Filter-Guard 206

Dust Filter Monitoring
Filter-Guard 206


Filter-Guard 206 continuously monitors the clean air side of any fine dust filter installations.
A warning is initiated when a sudden increase in dust concentration is present, i.e. due to breakdown in the filter casing or bag.

Fields of Application

  • Monitoring filter systems
  • Vibrating and jet filter systems
  • Air extraction installations in wood and plastic processing plants
  • Air conditioning units with dust filter systems
  • Paint and varnish production
  • Ambient air monitoring at workplaces
  • and many more


  • Suitable for various types of dust
  • 4-20mA standard output signal
  • LON® interface (optional)
  • Low current consumption
  • Robust aluminium housing
  • Straightforward installation
  • Easy exchange of the sensor elements


Signal horns, warning lamps, warning banners, air control accessories, metering units, plotters, data-logger.
Further accessories can be supplied on request, according to the proposed measurement tasks.

Technical data

Measurement principle: optical light dispersion
Fields of application: filtermonitoring for dry, not sticking, not lumping, not hygroscopic substances
Measurement ranges: 0 – 100 % dust
approx. measurement range:
total dust
0.1 - 20 mg / m3
0.1 - 50 mg / m3
0.1 - 100 mg / m3
dependant on the kind of dust at the measuring point
Medium humidity: dry
Measurement accuracy: pure warning function, no metering unit
Ambient temperature: 14 °F to 122 °F
Response time (t90): < 10 s
Installation: flexible flange for output air channel construction (flat and round channels)
Protection class: IP 54
Output signals: analog output 4 (0)-20 mA
RS 485 / LON®
Voltage supply: 24 V DC
Power consumption: 3 VA
(D x L):
1.97 x 11.8 inch or
1.97 x 23.6 inch (long version)
Weight: approx. 2.09 lbs
Trademark right: EU-patent

Evaluation Units

Multi-channel installations:
MWS 897
MWS 903
LON®-Center 2000
GW 399
Multitronik MC 602

Detectable Types of Dust

Dust types:
Wood dust
Household dust
Colouring pigments
Plastic dust
Flour dust
Metallic dust
Mineral dust
and many more