Micro Motion RFT9709 Manual de instrucciones descargar pdf (Pagina 159)

Using ProLink

Software with Micro Motion

Transmitters

145

Calibrate Menu

continued

Density calibration

Applications Menu Help Menu

Configure Menu:

Meter Factors

Calibrate Menu Test Menu

Calibration Record, shown in

Appendix F

, page 189. Follow these steps

to perform a density calibration for an IFT9701 or IFT9703:

1. Density calibration requires reading and entering density values in

grams per cubic centimeter

. To change the density unit of

measure:

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

b. In the Configure Transmitter Variables dialog box, open the

density units list box, then select g/cc as the density unit.

c. Click OK.

2. Perform a two-point or one-point density calibration:

• To perform a two-point density calibration for an IFT9701 or

IFT9703, follow the procedures in steps 3 and 4.

• If performing a one-point density calibration, follow either step 3

or step 4.

3. To perform the low-density calibration:

a. Fill the sensor with a low-density fluid, such as air.

b. If possible, shut off the flow. Otherwise, pump the fluid through

the sensor at the lowest flow rate allowed by the process.

c. Use any established method to derive an accurate density, in

grams per cubic centimeter, for the fluid at line conditions. If air is

the low-density calibration fluid, a value from

Table 14-2

can be

used for the density.

d. Open the Calibrate menu, then choose Density. At the cascading

menu, choose First Point (Air) or Dual Point (Air & Water) to open

the Density Point 1 dialog box, shown in

Figure 14-7

e. Enter the line-condition density,

in grams per cubic centimeter

into the Enter Density text box, then choose Do Cal. ProLink

reads density, determines tube period, corrects it to 0°C, and

updates the density calibration factor, indicating per cent

complete. The indicator in the dialog box blinks ON and OFF

while density calibration is in progress. When the indicator stops

blinking, the low-density calibration is complete.

CAUTION

If dual-point density calibration is initiated, failure

to perform the entire procedure will result in

inaccurate density measurement.

To avoid inaccurate density measurement, initiate

dual-point density calibration only when the entire

procedure can be completed. Otherwise, perform only

the first point (air) or second point (water) procedure.

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