RKI Instruments 35-3010RK-07 - Manual (Page 25)

35-3010RK-07 Sample-Draw Detector • 21
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 readings 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, a zero air
calibration cylinder, and a 4-gas calibration cylinder to set the zero reading. A 4-
gas cylinder is used to set the zero since it is already used to calibrate the IR CH
4
and the H
2
S channels. A 100% nitrogen calibration cylinder could also be used to
set the zero reading.
Setting the Zero Reading
NOTE: The 4-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 4-gas calibration cylinder.
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 4-gas calibration cylinder.
9. For convenience, leave the regulator attached to the sample tubing.