Siemens SITRANS LUT400 Operating Instructions Manual page 123

H-Flume
transducer*
Plan View
Front View
* The transducer must be above the maximum head by at least the blanking value (see
Range
).
Parameter
2.15. 1 . Primary Measuring Device (PMD)
2.15.4. PMD Dimensions
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
Note: H-Flume can only be setup using ratiometric calculations
• 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.
Flume Size
(Diameter in feet)
0.75
A5E33329501
flow
point of measurement
Side View
D
0.5
1.0
1.5
SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
Value
H-Flume
Flume height (D)
Ratiometric
Point of Measurement
cm
5
7
9
14
continued on next page
2.2.4. Near
inches
1.75
2.75
3.75
5.5
Page 115