Emerson Process Management 3400 ユーザーズマニュアル
208
Flow-condition pressure and temperature
Section 6: Meter operation
Reference, Installation, and Operations Manual
June 2013
3-9000-743 Rev S
The flow-condition absolute flow pressure is calculated as shown in
.
Equation 6-23 Flow-Condition Absolute Pressure
where
Live (Analog) Input Calibration
An analog input can be calibrated regardless of the corresponding input type (
EnablePressure-
Input or EnableTemperatureInput). However, if the corresponding input type is selected as
Live, then the input being calibrated is considered to be invalid and the in-use value depends
upon the
Live, then the input being calibrated is considered to be invalid and the in-use value depends
upon the
FlowPOrTSrcUponAlarm selection (see above). In this case, the appropriate data
point (
FlowPressureWhileCal, FlowTemperatureWhileCal) is set to the in-use value so that it
can be logged in the optional Audit log.
=
flow-condition absolute pressure (MPaa)
(
(
AbsFlowPressure)
=
flow-condition pressure (MPa if
InputPressureUnit=FALSE,
MPaa if
InputPressureUnit=TRUE) (FlowPressure)
=
(specified) atmospheric pressure (MPaa)
(
(
AtmosphericPress)
P
abs f
,
P
f
P
Atmosphere
+
=
InputPressureUnit
FALSE Gage
(
)
=
P
abs f
,
P
f
=
InputPressureUnit
TRUE Absolute
(
)
=
P
abs f
,
P
f
P
Atmosphere
The Option Board is required for live (analog) inputs (flow-condition pressure and/or
temperature).
temperature).
Configuration protection must be disabled when calibrating a Mark III live (analog) input.
In Daniel MeterLink, to calibrate a live (analog) input, use the
Calibration|Analog
Inputs
Wizard menu path. The Start screen is displayed first.