Micro Motion RFT9709 Manuál s instrukcemi Strana 102

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88
Using ProLink
®
Software with Micro Motion
®
Transmitters
Configure Menu: Characterize
continued
Pressure compensation with RFT9739
Enter the new flow calibration factor into the FlowCal text box in the
Characterize Sensor dialog box.
Density measurement
If the sensor is one of the models listed below, and it operates at a
relatively constant pressure, the user can adjust the density calibration
settings:
For an ELITE CMF100, CMF200, CMF300, or CMF400 sensor,
adjust the K2 density constant.
For a Model D300, D600, DL100, or DL200 sensor, adjust the
second five digits of the density calibration factor.
Follow these steps to adjust the density calibration settings:
1. Use the following equation to find the density offset (convert pressure
to psig for use in this equation):
Density offset = K
Pden
P
meas
Where:
K
Pden
= Pressure correction factor for density (listed in
Table 8-4
)
P
meas
= Measured pressure, in psig, at sensor inlet
After finding the density offset, use the following equation to calculate
the correct density:
Density
corrected
= Density
measured
+ Density offset
Example:
Given:
A CMF300 sensor will operate at 100 psig. After being
calibrated for flow at 20 psig, the sensor has a flow calibration factor of
697.624.75.
Problem:
Apply pressure compensation by calculating a new flow
calibration factor using the CMF300 pressure correction factor.
Solution:
Flow cal factor
new
= 697.62 [1 + (0.0006)(0.01)(100 -20)]
= 697.62 (1.00048)
= 697.95
The new flow calibration factor is:
697.95 4.75
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