When selecting a part number for a pressure transmitter you will need to choose a pressure range. Usually a manufacturer will designate pressure ranges in the most common unit used by it’s customers.
For the USA the most common unit is psi and for Europe it is bar, but what if you are working with other units such as kPa or inHg, is it possible to use a pressure transmitter scaled in bar or psi for other types of unit?
All pressure units are linearly proportional to each other, so if the pressure range is doubled it will also be doubled in whatever units are chosen for conversion.
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A pressure transmitter has an electrical output measured in milliamps typically over a range of 4 to 20mA. If the range is 0 to 100 bar, the output will be 4mA at 0 bar and 20mA at 100 bar. Since pressure is read in milliamps it can be converted into any unit using the appropriate bar conversion factor. So a 100 bar pressure transmitter could also be used as a 0-1450 psi, 0-2950 inHg or 0-1020 mH20 as well.
In summary the type of pressure unit specified on a pressure transmitter marking label or data sheet is for reference purposes only and does not restrict it’s use with other engineerings units as long as the correct conversion factor is applied.
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