5.9
Hydrocarbon Vapor Sensor
Part No. 30-0235-V
The Hydrocarbon Vapor Sensor (Figure 5-9) detects hydrocarbon
vapors in dry monitoring wells. The presence of these vapors could
indicate a potentially dangerous leak that could lead to safety and
environmental problems. The sensor is made from a long-life resistive
element that increases dramatically in resistance in the presence of
hydrocarbon vapors. Detection of vapors will result in an alarm condition,
as will a break in the cable or sensor malfunction.
Depending on saturation factor, the sensor may require up to 30
minutes to return to normal after vapors have dissipated.
*Maximum Wiring Length is the maximum length of cable to be used
to connect all sensors on an individual channel. This length includes
run of cable from VSmart to each sensor board in the string.
5.9.1 Installation
1. Check Dry Monitoring Wells for vapors before installing.
2. Mount Sensor close to the top above the water level, if
applicable.
3. If sensor is submerged in water it will not function.
Figure 5-9 Hydrocarbon Vapor Sensor
Uncontaminated: 3,000 - 5,000 ohms
Contaminated: 10,000 - 200,000 ohms
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