PureAire Monitoring Systems, Inc.
15
Items to check
Check for power and proper operation
Condition / status when
operating properly
Unit should be outputting approximately 4.6 mA
signal when the carbon dioxide is at ambient
400ppm. The LCD digital display should also
indicate approximately 405 ppm level when the
carbon dioxide level is at ambient.
4.3.2 Recommended Routine Maintenance Schedule
Routine Visual Checks
Every 6 - 12 months
Sensor Verification with nitrogen
Every 6 - 12 months**
The ambient CO
2
level is 400ppm and the sensor provides automatic baseline adjustments to ambient
levels on a regular time schedule. However, the CO
2
sensor can be manually calibrated by using span
gas. See section 6.3 for how to manually calibrate the CO
2
sensor.
4.4 Loss of Power Indicator
In the event the
CO
2
monitor loses 24VDC power, the 4-20 mA analog output signal drops to 0mA.
The LCD display will also display a blank screen.
4.5 Alarm Reset
It the
CO
2
monitor is supplied with individual alarm relays. Whenever the monitor’s alarms are
activated, the built-in alarm relays, panel mounted LED’s and audio horn will also activate. When the
relay settings are non-latching, the alarm relays, LEDs, and horn will automatically reset. If the relay
settings are latching, then a manual reset of the alarms are required. Resetting the alarms can be
performed through use of the joystick or using the remote reset function.
Joystick – You must enter the password
557,
to enter the reset function. After the password is
entered and accepted, push the joystick in; (enter) to reset the alarms.
Remote Reset – See section1.2.7. The alarm relay board has a two-pin connector for wiring to a
remote switch. When connected to a switch, this remote reset will bypass the joystick and a password
will not be needed to reset the alarms.
NOTE
:
The carbon dioxide levels must recover above the alarm thresholds before the horn can
be reset from the remote reset switch or joystick.
