Flameproof Ammonia Detector-Transmitter E2658-NH3-S

Evikon MCI
  • Suitable for ATEX Zones 2 and 22
  • Stable long-life metal-oxide gas sensor
  • Typical range 0...1000 ppm NH3
  • 2 × 4-20 mA / 0-10 V, RS485
  • Two SPST relays (option)


E2658 series is a new line of flameproof detectors and transmitters intended for use in ATEX Zones 2 and 22. 

E2658 series devices are based on PluraSens® multifunctional platform.

Ammonia detector-transmitter E2658-NH3-S utilises novel fully calibrated and temperature compensated metal-oxide gas sensor with excellent repeatability, stability and long lifetime. 

To connect the device to safety or building automation systems use two analog outputs and RS485 digital interface with industry standard Modbus RTU protocol.

Two relays with closing contact (option) may be used for remote signalling or ventilation control. Default alarm set-points are typically at 20% LEL and at 50% LEL.


Calibration Ammonia NH3
Sensor type metal-oxide semiconductor
Sampling method Diffusion
Detection ranges 0...1000 ppm NH3
Resolution 1 ppm NH3
Accuracy ± 5 ppm NH3
Sensor lifetime > 5 years
Power supply 11...30 VDC, 24 VAС, or 230 VAC
Digital interface RS485, Modbus RTU protocol
Analog outputs 2 × 4-20 mA / 0-10 V, user settable
Output relays (option) 2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Enclosure Grey die-cast aluminium, wall mount
Protection class IP66
Dimensions H120 × W125 × D57 mm
Operating conditions -30...+70 °C, 15...95 %RH
normal ambient oxygen level
Safe areas and ATEX Zones 2 and 22