Alarm Reset Key (H)
Press this key to silence the on-board buzzer and reset the alarms that can be
acknowledged. This reset button can be remote, see paragraph Remote
Acknowledgement connector on page 30.
Alarm Thresholds and Relays
Alarm thresholds, relay programming, time delays setting, alarm
acknowledgement modes or the management of the additional flash and
sounder (
Figure 9: MX 32’s front platetags D and E) are configured though COM 32
application.
Note: It is possible to modify a programmed alarm level via the MX 32’s user
interface (Program menu).
Internal Relays and Buzzer
■ 4 fully configurable Alarm relays are available.
■ 1 Fault relay is available. This relay is not configurable and is activated on
the appearance of any failure. The Fault relay is powered in normal
operation mode so it does switch over in the event of a power supply
failure.
■ The internal buzzer is activated on the appearance of any event (failure or
alarm). The sound differs depending on the event: continuous in fault
mode, discontinuous in alarm mode and frequency increases according to
the alarm level that is reached. The internal buzzer can be deactivated
permanently through the user interface or COM 32 application.
Alarms Settings
It is possible to program for each detector:
■ 3 alarm levels
■ each alarm can be increasing or decreasing
■ each alarm can be configured as an instantaneous alarm and/or an
averaged alarm over 15 to 480 minutes
■ each alarm has an adjustable hysteresis from 0 to +3% of the measuring
range by increments of 1%
■ one over range alarm (OVS: over scale)
■ one under range alarm (UDS: underscale)
■ one “no ambiguity” alarm (for flammable gas detectors and concentrations
above 100% LEL)
Alarms may be programmed for automatic or manual acknowledgement
(except OVS, UDS, “no ambiguity”).
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