RKI Instruments 65-2336RKSS User Manual
Page 19
65-2336RKSS CO Transmitter • 15
calibrating sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a calibrating sample of 50 ppm CO and a fullscale setting of
300 ppm, the correct output is 167 mV.
167 (mV) = (50/300) X 400 +100
5.
Screw the calibration cup onto the detector housing.
Setting the Zero Reading
NOTE
If you can verify that the CO transmitter is in a fresh air environment, you do not
need to apply zero air to the detector before adjusting the zero 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, then verify a reading of 100 mV (± 2mV). If
necessary, use the zero pot on the amplifier to adjust the reading to 100 mV (± 2mV).
5.
Unscrew the regulator from the zero air calibration cylinder.
6.
Leave the sample tubing connected to the regulator and the calibration cup.
Setting the Response Reading
1.
Screw the regulator into the calibration cylinder. Verify that the calibration gas is
representative of the transmitter’s target gas.
2.
Turn the regulator knob counterclockwise to open the regulator.
3.
Allow the gas to flow for two minutes, then verify that the reading matches the
response reading (± 2mV) you determined earlier. If necessary, use the span 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.
Returning to Normal Operation
1.
Remove the voltmeter leads from the amplifier test points.
2.
Unscrew the calibration cup from the detector.
NOTE:
For convenience, leave the components of the calibration kit connected by the
sample tubing.
3.
Secure the junction box cover to the junction box.
4.
When the display reading falls below the alarm setpoints, return the controller to
normal operation.
5.
Verify that the controller display reading decreases and stabilizes at 0 ppm.
6.
Store the components of the calibration kit in a safe and convenient place.