- Model 800 Series - Cross Tunnel Flow Monitor

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Tunnel ventilation systems are designed to enable a sufficient through put of air to be maintained to ensure a safe operating environment for users. These systems consume large amounts of power and need to be operated as efficiently as possible. To do this it is necessary to know the effectiveness of the system in terms of air flow and direction developed within the tunnel. Three decades of development, knowledge and practical experience have been utilised to produce the advanced TunnelTech 801 air flow sensor that combines the reliability of ultrasonic technology and delivers superb accuracy and reliability. The TunnelTech 801 has been specifically designed for road, rail and civil tunnel and ventilation shaftapplications and represents the latest in compact ultrasonic sensor-head design. Ultrasonic time-of-flight measurement across any tunnel delivers a highly accurate airflow value and virtually eliminates traditional high-maintenance measurement techniques.

  • Ultrasonic time-of-flight measurement across any tunnel
  • Real-time accurate measurements of air velocity and volumetric airflow
  • Designed to withstand the harshest of tunnel environments
  • Signal output by analogue/relay or RS 485 MODBUS
  • Extremely low maintenance requirements
  • Class leading Accuracy, Repeatability and Resolution

  • Feature : Specification
  • Measurements : Airflow velocity, Volumetric flow, Airflow direction, Temperature
  • Measuring units : Metric or Imperial units for all parameters
  • Accuracy : ±0.1 m/sec*
  • Measurement Technique : Across the tunnel, dual sensor, ultrasonic transit time principle
  • Measurement range (typical) : -40 to +40 m/sec, range is user configurable
  • Construction : Corrosion resistant IP65 / NEMA 4X enclosure (Kynar® 720)
  • Outputs / Comminnucation : RS485 Modbus, RJ45, 2x 4-20 mA, 2 x Form C SPDT relay,
  • Ambient Temperature Range : -40 to +85°C
  • Power : 24 VDC Power Supply

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