Slope and offset calculation serves to linearize the output over the pressure and temperature range of a differential pressure transmitter. Here’s what that means and how to do it.

Slope and offset calculation

The slope and offset calculation for a differential pressure transmitter is simple on Rosemount devices, and the following steps come straight from Emerson’s own calibration document:

  1. Using a reference pressure device, apply the desired offset trim value (low-pressure value).
  2. Once the applied pressure has stabilized, use the transmitter’s offset trim command. The offset trim point is typically done at a zero point with no pressure value applied.
  3. Using a reference pressure device, apply the desired slope trim value (high-pressure value).
  4. Once the applied pressure has stabilized, use the transmitter’s slope trim command.
Offset and slope for differential pressure transmitter
Offset and slope

To know more about the differential pressure transmitter, please ask our engineers!

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