smart/ECS Multi Gas Sensor

Gas monitoring

Gas monitoring is used to control the tunnel ventilation at normal operation. If and with how much power artificial ventilation by jet fans is operated depends on the measured visibility and gas concentration. Electrochemical gas sensor cells induce currents proportional to the prevailing gas concentration.

Air is fed into an electrochemical gas sensor by a capillary. The CO gas reacts at the sensor’s sensing electrode and a current proportional to the gas concentration is generated.

With these currents and the measured temperature, the gas sensor modules calculate the gas concentrations.

The gas sensor modules can be recalibrated with zero and reference gas to compensate long term drift.

Request quotation

Would you like to request a quote for any of our products or services?

Please click below and leave your details. We will contact you as soon as possible.


smart/ECS Multi Gas Sensor

  • Smart IoT enabled gas sensor
  • Electrochemical measurement of gas concentration with up to 4 gas sensor modules
  • Pre-calibrated gas sensor modules for different gases and measuring ranges, including CO, NO, NO2, SO2
  • Installation in-situ in the tunnel’s driving area or extractive with hose adapters
  • Stainless steel housing 1.4404 (AISI 316L)
  • Sensor protected against splashing of water and powerful water jets used for tunnel washing
  • IP rating IP69K
  • Optional LCD in housing cover
  • Integrated web server for visualisation, configuration, data logging, remote maintenance
  • Connection to tunnel control system by
    • MODBUS/TCP (Ethernet)
    • MODBUS RTU (RS-485)
    • Analogue and relay outputs (optional)
    • OPC UA (Ethernet)
  • Optional smart/HUB IoT operating and control unit with touch display


Data sheet DE (PDF)
Data sheet EN (PDF)