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1.2 Product overview
Models S304/S305 are linear emission monitors. They are microprocessor-
based, self-adjusting devices equipped with two alarm relays, one 4-20 mA
signal output and RS422 Serial communication.
Their main use is for dust emission monitoring. The units are compact with the
sensor and control units built into an IP65 enclosure, which has been
specifically designed for easy installation and operation. The standard model is
designed for applications at up to 2 bar and 300 °C. A high-temperature (HT)
model is available for temperatures up to 700 °C.
1.3 Principle of operation
The models S304/S305 use proven and reliable triboelectric technology where
the interaction of particles with the sensor rod causes a small electrical charge
to pass between the particulate and sensor.
It is this small electric charge that provides the signal monitored by the
electronics, the signal generated is proportional to the dust level even if
particles accumulate on the sensor. Experience has shown that this method of
monitoring dust level in gasses, offers accurate results with minimum
maintenance.
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