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

The E2638-NH3-E ammonics sensor is used for precise and long-lasting measurement of the NH3 content of the air.


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The device is designed for leakage detection in cold stores, warehouses, etc. It is not recommended to use the detector in rooms with constantly high ammonia concentration, such as cattle, pig and poultry houses, as this will shorten the life of the sensor.

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

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 NH3: 0 - 1000 ppm / 0 - 300 ppm / 0 - 100 ppm
  • Resolution: 1 ppm
  • Sensor lifetime: > 2 years
  • Maintenance interval: 6 months
  • 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...+50°C (15-90% RH non-condensing / 0.9-1.1 atm)