Micro Motion RFT9709 Instrukcja Obsługi Strona 161

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Using ProLink
®
Software with Micro Motion
®
Transmitters
147
Calibrate Menu
continued
Density calibration
Applications Menu Help Menu
Configure Menu:
Meter Factors
Calibrate Menu Test Menu
Density calibration for
RFT9712/RFT9729
During density calibration, write values in the appropriate Flowmeter
Calibration Record, shown in
Appendix F
. Follow these steps to perform
a density calibration for an RFT9712 or RFT9729:
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 RFT9712 or
RFT9729, 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 air.
b. If possible, shut off the flow. Otherwise, pump the air through the
sensor at the lowest flow rate allowed by the process.
c. 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 14-9
.
d. 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 14-9. Density Point 1 Calibration dialog box for RFT9712/RFT9729
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