Product Description
FLOWSIC600 · Technical Information · 8010125 V 4.0 · © SICK AG 25
Subject to change without notice
Correcting the characteristic "as found" calibration curve
The characteristic "as found" curve may be corrected using a factor dependent on the
direction of flow (AF
forward
, AF
reverse
). In addition, a zero offset (ZO) may be entered. A
meter functioning correctly should have a zero offset of 0.
The calculation of the factors is based on the weighted mean error (WME, equivalent to
OIML recommendation no.137-1).
For Q
i
> 0.9 Q
max
a weighted factor of 0.4 should be used instead of 1 (OIML 137-1).
The corresponding factor is then calculated as follows:
The result of the volumetric flow calculation is stored in register #7001 "VolumeFlow".
For further details on correction functions
§ 3 "Flow Calibration".
Q
v, cal
= Q
v, corr
· AF
forward
Q
v, cal
= Q
v, corr
· AF
reverse
Q
i
: Tested flow rate
Q
max
: Tested maximum flow rate
E
i
: Mean error in % established at the tested flow rate
AF
forw.
: Reg. #7037
"AdjustFactorForward"
Default: 1.0
AF
rev.
: Reg. #7038
"AdjustFactorReverse"
Default: 1.0
WME =
i = 1
n
k
i
• E
i
i = 1
n
k
i
where k
i
=
Q
i
Q
max
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