OPW M2010-EU, Installation Manual

Page: 62 / 149

9.4 Discriminating Dispenser Sump/STP Sump Sensor
Smart Sensor Equipped with Intellisense™ Technology
30-0232-DH-10 & 30-0232-DH-20
Description
IMPORTANT:
This float body is the same as the 30-0232-D10 / D20 and 30-0232-D-10B / D-
20B. Look at the label to make sure you have the correct sensor for the applicable function.
The primary function of the Discriminating Dispenser Sump/STP Sump Sensor is to sense liquid
hydrocarbons and water in sumps, fuel dispenser pans and other locations where there is liquid that could
indicate that a leak has occurred. Use the DH-10 on fuel dispenser pans and transition sumps. Use the DH-
20 in tank sumps.
The sensor has a strip made of a carbon/polymer material that changes its electrical resistance when it is
touched by liquid hydrocarbons.
Sensor with Carbon/polymer Strip
Two (2) float switches are used in the body of the sensor to sense low and high liquid levels. If there is a
break in the cable it will cause an alarm condition in the system.
Doc. No.: M2010-EU Rev.: 13
Page 62 of 149