Emerson Rosemount 3308, Справочное руководство

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Reference Manual
00809-XXXX-4811, Rev AA
February 2012
7-13
Rosemount 3308
PRELIMINARY
By adjusting the amplitude threshold T2 the product surface is detected
correctly as illustrated in Figure 7-12.
Figure 7-12. Waveform plot after
threshold T2 was adjusted
To adjust the amplitude thresholds select HART command [1, 4, 5, 3]
or
1. Start the Radar Configuration Tool (RCT).
2. Choose the
Device Commands option from the View menu.
3. Open the Details folder.
4. Click the Set Nominal Thresholds 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.
NOTE
Amplitude thresholds should not be set to values less than 3.
NOTE
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.
NOTE
Default Amplitude thresholds can be set by typing 0 as the new threshold
value.
P1
P2
T1
T2
T3
Amplitude
100
80
60
-60
40
-40
20
-20
0
100
50
0
150
200
250
After T2 is adjusted the product
surface is correctly detected