Pmds With Exponential Flow To Head Function; Applicable Weir Profiles - Siemens SITRANS LUT400 Series Operating Instructions Manual

PMDs with Exponential Flow to Head function

For Primary Measuring Devices (PMDs) that measure flow by an exponential equation,
use these parameters. Ensure that you use the correct exponent for your PMD; the values
below are samples only.
Standard Weirs
weir profile

Applicable weir profiles

V-notch or
triangular
Parameter
2. 1 5.1. Primary Measuring Device (PMD)
2. 1 5.3.2. Flow Exponent
2. 1 5.3.3. Maximum Head
2. 1 5.3.4. Maximum Flow at 20 mA
2. 1 5.3.7. Flowrate Units
2.2.5. Far Range
2. 1 5.4. 1 . K Factor
a.
Values are samples only. Consult weir manufacturer's documentation for cor-
rect flow exponent.
b.
Required for exponential device absolute calculation only.
Page 100 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
transducer
3 to 4 x h
max
suppressed
rectangular
b
h
cipolleti or
trapezoidal
Value
Exponential Devices
Weir Type
V-notch
Suppressed rectangular
Cipolletti or trapezoidal
Sutro or proportional
sutro or
proportional
a
Value
2.50
1.50
1.50
1.00
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