This is a normally closed fuel/liquid sensor with either a 5 & 15' long cable.
 
This sensor works with Veeder Root TLS(250-300-350-450-450+-4-LS), Incon and any system looking for an N.C. to Open signal. (EXCEPT ILS350)

It is intrinsically safe and compatible with gasoline and diesel fuel.
 
If you let us know which Device you using for we can email you or ship you the installation instruction.

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When using a Normally Closed Sensor on a Veeder Root you need to program the sensor into the console as follows:(Incon already uses N/C sensors to no need to do anything)

Mode>Set Up>Liquid Sensor Set Up> and change it from whatever it reads (Ie. Tri-State, Dual Float, ect..)  to NORMALLY CLOSED.

POWER CYCLE TANK MONITOR ! ! !