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:
- Using a reference pressure device, apply the desired offset trim value (low-pressure value).
- 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.
- Using a reference pressure device, apply the desired slope trim value (high-pressure value).
- Once the applied pressure has stabilized, use the transmitter’s slope trim command.
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