14.1.7 SiteSentinel iTouch Controller Setup for Hydrocarbon Vapor Sensor
1. Configure the barrier position to be a generic sensor (or, if using SiteConnect choose the appropriate
icon) and install that position.
2. Using the Controller take a dynamic reading of the hydrocarbon portion of the sensor.
3. Set the lower alarm threshold to be 0.1 volts lower than the reading taken (this assumes that there is
no current hydrocarbon contamination)
4. Set the upper alarm threshold to be 5.0 volts (disables upper threshold).
5. Program your alarms to activate if the sensor detects hydrocarbons.
14.1.8 Testing and Decontaminating the Hydrocarbon Vapor Sensor
To prevent the possibility of explosion or fire, do not test the sensor in the
Hazardous Area.
Work in a well-ventilated area with no hot surfaces or open flames.
Do not use fuel to test the sensor!
To test the hydrocarbon vapor sensor:
1. Pour some mineral spirits into an empty can or other container.
2. Suspend the hydrocarbon sensor inside the container, in the air above the mineral spirits.
3. Wait approximately 10 minutes. After ten minutes, any Controller alarms or events associated with the
sensor should have triggered.
To clean the sensor from hydrocarbon contamination (or after testing):
1. Immerse the sensor in denatured alcohol.
2. Let the sensor soak for one hour.
3. Remove the sensor from the alcohol and let stand for one hour before using.
The sensor should have returned to nearly its original resistance, but it may be necessary to re-adjust the
Controller’s thresholds. If the Controller fails to register the alarm condition, check your programmed thresholds
in the Controller. Disconnecting the sensor should trigger an alarm and shorting the sensor should be out of
alarm. Check all wiring and junction boxes to ensuring continuity without shorts.
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