FUEL TANK OVERFILL ALARM beeps loudly and LED flashes if liquid level is high.


Monitor fuel tank level in hazardous locations

  • battery powered so its always working.


  • Replaceable Lithium battery included lasts for years.


  • Loud buzzer is 101dB @ 2 ft. (like a smoke alarm)


  • Rugged metal construction. Built for rough, wet and  outdoor locations.

  • Bright flashing LED  visible in daylight.


  • Low battery built in
  • Silencing/test button.


  • Hazloc Class 1, Div. 1. groups C and/or D. 60079-0 and 60079-11.   Zone 0.

EASY TO INSTALL. Mounts on any fuel tank with either a hand-adjustable depth PVC tank mount.  or an optional 2″ NPT threaded plug is available if needed.
Battery powered so it can be located anywhere, instantly.


When there is a high liquid level condition, the buzzer sounds and the beacon LED flashes. Press the button to silence the buzzer, and the LED continues to flash as a reminder. This is the default mode although there are other behaviors available.  The 101 dB buzzer has a unique warbling sound is very arresting so it will be heard at long distances.

Different behaviors are field-selectable using DIP switches on the circuit board. Choose from:

  • 30-minute snooze alarm, (on/off)
  • tank filling mode (where it shuts off LED and buzzer until the next fillup)
  • auto/manual reset after level corrected
  • relay N.O./N.C.
  • delayed  relay outupt 15 minutes

Materials: stainless steel pipe and 0.70 specific gravity SS float switch is suitable for almost all fuels and flammable solvents.

Battery Power is uninterruptible and allows installation anywhere. No outlets, electricians, or inspectors needed. The Lithium batteries included and have a shelf life of 20 years.  Smart software allows these to sound for a month straight! In typical situations the batteries will last for many years. When the batteries do run low, a unique low-battery signal is given.  Batteries are user-replaceable in the hazardous location.

Durable Aluminum electronics enclosure.
Pipe and float switch are 316 stainless steel construction.

Harsh Weather rated temperature range is +60ºC to -40º C. [140ºF to -40ºF]

Grounding lug is included for ground to the bulk fuel storage tank.



Compression tank mount - stainless
Thumbscrew Mount - stainless steel

Order Here

Stainless Pipe and Float Switch
Length (working depth)
Float orientation (float switch is reversible)


Relay Output

A relay output for signals sent to an approved I.S. barrier. 80mA max.  10ft cable is standard.
[IS-RLY] $54

Welded Plug

A 2″NPT  stainless steel plug welded to the pipe. Depth is not adjustable.
[RB-SS] $56

Stainless Rim Mount

Bracket secures a tank alarm to the rim of an open tank.   more info

Replacement Battery

This is the only battery that may be used with GIZMO I.S. alarms
[BT-IS] $45

Extra cable

Extra cable length over the standard length of 10 feet that’s included. Heavy 0.032″ jacket for superior durability. Four stranded conductors x 24 gage.
[C4] $1.28/ft