Position Sensitive Interstitial Sensor

The Position Sensitive Interstitial Sensor detects the presence of liquid in small containment areas of double wall steel tanks. In addition, it provides an alarm when the sensor is not positioned correctly on the bottom of the interstitial space.

Meet regulations for position sensing and liquid detection

The Veeder-Root Position Sensitive Interstitial Sensor for Steel Tanks is designed specifically to meet regulations requiring position sensing and liquid detection technology.  
The Position Sensitive Interstitial Sensor triggers an alarm when sensor is improperly positioned or when liquid activates the float.

Product Form

Part Number





Position Sensitive Interstitial Sensor for Steel Tanks



2” (50mm) Interstitial sensor riser cap kit (sold separately



Key Features

  • Compatible with existing Veeder-Root TLS monitoring systems with interstitial monitoring capability

  • Detects the presence of liquid in the interstice of the double-wall tank

  • Activates visual and audible alarms on the TLS monitoring system

  • User-defined labeling for installation location identification 

  • Alarm history retrieval via printer, serial commands or graphical user interface

  • Improves annual inspection time

  • UL and cUL listed

  • National Work Group listed

  • Meets North Carolina UST Steel Tank regulation 15A NCAC 02N.0901


Fuel Compatibility

Gas, Diesel, Kerosene, Jet Fuel, Aviation Gas, E15, E85, E100, Bio-Diesel 20, Bio-Diesel 100, Green Diesel, Waste Oil, Motor Oil

Alarm Notification

Normal: Sensor in Normal State – No liquid detected

Fuel Alarm: Not sitting correctly on bottom of interstitial space or liquid detected

Sensor Out: Sensor not communicating to ATG Console

Operating Principle

Reed Switch /Float

Product Activation Height

1.4” (3.6cm)

Operating Temp

-4 to +140°F (-20 to +60°C)


3.5" (8.9cm) High, 1.75" (4.4cm) Diameter

Standard Cable

20ft (6.09m)