RKI Instruments 65-2321RK - Manual (Page 18)

14 • 65-2321RK Oxygen Transmitter
3. Turn the regulator knob counterclockwise to open the regulator.
4. Allow the gas to flow for two minutes and verify a reading of 434 mV (±2 mV). If
necessary, use the span pot on the amplifier to adjust the reading to the correct value.
5. Turn the regulator knob clockwise to close the regulator.
6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator and the calibration cup.
NOTE: Depending on the size of your zero air cylinder, it is possible that you will have a
different regulator for the zero air cylinder and the 100% nitrogen cylinder. If
necessary to fit the nitrogen cylinder, change the regulator.
Setting the Zero Reading
1. Screw the regulator into the 100% nitrogen calibration cylinder.
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the calibration gas to flow for two minutes and verify a reading of 100 mV (±2
mV). If necessary, use the zero pot on the amplifier to adjust the reading to match the
correct response reading.
4. Turn the regulator knob clockwise to close the regulator.
5. Unscrew the regulator from the calibration cylinder.
6. Unscrew the calibration cup from the detector housing cap.
NOTE: For convenience, leave the regulator and calibration cup connected by the
sample tubing.
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Secure the junction box cover to the junction box.
3. When the controller display reading rises above the decreasing alarm setpoint, return
the controller to normal operation.
NOTE: If you do not allow the gas reading to increase above the decreasing alarm point,
then unwanted alarms may occur.
4. Verify that the controller display reading increases and stabilizes at 20.9% volume.
5. Store the components of the calibration kit in a safe and convenient place.