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30 FLOWSIC600 · Technical Information · 8010125 V 4.0 · © SICK AG
Product Description
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Adaptive compensation of one or more path failures
If the self-diagnosis routine implemented in the system detects a path failure, the velocity
value for the failed path will not be used for the calculation of the mean area velocity v
A
. If
this occurs, the following formula will be used to calculate the mean area velocity based on
the measured values applicable for the remaining paths and the stored adapted path
relations.
The system indicates that a path failure is being compensated with the "Check request"
signal. An additional measurement uncertainty of up to 0.35% is tolerated in a four-path
system when it is operating under the meter status "Check request". The volume measured
for that period is stored in the normal volume counters for each flow direction.
Multiple path failure is compensated using the same principle, but the system then oper-
ates under the meter status "Data invalid". The volume measured for that period is stored
in separate error volume counters for each flow direction. This enables gas quantities
transported to be determined despite an increased measurement uncertainty.
bi: Status bit for path i
bi = O: Path inactive
(or failed)
bi = 1: Path active v
A
=
i = 1
N
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·
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i
·
v
Path i
P
Path i
i = 1
N
b
i
·
w
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
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