RKI Instruments 65-2515RK - Manual (Page 14)

10 • 65-2515RK Oxygen Detector
Calibration
This section describes how to calibrate the oxygen detector. It includes procedures to
prepare for calibration, set the fresh air reading, set the zero reading, and return to normal
operation. It describes calibration using a calibration kit that includes a calibration cup,
calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI
Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator.
WARNING: The controller is not an active gas monitoring device during the calibration
procedure.
Preparing for Calibration
NOTE: Calibrating the oxygen transmitter may cause alarms. Be sure to put the
controller into its calibration program or disable external alarms before
calibrating.
1. Screw the calibration cup onto the bottom of the oxygen detector.
2. Screw the regulator into the zero air calibration cylinder.
3. Use the sample tubing to connect the regulator to the calibration cup.
NOTE: If you can verify that the oxygen detector is in a fresh air environment, you do
not need to apply zero air to the detector before adjusting the zero reading.
4. Put the controller into its calibration program.
Setting the Fresh Air Reading
1. Follow the directions in the controller operator’s manual for setting the fresh air
reading.
2. When the instructions call for applying zero air to the detector, turn the regulator’s
on/off knob counterclockwise to open it. Zero air will begin to flow.
3. Allow the gas to flow for two minutes.
4. Set the fresh air reading according to the controller operator’s manual.
5. Turn the regulator’s on/off knob clockwise to close it.
6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator and the calibration cup.
Setting the Zero Reading
1. Screw the regulator into the calibration gas cylinder, normally 100% nitrogen.
2. Follow the instructions in the controller’s operator’s manual for setting the oxygen
zero reading.
3. When the instructions call for exposing the detector to gas, normally 100% nitrogen,
turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow.
4. Allow gas to flow to the detector for two minutes.
5. Set the zero reading according to the controller operator’s manual.
6. Turn the regulator’s on/off knob clockwise to close it.