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Sensor Over Range
•
Sensor over range occurs whenever the detected gas
concentration level is higher than the full scale value of the
sensor.
•
When an over range condition occurs, the LCD displays
"OVRRANGE" and the buzzer sounds for 50 milliseconds, once
every 10 minutes.
•
The LED blinks once per second normally but twice per second
during an over range condition.
•
When the gas concentration falls back within the full scale range
of the cell, the the buzzer is silenced and the LCD displays the
current concentration.
•
After an over range occurrence, the LCD will display an asterisk
appended after the concentration level in this form:
xxxPPM
where "xxx" is the current gas level. For combustible and
oxygen sensors, this will appear as "xx.x%*", where "xx.x" is
the percent of full scale.
•
To clear the appended asterisk from the display, press the ESC
key for 8 seconds.
NOTE: If the system has experienced an over range condition, the sensor
should be bump tested to verify that it still responds to the presence of
gas. It also should be recalibrated at the next maintenance interval. See
Periodic Inspection and
E
Point Standalone Gas Monitor User Manual
3
*
Maintenance.
Specifications
35
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