Electro-Optic Interstitial Sensor (EIS)

The electro-optic interstitial sensor (EIS) may be used with all EVO™ Series fuel management system ATGs. Utilizing electro-optic technology and made of chemically-resistant polysulfone plastic, the EIS may be installed in sumps, double wall tanks or other locations where the presence of liquid indicates a leak has occurred.

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  • Highlights

    • Highly accurate electro-optic technology and closed output circuit ensures that leaks are detected.
    • Chemical-resistant materials.
    • Can be installed in fiberglass or steel double wall tanks.
    • Utilizes light emitting diodes and prisms to indicate if a leak has occurred.
  • Specs


    • UL listed.
    • ATEX approved.
    • IECEx approved.


    For dry tank interstitial monitoring.


    Each EIS comes with 25' of oil-resistant cable. For fiberglass tanks, the EIS is pulled into the interstitial space using a “fish” string or wire. For steel interstitial tanks, the EIS 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.

  • Order Info

    FMP-EISElectro-optic interstitial sensor(EVO 550 and EVO 5000)
    FMP-EIS-UElectro-optic interstitial sensor (EVO 200 & EVO 400)
    TSP-K12Interstitial sensor riser cap kit for 2" riser pipes
    • Note: Thie EIS and the EIS-U communicates with the ATG using 3 wires and 2 wires, respectively.
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