RKI Instruments 65-2320RK-100 - Manual (Page 16)

12 • 65-2320RK-100 Oxygen Transmitter
5. Use the following formula to determine the correct test points output for the
calibrating sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
The concentration of oxygen in the atmosphere is 20.9%, so when setting the fresh air
reading, you will set the test points output to 184 mV (±2 mV).
184(mV) = (20.9/100) X 400 +100
NOTE: Calibrating the oxygen transmitter may cause alarms. Be sure to put the
controller into its calibration program or disable external alarms before
continuing.
6. Screw the calibration cup onto the detector housing.
Setting the Fresh Air Reading
NOTE: If you can verify that the oxygen transmitter is in a fresh air environment, you do
not need to apply zero air to the detector before adjusting the fresh air reading.
1. Screw the regulator into the zero air calibration cylinder.
2. Use the sample tubing to connect the regulator to the calibration cup.
3. Turn the regulator knob counterclockwise to open the regulator.
4. Allow the gas to flow for two minutes and verify a reading of 184 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.
NOTE: For convenience, leave the regulator and calibration cup connected by the
sample tubing.