OPW M2010-EU, Installation Manual

Page: 68 / 149

9.5 Discriminating Interstitial Sensor (Optical)
Smart Sensor Equipped with Intellisense™ Technology
30-0236-LW
Description
The primary function of the Discriminating Interstitial Optical Liquid Sensor is to monitor the interstitial area of
double-walled tanks. This sensor uses a long-life, solid-state optical prism. These sensors can also be used
in sumps, fuel dispenser pans and other locations where there is liquid that could indicate that a leak has
occurred.
The sensor can tell the difference between water and hydrocarbons and will cause an alarm condition when
it senses a liquid. If there is a break in the cable it will cause an alarm condition in the system.
Specifications
Primary Use:
Liquid detection in the interstitial space of double-walled
tanks.
Alternate Use(s): Fuel Dispenser Pans and STP Sumps
Detects: Liquids: Hydrocarbon and Water
Operating Temperature: -40°C to +70°C (-40°F to 158°F)
Dimensions: 0.7 inches (1.8cm) x 2.8 inches (7cm)
Nominal resistance (uncontaminated) Less than 5,000 ohms
Nominal resistance (contaminated) More than 30,000 ohms
Cable:
Belden #88760 or Alpha #55371
4.5 m (15 feet) of gas & oil resistant cable to the inline
ISIM + 1.3 m (4 feet) ISIM tail
Maximum Wiring Length*: 305 m (1,000 ft.) field wiring
Alarm Threshold Configuration: Fully Automatic
Doc. No.: M2010-EU Rev.: 13
Page 68 of 149