Micro Motion RFT9709 Instrukcja Obsługi Pobierz pdf (Strona 90)

Using ProLink

Software with Micro Motion

Transmitters

Configure Menu: Characterize

continued

Flow calibration factor

Sensor or transmitter

replaced in the field

If the sensor or transmitter is replaced in the field, the user must

re-characterize the transmitter by programming the new sensor flow

calibration factor into the transmitter. (For an RFT9739, IFT9701,

IFT9703, RFT9712, or RFT9729 that is shipped without a sensor, the

default value — which

must

be changed — is 1.00005.13).

To characterize the transmitter for flow measurement:

• Enter the flow calibration factor (eight digits and two decimal points)

from the sensor serial number tag — this is the preferred method;

• Enter the flow calibration factor (eight digits and two decimal points)

from the calibration certificate that was shipped with the sensor.

Field flow-calibration

Flow calibration is performed at the factory to NIST (National Institute of

Standards and Technology) standards. If, after characterizing the

transmitter for flow as described above, the meter fails to perform within

the accuracy specifications provided by Micro Motion, it might be

necessary to perform a field flow-calibration or, for a Version 3.0, 3.5, or

3.6 RFT9739, to adjust the meter factor (see

Chapter 13

If a field flow-calibration is performed, and the transmitter is an RFT9739

using a pressure input for pressure compensation, the user should enter

the calibration pressure in the FlowCal Pressure text box. Enter the

value in psi. For more information on pressure compensation, see

Section 8.7

, page 86.

In the flow calibration procedure, a batch of fluid is run through the

sensor, then the weighed amount of fluid in the batch is compared with

the measured amount of fluid indicated in the Totalizer Control dialog

box. To perform a flow calibration, follow these steps:

1. Set process control devices for manual operation.

2. For an IFT9701, IFT9703, RFT9712, or RFT9729, if the application

requires volume flow measurement, choose a mass flow unit for the

flow calibration, then choose a volume flow unit for the application

after the calibration is complete. The flow calibration factor will be the

same regardless of the mass flow unit that is chosen.

To select a mass flow unit:

a. Open the Configure menu, then choose Transmitter Variables.

b. When the Configure Transmitter Variables dialog box appears,

open the Units list box under Mass/Volume Flow (for an IFT9701

or IFT9703) or Mass Flow (for an RFT9712 or RFT9729) to select

a standard engineering mass flow unit.

For more information about configuring flow units, see

Section 9.2

page 93.

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