Emerson Daniel 3415

Dry calibration gas flow velocity
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.
Dry-calibration gas flow velocity Equation 5-1:


= 
0
+ 
1


+ 
2


2
+ 
3


3
where
Equation 5-1
V
DryCal
=
dry-calibration gas flow velocity (m/s) (DryCalVel)
V
AvgWtd
=
average weighted gas flow velocity (m/s) (AvgWtdFlowVel)
A
0
=
dry-calibration 0th order coefficient (m/s) (FwdA0 or RevA0)
A
1
=
dry-calibration 1st order coefficient (dimensionless) (FwdA1 or RevA1)
A
2
=
dry-calibration 2nd order coefficient (s/m) (FwdA2 or RevA2)
A
3
=
dry-calibration 3rd order coefficient (s
2
/m
2
) (FwdA3 or RevA3)
Note that the meter provides two sets of dry calibration coefficients - one set for each flow
direction.
NOTICE
Modification of dry calibration parameters is not recommended. The dry calibration
parameters should not be modified unless directed by Daniel personnel.
Dry calibration
1. Select the Calibration|Meter Factors menu.
Configurations
36 3410 Series Gas Ultrasonic Flow meters