ENMET OMNI-4000 - Manual (Page 14)

ENMET Corporation OMNI-4000 S/N 6705 and above
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1.7.1 Gas Alarms
According to the programming and the type of gas, the gas alarms can be triggered when a value is exceeded:
• Instantaneous value, on all four channels
• Both deficiency and enrichment values on an oxygen channel
• Short Term Exposure Limit (STEL), corresponding to a sliding mean over 15 minutes, for each channel with a toxic
sensor installed
• Time Weighted Average (TWA), corresponding to a sliding mean over 8 hours, for each channel with a toxic sensor
installed
As soon as at least one channel exceeds one of these preset alarm thresholds, the OMNI-4000 emits a shrill intermittent
audible signal, and the general alarm lights blinks. At the same time, the indicator lamp for the involved channel blinks and
an alarm message appears on the display (ALARM, TWA, STEL, Min, etc.), alternately with the readings in the active
quadrants.
Figure 1-9: Examples of FAULT and a TWA Alarm Display
1.7.2 Fault Alarms
There are two categories of faults:
• Those concerning the sensors (Over Range, Sensor used, New calibration requested - after a major divergence
during the self-adjustment). These generate individual messages which are displayed in the appropriate
quadrant of the display, as well as visual and audible alarm signals. See Figure 1-10, top.
• Faults affecting the device itself, such as low batteries or an electronic failure. The corresponding fault message
appears on the display. It has priority over all other messages concerning the sensors. See Figure 1-10, bottom.
Figure 1-10: Examples Of Fault Information.
FAULT TWA AL
0.0 ppm 20.9
OUT.RNAGE FAULT
0.0 NO2 20.9 O2
Recharge
Battery