A5E32337695 SITRANS Probe LU (HART) – OPERATING INSTRUCTIONS Page 41
Parameters
Flow breakpoints
Each segment defined by the head breakpoints (P054) requires a corresponding flow
value, so that SITRANS Probe LU can make the head-to-flow calculations.
Use the Flow Tables associated with your open channel device (Parshall flume, v-notch
weir, or other measuring device) to calculate the flow rate for each head breakpoint.
Enter a flow value for each breakpoint defined in P054. (See illustrated example for Head
Breakpoints on page 39.)
1. P050 must be set to 9.
2. Select P055.
3. The empty breakpoint value field appears, with the breakpoint number in the
auxiliary reading field.
4. Press DISPLAY twice to focus control on the secondary index
1
(the auxiliary
reading field goes blank).
5. Key in 1 and press ENTER .
6. Key in the flow value for breakpoint 1, and press ENTER .
7. Press the UP ARROW key to display 02 in the auxiliary reading.
8. Key in the flow value for breakpoint 2, and press ENTER .
9. Repeat steps 7 and 8 until flow values have been entered for all the required
breakpoints.
10. Press DISPLAY twice and use the ARROW keys or enter the value for the next
desired parameter.
Primary Index
P055
Secondary Index
Breakpoint number
Values
Range 0.0000 to 99999 in units
Default 0.0000
Related Parameters
P054 Head Breakpoints
1.
For more details on secondary index operation, see page 30.
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