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3 Design and function
The mass flowmeter works according to the thermal measuring principle of a hot-film anemometer. Heat is with-
drawn from a heated body by a gas circulating around it. This flow-dependent cooling is utilized as measuring
effect. Since the heat loss depends on the number of particles that hit the surface of the heated body, it is pos-
sible to directly determine the mass of flow. Thus omitting the need for a correction of pressure and temperature
influences.
The calibration of the devices is done on a highly precise flow test machine with air as calibration medium. For
standard biogas applications, the calibration data are subsequently converted, based on a medium gas compo-
sition of 53 Vol% methane, 45 Vol% carbon dioxide and 2 Vol% air. Devices for applications that clearly deviate
from this gas composition must be ordered with a special calibration for biogas. In this case, the exact gas com-
position is to be specified with the order.
The measuring systems FMT200-D consist of only the 2 components:
• transducer and
• pipe component.
3.1
Pipe components
Pipe components are available in various types for nominal pipe widths from 1 ... 3". In addition it is possible to
integrate the transducer directly into pipes as of DN 100 ... DN 250 (4 ... 10") or into pipes with non-circular
cross-sections using a weld-on adapter.
Flange DN
on both sides
F
External
thread
R
Nominal size
A
1"
550 (21,65")
1½"
820 (32,28")
2"
1080 (42,52")
3"
1600 (62,99")
42/14-37 EN
Thermal Mass Flowmeter FMT200-D (Sensyflow D)
Pipe components
Direction of flow
L1
A
L1
410 (16,14")
615 (24,21")
810 (31,89")
1200 (47,24")
Ø D interior
27,3 (1,07")
R1":
41,9 (1,65")
R1½":
53,9 (2,12")
R2":
79,9 (3,15")
R3":
Design and function
Transducer
125 (4,92")
Rd 52 x 1/6"
Centre of
pipe component
Direction of flow
Thread R
33,7 × 1,2
DN 25: 115 (4,53")
48,3 × 3,2
DN 40: 150 (5,91")
60,3 × 3,2
DN 50: 165 (6,50")
88,9 × 4,5
DN 80: 200 (7,87")
Z-189371
Flange F
9
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