Single-Point Hydrostatic Sensor

The Single-Point Hydrostatic Reservoir Sensor accurately detects fluid level change in the reservoir and interstice of a double wall storage tank. The Single-Point has one float and can be used in low groundwater locations. If an inner-wall leak occurs, the brine seeps into the tank triggering a fuel alarm, or if the outer wall leaks, the brine seeps out of the tank interstice triggering a fuel alarm.

With our Single-Point Hydrostatic Sensors, if either an inner or outer leak occurs, the brine level decreases and a low-level alarm is triggered. 

Key Benefits

Single-Point sensor alarm conditions: 

  • Leak in inner or outer wall triggers a low level alarm in low groundwater areas
  • Meets California's requirement for secondary space monitoring for tanks as required by AB 2481 

Product Form

Part Number




Single-Point Hydrostatic Reservoir Sensor

Vented riser cap assembly included



Fuel Compatibility

Gas, Diesel, Kerosene, Jet Fuel, Aviation Gas, E15, E85, Bio-Diesel 20, Green Diesel

Reservoir Solution Compatibility

Up to 50% ethylene glycol in water; up to 50% propylene glycol in water; salt brine solution of up to 30% CaCl

Alarm Notification

Normal: Float is in the UP position (correct amount of brine in reservoir)

Fuel Alarm: Brine level below 1.74” (4.4cm)

Sensor Out: Sensor not communicating to ATG Console

Operating Principle

Reed Switch / Float

Product Activation Height

1.75” (4.4cm)

Operating Temp

-13 to +135°F (-25 to +57°C)


6” (15cm) High, 2.5” (6.4cm) in Diameter

Standard Cable

12ft (3.65m)