Design And Function; Pipe Components - ABB FMT400-VTS Operating Instruction

3 Design and function

FMT400-VTS/-VTCS (Sensyflow VT-S/VT-CS) operates on the thermal principle. This measurement method is
based on the principle that gas flowing around a heated body absorbs heat from that body.The result of this flow-
dependent cooling down process is used as a measurement effect. Since the loss of heat depends on the num-
ber of particles reaching the surface of the heated body, it is possible to determine the mass flow directly. It thus
becomes unnecessary to correct pressure and temperature effects.
The measuring systems consist of only the 2 components:
• detecting element and
• pipe component.
Fig. 3-1 and Fig. 3-2 show a schematic representation of the measuring systems
– FMT400-VTS (process version) and
– FMT400-VTCS (hygienic version).
3.1

Pipe components

Pipe components in process version
Pipe components in process version are available in various types for nominal pipe widths from DN 25 to
DN 200. In addition it is possible to integrate the transducer directly into pipes as of DN 150 or into pipes with
non-circular cross-sections using a weld-on adapter.
Pipe component 1 in
wafer flange design
DN 40 to DN 200
ANSI 1½" to 8"
Fig. 3-1
42/14-36 EN Thermal Mass Flowmeter FMT400-VTS, FMT400-VTCS (Sensyflow VT-S/VT-CS)
FMT400-VTS, Process version
Transducer FMT400-VTS
(1)
(1) Centering pin on outlet side
Design and function
(1)
Pipe component 2 as measuring section
DN 25 to DN 50 / ANSI 1" to 2"
Weld-on adapter from DN 150
(1)
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