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FLOWSIC600 · Technical Information · 8010125 V 4.0 · © SICK AG
Product Description
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2.6.2
Meter states
2.6.2.1
Status: Measurement valid
The meter status "Measurement" is the standard meter status of the FLOWSIC600.
Frequency outputs and current output are updated cyclically and indicate the actual
volume and volume flow rate. In addition, the analog signal can indicate the actual flow
rate, corrected volumetric flow rate, SOS (speed of sound) or VOG (velocity of gas). The
digital output "Direction of flow" is updated in accordance with the direction of the
volumetric flow. The digital output "Measurement valid" (active) represents the status of
the measurement. Positive (forward) and negative (reverse) volumetric flow rates are
integrated and saved in separate internal memory sections.
The MODBUS interface allows the query of all parameters and signals at any time without
interfering with the function of the system.
Each measurement initiated by the system controller includes one full transit time
measurement with, and one against the direction of flow on each path. The result of each
measurement is written to a mean value memory to be used in further calculations. The
size of this memory block and thus the device response delay can be modified through the
parameter in register #3502 "AvgBlockSize". If no result can be calculated due to poor
signal quality, this measurement is registered as an invalid attempt in the mean value
memory. The mean value is formed in a variable averaging process including all valid
measured values in the memory.
If the number of invalid measurements on a path exceeds a predefined limit (Reg. #3514
„Performance“), the measuring system activates the meter status "Check request".
2.6.2.2
Status: Check request
This meter status becomes active if one measuring path has failed and the adaptive path
failure compensation has been activated (
, p.28). The multi-path FLOWSIC600 system
is able to compensate for this failure. Measurement is continued with reduced accuracy
and the volume is still counted in the volume counters. If a path fails while the path failure
compensation is not active, the measuring system will activate the "Data invalid" status.
Moreover the meter status "Check request" becomes active when the system alarms 2002
("No HART communication to temperature transmitter"), 2003 ("No HART communication
to pressure transmitter"), or 2004 ("Maximum pulse output frequency exceeded") become
active (see Technical Informationtable
).
2.6.2.3
Status: Data invalid
If the quality of received signals is deficient in one or more measuring paths or the logbook
is full or the measured value is out of the calibration range, the SPU must mark the
measured value invalid and activate the meter status "Data invalid". The measured volume
is counted in the error volume counter. However, the SPU will cyclically attempt to re-
establish valid measurements. As soon as the signal quality and number of valid
measurements meet the required criteria, the SPU will automatically change back to the
"Measurement valid" or "Check request" status.
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