KROHNE Summit 8800 Vol 2 - Manual (Page 93)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 STREAM CONFIGURATION 06
Figure 84 Flow rate limits & scaling
For the limits the following parameters are available:
Qmax The maximum flow is for which the meter has been designed.
Hi Q The maximum limit (in % of Qmax) above which an alarm must be generated
Lo Q The minimum limit (in % of Qmax) below which an alarm must be generated
The scaling factors are used when displaying the flow on the SUMMIT screen. They are typically
meant to be able to display a volume flow as Mm3 instead of m3 or as MMft3 instead of ft3, as
the flow displayed is devided by the factor. Typical values are 1, 1000 and 1000000.
Separate factors are available for Metric and USC units.
The actual flow scaling factors available depend on the metering type at hand. A typical one
would be:
USC volume setting The scaling used when the volume is displayed in USC units on the SUMMIT
screen
6 .4 .2 Liquid flow rate correction
Unlike gas and steam, meters for liquids are used for a wide variety of products. The product
transported may also change during operation. Because the meter correction depends on the
type of product a more elaborate correction scheme is available. Two correction methods are
both performed in the SUMMIT 8800:
Meter factor A correction per type of product
K-factor A correction for the meter. A selection for a single point or multiple points can be
selected. Single point will be used when the meter is considered to be linear and
will often be used as the factor provided by the manufacturer. Multiple points will
be used when the meter is calibrated or proved.
The meter factor and the K-factor may be changed by proving.
See meter correctons for mor details.
6 .4 .2 .1 Meter factor
For Liquid Meter correction an individual Meter Factor can be entered for up to 8 different liquid
products. The default value is 1 (no correction)..
The factor will be determined during proving to correct a fluid flowmeter for the ambient condi-
tions by shifting its curve. Normally, the meter factor should be close to 1.