Endress+Hauser Silometer FMC 672 Z, Инструкция по установке и эксплуатации

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8 Other Applications
This chapter describes the configuration of the Silometer FMC 672 Z/677 Z for operating
modes 3 and 5. Density measurement, mode 4, is not described as Deltapilot sensors
are required, see BA 060, Silometer FMB 672 Z/677 Z. The applications described are:
•
Differential level measurement
•
Level measurement with a reference probe
Operating mode 3 Differential level measurements are carried out in operating mode 3. A schematic
diagram of the signal processing in this mode is shown in Fig. 8.1.
Operating mode 5 Operating mode 5, see Fig. 8.2, provides a reference measurement at channel 2 which
is used to correct the level measurement at channel 1.
frequency
H2
H1
V2
V1
level
analog
digital
current
voltage
sens. [Hz/pF] offset [Hz]
offset [pF] sens. [pF/cm]
range upper limit
V2
range lower limit
V1
electronic-
insert
electronic-
insert
capacit. level
capacit.
frequency
H2
H1
analog
digital
current
voltage
sens. [Hz/pF] offset [Hz]
offset [pF] sens. [pF/cm]
range upper limit
V2
range lower limit
V1
electronic-
insert
electronic-
insert
capacit. level
capacit.
volume
D = F2-F1
frequency 1
level 1 volume 1
frequency 2
level 2 volume 2
BA064E41
Fig. 8.1:
Schematic diagram of differential
level measurement
frequency
H2
H1
V2
V1
level
analog
digital
current
voltage
sens. [Hz/pF] offset [Hz]
offset [pF] sens. [pF/cm]
range upper limit
V2
range lower limit
V1
electronic-
insert
electronic-
insert
capacit.
level
capacit.
frequency
H2
H1
analog
digital
current
voltage
sens. [Hz/pF] offset [Hz]
offset [pF] sens. [pF/cm]
range upper limit
V2
range lower limit
V1
electronic-
insert
electronic-
insert
capacit.
level
capacit.
volume
frequency 1
level 1
volume
correction factor
frequency 2
BA064E42
Fig. 8.2:
Schematic diagram of level
measurement with reference
probe
Silometer FMC 672 Z/677 Z Chapter 8: Other Applications
41