Difference Between Sensor with HART and Beamex

M

Thread Starter

Muhannad

Good Day,

Would you please explain the difference between calibrating Sensor using Beamex or any other certified calibration device and between calibrating the same sensor using HART communicator?

Thanks and Regards,
Muhannad
 
Control Engineering, a trade magazine, ran an article
http://www.controlengeurope.com/article/91592/Smart-devices--configuration-or-calibration-.aspx
that succinctly spells out what a HART communicator does - configures a field device, according to the quote below.

"<b>Configuration</b>
"An important feature of a smart transmitter is that it can be configured via the digital protocol. Configuration of a smart transmitter refers to the setting of the transmitter parameters. Configuration needs to be done via the communication protocol and, in order to do this, it is necessary to use some form of configuration device--typically also called a communicator--to support the selected protocol.

"Although a communicator can be used for configuration, it is not a reference standard and cannot be used for metrological calibration. Configuring the parameters of a smart transmitter with a communicator is not in itself a metrological calibration and will offer any assurance of accuracy."

The Beamex does HART configuration AND is can does metrological calibration and reporting as well.

The HART communicator does provide a reference temperature or a reference pressure.
 
Correction (the word NOT is missing above)
>The HART communicator does provide a reference temperature
>or a reference pressure.

Should be:
The HART communicator does NOT provide a reference temperature or a reference pressure.
 
J
The word "calibration" can mean three different things to different people.

Therefore the confusion:
1. Sensor trim to correct sensor drift
2. Range setting; the 4 mA and 20 mA point
3. Current trim to correct current output drift

Sensor trim (1) requires the input applied to be known so you need a
calibrator to measure that.

Current trim (3) requires the output current to be measured so you need a calibrator

Range setting (re-ranging) can be done using only a handheld field
communicator. Does not need a calibrator.

Sensor trim and current trim need a calibrator. You can either use a traditional "dumb" calibrator without digital communication together a separate handheld field communicator. Or you can use a modern "documenting calibrator" like Beamex which is calibrator and handheld field communicator built into one.

If you use FOUNDATION fieldbus instead of 4-20 mA/HART you don't need to do range setting or current trim because there is no current.

For complete explanation see the smart transmitter calibration tutorial found here:
http://www.eddl.org/DeviceManagement/Pages/Calibration.aspx

Cheers,
Jonas
 
Top