The VisGuard type opacimeter manufactured by Sigrist Photometer, a renown company with more than 50 years experience in the market, is a compact device working according to the principle of light dispersion offering a measuring range of 0 to 0,0015 /m and less.


Range 0 to 15x10-3/m
Output BUS ORNET or SIREL signal 0/4 to 20 mA
  2 relays
Temperature -20ºC to +50ºC
Size 209 x 352 x 234 mm
Protection IP 65
Input 85 to 264 V @ 47 to 440 Hz


  • Easy installation in tunnels, technical stations or niches
  • Continuous monitoring
  • In-situ or aspiration sampling of up to 500 m
  • Local control or multichannel operation for up to 8 opacimeters.
  • Reliable measurement
  • Easy calibration point adjustment and verification
  • Fog compensation by heater


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