34 E
3
Point Gas Monitor Technical Manual
Specications
• 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.
• On network monitors (301-C systems, for example), the over
range warning states are available through warning flag #Z when
connected to a BACnet building automation system. Over range
warning states are available through the reliability property of the
sensor analog input object (AIO).
• After an over range occurrence, the LCD will display an asterisk
appended to 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 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 should also be recalibrated at the next
maintenance interval. See Periodic Inspection and Maintenance.
To change a sensor cartridge, cut all power to the device and simply
pull out the “smart sensor” cartridge and press the replacement
cartridge into place. Be sure TOP/HAUT is toward the top of the
monitor. Once the Smart Sensor is firmly in place, reconnect power.
Use caution when pressing the Smart Sensor cartridge into place to
avoid bending the pins.
See Alarm Menu in the Using the Programming Menus, section for
special instructions for changing sensor gas types.
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