Micro Motion RFT9709 Instrukcja Obsługi Strona 101

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Using ProLink
®
Software with Micro Motion
®
Transmitters
87
Configure Menu: Characterize
continued
Pressure compensation with RFT9739
Configure Menu:
Transmitter Outputs
Configure Menu:
Transmitter Information
Configure Menu: EventsView Menu: Status
Configure Menu:
Characterize
Configure Menu:
Transmitter Variables
Table 8-4. Pressure correction factors
Compensation for stable
operating pressures
If the process pressure is relatively stable, the user can establish
pressure compensation by adjusting flow and density calibration factors.
In most applications, these calibration factors do not require adjustment
for pressure correction.
Flow measurement
If the sensor is one of the models listed in
Table 8-4
, and it operates at a
relatively constant pressure, the user can apply the following equation to
the first five digits of the flow calibration factor:
Where:
K
Pflow
= Pressure correction factor for flow
P
meas
= Measured pressure, in psig, at sensor inlet
P
cal
= Pressure at which the flowmeter was calibrated for
flow (20 psig for a factory-calibrated meter)
Sensor model
Correction factor for flow
(FlowFact)
Correction factor for density
(DensFact)
D300 0.009 0.00001
D600 0.005 0.0000031
DL100 0.005 0.000001
DL200 0.009 0.00001
CMF100 0.0002 0.000006
CMF200 0.0008 –0.000001
CMF300 0.0006 –0.0000002
F050 0.0007
F100 0.001
F200 0.0005
Flow cal factor
new
Flow cal factor
old
1
K
Pflow
0.01
()
P
meas
P
cal
()
+
[]=
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