RKI Instruments 65-2340RKSS - Manual (Page 19)

65-2340RKSS Toxic Gas Transmitter • 15
For example, with a calibrating sample of .50 ppm and a fullscale setting of
1.00, the correct output is 300 mV.
300(mV) = (.50/1.00) X 400 +100
NOTE: Calibrating the toxic gas transmitter may cause alarms. Be sure to put the
controller into its calibration program or disable external alarms before
continuing.
6. Unscrew the splashguard from the detector housing cap. Make sure the cap remains
securely screwed onto the housing body.
7. Push the calibration cup onto the plug-in sensor that sticks through the housing cap.
The calibration cup seals to the sensor with an O-ring.
Setting the Zero (Fresh Air) Reading
NOTE: If you can verify that the toxic gas 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. Make sure to
connect the tube to the inlet side of the calibration cup if using the 81-1138RK
calibration cup which is marked on the outside bottom to show the required flow
direction through the 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 100 mV (±2 mV). If
necessary, use the zero pot on the amplifier to adjust the reading to 100 mV (±2 mV).
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 toxic gas cylinder. If necessary to
fit the calibration toxic gas cylinder, change the regulator.
Setting the Span (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 calibration gas to flow for two minutes and verify that the reading matches
the response reading (±2 mV) 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 and gently pull the calibration
cup off of the plug-in sensor.