• Early and reliable fire detection in tunnels
  • Measurement principles: Scattered light forward
  • Perfect addition to temperature cables thanks to earlier and faster detection
  • No need for protective measures during tunnel cleaning
  • Immune to gantry fog
  • Visibility (K value) measured according to the scattered light measurement principle
  • IP 6K9K enclosure rating thanks to a rugged stainless-steel housing

  • For the control of ventilation and for filter monitoring in road tunnels
  • Measured values: Visibility (K-value), NO, NO2, NOx, CO, temperature
  • Measurement principles: Differential optical absorption spectroscopy (DOAS), transmittance measurement, electrochemical cell, Resistance thermometer
  • Measuring distance: 10 m
  • Low maintenance requirements due to long maintenance interval (approx. 1 year)

  • The tunnel flow velocity measuring device for long-term operation
  • Measurement principle: Ultrasonic transit time difference measurement
  • Representative measurement across total tunnel width
  • Very reliable measurement, compared with punctual measurement methods
  • Accurate measurement even of very low flow velocities
  • Extremely rugged components made of titanium, stainless steel, or die cast