Carbon dioxide sensor with RS-485/Modbus and 4-20 mA / 0-10V interfaces.

The E2638-CO2 carbon dioxide sensor is used for precise and long-lasting measurement of the CO2 content of the air.


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Applications for the E2638-CO2 include office and industrial buildings, greenhouses, underground garages, heating systems or other enclosed spaces where toxic carbon dioxide concentrations may accumulate.

The instrument uses a fully calibrated and temperature compensated photoacoustic gas sensor with excellent repeatability, stability and long lifetime.

The sensor can be used universally via two analog outputs and a digital RS485 interface with the industry standard Modbus RTU protocol.

Technical Data

  • Measuring range CO2: 0 - 10,000 ppm
  • Resolution: 1 ppm
  • Sensor lifetime: approx. 10 years
  • Maintenance interval: No recalibration in the field if the ABC algorithm is activated
  • Interface: RS-485 / Modbus
  • Interface: 2x 4-20 mA or 0-10 V
  • Power supply: 12-36 V DC

Mechanical data

  • Housing: ABS for wall mounting
  • Dimensions: 90*145*55 mm (H x W x D; without connectors)
  • Protection class: IP65
  • Operating conditions: -40°C...+60°C (0-100% RH / 0.9-1.1 atm)