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Reference, Installation, and Operations Manual Section 6: Meter operation
3-9000-743 Rev S June 2013
Average weighted gas flow velocity 191
Equation 6-5 Chord proportion calculation
where
When the meter has operated for a user-specified number of consecutive batches without any
chord failures, the meter updates each chord’s data values for the bin containing the chord
velocity as shown in Equation 6-6 and sets the bin’s “trained” indicator to TRUE. The PropUpdt-
Batches data point, configurable via the Daniel MeterLink
Edit/Compare Configuration screen,
specifies the number of consecutive failure-free batches required for updating the bin data
(range: [1, 1000], default: 24). The NumVals data point (that determines how quickly an
average value changes) is also configurable via the
Edit/Compare Configuration screen (range:
[1, 1000], default: 10).
Equation 6-6 Updating chord proportion bin data values
where
=
chord proportion (dimensionless)
=
chord velocity (m/s) (FlowVelA ... FlowVelD)
=
average weighted gas flow velocity (m/s)
(AvgWtdFlowVel)
=
chord bin (n+1)
st
average velocity (m/s)
=
chord bin n
th
average velocity (m/s)
=
update factor data point (dimensionless) (NumVals)
=
chord velocity (m/s) (FlowVelA ... FlowVelD)
=
chord bin (n+1)
st
average proportion value
(dimensionless)
=
chord bin n
th
average proportion value (dimensionless)
=
chord proportion (dimensionless)
Prop
chord
V
chord
V
AvgWtd
-------------------
=
Prop
chord
V
chord
V
AvgWtd
AvgVel
ChordBin
n 1+
AvgVel
ChordBin
n
NumVals 1–()⋅()V
chord
+
NumVals
--------------------------------------------------------------------------------------------------------------
=
AvgProp
ChordBin
n 1+
AvgProp
ChordBin
n
NumVals 1–()⋅()Prop
chord
+
NumVals
----------------------------------------------------------------------------------------------------------------------------
=
AvgVel
ChordBin
n 1+
AvgVel
ChordBin
n
NumVals
V
chord
AvgProp
ChordBin
n 1+
AvgProp
ChordBin
n
Prop
chord