Micro Motion RFT9709 Instrukcja Obsługi Pobierz pdf (Strona 154)

140

Using ProLink

Software with Micro Motion

Transmitters

Calibrate Menu

continued

Density calibration

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

• To perform a two-point density calibration for an RFT9739, follow

the procedures in steps 3 and 4.

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

or step 4.

• The third-point density calibration procedure is described in

step 5.

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) to open the Density Point 1 dialog

box, shown in

Figure 14-4

e. Enter the line-condition density,

in grams per cubic centimeter

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

transmitter measures the tube period, corrects it to 0°C, and

stores the value. 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.

Figure 14-4. Density Point 1 Calibration dialog box for RFT9739

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Micro Motion RFT9709 Instrukcja Obsługi Strona 154