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5.11 Interstitial Hydrocarbon Liquid Sensor with
Water Indicator
Part No. 30-0234-HW-01
The Interstitial Hydrocarbon Liquid/Water Sensor (Figure 5-11)
is designed for use in the interstitial area of a fiberglass double-walled
tank. The hydrocarbon liquid/water sensor contains a carbon/polymer
material that changes its resistance when exposed to liquid
hydrocarbons. Additionally, it contains a conductive strip to detect the
presence of water, providing the ability to discriminate between
hydrocarbon liquid and water. In the event of a break in the cable, the
system will activate the alarm.
*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.
Figure 5-11 Interstitial
Hydrocarbon Liquid
Sensor with Water
Indicator
Interstitial Hydrocarbon Liquid/Water Sensor Specifications
Detects:
Liquid hydrocarbons/water
Operating Temperature:
-40°F to 158°F (-40°C to +70°C)
Dimensions:
Length: 13.8” (35 cm), Width: 1.0” (2.5 cm)
Nominal Resistance:
Uncontaminated: 1000-3000 ohms
Contaminated: 10,000-200,000 ohms
Cable Requirements:
Belden #88760 or Alpha #55371
Maximum Wiring Length*:
1,000’ (305 m) field wiring
Multi-Drop Restriction:
16 per I.S. barrier channel 64 per barrier)
Connections
Red = Power, Black = Signal, Shield: = Ground