MultiRanger 200 and Flow Configuration AG040303 9 of 10
APPLICATION GUIDE
Section 6.1 BS-3680/ISO 4359 Rectangular Flume Flow Calculation Table
Parameter #
Description Priority
Configuration Priority
P600 Set to 6 (BS 3680/ISO 4359 Rectangular Flume) Must be configured.
P602 = (1 – 6) Enter the values of B, b, p & L in indices 1 to 4 respectively. In
indices 5 and 6 you can view calculated values of C
v
and C
d
respectively
Must be configured.
P605 Zero Head Off-set Must be configured due to hump height of the
flume.
P608 Flow rate units Must be configured.
P607 Flow rate decimal is configured. Optional, configured to display the flow rate (Q).
Factory set to 2.
P620 Low flow cut-off (Its optional), to avoid totalizing at flows below
this set level.
Optional, to avoid totalizing at flows below this set
level.
P621 Auto zero head calibration (its optional), configured if head
displayed has constant off-set.
Optional, configured if displayed head has constant
off-set.
Section 7.0 BS-3680/ISO 1438 Thin plate V notch (P600 = 7)
To calculate the flow rate this method requires only the angle of the weir notch () in degrees.
Section 7.1 BS-3680/ISO 1438 Thin plate V Notch Flow Calculation
The MultiRanger 200 calculates flow rate (Q) based on Absolute calculation method confirming to BS 3680 Part 4A standard for
thin plate weirs using the following equation:
Q = C
e
x (8/15) x tan(/2) x (2g)
0.5
x (h)
2.5
Value Table
Q Flow rate calculated and displayed by MultiRanger 200. The units will not be displayed and user must
know the measurement units used (liters/sec. or gallons/min. etc.).
Weir notch angle in degrees
g Acceleration due to gravity
C
e
Discharge coefficient and is a function of weir notch angle .
h Head measured by the ultrasonic head, or any other level measuring device, mounted upstream from
the open channel measuring device. IMPORTANT: set in the same units selected in P005.
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