3410 Series Gas Ultrasonic Meters Operations Manual
Section 5: Calibrate and configure the meter
3-9000-777 Rev E
January 2018
Calibration methods
39
51
Section 5: Calibrate and configure the meter
Use Daniel MeterLink to calibrate and configure the meter parameters: Analog (current), Meter
Factors, Flow Calibration, Frequency/Digital Output Sources, Frequency and Digital inputs and
outputs, HART output, Meter corrections (for Models 3412 and 3411), Temperature and
Pressure, AGA8 calculations, and Local Display parameters.
5.1
Calibration methods
The Daniel 3410 Series Gas Ultrasonic Flow Meter meter uses two calibration steps: “dry”
calibration and “wet” calibration.
In this methodology, the “dry-calibration” values are set by Daniel at the factory and are not
expected to be modified; the “wet-calibration” values are expected to be set as the result of a
user flow calibration (if desired). These two calibration methods are explained in further detail
below.
Important
The
WRITE PROT.
switch on the CPU Module must be disabled (
OFF
) before writing calibration
factors to the meter.
After the meter is configured, enable the
WRITE PROT.
switch (
ON
)to write-protect the
configuration.
Collect a Maintenance Log and configuration file the meter’s “As left” configuration settings.
5.1.1
Dry calibration
The dry-calibration gas flow velocity is the result of applying a third-order polynomial equation
to the average weighted gas flow velocity as shown in
Equation 5-1
to correct for static or zero
flow conditions.
Equation 5-1 Dry-calibration gas flow velocity
where
Note that the meter provides two sets of dry calibration coefficients - one set for each flow
direction.
=
dry-calibration gas flow velocity (m/s) (
DryCalVel
)
=
average weighted gas flow velocity (m/s) (
AvgWtdFlowVel
)
=
dry-calibration 0th order coefficient (m/s) (
FwdA0 or RevA0
)
=
dry-calibration 1st order coefficient (dimensionless)
(
FwdA1 or RevA1
)
=
dry-calibration 2nd order coefficient (s/m) (
FwdA2 or RevA2
)
=
dry-calibration 3rd order coefficient (s2/m2) (
FwdA3 or RevA3
)
V
DryCal
A
0
A
1
V
+
AvgWtd
A
2
V
AvgWtd
2
A
3
V
AvgWtd
3
+
+
=
V
DryCal
V
AvgWtd
A
0
A
1
A
2
A
3
