
Configuration and Use Manual
95
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Compensa
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Chapter 9
Pressure Compensation,
Temperature Compensation, and Polling
9.1
Overview
This chapter describes the following procedures:
•
Configuring pressure compensation – see Section 9.2
•
Configuring external temperature compensation – see Section 9.3
•
Configuring polling – see Section 9.4
Note: All ProLink II procedures provided in this section assume that your computer is already
connected to the transmitter and you have established communication. All ProLink II procedures also
assume that you are complying with all applicable safety requirements. See Chapter 3 for more
information.
Note: All Communicator key sequences in this section assume that you are starting from the “Online”
menu. See Chapter 4 for more information.
9.2
Pressure compensation
The Model 2400S AN transmitter can compensate for the effect of pressure on the sensor flow tubes.
Pressure effect
is defined as the change in sensor flow and density sensitivity due to process pressure
change away from calibration pressure.
Note: Pressure compensation is an optional procedure. Perform this procedure only if required by
your application.
9.2.1
Options
There are two ways to configure pressure compensation:
•
If the operating pressure is a known static value, you can enter the external pressure in the
software, and not poll a pressure measurement device.
•
If the operating pressure varies significantly, you configure the transmitter to poll for an
updated pressure value from an external pressure measurement device. Polling requires
HART/Bell 202 communications over the mA output.
Note: If you configure a static pressure value, ensure that it is accurate. If you configure polling for
pressure, ensure that the pressure measurement device is accurate and reliable.
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