Справочник Пользователя для Siemens SITRANS FUS1010 NEMA-4X/ IP 65
7-5
1010NFM-3J
Section 7
Siemens 2 Channel [1] Channel 1
Key Install to start flow measurement
Install Xdcr
Transducer Model
190
Transducer Size
191
Flow Range GAL/MIN
6.71
Install Completed?
Yes
Spectra Graph
No
7.9
THE SPECTRA DISPLAY SCREEN
The Spectra Graph provides a powerful tool to determine if the installation has achieved an adequate
margin of operation. It also eliminates the possible effects of mechanical vibration and external RFI
(Radio Frequency Interference). Mechanical vibration and external RFI can cause other types of Dop-
pler flowmeters to be inaccurate. The Spectra Graph screen provides keypad control keys that allow
adjustments of application dependent parameters, if required, while observing the results of these
adjustments. Application dependent parameters are the Low and High Limit Cursors and the Noise
Cursor. In most cases, only the Noise Cursor will be required to be adjusted.
margin of operation. It also eliminates the possible effects of mechanical vibration and external RFI
(Radio Frequency Interference). Mechanical vibration and external RFI can cause other types of Dop-
pler flowmeters to be inaccurate. The Spectra Graph screen provides keypad control keys that allow
adjustments of application dependent parameters, if required, while observing the results of these
adjustments. Application dependent parameters are the Low and High Limit Cursors and the Noise
Cursor. In most cases, only the Noise Cursor will be required to be adjusted.
To display the Spectra Graph, position the highlight over Spectra Graph and use the <Right and Down
Arrows> to select [Yes].
Arrows> to select [Yes].
The Spectra Graph display shows the results of the Fast Fourier Transform (FFT) performed by the
flow computer. The horizontal scale represents flow velocity with the higher velocities on the right and
lower velocities on the left. The vertical axis is relative amplitude or magnitude; each bar shows the
relative amplitude for a velocity range. 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.
flow computer. The horizontal scale represents flow velocity with the higher velocities on the right and
lower velocities on the left. The vertical axis is relative amplitude or magnitude; each bar shows the
relative amplitude for a velocity range. 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.
EXAMPLE OF A SPECTRA DISPLAY SCREEN
Meter Type
Measurement
Channel
Channel
Site name
High Limit
Cursor
Cursor
Flow Velocity Range
Noise Level
Set Cursor
Set Cursor
Low
Limit
Cursor
Signal
Amplitude
Amplitude
Siemens
Meter Type
Signal
Amplitude
Measurement
Channel
Channel
Site Name
High Limit
Cursor
Cursor
Flow Velocity Range
Low Limit
Cursor
Noise Level
Set Cursor