Discriminating Interstitial


Discriminating Interstitial

The DIS installs in the interstitial space of steel and fiberglass double wall tanks and sumps and detects the presence of various liquids in tanks as well as sumps and other locations.

Sensors EVO Highlight Intro.psd

Discriminating Interstitial Sensor

  • Uses light beam traveling through probe to determine
    if sensor is wet.
  • Microprocessor inside sensor interprets readings and
    communicates data to the EVO™ Series ATG.
  • Fail-safe digital communications with built-in alarm if
    sensor malfunctions.
  • Alarms indicate petroleum present, water present, and
    sensor malfunction.
  • Each DIS comes with 25' (7.6 m) of oil-resistant cable. For fiberglass tanks, the DIS is pulled into the interstitial space using a “fish” string or wire. For steel interstitial tanks, the DIS is lowered directly to the bottom of the interstitial space through a 2" NPT fitting provided for that purpose on the tank. Optional installation kits are available which include a riser cap and other parts required to complete installation.

No matter what the monitoring application is, Franklin Fueling Systems offers a sensor solution tailored to the specific requirements of each application.

Let us help you choose the right sensor for your application.

Sensor Selection Wide Short.psd


  • For dry tank interstitial monitoring.


  • UL listed.
  • ATEX approved.
  • IECEx approved.
Model Number Description
FMP-DIS-U Discriminating interstitial sensor (EVO™ 200, EVO™ 400, EVO™ 600 and EVO™ 6000)
FMP-DIS Discriminating interstitial sensor (EVO™ 550, EVO™ 5000 EVO™ 600 and EVO™ 6000)
TSP-KI2 Interstitial sensor riser cap kit for 2" riser pipes
TSP-KW4 Interstitial sensor riser cap kit for 4" riser pipes
  • Note: The FMP-DIS wires to the 3 wire sensor module and the FMP-DIS-U wires to the probe module.