Metso 3300 Series, Manual

Page: 11 / 26

MANUAL
11
2. InstALLAtIon Manual Series 3300
If the sensor is mounted in a downstream pipe the
mounting point shall be moved away from locations
where an air funnel may be created (c)(d), otherwise it
may be necessary to insert a flow damper just after the
measuring point (f)(g).
If a continuous TCU is wanted even in case the pipe runs
empty, an installation like (h) can be used. The sensor
is mounted at the under side of the horizontal pipe in a
cone, to let air bubbles pass without disturbing the TCU.
Sensor (i) is used to for concentration control in a loop.
The dosing is injected before the sensor, preferably with
a pump between the dosage and the sensor to provide
for mixing before the TCU. The sensor is mounted on the
pressure side of pump to minimize influence from air
bubbles.
It is recommended to install valves so that the sensor
can be removed for service without a shutdown of the
process.
2.6 Mounting the sensor
General rules
The sensor should be mounted at a place where there
will be no occurrence of air pockets or bubbles.
The best installation is obtained across a pump (a) or in
an upstream pipe (b) (e).