• Easy to service, high sensitivity, stability and accuracy
  • Easy zero-point checking, even when visibility is poor
  • A special sample flow concept entirely eliminates the danger of flow cell contamination
  • Easy calibration check with checking rod, even at high dust levels
  • Continuous monitoring of visibility using scattered light principle
  • Dual-beam method
  • Operation via local control unit or central multi-channel control unit
  • Installation in tunnel tube or niche
  • Optional sample heater: Choice of measurement with/without fog compensation

The VisGuard measures the scattered light intensity of a sample drawn into the instrument. Filtered purge air is fed through the flow cell, thus enveloping the sample in a protective shroud of clean air. This effectively keeps the optics clean. Installations are either in the tunnel cavity/niches (in-situ) respectively using extractive sampling away from the cavity. An optional sample heater eliminates the influence of any mist effects.

Nominal range

0 .. 100 PLA (Polystyrol-Latex-Aerosols)
0 .. 3 E/m

Sampletaking

In-situ

Scale ranges

0 .. 15 · 10-3 E/m

Protection

IP65

Sample temperature

-20 .. +50 °C

Sample pressure

max. ±3'000 Pa (±30 mbar)

Interfaces

RS232 or Profibus DP
0/4 .. 20 mA
relay contacts
Control unit

Ambient environment

Temperature range -20 .. +50°C
0 .. 100% r.h.

Maximum service altitude

3,000 m above sea level

Power supply

85 .. 264 V / 47 .. 440 Hz

Lowest measuring range 0-0.05 PLA
Highest measuring range 0-100 PLA
Applications in Brewing Industry
Chemical / Pharmaceutical Industry
Emission Monitoring
Machine and Metal Industry
Oil Mist Detection
Lowest measuring range 0-0.05 mg/m3 PLA
Highest measuring range 0-100 mg/m3 PLA
Applications in Emission Monitoring
Machine and Metal Industry
Petrochemical Industry / Refinery
Ship Industry
Visibility in Railway Tunnel
Lowest measuring range 0-0.05 PLA
Highest measuring range 0-100 PLA
Applications in Railway / Metro
Visibility in Road Tunnel
Lowest measuring range 0-0.05 PLA
Highest measuring range 0-100 PLA
Applications in Road Tunnel
Visibilty & Fire Detection in Road Tunnel
Lowest measuring range 0-0.05 PLA
Highest measuring range 0-100 PLA
Applications in Road Tunnel

 

Industry Measuring Point

Brewing Industry

Dust Concentration in Air

Chemical / Pharmaceutical Industry

Application undisclosed
Dust Concentration in Air

Emission Monitoring

Dust Concentration in Air
Oil Mist Detection

Machine and Metal Industry

Dust Concentration in Air
Oil Mist Detection

Petrochemical Industry / Refinery

Oil Mist Detection

Railway / Metro

Visibility in Railway Tunnel

Road Tunnel

Visibility in Road Tunnel
Visibilty & Fire Detection in Road Tunnel

Ship Industry

Oil Mist Detection