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4 Dumo Overview
The instrument measures total suspended particles (TSP) in ambient air based on a signal generated from
moving particles. For parameterization and set up, Dumo can be accessed via USB with our DustTool software
(available free of charge on our website at http://www.sintrolproducts.com).
The instrument has a standard 4–20 mA output, which can easily be integrated into existing systems such as a
PLC in the control room. Dumo has "Alert" and "Alarm" signals which correspond to certain dust concentration
levels above the normal levels. By performing the Auto setup feature the normal dust level is determined and
the two "Alert" and "Alarm" levels are defined to factor five and factor 20 of that level. The instrument can
also be calibrated to show mg/m
3
by performing a reference measurement.
The instrument has a built-in fan, which draws in a steady and constant flow of ambient air through the
measuring chamber. Particulate flowing through the chamber will interact with the sensor rod causing a small
electrical charge to pass between the particulate and sensor. The small electric charges provide signals
monitored by the electronics. The generated signals are proportional to ambient dust levels.
The housing is made of aluminum. The measuring probe is stainless steel (316L) and the insulation material is
PTFE, commonly used as a high-performance thermoplastic).
Figure 1 Dumo structure and main parts
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