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MS08 H₂S

Measurement of dissolved sulphides and H₂S

The determination of dissolved hydrogen sulphide and total dissolved sulphide concentrations is necessary for the control of injection of H2S reagents into sewerage networks, industrial process control, moni- toring of aquaculture ponds and processes. of vinification. Due to its high chemical reactivity and rapid transfer of concentrations between liquid samples and the gas phase, the measurement of dissolved H2S is difficult despite careful sampling.

Accurate and reliable in-situ determination of concentrations is now possible with the MS08-H2S for online or portable measurements. The integrated H2S micro sensor is the biggest innovation of this system, it allows a fast measurement with a very high local resolution. The multi-parameter MS08 system collects raw H2S data and temperature information to perform compensation calculations and display dissol- ved H2S concentration in mg/l.

Thanks to the parallel measurement of the pH, the system is able to calculate the total dissolved sulphide concentrations in mg/l.

Dissolved H₂S and TDSA measurement can be done with two probes type:

The MS08 device, for portable or laboratory measurement: this kit contains a reading data box and two probes are linked to it. The titanium probe contains the H₂S amperometric micro-sensor and the other probe combine a pH sensor and a temperature measurement, necessary for the concentration determination. The MS08-H2S is designed for portable measurements (about 12 hours of battery life) and can also be connected to a 220 VAC power supply for continuous measurements.
The CTD48 system, stronger, for a continuous use in water: the probe contains in the head several sensors that allow concentration calculation. The titanium protection cage includes then a H₂S amperometric micro-sensor, a pH sensor, a temperature sensor and can also hold a pressure sensor. Measurement data are operated through electronic embedded in the probe’s body. A CTD48M version that records data is also available.

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Measurement principle

The dissolved H2S passes through the gas permeable membrane. It diffuses to the working electrode where an electrochemical oxidation reaction takes place. The generated current, proportional to the hydrogen sulphide concentration, is measured by the probe.
This current, 0 to 400 picoamperes, is converted and operated by the MS08, the measurement data are compensated with temperature measurement and pH.

Applications

Monitoring and protection of wastewater networks
Control of H2S reagent injections
industrial process control
Aquaculture tanks monitoring
Controle of winemaking processes

Advantages

Immersed measurement without sampling
No interference with thurbidity
Automatic temperature and pH compensation
Portable / laboratory and continuous measurements
Data display, H2S, total sulphide, T° and pH
Extracting data to computier via USB

Measurement principle	Amperometric measurement with T° and pH compensation
Measurement ranges	- type I 0,05 … 10 mg/l H₂S - type II 0,5 … 50 mg/l H₂S - type III 0,01 … 3 mg/l H₂S - type SL 0,003 ... 1,5 mg/l H₂S - type L 0 ... 150 mg/l H₂S
Response time	T 90% 2 seconds
Accuracy	2% of the measured value
H2S consumption	Negligible
Additionnal sensors	temperature and pH, combined
Interferences on measurement	no interference in salt water up to 40 g/l of salt no interference in presence of: carbon dioxide (up to 25.38 vol.%), Methane (up to 5.78 vol.%), Hydrogen (up to 0.544 vol.%), Ammonia (up to at 1000 ppm (v)), carbon monoxide (up to 92 ppm (v)), CS2 (up to 5 vol%), organic solvents (up to 20% vol.), acetic acid (up to at 1 mol / l), dimethyl sulfide
Micro-sensor H2S lifetime	6 months in portable use, 10 in continuous (depends on stress by pH variations)
Power supply	6 batteries Mignon / 220 VAC, charger supplied
Housing material	H2S probe - titanium / temperature-pH sensor - plastic
Dimensions (d x L)	H2S probe - 17 mm x 205 mm / temperature-pH - 12 mm x 120 mm
Interface	data display on integrated screen - H2S / T° / residual current / pH / Total dissolved sulphide RS-232 / USB (option) to a computer, software not provided, free download type «HYPERTERMINAL» String ASCII / 2 seconds Conversion by the software for access to Lotus 1-2-3 or Excel calculation software
Maintenance	Distilled water cleaning of the measuring diaphragm after every use
Medium / sample temperature	0 ... + 30 ° C (40 ° C possible with a specific calibration on request)