5
The best possible installation location should be chosen in applications that cannot fully satisfy the
requirements for the installation location.
The dust sensor must be installed in a metallic duct in order to attain sufficient shielding against
electrical influences.
In case of non-metallic lines, a metal casing, a metal foil or a fine-meshed metal net with a length of
approx. 5 times the pipe diameter must be provided upstream and downstream of the measuring point.
It must also be ensured that the duct and sensor are earthed properly.
1. The ProSens should be installed so that the dust impinges on the sensor rod at an angle of 90°.
2. In horizontal pipes with a round cross-section, the ProSens can be installed in any position above the
horizontal axis (between 9 and 3 o’clock). (See figure 3a)
3. In horizontal pipes with a square cross-section, the installation can be in the centre at the top or side.
(See figure 3b)
4. Even though the sensor function is not impaired by vibration, strong vibrations should be avoided, as
they can lead to destruction of the electronics.
5. The sensor should not be exposed to direct sunlight, or used in area with an ambient temperature of
more than 60 °C.
6. The sensor rod must not come into contact with the opposite pipe wall or any other device!
The
electrodynamic signal would be short-circuited by this. The length of the sensor can be
shortened to a minimum length of 70 mm for this. The plastic sleeve must not on any account be
damaged here.
•
The length of the sensor rod should be minimum 1/3 and maximum 2/3 of the duct diameter.
However, it must always be ensured that contact through bridge formation does not result,
even if deposits form on the inside wall of the pipe.
•
A golden rule: the lower the dust concentration, the longer the rod length.
7. A position downstream of the blower is generally recommended as an installation position for
monitoring a filter system. If the sensor is used downstream of an electric filter, the distance to the
electric filter should be minimum 20 metres. Even though the sensor function is not impaired by
vibrations, very high vibrations over a longer time period should be avoided.
Fig. 3a: Round cross-section
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ProSens in the
horizontal axis.
