KROHNE Summit 8800 Vol 2 - Manual (Page 81)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 STREAM CONFIGURATION 06
6 .2 .3 .1 General
Figure 73 Differential pressure General section
Used Transmitters This is the range of the transmitters to be used in the flow measurement. If
only one DP transmitter is to be used select Hi Range. If two or three ranges
are selected, the user will be prompted with switching values and new items
appear in the list left: Mid (2 or 3 ranges) and Low (if 3 ranges are selected0.
Switch up & down This selection is defined as a percentage of the transmitters range, and
it’s instructions to switch up or down to the next transmitter. Based on the
percentage value of the range, the mid DP transmitter maybe required at a
user entered value to switch up to the high range transmitter or switch down
to the low range transmitter.
Measurement type Select the restriction used in the pipe to create the differential pressure.
Pipe Constants
Dt0
The measurement of the pipe diameter at the reference temperature
t0D The pipe reference temperature of the device when measured
λD Linear expansion coefficient of pipe based on material due to thermal changes
Flow Element Constants
dt0
The diameter of the orifice plate at reference temperature
t0d The reference temperature at the time of the orifice measurement
λd Linear expansion coefficient of the orifice plate material due to thermal
changes
Dynamic Viscosity
Identify the source of viscosity measurement for the fluid. A choice of:
Keypad
Fixed user defined value
Sutherland (pressure) Deriving the dynamic viscosity of fluid as the result of flowing pressure
Polynomial Defining viscosity formulation as a function of temperature
Sutherland The dynamic viscosity as the function of temperature using Sutherlands’s law
Keypad The fixed keypad value
C Sutherland constant
μ0 Viscosity at reference value of fluid
K11-K13 Viscosity constants