Valmet Valmet MCA, Installation & Owner'S Manual, Page: 19 / 66

3.4. Mounting dimensions
Valmet MCA-F
The fork-type Valmet MCA-F sensor is installed in a
process coupling welded onto the side of the process
pipe in such a way that the probe antenna is directed
against the direction of the flow (Fig. 11). The sensor
is loosely tightened into place with mounting clamps
and then approximately aligned with the pipe based on
the position of the electronics casing. After aligning,
tighten the mounting clamps to their final tightness. The
sticker on the electronics casing indicates the installa-
tion direction in relation to the direction of flow.
NOTE: The probe antenna on the end of the sensor is
ceramic, so avoid denting it.
Valmet MCA-FT
When installed, the flow-through sensor replaces the
corresponding length of process pipe (Fig. 12). The
sticker on the electronics casing indicates the installa-
tion direction in relation to the direction of flow. The
sensors do not include flanges, but rather they are
tightened with stud bolts between flanges mounted on
the process pipe.
6.14"
156
4.69"
119
8.27"
210
min. 500 mm (20")
FLOW
Fig. 11. Valmet MCA-F Mounting dimensions.
L
MIN. 500 mm (20")
Fig. 12. Valmet MCA-FT Mounting dimensions.
3.5. MCA-F process coupling
Installing the process coupling:
– Make a 71 mm hole in the flow pipe in line with the
sensor.
– If necessary, shape the process coupling (curvature
radius of installation surface) to the shape of the
pipe.
– Align the process coupling with the hole and weld
and weld four adhesion welds around the seam.
– Weld a continuous weld around the seam.
When process pressure is over 10 bar and/or there
is exceptionally strong vibration, the mounting of the
process coupling should be reinforced with a reinforcing
ring. The area where the deflectors are inserted should
also be reinforced in the same way.
In Fig. 14:
D = inside diameter of pipe
s = wall thickness of pipe
lo = width of reinforcing ring
h = thickness of reinforcing ring
Note that if the pipe wall is thicker than what is indic-
ated in the table, the thickness of the reinforcing ring
can be reduced correspondingly.
4
weld
FLOW
22
90
79
71
90°
± 0.5
Fig. 13. Installation of process coupling.
h
Io
s
min.
6mm
D s p max. T max. h lo
mm mm bar °C mm mm
250 4 25 100 5 32
400 6 25 100 5 50
500 7 25 100 6 60
Fig. 14. Reinforcing the process coupling.
Installation & Owner’s manual OUL00298 V2.3 EN 19 Valmet Mircowave Consistency Transmitter