20 • 65-2340RK Toxic Gas Transmitter
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. Verify that the calibration gas is representative of the transmitter’s target gas.
2. For toxic gas cylinders (like Cl
2
, NH
3
, etc.), it is important to vent the regulator while
installing it onto the cylinder. Venting the regulator during installation helps prevent air
from getting into the cylinder and degrading the gas. Open the regulator by turning the
knob counterclockwise and then install it onto the cylinder.
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.
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Gently pull the calibration cup off of the plug-in sensor
NOTE:
For convenience, leave the regulator and calibration cup connected by the sample
tubing.
3. Screw the splashguard firmly back onto the housing cap.
4. Secure the junction box cover to the junction box.
5. When the controller display reading falls below the alarm setpoints, return the controller
to normal operation.
NOTE:
If you do not allow the gas reading to decrease below the alarm points, then unwanted
alarms may occur.
6. Verify that the controller display reading decreases and stabilizes at 0 ppm.
7. Store the components of the calibration kit in a safe and convenient place.
