How To Choose A Tank Gauge

What Types Are Available:

  • Float/Cat & Mouse – Indicates Empty, 1/4, 1/2, 3/4 or full.
  • Sight Gauge – Push button to see level in tube.
  • Ultrasonic – Household wall socket “plug in” digital display shows level in graduations.
  • Hydrostatic Analogue – Displays tank contents as a percentage or in litres.
  • Hydrostatic Digital – Battery or mains powered. Digital display shows contents in litres, centimeters or as a percentage.
  • Pressure sensor – Mains powered using a pressure sensor with digital display showing contents in litres & as a percentage. High & low level tank alarm options.
  • Web Logger option – Data is transferred to a web site where the reporting system allows viewing of fuelling and delivery details in tabular or graphic formats.

How accurate are they:

  • The more you pay the more accurate they are.
  • Float, sight gauge and ultrasonic plug in types – These give an approximate indication of tank contents.
  • Hydrostatic Analogue – Accurate to approximately +/-2%.
  • Hydrostatic Digital – Accurate to +/- 1%, 0.5% or 0.25% depending on the model selected.
  • Pressure sensor type – Accurate to +/- 1%, 0.5% or 0.25% depending on the model selected.

What difference does accuracy make:

Taking, as an example, a typical 40,000 litre capacity fuel storage tank – the reading on a gauge, with an accuracy of +/- 2%, could be as much as 800 litres in error when the tank is full. In the same situation a gauge with an accuracy of +/1% could be up to 400 litres in error whereas a gauge accuracy of +/-0.5% could result in a 200 litre error. The larger the tank capacity the greater the margin for error with regards to contents measurements so the larger tank the greater the need for higher accuracy when choosing a tank gauge.


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