Mounting and installation
18
Thermal Mass Flowmeter FMT400-VTS, FMT400-VTCS (Sensyflow VT-S/VT-CS)
42/14-36 EN
4.7
Integrated hot tap fitting for FMT400-VTS (Sensyflow VT-S)
WARNING
Safety instructions
When dismounting, with more than 1.1 bar absolute pressure, or with high temperatures or health-
hazardous gases in the pipe, the use of the exchange tool is recommended and obligatory for safety
reasons.
Non-observance may lead to severe injuries of persons.
Fig. 4-4
Integrated hot tap fitting, wafer flange and weld-in versions
The integrated hot tap fitting is used instead of the pipe component and weld-on adapter assembly described
above if the sensor must be exchangeable during operation with virtually no gas escaping from the system.
It is recommended to use the hot tap fitting for measurements in main conduits (e.g. compressed air systems)
or for measuring points which otherwise require rinsing prior to removing the sensor. As a rule, hot tap fittings
should be preferred for all systems where, otherwise, the entire system or parts of it must be switched off to
replace a sensor.
!
h = 425 mm
Detail B
50
50
A
B
Hub strok
e / mm
20
10
30
40
0 - CLOSE - ZU
50 - OPEN - MESSEN
Detail A
Transducer length h
for weld-in version
is always 425 mm
Wafer flange version – sensor
in exchange position
Weld-in version – sensor
in measuring position
Covers for
DN 25 flange
Indication of sensor position
(50 mm stroke)
O-ring seal
Bottom edge of lock nut
lock nut
Transducer length h for wafer flange version
h = 263 mm for DN 50 and DN 80
h = 425 mm for DN 100, DN 150 and DN 200