Wafer Type Design (Fmt091) And Partial Measuring Section (Fmt092) - ABB SensyMaster FMT230 Commissioning Instruction

26 FMT230, FMT250 THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. B
... 6 Installation

Wafer type design (FMT091) and partial measuring section (FMT092)

1 Flange screw
2 Washer
3 Flange
4 Flange gasket
5 Pipe component
Figure 13: Installing a pipe component (example, wafer type design)
1. Position the pipe component coplanar and centered between
the piping. The flow direction must correspond to the arrow
indicated on the pipe component. The centering pin on the
pipe component must be located on the outflow side (behind
the measuring point).
2. Install gaskets between the sealing surfaces.
Note
For achieve the best measurement results, make sure the
gaskets fit concentrically with the pipe component.
• The inside diameter of the pipe and flange must precisely
match in the wafer type design. Any differences in levels or
edges, or untidy weld seams, will reduce the measuring
accuracy.
• To guarantee that the flow profile is not distorted, the
gaskets must not protrude into the piping.
6 Sensor connection
7 Centering pin, outflow side
8 Nut
3. Use the appropriate screws for the holes.
4. Slightly grease the threaded nuts.
5. Tighten the nuts in a crosswise manner in accordance with
the figure. First tighten the nuts to approx. 50 % of the
maximum torque, then to 80 %, and finally a third time to the
maximum torque.
Note
Torques for screws depend on temperature, pressure, screw and
gasket materials. The relevant applicable regulations must be
taken into consideration.
Figure 14: Tightening sequence for the flange screws