The Choice of Transmitter Range for a Application

The choice of transmitter range for a application is actually quite simple.

For a piped and capability installation measure the distance between the installed transmitter in the field (or the position you plan to install the transmitter) and the top tapping point on the vessel. Say this distance is 3000mm. Now you know that you need a DP transmitter that will be able to read at least -3000 to + 3000mmH2O. Keeping in mind that ideally the max measurement should always be as close to the maximum capability of the transmitter so select a transmitter, in this example, that is just slightly bigger than 3000mm for instance something like -3200 to +3200mmH2O.

The further you move away from the max measurement with your selection the less sensitive the measurement will become and if you move to far away the measurement can actually become inaccurate due to the inaccuracy tolerance that become to big. This will only start to happen if you select a transmitter with a range about three time the size of the max measurement.

So the best is to stay as close to the max measurement as possible during the selection.
Since most of the time the transmitter specs are given in PSI or mBar or Kpa, just convert the 3000mmH2O into whatever units the transmitter specs are given in and you will find the transmitter that is perfect for your application.

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