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Figure 2. S305 Emission Monitor
The unit shall be installed in a position, where the gas flow passes the sensor
rod in a 90 angel.
In round cross-section ducts, the unit can be installed in any position above the
horizontal axis (between 9 o’clock and 3 o’clock).
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. In all cases, the tip of the sensor rod
must extend at least 1/3 of the diameter of the duct. Depending on the dust
concentration, the probe length could vary from 1/3 to 2/3 of the duct diameter.
As a rule of thumb: the lower the dust concentration the longer the probe.
If possible the unit shall be installed in a position where the duct pressure is
negative.
If installed downstream an electrostatic precipitator (ESP), the distance from
the ESP should be at least 20 m. Although the sensor (lengths less than 1m)
is not affected by vibration, very high vibration levels should be avoided.
Figure 2a. Round cross-section duct Figure 2b. Square cross-section duct
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