22
CIRWATT B 400
Instruction Manual
2�29�3 - SEALS
The
CIRWATT Type B
can be protected using the following seals:
Sealable button
Wire cover lid seal
Manufacturer seal
(under the thread cover)
Seal transformation relations /
programming
Figure 2:Seals�
2�30 - MEASUREMENT VALIDATION CRITERIA
The energy, maximeter and excess power records will be invalidated if a series of events occur that
indicate that any of their values have been altered. In the specific case of load curve records, there is an
invalidity bit (IV) that indicates that this record is not valid. Events that generate invalid measurements
are classified as follows:
2�30�1 - TIME SYNCHRONISATION WITH DRIFT > T1 = 30 SECONDS
The 15-minute period in which the synchronism event has occurred will not be taken into account for
the power calculation.
2�30�2 - TIME SYNCHRONISATION WITH DRIFT > 10 MINUTES
The measurement is invalidated, i.e. qualifier IV = 1.
2�30�3 - COMMUNICATIONS FAILURE BETWEEN METER AND ANALYSER
If the communication failure coincides with the change of the 15-minute time period and it lasts more
than 30 seconds, the affected periods will not be taken into account for the power calculation.
If the communication failure coincides with the change of the hourly time period and it lasts more than
10 minutes, the measurement in the affected periods will be invalidated, i.e. the qualifier IV = 1.
