Micro Motion RFT9709 Manuel d'instructions télécharger pdf (Page 146)

132

Using ProLink

Software with Micro Motion

Transmitters

Configure Menu: Meter Factors

continued

Entering meter factors

Some applications, such as custody transfer, require that the flowmeter

measurement be checked against a reference (proved) on a periodic

basis. Meter factors are useful for validating the stability of a flowmeter's

measurements over time.

After meter factors have been determined and entered, flowmeter

measurements are corrected. When the flowmeter is proved again, new

meter factors are determined from the following equation:

13.3 Entering meter factors

To enter meter factors, open the Configure menu, then choose Meter

Factors. The Configure Meter Factors dialog box appears, as depicted in

Figure 13-1

. Enter mass flow, volume flow, or density meter factors.

• If a mass-flow or density meter factor is entered, the volume meter

factor defaults to 1.0000.

• If a volume-flow meter factor is entered, the mass and density meter

factors each default to 1.0000.

• Only values from 0.8 to 1.2 may be entered.

Figure 13-1.Configure Meter Factors dialog box

New meter factor Current meter factor Meter factor from proving

Example:

The flowmeter is installed and proved: The flowmeter mass

measurement is 250.27 lb, the reference device measurement is

250 lb. A mass-flow meter factor is determined as follows:

A mass-flow meter factor of 0.9989 is entered.

One month later, the flowmeter is proved again. The flowmeter mass

measurement is 250.07 lb, the reference device measurement is

250.25 lb. A new mass-flow meter factor is determined as follows:

Meter factor

250

250.27

------------------0.9989==

Meter factor

0.9989 250

250.27

----------------------------------

0.9986

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Micro Motion RFT9709 Manuel d'instructions Page 146