RKI Instruments 35-3000RK-OXY - Manual (Page 17)

35-3000RK-OXY Sample-Draw Oxygen Detector • 17
Calibration
This section describes how to calibrate the sample-draw oxygen detector. It includes
procedures to assemble the calibration kit, set the fresh air reading, set the zero reading,
and return to normal operation.
NOTE: Calibrating the sample draw detector may cause alarms. Be sure to put the
controller into its calibration program or disable external alarms before
continuing.
NOTE: This procedure describes calibration using a gas collection bag. A demand-flow
calibration kit is also available for calibrating the sample-draw detector.
Assembling the Calibration Kit
NOTE: If you can verify a fresh air environment, it is not necessary to use a zero air
calibrating sample to set the fresh air reading at the controller.
1. Screw the dispensing valve onto the zero air calibration cylinder.
2. Connect the calibration kit sample tubing to the fitting on the gas collection bag.
3. Disconnect the incoming sample line from the sample-draw detector’s inlet fitting,
then connect the sample tubing from the gas collection bag to the inlet fitting.
Allow the sample-draw pump to draw out any residual gas in the gas collection bag.
4. Close the tubing clamp. The tubing clamp is attached to the calibration kit sample
tubing.
5. Disconnect the calibration kit sample tubing from the inlet fitting.
6. Connect the tubing from the gas collection bag to the dispensing valve, then open the
clamp.
7. Open the dispensing valve. The gas collection bag begins to fill.
8. Close the dispensing valve when the gas collection bag appears full.
9. Close the tubing clamp, then disconnect the sample tubing from the dispensing valve.
Setting the Fresh Air Reading
1. Open the clamp, then connect the sample tubing from the gas collection bag to the
sample-draw detector’s inlet fitting.
2. Allow the sample draw detector to draw sample for one minute.
3. Follow the directions in the controller’s instruction manual for setting the fresh air
reading.
4. Allow the sample-draw detector to draw out any residual gas in the gas collection
bag.
5. Disconnect the gas bag sample tubing from the inlet fitting, then close the tubing
clamp.
6. Unscrew the dispensing valve from the zero air calibration cylinder.