RKI Instruments 35-3010RK-03 - Manual (Page 23)

35-3010RK-03 Sample-Draw Detector • 19
9. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator.
Setting the Response Reading
1. Screw the regulator into the 4-gas calibration cylinder.
2. Connect the sample tubing to the regulator.
3. Follow the directions in the controller’s operator’s manual for setting the response
reading for the LEL 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 calibration gas to flow for 1 minute.
6. Set the response reading according to the controller operator’s manual to match the
calibration gas concentration.
7. Disconnect the sample tubing from the inlet line.
8. Unscrew the regulator from the calibration cylinder.
NOTE: For convenience, leave the regulator connected to the sample tubing.
Returning to Normal Operation
1. Remove the voltmeter leads from the test points.
2. Reconnect the incoming sample line.
3. Wait 1 to 2 minutes to allow the calibration gas to be drawn out and the reading to
stabilize.
4. Close the housing door.
5. 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 fresh air reading, set the zero 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 to set the zero reading. A 3-
gas cylinder is used to set the zero since it is already used to calibrate the LEL
and oxygen channels. A 100% nitrogen calibration cylinder could also be used to
set the zero reading.
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.