Siemens SITRANS F Series Operating Instructions Manual page 90

Diagnostics and Troubleshooting
9.2 Built-in functions
The insulation test can be enabled/disabled with register "Insulation Test".
When the insulation test is enabled the test starts immediately. All following insulation tests will
start at 00:00:00 (midnight).
Duration of insulation test is 2 min 42 sec (1024 samples @ 6.25 Hz)
Insulation test will always be made with an excitation frequency of 6.25 Hz.
Note
For firmware versions < 3.07: The insulation test cannot be enabled in the basic versions of
MAG 8000 and MAG 8000 CT.
Coil-current test
When H-bridge is turned and just before making samples (4 times each measurement), the coil
current is checked via a comparator. If the coil current is not settled, a failure is reported.
During coil current failure the flow value is forced zero.
Amplifier test
Overload is possible both from the AD conversion of sensor signal and from the pre-amplifier.
These checks are made at each sample and if one of the sample fails with an overload, this
measurement is cancelled and a failure is reported.
During overload detection the coil current is held OFF and the flow value is forced zero.
Checking facilities
The MAG 8000 and MAG 8000 CT are equipped with checking facilities of types P, I, and N. (in
OIML R49). The automatic checks are performed without operator intervention.
Type P permanent checking facilities are automatic checks performed constantly during meter
operation. They include:
● Coil current test
● Amplifier test
● Empty pipe test
● Flow overload
● Pulse overload
Type I intermittent checking facilities are automatic checks performed at certain time intervals
or per fixed number of measurements. They include:
● Checksum calculation (10 min. interval on totalizer checksum)
● Insulation test (minimum 24 hour interval)
● Battery capacity check (4 hours interval)
Type N non-automatic checking facilities are checks that are not performed automatically
including all other diagnosis functions in the MAG 8000 and the MAG 8000 CT.
90
SITRANS FM MAG 8000
Operating Instructions, 03/2020, A5E03071515-AH