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FTM 30 DR, FTM 31 DR, FTM 32 DR
2.3 Function
The symmetrical vibrating fork is excited to its resonant frequency. When the fork is
covered by material, the vibrations are damped.
The tip of the fork is especially sensitive and makes it ideal for the limit detection of
materials that have a very low bulk density.
In contrast, the base of the fork is very insensitive and is therefore unaffected by
material build-up on the vessel walls.
The signal of the sensor is converted into a switching signal by the electronic insert in
the separate housing.
Soliphant can be operated in both minimum or maximum fail-safe mode, i.e. the
electronic switch opens or the relay de-energises when the minimum or maximum
level is reached, on fault or on power failure.
Max.
Min.
U
Endress+Hauser
Electronic inserts
SPDT
FEM 44
FEM 41
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
5
4
DPDT
FEM 45
1
2
3
7
8
9
1
2
3
7
8
9
1
2
3
7
8
9
1
2
3
7
8
9
1
2
3
7
8
9
2 Usage
Fig. 2
The function of the electronic
switch or relay depends on the
level and fail-safe mode
7
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