Hydrogen Sulfide Detector-Transmitter E2638-H2S

Evikon MCI
  • Stable long-life electrochemical cell
  • Ranges 0...100 ppm, 0...2000 ppm H2S
  • Two analog outputs 4-20 mA / 0-10 V
  • Digital interface RS485 Modbus RTU
  • Two SPST relays option
  • Attached or remote sensor options


Hydrogen Sulfide transmitter E2638-H2S is a member of new PluraSens® family of multifunctional measurement instruments.

Applications include sewerage systems, labs, industrial premises and other areas, where potentially toxic concentration of hydrogen sulfide can accumulate.

The instrument utilises novel fully calibrated and temperature compensated gas sensor with excellent repeatability, stability and long lifetime.

To connect the detector to safety or building automation systems use two analog outputs and RS485 digital interface with industry standard Modbus RTU protocol. We recommend to set the output scale within 20-100% of the detection range.

Two relays with closing contact (option) may be used for remote signalling or ventilation control. For 0...100 ppm range alarm set-points are 10 and 20 ppm. For 0...2000 ppm range alarm set-points are user settable within 5-95% of the detection range.

The device is available with either attached or remote sensor probe (default cable length is 3 m).

A version with an LCD indicator is available. 


Calibration Hydrogen sulfide H2S
Sensing method Long-life electrochemical cell
Sampling method Diffusion
Detection range Standard 0...100 ppm (500 ppm peak) H2S
High 0...2000 ppm
other ranges on request
Resolution 0,1 / 2 ppm H2S
Sensor lifetime > 2 years
Power supply 11...30 VDC
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 Light grey ABS plastic, wall mount, IP65
Dimensions H90 × W145 × D55 mm
Operating conditions -30...+50 °C, 15...90% RH