Tank Monitor Operation

CAUTION: Do not operate the pump without first depressing one of the tank buttons! Doing so can over pressurize the gauge, destroying its calibration and voiding the warranty. Over-pressurization is not covered under warranty.

Marine Tank Monitor

1. Depress the valve associated with the tank whose level you wish to read.
2. Hold the valve down and operate the pump moderately while watching the pressure gauge.
3. Continue to operate the pump until the gauge stops increasing in pressure.
4. The gauge reading at that point is the level of liquid presently in the tank, in inches.

Conversion formulae

The gauge reading may be converted to gallons by the following formulae
(all measurements in inches):

Rectangular tank ( tank length x tank width x liquid level ) / 231
Vertical cylindrical tank ( radius of the tank2 x 3.1416 x liquid level ) / 231
Horizontal cylindrical tank A horizontal cylindrical tank requires a book of trig tables or a calculator to determine the amount of liquid, and thus is beyond a simple formula as presented here.


A rectangular tank 22 inches long by 14 inches wide with a level of 13 inches has 17.33 gallons of liquid in it: ( 22 x 14 x 13 ) / 231 = 17.33

A vertical cylindrical tank 18 inches in diameter with a liquid level of 27 inches has 29.7 gallons of liquid in it: ( 92 x 3.1416 x 27 ) / 231 = 29.74