Filter
Top Products
194 Calibration
Section 6: Meter operation Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
Equation 6-9 Wet-calibration gas flow velocity
where
Piece-wise linearization
If the 12-point piece-wise linearization (PWL) wet calibration method is selected, then the dry-
calibration gas flow velocity is calculated as shown in Equation 6-10.
The inputs to the 12-point piece-wise linearization are the (up to) 12 pairs of volumetric flow
rate and meter factor for each flow direction ([FwdFlwRt1, FwdMtrFctr1], ...,
[FwdFlwRt12, FwdMtrFctr12] for forward flow; [RevFlwRt1, RevMtrFctr1], ...,
[RevFlwRt12, RevMtrFctr12] for reverse flow). Refer to Section 5.7.3 for information on using
the Daniel MeterLink
Field Setup Wizard for entering these data point values.
Equation 6-10 Wet Calibration - 12-Point Piece-wise linearization
where
The linear meter factor is determined by the PWL inputs, the flow direction, and the dry-
calibration gas flow velocity.
=
wet-calibration gas flow velocity (m/s) (AvgFlow)
=
dry-calibration gas flow velocity (m/s) (DryCalVel)
=
selected wet calibration function
=
wet-calibration gas flow velocity (m/s) (AvgFlow)
=
dry-calibration gas flow velocity (m/s) (DryCalVel)
=
linear meter factor (dimensionless) (LinearMeterFctr)
V
WetCal
WetCalFunction V
DryCal
()=
V
WetCal
V
DryCal
WetCalFunction x()
The input flow rates should be entered in descending order (highest first) with their
corresponding meter factors. If these are entered in the wrong order, the meter will still work
but the accuracy may be affected. The meter will not accept negative values, so only positive
values should be entered for both forward and reverse flow rates. If fewer than 12 points are
to be used, the unused flow rate and meter factor pairs should be set to 0 and 1 respectively.
V
WetCal
V
DryCal
LinearMeterFctr×=
V
WetCal
V
DryCal
LinearMeterFctr