Contextual Keys (B)
The function of each of the 5 keys indicated in the lower part of the display
changes depending on the page displayed.
Zone Status Indicators (C)
Eight bars of 7 indicators each are displayed on the controller.
The 4 bars to the right are not operative on a 4-line MX 43.
Each bar represents a geographic area of the complete installation
and not the 4 or 8 lines of the MX 43.
Each bar displays the status of the group of detectors of the pertinent zone as
follows:
Orange indicator of high-range excess (OVS: overscale, high-range excess). This
value is adjustable up to 110% of the range.
- Off: The measurement is lower than the OVS value programmed.
- Lit: The measurement is higher than the OVS value programmed. The alarm
relays are activated in accordance with the program. In parallel, the display
indicates « > ».
OVS resetting is done manually and is only possible if the value measured drops
below the programmed value.
Management of “Clear doubt”
The Clear doubt alarm is only applicable to the detection of explosive gases in a
range of 0-100%LEL, and is subject to the decision of the operator. Upon the
detection of a concentration of gas higher than 100% LEL, the LCD indicates a
measurement blocked at 100% LEL and the message > 100% LEL. The message
Strong concentaration. Resetting by an authorized person in the maintenance
menu is displayed. The OVS and FAILURE indicators are activated. The alarm can
only be deactivated by stopping the detector via the maintenance menu once the
gas level decreases below this limit.
Red indicators of alarm status:
- Off: Measurement lower than the threshold defined.
- Solid light: at least one of the gas detectors is in alarm mode. Acknowledgment
is programmed in automatic mode or has already been requested through use of
the Alarm reset button on the front panel.
- Flashing light: at least one of the gas detectors is in alarm mode. Acknowledg-
ment is programmed in manual mode.
The alarm relays will be activated in accordance with the programming.
Orange indicator of low- range excess (UDS: Under scale, low-range excess). This
value is adjustable from 0-10% of the range.
- Off: The measurement is higher than the UDS value programmed.
- Lit: The measurement is lower than the UDS value programmed. The alarms of
the relays are activated in accordance with the programming. In parallel, the
display indicates « < ».
UDS resetting is automatic once the failure disappears.
Orange failure indicator
- Off: No failing module or detector.
- Fixed light: Communication problem with one of the modules or invalid detector
measurement, that is to say either below -10% of the range or above 110% of
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