• Cleaning the Hydrocarbon Sensor Portion. To clean hydrocarbon contamination from the sensor
from testing or actual use, immerse the contaminated portion in denatured alcohol for one hour. Then,
flush the sensor with water to remove any residue. Leave the sensor to “settle” for another hour. The
sensor should return to nearly its original resistance, but it may be necessary to readjust the
Controller’s thresholds.
1.21 30-3207 Hydrocarbon Liquid Sensor
About the 30-3207-06, -10, -15
Figure 11-3 Hydrocarbon Liquid Sensor
The hydrocarbon liquid sensors are used primarily in monitoring wells with fluctuating ground water tables. The
hydrocarbon liquid sensor contains a carbon/polymer material that changes its resistance when exposed to
liquid hydrocarbons.
This sensor can also be placed in the containment areas of tanks, pumps and pipes. It will alert the system if
any fuel enters into the containment area, which would indicate a leak. In the event of a break in the cable the
system will activate the alarm.
NOTE: To ensure safe operating conditions the sensor has been designed to connect to OPW Fuel
Management Systems’ controller only.
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