RKI Instruments 35-3010RK-07 - Manual (Page 26)

22 • 35-3010RK-07 Sample-Draw Detector
Setting the Fresh Air Reading
CAUTION: This procedure may cause alarms at the controller. Take appropriate action to avoid
this, such as entering the calibration mode at the controller.
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.
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.