Siemens 7ME3510, Руководство по эксплуатации, Страница: 112 / 214

Functions
7.11 Reflexor
FUP1010 IP67 Portable
110
Operating Instructions, 03/2012, A5E02951522-02
The reported flow rate is the mean value of the included Spectra Graph bars. It is computed
by excluding signals that are lower (to the left of) than the Low Limit Cursor or higher (to the
right of) than the High Flow Cursor or lower (under) than the Noise Cursor.
Spectra Graph Cursor Use
Table 7- 11 Cursor Definitions
Cursor Definitions
High Limit Cursor This cursor appears as a vertical line on the right
side of the Spectra Graph. All signals to the right
of this line will be excluded from the flow
calculation. Use this adjustment if the right side of
the Spectra Graph has noise that is larger in
amplitude than the signal that is produced by
flow. The cursor may be arbitrarily placed at two
times the maximum flow expected.
Low Limit Cursor This cursor appears as a vertical line on the left
side of the Spectra Graph. All signals to the left of
this line will be excluded from the flow calculation.
Use this adjustment if the left side of the Spectra
Graph has noise that is larger in amplitude than
the signal that is produced by flow. The cursor
may be arbitrarily placed at one half the minimum
flow expected.
Noise Level Set Cursor This cursor appears as a horizontal line on the
Spectra Graph. All signals below this line will be
excluded from the flow calculation. Position the
cursor approximately one quarter the height of
the FFT peak.
Using Spectra Graph Data and Controls
When the Spectra Graph is first displayed:
●
The data shown on the top highlighted line shows Velocity in feet-per-second (F/S) on the
left side.
● The volumetric Flow Rate in the current rate units is displayed on the right side.
You can scroll the data shown by pressing the <Up and Down> Arrows.
1.
Pressing the <Up Arrow> changes the data in the highlight to [Diagnostic Data]
containing, from left to right: (Hz) Doppler shift frequency in Hertz, (mV) Signal Amplitude
in millivolts, (FFT Pk) Peak FFT magnitude and (%D) FFT Percent Deviation. Carefully
inspect the data for Signal Amplitude and Percent Deviation. Refer to the "Available
Adjustments to Spectra Graph" table and the "Reflexor Diagnostic Data" table in this
section for details. Press the <Down Arrow> to return to [Velocity].
2. Press the <Down Arrow> from Flow Velocity in feet per second (F/S) to advance to the
Noise Level Set cursor control. A numeric indication of the Noise Level Cursor position is
provided in the highlighted area. Refer to the "Available Adjustments To Spectra Graph"
table for details.