Model H2S -Microcontroller Unit

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.

Applications

• 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

Advantages

• 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