Emerson MICRO MOTION 2700 Manual de Instalação descarregar pdf (Página 114)

104 Transmitter Configuration and Use: Series 1000 and 2000 Transmitters

Pressure Compensation, Temperature Compensation, and Polling continued

9.2.2 Pressure 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). Micro Motion calibrates flowmeters at the factory to

National Institute of Standards and Technology (NIST) standards (20 psi).

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/cm

/psi

Not all sensors or applications require pressure correction factors. For a discussion of pressure effect,

see the EXPERT

system at www.expert2.com. 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).

9.2.3 Pressure measurement unit

The default measurement unit for pressure is

PSI. In other words, the transmitter

expects to receive pressure data in PSI.

If you will use a different pressure measurement unit, you must configure the

transmitter to use that measurement unit. To access the pressure measurement unit

parameter, see the menu flowcharts for your transmitter.

See Table 9-1 for a complete list of pressure measurement units.

Table 9-1 Pressure measurement units

Pressure unit

Unit descriptionProLink II Communicator

In Water @ 68F inH2O Inches water @ 68 °F

In Mercury

@ 0C inHg Inches mercury @ 0 °C

Ft Water

@ 68F ftH2O Feet water @ 68 °F

mm Water

@ 68F mmH2O Millimeters water @ 68 °F

mm Mercury

@ 0C mmHG Millimeters mercury @ 0 °C

PSI psi Pounds per square inch

bar bar Bar

millibar mbar Millibar

g/cm2 g/Sqcm Grams per square centimeter

kg/cm2 kg/Sqcm Kilograms per square centimeter

pascals Pa Pascals

Kilopascals kPa Kilopascals

Torr

@ 0C torr Torr @ 0 °C

atms atms Atmospheres

• Model 1500 AN

• Model 1700 AN

• Model 1700 IS

• Model 2500 CIO

• Model 2700 AN

• Model 2700 IS

• Model 2700 CIO

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 263 264

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