Technical data

4 Daniel Liquid Ultrasonic Flow Meters
calibration and configuration
parameters
4.1 Calibration methods
Factory calibration and user-defined calibration
The Daniel 3810 Series Liquid Ultrasonic Flow Meter uses two calibration corrections:
“Factory Calibration” and “Customer Calibration”. In this methodology, the“Factory
Calibration” values are set by Daniel at the factory and are not expected to be modified;
the “Customer 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.
4.1.1 Factory calibration method
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 for the meter’s “As left”
configuration settings.
CAUTION!
Modification of the factory calibration parameters is not recommended. The dry calibration
parameters should not be modified unless directed by Daniel personnel.
The factory calibrated flow velocity is the result of applying a third-order polynomial
equation to the average weighted flow velocity as shown in Equation 4-1.
Factory-Calibrated Average Flow Velocity Equation 4-1:
V
F
actoryCal
= A
0
+ A
1
V
AvgWtd
+ A
2
V
AvgWtd
2
+ A
3
V
AvgWtd
3
V
FactoryCal
=
factory-calibrated average flow velocity (m/s) (FactoryCalVel)
V
AvgWtd
=
average weighted flow velocity (m/s) (AvgWtdFlowVel)
A
0
=
factory-calibration 0th order coefficient (m/s) (FwdA0 or RevA0)
A
1
=
factory-calibration 1
st
order coefficient (dimensionless) (FwdA1 or RevA1)
A
2
=
factory-calibration 2
nd
order coefficient (s/m) (FwdA2 or RevA2)
A
3
=
factory-calibration 3
rd
order coefficient (s
2
/m
2
) (FwdA3 or RevA3)
Daniel Liquid Ultrasonic Flow Meters calibration and configuration parameters
Operations 27