Calibrating field transmitters

Calibration Level Pressure Q&A

For measuring the liquid level in a close tank, we have a differential pressure transmitter with a flange-mounted remote seal. The application range is from -56mbar to 6 mbar. I have a DRUCK DP610 calibrator, but I couldn't calibrate the transmitter in the field. Any ideas?

Expert’s answer: Calibrating field transmitters

So, calibrating field transmitters… The short answer is that yes, calibration is always important. However, you don’t need to precisely calibrate your level transmitter in the field because sometimes it has to calibrate in a different measurement range. If you can’t generate the process values in the field or workshop, then you have to set up the transmitter with an acceptable range to use a field calibrator like a DRUCK.

First, remove the transmitter from the process. Make sure you clean the sensor where it makes contact with the process before you start the calibration. Next, find the range of your transmitter and the range of your field calibrator. Between the two, try to pick a range that covers most of the transmitter range.

While you calibrate, make sure the transmitter offers the accuracy, linearity, and hysteresis needed by the process and set by the vendor. If necessary, adjust the offset trim and the slope trim of the transmitter.

Offset trim - Calibrating field transmittersSlope trim - Calibrating field transmitters

Remember that you may need to adjust the zero when you return the transmitter to the process.

Want to learn more about calibrating field transmitters?

If you want a qualified calibration service, these companies have options:

Other resources that might interest you

Best method to calibrate displacement sensors?
What’s the best method to calibrate displacement sensors?

Level transmitter calibration!
I’d like to know more about calibration of level transmitters. Do we really need to calibrate these devices?

Transmitter calibration range
Are there rules for calibration ranges?

Temperature sensor calibration
Is there another way to calibrate your temperature sensors than to use a temperature bath or a fluidized bed?

Related tags: Calibration Calibration procedure DP Field calibrator level level application Linear offset Slope correction
Comments
Calibrating field transmitters
Types of non-contact level measurement
Everything you need to know about point level detection
#LinkeInsights: Base Conditions for Orifice Calculation
Dead zone or blocking distance of level transmitters
See related devices