10
CALiBrAtiOn PrOCeDUre
CO Monitor Span Adjustment
Use only 10-20ppm CO gas for calibration. Using a higher concentration may decrease accuracy at lower scale readings.
Note: 10ppm gas must be used to satisfy Canadian calibration requirements.
SteP 1)
Install regulator on the CO calibration gas cylinder.
SteP 3)
Connect the plug to the air sample inlet on the monitor.
SteP 2)
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 4)
Allow digital readout to stabilize 15-30 seconds.
SteP 5)
Adjust the “span” adjustment screw (clockwise to in-
crease or counterclockwise to decrease) until the digital
readout reads the same as the concentration (ppm) as
printed on the calibration gas cylinder.
SteP 6)
Turn the regulator off and repeat the “zero” adjustment
procedure. The digital readout should return to a “00”
reading.
The monitor is now calibrated and should be
recalibrated monthly or if accuracy is question-
able. Check local requirements and recalibrate
as required.
Calibration Procedure
