Emerson Process Management rosemount 3300 series manual Adjusted

Rosemount 3300 Series

5HIHUHQFH￿0DQXDO

00809-0100-4811, Rev AA October 2002

Figure 6-12. Waveform plot after threshold T2 was adjusted

By adjusting the amplitude threshold T2 the product surface is detected correctly as illustrated in Figure 6-12.

	100			P2	￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿(+￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿250				ADJUSTED
	80	T3
								200
	60
Amplitude	40	T1					T2	150	THRESHOLD
	20
	0							100
	-20
	-40							50	WAVEFORMPLOT
			P1
	-60
								0
	0	100	200	300	400	500		600
				Distance (samples)

To adjust the amplitude thresholds select HART command [1, 4, 6, 2]

or

1.Start the Radar Configuration Tool (RCT).

2.Choose the 'HYLFH￿&RPPDQGV option from the View menu.

3.Open the 'HWDLOV folder.

4.Click the 6HW￿1RPLQDO￿7KUHVKROGV￿option.

The thresholds T2 and T3 should be set to about 50% of the measured signal amplitude for the product surface and the interface peaks, respectively.

127(

Amplitude thresholds should not be set to values less than 3.

127(

Check that the dielectric constant parameter setting is reasonably close to the actual dielectric constant value of the upper product before changing the amplitude thresholds.

127(

Default Amplitude thresholds can be set by typing 0 as the new threshold value.

6-14