Levelflex M FMP40 - Process Centre Of Excellence.

Levelflex M FMP40 with HART/4...20 mA Commissioning
Evaluation of the measurement:
• The map must correspond to the course of the envelope curve (for rod probes up to approx. 5 cm
and for rope probes up to approx. 25 cm before the end of the probe) when the tank is empty.
• Amplitudes in the differential curve should be at a level of 0 mV when the tank is empty and lie
within the span that is specified by the probe-specific blocking distances. In order to not detect
any interference echoes, there must be no signals that exceed the echo threshold when the tank
is empty.
• For partially-filled tanks, the map may only differ from the envelope curve at the position of the
level echo. The level signal is then detected unequivocally as a positive signal in the differential
curve. For detecting the level echo, the amplitude must lie above the echo threshold.
[mV]
400.00
300.00
200.00
100.00
0.00
-100.00
-200.00
-300.00
-400.00
-500.00
0.00
Launch pulse
F
0.20
0.40
Negative
probe end signal
0.60
[mV]
400.00
300.00
200.00
100.00
0.00
-100.00
-200.00
-300.00
-400.00
-500.00
0.00
6.8.3 User-specific applications (operation)
0.80
Envelope curve
L00-FMP40xxx-05-00-00-en-025
For details of setting the parameters of user-specific applications, see separate documentation
BA245F/00/en - description of the instrument functions of the Levelflex M.
Endress + Hauser 73
E
F
(1.00 m, -143.00 mV)
0.20
LN
1.00
[m]
0.40
0.60
[mV]
400.00
300.00
200.00
100.00
0.00
-100.00
-200.00
-300.00
-400.00
-500.00
0.00
0.80
F
0.20
E
(0.98 m, 0.00 mV)
Differential curve = Envelope curve Mapping
LN
1.00
0.40
[m]
0.60
Mapping
0.80
E
(0.99 m, -137.94 mV)
LN
1.00
[m]