What Is an Interstitial Sensor?

Interstitial sensors and gauges detect leaks in the interstitial space between the walls of double-wall containment tanks. Some types of interstitial sensors alert operators of leaks as they are detected, whether in the form of a liquid or gas. Other types of sensors work by detecting changes in the condition of the tank that indicate a leak, including loss of vacuum or changes in the volume of the monitoring liquid stored in the walls.

Learn more about the benefits of interstitial sensors and the different types available.

Benefits of Interstitial Sensors & Gauges for Containment Tanks

Interstitial sensors and gauges for containment tanks deliver several benefits, including:

  • Automatic Alerts: The automatic tank gauge console presents a visible and audible alarm when the presence of gas is detected in the interstitial space of the double-walled containment tank.
  • Enables Rapid Response: The alarm alerts technicians immediately, allowing them to take fast and effective action to remedy the leak. This rapid response prevents harm to the environment and protects nearby personnel.

Types of Interstitial Sensors & Gauges for Containment Tanks

When selecting the ideal interstitial sensors or gauges for containment tanks, consider your specific type of tank and application.

Type K Leak Detection Gauge & Interstitial Sensor

Krueger Sentry’s Type K leak detection gauge is a vertical leak monitor with exceptional reliability. It is engineered to detect leaks in the interstitial or annular space of double-wall above-ground storage tanks (ASTs). The durable mechanical design of the Type K detection gauge delivers continuous service, minimal maintenance, and fast, inexpensive repairs. Our gauges can be rapidly installed in containment tanks and offer a range of customization to fit tanks from 6 to 170 inches deep.

Our precision leak detection gauges can detect the following types of media:

  • Alcohol
  • Avgas
  • Biofuels
  • Butane
  • Corn syrup
  • Ethanol
  • Hydrochloric acid
  • Naphtha-kerosene blend
  • Oil
  • Propane
  • Unleaded kerosene

Position Sensitive Interstitial Sensor

A position-sensitive interstitial sensor is positioned at the bottom of the interstitial area. If this position is not correct or changes as a result of the presence of liquid, the sensor triggers an alarm.

Non-Discriminating Interstitial Sensor

Non-discriminating interstitial sensors are designed for double-wall fiberglass tanks. They detect any liquid between the double-wall layer of the containment tank, triggering an alarm on the automatic tank gauge. The interstitial sensor alarm delivers an immediate notification to technicians, allowing them to take quick action to address leaks that can cause safety and environmental harm.

Solid-State Discriminating Interstitial Sensor

Solid-state discriminating interstitial sensors rely on solid-state technology to detect leaks and differentiate between hydrocarbons and other liquids in a fiberglass containment tank’s interstitial space. They allow technicians to quickly identify and address leaks, preventing environmental and safety concerns.

Interstitial Sensors & Gauges for Containment Tanks by Krueger

Interstitial sensors and gauges are critical in monitoring containment tanks for leaks and conditional changes, helping operators protect workers and prevent costly environmental impacts. There are several types of interstitial sensors and gauges to suit a variety of tanks and fluid types. Krueger Sentry Gauge can help you determine the ideal interstitial sensor for your containment tank, automatic tank gauge or panel, and liquid or gas being contained.

With over 75 years of industry experience, Krueger Sentry is a trusted supplier of sensors and gauges for tanks in various industries, including Type K interstitial leak detection sensors. Contact us to learn more about interstitial sensors or to speak with a specialist about our solutions for your application.


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