Siemens sitrans PROBE LU Instruction Manual

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Page 36 SITRANS Probe LU ñ INSTRUCTION MANUAL 7ML19985HT01ParametersHead BreakpointsWhen measuring flow in an open channel device, you can define the cross-section of thechannel as a series of segments. In P054 you assign a head value to each breakpoint. InP055 you assign a corresponding flow value to each breakpoint.Enter up to 11 head breakpoints, where the corresponding flow is known. The 100% and0% levels must be entered. The breakpoints can be ordered from top to bottom, or thereverse.1. First set P050 to 9.2. Select P054.3. The default breakpoint value appears, withthe breakpoint number in the auxiliaryreading.4. Press DISPLAY twice to focus control on the secondary index 1 (the auxiliaryreading field goes blank).5. Key in 1 and press ENTER .6. Key in the head value for breakpoint 1, and press ENTER . (Use units defined inP005.)7. Press the UP ARROW key to display 02 in the auxiliary reading.8. Key in the head value for breakpoint 2, and press ENTER .9. Repeat steps 7 and 8 until head values have been entered for all the requiredbreakpoints.10. Press DISPLAY twice and use the UP ARROW key to go to P055.Example: v-notch weir:Primary Index P054Secondary Index Breakpoint numberValues Range 0.0000 to 99999 in units (P005)Default 0.000Related Parameters P055 Flow Breakpoints1. For more details on secondary index operation, see page 27.Note: Illustrated values for P054 and P055 are for example purposes only.breakpointvalue fieldbreakpointnumber4Breakpoints32Break-pointHead(P054)Flow(P055)4 0.4 m 113.53 0.3 m 55.32 0.2 m 20.071 0 m 01flow characterization4213421 3headflow