3410 Series Gas Ultrasonic Meters Operations Manual
Section 5: Calibrate and configure the meter
3-9000-777 Rev E
January 2018
Configure Temperature and Pressure
67
5.10
Configure Temperature and Pressure
5.10.1
Flow-condition pressure and temperature
The flow-condition pressure and temperature are used by the Daniel 3410 Series Gas Ultrasonic
Flow Meter for various calculations such as
•
expansion correction
•
flow profile correction (JuniorSonic
™
meters only)
•
calculation of base (standard) condition volumetric flow rate and volumes
•
optional AGA10 sound velocity calculation
Configuration
The flow-condition pressure and temperature are individually configurable (via the
EnablePres-
sureInput
and
EnableTemperatureInput
data points) to be:
•
disabled (0),
•
live (1) (4-20 mA input signal)
•
fixed (2).
If an input is live, then the values corresponding to the minimum and maximum input (4 and
20 mA, respectively) are specified via data points (
MinInputPressure
,
MaxInputPressure
,
MinIn-
putTemperature
,
MaxInputTemperature
).
If an input is fixed, then its value is specified via a data point (
SpecFlowPressure
,
SpecFlowTem-
perature
).
Alarm limits can be specified for each input (
LowPressureAlarm
,
HighPressureAlarm
,
LowTem-
peratureAlarm
,
HighTemperatureAlarm
). Additionally, the flow-condition pressure is
configurable to be gage or absolute (via the
InputPressureUnit
data point). If the pressure is
gage, then the atmospheric pressure must be specified (via the
AtmosphericPress
data point).
See
Section 5.10.2
and
Section 5.10.3
for details on configuring the flow-condition pressure
and temperature.
Another data point (
FlowPOrTSrcUponAlarm
), common to both pressure and temperature, is
used to specify the data source to use when the selected input data is invalid (i.e., value at or
outside its alarm limits or a live input in calibration) as either
•
last good value (0), or
•
fixed value (1).
This data point (
FlowPOrTSrcUponAlarm
) is
not
configurable via the Daniel MeterLink
Field Setup
Wizard
; however, it
is
configurable via the Daniel MeterLink
Tools|Edit/Compare Configuration
screen. The default is to use the last good value.