9
CALiBrAtiOn PrOCeDUre
Do not use inert gases to zero the monitor. This will cause premature failure of the sensor.
CO Monitor Zero Adjustment
To zero the monitor, follow the steps below. Zero calibration gas should be used to properly “zero” the monitor
and assure that a valid calibration is achieved. If zero adjustment cannot be made as indicated, sensor replacement may
be necessary.
After each monitor adjustment outlined in the steps, allow time for the
changes to stabilize.
SteP 1)
Place the “ON/OFF/TEST” switch in the “ON” position.
SteP 8)
Allow digital readout to stabilize approximately 15-30
seconds.
SteP 10)
Turn the regulator off and disconnect the regulator from
the zero gas cylinder.
SteP 2)
Allow 30 seconds for the readout to stabilize. The green
indicator will illuminate.
SteP 3)
Hold the “ON/OFF/TEST” switch in the “TEST” position.
The following will occur:
Audible alarm will sound
Green LED will fl ash
Amber Low Battery indicator on monitor will
illuminate
Red LED will be on
This test ensures the circuitry is operable and continuity
to the sensor is proper. Release the switch.
SteP 4)
Remove the air sample inlet tube.
SteP 5)
Install regulator on the zero air cylinder reference gas.
SteP 7)
Attach the clear tubing with the male plug to the air sam-
ple inlet on the monitor.
SteP 6)
Turn the knob on the regulator counterclockwise to allow
the fl ow of gas thru the hose. Verify fl ow of gas thru the
hose via touch or sound.
SteP 9)
Adjust the “zero” adjustment screw (clockwise to increase
or counterclockwise to decrease) until a reading of “00” is
obtained.
Calibration Procedure
