Base Correction Of The Gas Meter - RMG USZ 08 series Operating Instructions Manual

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Base correction of the gas meter

Polynomial
The base correction of the meter is performed via a quartic polynomial which reproduces the error
curve.
Error equation:
F =
1
v =
wr
A =
n
The constants A
velocity v . Instead of the constant meter factor K
wr
further calculation.
Error curve linearization of the gas meter
Polynomial
The error curve linearization is also performed via a quartic polynomial which represents the error
curve of the gas meter.
Error equation:
F =
2
Q =
m
B =
n
The constants B
rate Q . In order to further calculate the corrected flow rate at measurement conditions, the
mi
correction factor of error curve linearization K
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Manual USZ 08 · EN05 · 2015-06
 v
F = A + A
-2
1 -2 wr
Deviation of the error curve
Weighted flow velocity
corrected by Reynolds number
Constants
(n = -2 to n = 2) are calculated from the measured value pairs Error F
n
 (1+F
K = K /100)
Vc V 1
 Q
F = B + B
-2
2 -2 m
Deviation of the error curve
Flow rate at measurement conditions
Constants
(n = -2 to n = 2) are calculated from the measured value pairs Error F
n
K = (1+F /100)
c 2
 v  v
+ A + A + A
-1
-1 wr 0 1 wr
(%)
(m/s)
, the corrected meter factor K
V
 Q  Q
+ B + B + B
-1
-1 m 0 1 m
(%)
(m /h)
3
is used.
c
INTRODUCTION
 v
2
2 wr
1i
is used for
Vc
 Q
2
2 m
2i
11
and flow
and flow