Siemens SITRANS FUS1010 NEMA-4X/ IP 65 manual Cursor USE on the Spectra Graph

Section 7 1010NFM-3J

7.10CURSOR USE ON THE SPECTRA GRAPH

CURSOR	USAGE TIPS
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 sig-
	nals below this line will be excluded from the flow calculation. Position
	the cursor approximately one quarter the height of the FFT peak.

7.11HOW TO USE SPECTRA GRAPH DATA AND CONTROLS

When you first access the Spectra Graph, the data shown on the top highlighted line shows Velocity in feet-per-second (F/S) on the left side and the volumetric Flow Rate in the current rate units on the right side. You can scroll the data shown using the <Up and Down> Arrows.

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 Per- cent Deviation. Refer to the “Available Adjustments to Spectra Graph” table in paragraph 7.12 and the “Reflexor Diagnostic Data” table found in paragraph 7.13. Press the <Down Arrow> to return to Veloc- ity.

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 found in paragraph 7.12.

Adjust the Noise Level cursor, if required, by pressing the <+> key to increase or <-> key to decrease.

NOTE: A delay in response to all keys will occur. This is due to the longer periodic sampling of the keyboard by the processor while performing FFT’s.

Press the <Down Arrow> from Noise Level to advance to the High Limit cursor control. The <+> and <-> key are active in this position. Refer to the “Available Adjustments To Spectra Graph” table found in paragraph 7.12.

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