Reference Manual
00809-0100-4024, Rev BA
September 2005
Rosemount 5600 Series
4-12
Figure 4-3. Spectrum plot for
typical calm conditions
General
Amplitude
Threshold
Echoes with amplitudes below the general amplitude threshold will be
disregarded. Recommended threshold values are:
• Calm conditions: no turbulence, foam or condensation. Set amplitude
threshold to approximately 20% of surface echo amplitude.
• Foam, agitators, or low product DC: the surface echo signal may drop to
200-300 mV during processing in tank. A threshold value of about 150
mV is recommended.
Note:
These figures are estimations. Significantly different figures may have to be
used in many cases.
Some further considerations are:
• If water test is performed before the product enters the tank, there is
probably a difference in signal amplitude between the water and the
product. Use the signal amplitude for the product to set the amplitude
threshold.
• A moving surface may cause a decrease in signal amplitude.
200
200
400
400
600
600
800
800
1000
1000
1200
1200
1400
1400
1600
1600
1800
1800
2000
2000
0
0
1.0
1.0
4.0
4.0
5.0
5.0
6.0
6.0
7.0
7.0
8.0
8.0
9.0
9.0
10.0
10.0
P2 Unknown
P2 Unknown
2.0
2.0
3.0
3.0
56005600_08_AA
.E
P
S
A: General amplitude threshold
B: Amplitude threshold point (ATP)
C: Hold off distance (UNZ)
D: Echo curve
D
A
B
C
Содержание 5600 Series
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