Micro Motion RFT9709 Manual de instrucciones Pagina 158

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144
Using ProLink
®
Software with Micro Motion
®
Transmitters
Calibrate Menu
continued
Density calibration
c. 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.
d. With the process under no-flow or low-flow conditions, open the
View menu, then choose Process Variables. Read the density of
the process fluid, taking note of the value for use in step 5g.
e. Pump the fluid through the sensor at the highest flow rate allowed
by the process. The rate must be greater than the appropriate
value from
Table 14-1
, or the calibration will be in error. To ensure
stable density, make sure the fluid in the flow tubes remains
completely
free of gas bubbles during the calibration.
f. Open the Calibrate menu, then choose Density. Then select
Density Point 3 from the cascading menu to display the Density
Point 3 Calibration dialog box, shown in
Figure 14-6
.
g. Enter the density, in grams per cubic centimeter, that was read
from the Process Variables window in step 5d. The indicator in
the dialog box blinks ON and OFF while density calibration is in
progress. When the indicator stops blinking, the third-point
density calibration is complete.
Figure 14-6. Density Point 3 Calibration dialog box for RFT9739
Density calibration for
IFT9701/IFT9703
During density calibration, write values in the appropriate Flowmeter
CAUTION
Density calibration will cause measurement error.
Density calibration affects the IFT9701 and IFT9703
flow, temperature, and viscosity calculations, and will
require completely recalibrating the flowmeter for
temperature, density, and viscosity measurement.
Density calibration of the IFT9701 and IFT9703 is not
recommended.
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