3)
and inverse
video of the
detector
Activated Deactivated Fixed light: Deactivated
Disappearan
ce
Normal
display
Deactivated Deactivated Off: (a)
(a): Manual release compulsory to stop the internal buzzer.
(b): Automatic deactivation upon the disappearance of an alarm, even if no release has been
requested before the disappearance of the alarm.
(c): If programmed
Table 2: Automatic deletion of alarms.
Manual deletion of alarms
Release (resetting) by the operator is compulsory. The management of alarms