RKI Instruments 65-2485RK-02 - Manual (Page 23)

65-2485RK-02 Multi Point Detector • 19
Preparing for Calibration
WARNING: Do not remove the junction box cover or detector housing cap while the
circuits are energized unless the area is determined to be non-hazardous.
Keep the junction box cover and detector housing cap tightly closed during
operation.
1. Screw the calibration cup onto the bottom of the oxygen detector.
2. Screw the regulator into the zero air calibration cylinder. Make sure the regulator is
off. It is off when the on/off knob is turned all the way clockwise.
NOTE If you can verify that the multi-point detector is in a fresh air environment, you
do not need to apply zero air to the detector before adjusting the fresh air
reading.
3. Use the calibration kit sample tubing to connect the fixed flow regulator to the
calibration cup.
4. Put the controller into its calibration program. See the controller operator’s manual
for instructions to enter the calibration program.
NOTE: RKI controllers have a peak hold feature for fresh air adjustment and a minimum
hold feature for zero adjustment. Because of this, the instructions call for turning
off the gas to a detector before making adjustments.
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. Gas will begin to flow.
3. Allow the gas to flow for two minutes.
4. Turn the regulator’s on/off knob clockwise to close it.
5. Set the fresh air reading according to the controller operator’s manual.
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 100% nitrogen calibration gas cylinder. Make sure the
regulator is off. It is off when the on/off knob is turned all the way clockwise.
2. Follow the directions in the controller operator’s manual for setting the zero reading.
3. When the directions call for exposing the detector to gas, turn the regulator’s on/off
knob counterclockwise to open it. Gas will begin to flow.
4. Allow gas to flow for 2 minutes before continuing with the directions.
5. Turn the regulator’s on/off knob clockwise to close it.
6. Set the zero reading according to the controller operator’s manual.
7. Unscrew the regulator from the cylinder.