Dover OPW SiteSentinel iSite - 6 Leak Detection; 6.1 Volumetric Line Leak Detector (VLLD) Sensor; 6.1.1 Prior to Installation

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6 Leak Detection
6.1 Volumetric Line Leak Detector (VLLD) Sensor
Part No. 30-3251
Designed to detect a leak in pressurized product piping by monitoring
flow when the submersible pump is running and no one is dispensing
fuel. The sensor (Figure 6-1) utilizes an internal flow meter to detect
and measure flow and provides an alarm condition if a leak is
detected. An alarm condition will also occur if the cable is broken. The
use of this sensor requires the addition of an external Line Interface
Module (LIM) for each four (4) lines.
*Maximum Wiring Length is the maximum length of cable to be used
to connect all sensors on an individual channel. The length includes
run of cable from VSmart to each sensor board in the string.
Figure 6-1 VLLD Sensor
6.1.1 Prior to Installation
• Lock-out and tag-out the STP breaker.
• Completely barricade your work area.
• Adhere to OSHA Confined-Space Entry (CSE) protocol.
• Depressurize the product line.
• Keep plenty of fuel-absorbent material in the sump
surrounding area.
LLD sensors may be multi-dropped (maximum three (3) LLD
sensors). Cannot be multi-dropped with OPW probes/sensors on
same I.S. channel.
Volumetric Line Leak Detector Sensor
Primary Use:
Pressurized Product Lines
Location:
Submersible Pump Leak Detector Port
Alternate Location:
Sensor Adaptor Fitting
Detects:
Product Flow
Operating Temperature:
-40°F to 158°F (-40°C to +70°C)
Connections:
Blue = Power; Brown = Signal, Black and Shield
= Ground
Multi-Drop Restriction:
3 per I.S. barrier channel (16 per barrier)
Maximum Wiring Length*:
1,000’ (305 m) field wiring
Wiring Requirement:
Belden #88760 or Alpha #55371