RKI Instruments 35-3000RK-LEL/O - Manual (Page 21)

35-3000RK-LEL/O Sample-Draw Detector • 17
Returning to Normal Operation
1. Reconnect the incoming sample line.
2. Wait approximately one minute to allow the combustible gas reading to stabilize.
3. Follow the instructions in the controller’s operator’s manual to exit the calibration
mode.
4. Store the components of the calibration kit in a safe and convenient place.
Calibration, Oxygen Sensor
This section describes how to calibrate the oxygen sensor in the sample-draw detector. It
includes procedures to prepare for calibration, 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 demand flow regulator.
Preparing for Calibration
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. Follow the instructions in the controller’s operator’s manual for entering calibration
mode.
2. Screw the regulator into the zero air calibration cylinder.
Setting the Fresh Air Reading
1. Connect the sample tubing from the demand flow regulator to the sample-draw
detector’s inlet fitting. This step is not necessary if you verified a fresh air
environment earlier in this procedure.
2. Allow the sample draw detector to draw sample for one minute.
3. Follow the directions in the controller’s operator’s manual for setting the fresh air
reading.
4. Disconnect the sample tubing from the inlet fitting.
5. Unscrew the regulator from the zero air calibration cylinder.
Setting the Zero Reading
1. Screw the demand flow regulator onto the 100% N
2
calibration cylinder.
2. Connect the sample tubing from the regulator to the inlet line.
3. Allow the sample-draw detector to draw the calibrating sample for 1 minute.
4. Follow the directions in the controller’s operator’s manual for setting the zero
(oxygen free) reading.