Siemens MultiRanger 200 Application Manual page 6

Section 4.0 Universal Linear Flow Calculation (P600 = 4)
The MultiRanger 200 uses polynomial function routines to generate a linear curve fitting between the discrete data points (also
called break points) entered by the user. A maximum of 32 data points each for head and corresponding flow discharge in the
secondary indices of P610 (Head breakpoints) and P611 (Flow breakpoints) can be defined. With maximum head value defined in
P603 and corresponding maximum flow value defined in P604, a total of 33 discrete points are available to the MultiRanger 200 for
flow rate calculation. Use as many data points as possible where flow variations are maximum for increased accuracy.
Section 4.1 Universal Linear Flow Calculation Equation
The MultiRanger 200 calculates flow rate (Q) based on Ratiometric calculation method using the following equation:
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.).
Q Maximum flow (at maximum head H
max
as a standalone number with no units indicated. User must know measurement units used.
For example, if maximum flow is 1000 LPS then P604 = 1000 and P606 = seconds.
H Maximum Head H
max
as span configured in P007. The units are defined in P005.
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.
f(H) Calculated by MultiRanger 200 using polynomial function.
Section 4.2 Universal Linear Flow Calculation Configuration Table
Parameter #
P600
P603
P604
P606
P610 (Secondary
Indices 1 – 32
max)
P611 (Secondary
Indices 1 – 32
max)
P605
P607
MultiRanger 200 and Flow Configuration
Q = Q
as configured in P603. Its value is provided by the user. Generally the same value
max
Description
Set to 4 (universal linear flow calculation)
Enter the value of H
max.
Enter the value of Q
max.
Time units
Sequentially enter from lowest head value in break
point 1 (generally 0) and gradually increase up to
maximum 32 head break points. The units are as set in
P005.
Sequentially enter corresponding flow values for
above head break points. Start from lowest flow value
in break point 1 (generally 0) and gradually increase
up to maximum 32 flow break points. The time units
are as set in P606.
Zero head off-set
Flow rate decimal
x f(H)/f(H )
max max
Value Table
) as configured in P604. Its value is user provided, and is shown
max
AG040303
APPLICATION GUIDE
Configuration Priority
Must be configured.
Must be configured.
Must be configured.
Must be configured.
Must be configured.
Must be configured.
Optional, configure only when the
actual zero is above channel zero.
Optional, configured to display the
flow rate (Q). Factory set to 2
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