ECH Elektrochemie Halle GmbH

ECH Elektrochemie Halle GmbH

Model H2S - Microcontroller Unit



OnlineH2S includes a microcontroller-unit for a quantitative determination of the released H2S from the sewer with sensor technology at two or more selected measurement points. It serves as the basis for H2S-adapted regulation of chemicals for water treatment in sewage systems.

The H2S-measurement works with selective electrochemical sensors. The mobile microcontroller includes a data acquisition and data transmission tool, digital and analogue input connections for various easurands as well as digital and analogue alarm output connections (4 – 20 mA) for controlling of dosing pumps for treatment-chemicals, valves etc.

Data can be downloaded by a secured internet transfer line at any time. The control-algorithm includes an intelligent self-learning system of settings, which reacts immediately to local circumstances of the sewage-volume and H2S-carriage.

By evaluating those information, an optimal dosing-value will be determined automatically that will be used for the water treatment with chemicals in the sewage system.


  • Elimination scent annoyance from communal and industrial sewage (pressure pipes, sewer tunnels, grease separator, reduction of tension shafts, pump sumps, public streets and places)
  • Prevention of the bio-corrosion at wastewater-leading buildings
  • Used for communal waste-water-communities, sewage plants, waste water treatment and purification plants


  • Complete measurement system with data acquisition at two or more measurement-points by H2S-monitoring
  • Calibration related to the concentration of sulphide in waste water
  • High sensitivity (below 0.01 ppm)
  • Suck of the gas sample by a transfer line (up to 50 m length and 10 m depth)
  • Selective electrochemical sensors
  • Low maintenance effort by automatic zero-point-compensation
  • Long life-time of the sensor due to an intermittent gas path control
  • Integrated rinsing steps in order to guarantee current samples for analysis
  • Analogue input connections for various pumps and signals
  • Potential free switching outputs (e. g. sewage pumps)
  • Output signal (4-20 mA) to control dosing pumps for water-treatment-chemicals in order to send the signals to a customers’ process control system
  • Direct data acquisition in the device for several months
  • Data transmission via GPRS

  • Online-measurement of actual H2S-concentration in waste water supply (e .g. pump sump) and waste water drainage (sewer tunnel or pressure pipes)
  • Very high sensitivity (below 0.01 ppm) with the most precision
  • Selective electrochemical sensors
  • Integrated rinsing steps for the certainty of a steady current sample for analysis
  • Direct calibration of actual sulfide-concentration in waste water
  • Automatic zero-point-compensation
  • Determination of a optimal control-algorithm for dosing chemicals of the waste water (4 – 20 mA signal) through adaptation at the current H2S-carriage and water volume (4 – 20 mA signal)
  • Threshold selectivity by an authorized person

  • Power supply:mains or battery operated
  • 115 – 230 V, 50 – 60 Hz, 12 VDC (internal battery)
  • Power input:40 W maximum, 5 W standby-mode
  • Measuring range:0.01…2000 ppm
  • Typical duration:24 hour online measurement
  • Input signal:4…20 mA analogue (isolation amplifiers) or digital
  • Output signal:4…20 mA analogue (isolation amplifiers) or digital
  • to control the dosing pumps
  • Protection type:IP65
  • Dimensions & weight:H2S-Sensor: 200 x 250 x 122 mm, 2 kg
  • H2S-Controller: 380 x 210 x 600 mm, 10 kg

Customer reviews

No reviews were found for Model H2S - Microcontroller Unit. Be the first to review!