KROHNE Summit 8800 Vol 2 - Manual (Page 89)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 STREAM CONFIGURATION 06
6 .2 .4 .3 Pulse Input API 5 .5 Level A
Define the preference for serial or pulse input and the pulse input setting for API 5.5 level A if
used
Figure 80 Coriolis pulse input section for API 5 .5 level A
Primary measurement This option defines whether the serial link or the pulses will be used as a
primary measurement. The other will be used when the primary fails. Off
course only one of them can be used also: the other will not be connected..
Frequency method Defines if the pulse corresponds with mass or volume. Though all Coriolis
meters measure mass, they can also calculate the volume. Though less
accurate, some users prefer this as their company
Impulse factor The K-factor or impulse factor for the HF pulse. The total number of pulses
corresponding to one unit of flow.
Frequency input API 5.5 level A.
Dual frequency deviation The threshold value (+/-) for the deviation of the two frequencies above
which an alarm is raised.
Dual frequency pulse limit Used to monitor pulse fidelity to alarm an added or missing pulse caused by
electrical transients and electronic failures. This monitoring function allows
the user to reduce the flowmeter uncertainty factors.
Dual frequency pulse
interval
The time between pulses sequences. This is the maximum allowable time
for pulse limits before an alarm is activated.
Dual frequency failure
limit
Lack of continual pulses before the meter is deemed failed and raises an
alarm
Dual frequency direction
change
Number of pulses allowed in opposite flow to determine the direction of the
medium flowing in the meter.
Dual frequency min.
frequency
Low cut-off frequency. This is frequency below which the flow will be
considered 0.