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A5E33329501
SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
Page 115
mm
mmm
Gener
a
l Oper
at
io
n
H-Flume
•
Sized by maximum depth of flume
•
Approach is preferably rectangular, matching width and depth for distance 3 to 5
times the depth of the flume
•
May be installed in channels under partial submergence (ratio of downstream level
to head). Typical errors are:
• 1% @ 30% submergence
• 3% @ 50% submergence
•
For rated flows under free flow conditions, the head is measured at a point
downstream from the flume entrance. Refer to the following table.
Parameter
Value
2.15.1. Primary Measuring Device (PMD)
H-Flume
Flume height (D)
2.15.3.3. Maximum Head
2.15.3.4. Maximum Flow at 20 mA
2.15.3.7. Flowrate Units
2.15.3.1. Method of Flow Calculation
Ratiometric
Note: H-Flume can only be setup using ratiometric calculations
Flume Size
(Diameter in feet)
Point of Measurement
cm
inches
0.5
5
1.75
0.75
7
2.75
1.0
9
3.75
1.5
14
5.5
continued on next page
Front View
Side View
point of measurement
transducer*
Plan View
flow
* The transducer must be above the maximum head by at least the blanking value (see
).
D
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