ENMET MX-2100 - Manual (Page 11)

MX2100 ENMET Corporation
9
3.5.2 Fault Alarms
Faults can be classified into two categories:
• Faults concerning sensors: out of range, worn sensor, request for calibration in case of a major deviation during auto-
adjustment. These faults generate individual messages shown on the relevant quadrant of the display, a visual alarm and a
continuous audio alarm.
• Faults concerning the instrument itself (discharged batteries or electronic fault). The corresponding fault message appears at
the bottom of the display. It takes priority over all other messages concerning the sensors.
Table 1: Examples of Fault Alarms
Low Battery • The batteries must be charged.
• The remaining battery life is about 20 minutes after which the instrument will
automatically shut down.
• This alarm cannot be acknowledged, only the audio signal can be cancelled.
" > 100% LEL:
outside range" • This can only occur on the combustible channel.
The display in the quadrant concerned is frozen,
It is impossible to acknowledge the continuous audio signal,
The general alarm indicator lights come on in steady mode.
• Normal operating conditions can be restored by stopping
and restarting the MX-2100, in a clean environment.
• This occurs when the level of combustible gas exceeds 100%LEL. Extreme care must
be taken. Follow appropriate safety precautions under these conditions.
"Outside range" • Readings are more then 20% of scale in a negative direction,
• Readings are more then 120% for toxic gas and oxygen.
"New calibration" • Automatic adjustment of the zero is impossible owing to, for example, excessive
deviation of the zero on the sensor.
• Replace the sensor concerned.
3.5.3 Acknowledging Alarms
Acknowledging Gas Alarms:
This does not cancel the gas alarm but only the audio signal. When the Audio switch is pressed:
The fast audio alarm is stopped but the alarm indicator light continues flashing until the measurement is lower than the
programmed alarm threshold. The visual signal is automatically disappears as soon as the measurement returns within the
defined limits.
A function to re-activate the audio alarm, if the alarm condition persists for a given time, is available with COM2100 software.
Acknowledging Fault Alarms:
It is impossible to acknowledge a fault alarm.
Fault alarms are cleared automatically as soon as the fault has disappeared.