How to choose a tank gauge:
- Float/Cat & Mouse – Indicates Empty,1/4, 1/2, 3/4 or full.
- Sight Gauges – Push a button to see level in the tube.
- Ultrasonic – Houshold 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 shoes contents in litres, centimeters or as a percentage.
- Pressure Sensor – Mains powered usuing a pressure sensor with digital display shoes 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 fueling & delivery in tabular or graphic formats
Tank Gauges – How accurate are they?
- The more you pay the more accurate they are.
- Float, Sight Gauge & Ultrasonic plug in types – these give an approximate indication of tank contents.
- Hydrostatic Analogue – Accurate to approximately +/-2%.
- Hydrostatic Digital – Accurate to +/- 1% of full scale (+/- 40mm).
- Pressure Sensor type – Accurate to +/- 1%, 0.5% or 0.25% depending on the model selected.
What difference does it 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 where as a gauge with an 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 measurement so the larger the tank the greater need for a higher accuracy when choosing tank gauges Lancashire.