Emerson MICRO MOTION 2700 Manual de Instalação descarregar pdf (Página 116)

106 Transmitter Configuration and Use: Series 1000 and 2000 Transmitters

Pressure Compensation, Temperature Compensation, and Polling continued

9. If you will use a static pressure value:

a. Ensure that polling for pressure is not configured. Polling for temperature is allowed. See

Section 9.4.

b. Select

Static pressure.

c. Enter the static pressure.

d. Press ENTER.

e. Press SEND.

f. Press HOME.

9.3 External temperature compensation

Temperature data are used in several different calculations. Micro Motion sensors

always report temperature data to the transmitter. For greater accuracy, you can

configure the transmitter to use a different temperature value.

There are two ways to configure external temperature compensation:

• If the operating temperature is a known static value, you can enter the

operating temperature in the software, and not poll a temperature

measurement device.

• If the operating temperature varies significantly, you configure the

transmitter to poll for an updated temperature value from an external

temperature measurement device. Polling requires HART/Bell202

communications over the primary mA output.

Note: If your core processor is v2.1 or earlier, and you configure the transmitter for external

temperature compensation, the temperature value from the compensation procedure will replace the

sensor value in all calculations that require temperature data. If your core processor is v2.2 or later,

the temperature value from the compensation procedure is used only for enhanced density and

petroleum measurement calculations.

Note: If you configure a static temperature value, ensure that it is accurate. If you configure polling

for temperature, ensure that the external temperature measurement device is accurate and reliable.

You can configure external temperature compensation with ProLink II or the Communicator.

With ProLink II

To configure external temperature compensation with ProLink II:

1. From the

View menu, select Preferences.

2. If the

Use External Temperature checkbox does not already contain a checkmark, click the

checkbox, then click

Apply.

3. If you will poll an external device for temperature data:

a. Ensure that the transmitter is configured to use the same temperature measurement unit

that the external temperature measurement device uses (see Section 6.4).

b. Follow the polling setup instructions in Section 9.4.

• Model 1500 AN

• Model 1700 AN

• Model 1700 IS

• Model 2500 CIO

• Model 2700 AN

• Model 2700 IS

• Model 2700 CIO

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