3410 Series Gas Ultrasonic Meters Operations Manual
Section 4: Flow measurement
3-9000-777 Rev E
January 2018
Temperature-effect expansion correction
31
4.5.4
Temperature-effect expansion correction
The meter is capable of correcting the raw volumetric flow rate for the effect of pipe expansion
due to temperature changes. Note that for the temperature-effect expansion correction factor
to be calculated, the correction must be enabled (via the
EnableExpCorrTemp
data point) and
the flow-condition temperature must be available (i.e., the
EnableTemperatureInput
data point
must be set to ‘Live’(1) or ‘Fixed’(2), see
Section 5.9.2
). The temperature-effect calculation is
shown in
Equation 4-12
. If the temperature-effect expansion correction factor is
not
calculated,
it is set to 1.0.
Equation 4-12 Temperature-Effect Expansion Correction
where
=
expansion correction factor due to temperature (dimensionless)
(
ExpCorrTemperature
)
=
pipe linear expansion coefficient due to temperature (K-1)
(
LinearExpansionCoef
)
=
flow-condition temperature (K) (
FlowTemperature
)
=
reference temperature for the pipe linear expansion coefficient (K)
(
RefTempLinearExpCoef
)
ExpCorr
T
1
3
α
×
T
f
T
ref
–
(
)
×
[
]
+
=
ExpCorr
T
α
T
f
T
ref
