Dover OPW SiteSentinel iSite - Discriminating STP Sump Sensor; Installation

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5.8 Discriminating STP Sump Sensor
Part No. 30-0232-DH-20
The Discriminating STP Sump Sensor (Figure 5-8) detects abnormally
high or low liquid levels and distinguishes liquid type (water or
hydrocarbons) using a polymer strip and float technology. The polymer
strip will change resistance showing hydrocarbon detection; if the
polymer doesn't change resistance it indicates detection of water.
Detection of either will result in an alarm condition, as will a break in the
cable or sensor malfunction.
Discriminating STP Sump Sensor Specifications
Primary Use(s):
STP Sumps
Alternate Use(s):
Dispenser Pans/Sumps
Detects:
Low Liquid, High Liquid, Fuel
Operating Temperature:
-40°F to 158°F (-40°C to +70°C)
Sensor Dimensions:
Length: 21.1” (53.6 cm), Diameter: 2.3” (5.8 cm)
Float Requirements:
Low: 1.5” (3.8 cm), High: 11” (27.9 cm)
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
*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.
5.8.1 Installation
1. Check that the dispenser pan is dry.
2. Install the bracket with pipe clamp and sensor bracket.
3. Position the sensor to touch bottom of pan.
4. Connect the sensor cable to the sensor and field wiring.
5. Seal the electrical connections with the epoxy seal pack.
6. Remove the sensor from the sump while servicing the pump
to prevent activating the sensor with fuel.
Figure 5-8 Discriminating
STP Sump Sensor