Emerson Process Management 2400S manual Pressure correction factors, Configuration

Pressure Compensation and Temperature Compensation

9.2.2Pressure correction factors

When configuring pressure compensation, you must provide the flow calibration pressure – the pressure at which the flowmeter was calibrated (which therefore defines the pressure at which there will be no effect on the calibration factor). Enter 20 PSI unless the calibration document for your sensor indicates a different calibration pressure.

Two additional pressure correction factors may be configured: one for flow and one for density. These are defined as follows:

•Flow factor – the percent change in the flow rate per psi

•Density factor – the change in fluid density, in g/cm3/psi

Not all sensors or applications require pressure correction factors. For the pressure correction values to be used, obtain the pressure effect values from the product data sheet for your sensor, then reverse the signs (e.g., if the pressure effect is 0.000004, enter a pressure correction factor of –0.000004).

9.2.3Configuration

To enable and configure pressure compensation:

•With ProLink II, see Figure 9-1.

•With a DeviceNet tool, see Figure 9-2.

Figure 9-1Configuring pressure compensation with ProLink II

Enable

View >

Preferences

Enable External Pressure

Compensation

Apply

Set measurement unit(1)

ProLink >

Configuration >

Pressure

Enter Pressure units

Apply

Configure
	ProLink >
	Configuration >
	Pressure
	Enter Flow factor
	Enter Density factor
	Enter Cal pressure
	Apply
	Use static
No	pressure value?	Yes
Set up output		Enter External

(1)Pressure measurement unit must be configured to match pressure unit used by external device. See Section 6.3.

(2)See Section 9.4.

assembly(2)		Pressure
		Apply
	Done

84 Micro Motion® Model 2400S Transmitters for DeviceNet™