Emerson Daniel 3410 Series User Manual

68 Flow-condition pressure and temperature
Section 5: Calibrate and configure the meter 3410 Series Gas Ultrasonic Meters Operations Manual
January 2018 3-9000-777 Rev E
Data updates
The Daniel 3410 Series Gas Ultrasonic Flow Meter samples the input analog signal(s) and
updates the corresponding data point(s) (
LiveFlowPressure, LiveFlowTemperature) once per
second regardless of the input selection (disabled, live, or fixed).
Every five seconds, the meter updates the “in-use” flow-condition pressure and temperature
values (
FlowPressure, AbsFlowPressure, FlowTemperature) depending upon the input selection,
validity of the input data, and the selected data source upon alarm according to Ta bl e 5-7 .
The flow-condition absolute flow pressure is calculated as shown in Equation 5-6.
Equation 5-6 Flow-Condition Absolute Pressure
where
Table 5-7 Flow-condition pressure and temperature data source
Input Type
(EnablePressureInput or
EnableTemperatureInput)
Data Validity
(PressureValidity or Tem-
peratureValidity
)
Data Source Upon Alarm
(FlowPOrTSrcUponAlarm)
“In-Use” Data Source
(FlowPressure or FlowTem-
perature
)
Disabled N/A N/A “In-Use” value unchanged
Live Valid N/A Average of live values
(LiveFlowPressure or Live-
FlowTemperature
)
Invalid* Last good value “In-Use” value unchanged
Fixed Fixed data point
(SpecFlowPressure or Spec-
FlowTemperature)
Fixed Valid N/A Fixed data point
(SpecFlowPressure
or Spec-
FlowTemperature)
Invalid Last good value “In-Use” value unchanged
Fixed Fixed data point
(SpecFlowPressure or Spec-
FlowTemperature)
*Live input can be invalid due to (a) one or more live values is/are at or outside the alarm limits, or (b) the input is being cali-
brated.
=
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

Emerson Daniel 3410 Series Specifications

General

Brand	Emerson
Model	Daniel 3410 Series
Category	Measuring Instruments
Language	English