Siemens SITRANS LUT400 Series Operating Instructions Manual page 505

2.15.3. Basic Setup
2.15.3.1. Method of Flow Calculation
Sets the method of flow calculation.
Options
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.
Values
Use this parameter if the PMD is set to Exponential devices. It creates an
exponential curve with end points set by
2. 1 5.3.5.Zero Head Offset
exponent.
for flow exponent = 1
Max. Flow
2. 1 5.3.4.
( )
Zero Flow
Use the exponent specified by the PMD manufacturer, if available, or
relevant Open Channel Monitoring reference material.
Page 192 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
* ABSOLUTE
RATIOMETRIC
Range: -999.000 to 9999.000
Default: 1.550
2.15.3.3.Maximum Head
and with the curve based on the specified
The exponential equation is:
Q = KH
Where:
Q = flow
K = constant factor
H = head
and
Exponents
Flow Exponent (2. 1 5.3.2.)
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