20 • 35-3010RK-03 Sample-Draw Detector
2.
Connect the calibration kit sample tubing to the regulator.
3.
Follow the directions in the controller’s operator’s manual for setting the zero reading
for the oxygen channel.
4.
When the instructions call for applying gas to the detector, connect the sample tubing
from the regulator to the inlet line at or near the INLET fitting.
5.
Allow the gas to flow for one minute.
6.
Set the zero reading according to the controller operator’s manual.
7.
Disconnect the sample tubing from the inlet line.
8.
Unscrew the regulator from the 3-gas calibration cylinder.
9.
For convenience, leave the regulator attached to the sample tubing.
Setting the Fresh Air Reading
CAUTION:
This procedure may cause alarms at the controller. Take appropriate action to avoid
this, such as entering the calibration mode at the controller.
NOTE:
If you suspect the sampling area to not be a fresh air environment (free of
combustible or toxic gases and of normal oxygen content, 20.9%), it is necessary
to use a zero air cylinder when setting the zero reading.
1.
Open the housing door.
2.
The fresh air reading for the oxygen channel is set at the controller. See the controller
operator’s manual for instructions to set the zero reading.
3.
When the instructions call for applying gas to the detector, make sure the inlet line is
sampling fresh air.
4.
Allow the detector to sample fresh air for one minute.
5.
Set the fresh air reading according to the controller operator’s manual.
Returning to Normal Operation
1.
Reconnect the incoming sample line.
2.
Wait 1 to 2 minutes to allow the calibration gas to be drawn out and the reading to
stabilize.
3.
Close the housing door.
4.
Store the components of the calibration kit in a safe and convenient place.
Calibration, CO Detector
This section describes how to calibrate the CO detector in the sample-draw detector. It
includes procedures to prepare for calibration, set the zero reading, set the response
reading, and return to normal operation.
NOTE:
This procedure describes calibration using a demand flow regulator, a zero air
calibration cylinder, and a 3-gas calibration cylinder.
