Siemens SITRANS LUT400, Operating Instructions Manual

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Page 192 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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2.15.3. Basic Setup
2.15.3.1. Method of Flow Calculation
Sets the method of flow calculation.
Set this parameter to Ratiometric only if the primary measuring device
(PMD) supports ratiometric calculations. (Note that Palmer Bowlus Flume
and H-Flume support ratiometric calculations only.) For more details on
Absolute and Ratiometric calculations, see Method of Flow Calculation on
page 268.
2.15.3.2. Flow Exponent
The exponent for the flow calculation formula.
Use this parameter if the PMD is set to Exponential devices. It creates an
exponential curve with end points set by
2.15.3.3.Maximum Head
and
2.15.3.5.Zero Head Offset
and with the curve based on the specified
exponent.
Use the exponent specified by the PMD manufacturer, if available, or
relevant Open Channel Monitoring reference material.
Options
* ABSOLUTE
RATIOMETRIC
Values
Range: -999.000 to 9999.000
Default: 1.550
for flow exponent = 1
Max. Flow
(
2.15.3.4.
)
Ma
x. Head
2.15.3.3.
Zer
o Head
Offset
2.15.3.5.
Zero Flow
Exponents
The exponential equation is:
Q = KH
Flow Exponent (2.15.3.2.)
Where:
Q = flow
K = constant factor
H = head