RKI Instruments 35-3010RK-06-02 - Manual (Page 25)

35-3010RK-06-02 Sample-Draw Detector • 21
NOTE: For convenience, leave the regulator attached to the sample tubing.
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, Oxygen Detector
This section describes how to calibrate the oxygen detector in the sample-draw detector. It
includes procedures to set the zero reading, set the fresh air reading, and return to normal
operation.
NOTE: This procedure describes calibration using a demand flow regulator and a 3-gas
calibration cylinder to set the zero reading. A 3-gas cylinder is used to set the
zero since it is already used to calibrate the CO and IR CO
2
channels. A 100%
nitrogen calibration cylinder could also be used to set the zero reading.
Setting the Fresh Air Reading
CAUTION: This procedure may cause alarms at the monitoring device. Take appropriate action
to avoid this, such as entering the calibration mode at the monitoring device.
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.
Setting the Zero Reading
NOTE: The 3-gas calibration cylinder included in the calibration kit may be used to zero
the oxygen channel. Keep in mind that the oxygen concentration in that cylinder
is 12%, not 0%. Be sure to set the controller appropriately.
1. Screw the regulator into the 3-gas calibration cylinder.
2. Connect the calibration kit sample tubing to the regulator.