Operating Instructions
5
In some applications a compromise has to be made and the sensor will have to be fitted in a position that
satisfies the majority of above requirements.
The sensor has to be attached to metal ductwork so that it will be electrically shielded from interference and
be provided with good grounding. For non-metal ducts, a section of the duct, a minimum of 5 x diameters in
length, should be covered with a metallic foil or fine-mesh on the periphery of the duct.
Caution, ensure good grounding practice are adhered to.
1. The unit should be installed in a position, where the gas flow passes the sensor rod at an angle of 90°.
2. In round cross-section ducts the unit can be installed in any position above the horizontal axis
(between 9 and 3 o’clock). (See figure 2a)
3. For square cross-section ducts, the unit must be positioned in the middle of the top or in the middle of
one of the sides. (See figure 2b)
4. Although the sensor is not affected by vibration, very high vibration levels should be avoided.
5. The units should not be installed in direct sunlight or in areas where the ambient temperature is above
60 °C.
6. The sensor rod must not contact the opposite duct wall or any other obstacle inside the duct!
The sensor can be shortened to a minimum length of 70 mm. Be careful not to damage the plastic cap
when doing this.
•
The recommended length of the antenna is the pipe diameter minus 10 mm, ensuring there is no
contact with the opposite wall.
•
The minimum length of the antenna is 1/3 of the pipe diameter, the smaller the dust burden, the
longer the antenna should be.
7. When monitoring an electrical filter system, the minimum distance from the filter is 20 m.
Although vibration does affect the measurement, the sensor should not be subjected to excessive
vibration for long periods of time.
Fig. 3a: Round cross section
▼
▼
ProSens in the
horizontal axis.
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