Micro Motion RFT9709 Manual de instrucciones descargar pdf (Pagina 160)

146

Using ProLink

Software with Micro Motion

Transmitters

Calibrate Menu

continued

Density calibration

Figure 14-7. Density Point 1 Calibration dialog box for IFT9701/IFT9703

4. To perform the high-density calibration:

a. Fill the sensor with a high-density fluid, such as water.

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

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

ensure stable density, make sure the fluid in the flow tubes

remains completely free of gas bubbles during the calibration.

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

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

is the high-density calibration fluid, a value from

Table 14-4

, page

143 can be used for the density.

d. If First Point (Air) was chosen in step 3, above, or if a one-point

high-density calibration is being performed, open the Calibrate

menu, then choose Density. At the cascading menu, choose

Second Point (Water) to open the Density Point 2 dialog box,

shown in

Figure 14-8

. If Dual Point (Air and Water) was chosen in

step 3, the Density Point 2 dialog box is already displayed.

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 Density Point 2 dialog box blinks

ON and OFF while density calibration is in progress. When the

indicator stops blinking, the high-density calibration is complete.

Figure 14-8. Density Point 2 Calibration dialog box for IFT9701

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Micro Motion RFT9709 Manual de instrucciones Pagina 160