Water Quality

Water quality testing of public facilities

As we all know, there are a lot of pollutants in swimming pool water, and the polluted water can easily become a source of transmission of some diseases, causing various discomforts to swimmers. Therefore, the use of online water quality monitoring equipment for real-time monitoring and strict filtration and disinfection of pool water is an important link to prevent the spread of various diseases, protect swimmers and improve the quality of pool water.

sensors for water quality

The swimming pool water quality online monitoring system is a data information network that integrates water quality and hygiene monitoring sensors, wireless data transmission equipment and remote monitoring platforms. The online monitoring system monitors the turbidity, residual chlorine, pH value, ORP and other data in the swimming pool through various sensors. The data of online monitoring can be displayed on the display device in the swimming pool, and the water quality of the swimming pool can be seen at a glance. For merchants, it not only reduces operating costs, but also ensures that health supervisors can maintain the water quality of swimming pools in a timely and effective manner; for consumers, it ensures their own health rights; moreover, regulatory authorities can also view data in real time through the monitoring platform. , improve the efficiency of health law enforcement.

Designed for the stringent clean working requirements of the swimming pool: Winsen places particular emphasis on safety

  • The water turbidity affects the visual effect of the swimming pool and the visibility in the pool;
  • The residual chlorine value reflects the sanitation and disinfection of the water body;
  • The pH value can ensure the comfort of swimming.

Winsen provides OPR sensors, residual chlorine sensors, pH sensors, and dissolved oxygen sensors for the needs of various sensors for water quality testing in public facilities.

City water

When using ozone to sterilize tap water, an ozone sensor is required to detect the sterilized exhaust gas, so as to prevent the exhaust gas with excessive ozone concentration from endangering the air environment and personnel health.

sensors for water quality

In the process of using ozone to sterilize tap water, the Winsen ozone sensor module ZE03-O3 can monitor whether ozone leaks and the residual ozone concentration after disinfection, preventing ozone leakage from harming the human body, and also helping to treat the disinfection exhaust and reduce air pollution .

ZE03-O3 ozone sensor

ZE03-O3 ozone sensor

ZE03-O3 adapts a three-electrode electrochemical gas sensor and a high-performance microprocessor, and can be measured with an ozone sensor. The built-in temperature sensor performs temperature compensation, which can accurately measure the gas concentration in the environment. At the same time, it has digital output and analog voltage output, which is convenient for users to use and debug, and greatly shortens the user's design and development cycle. The ozone sensor can be set according to the actual situation. different restrictions.

Water Quality

Water quality testing of sewage treatment

sensors for water quality

In the process of sewage biological treatment, there are certain requirements for sewage quality, water temperature, dissolved oxygen in water, pH value etc. As an important device for measuring water body data, various water quality sensors provide technical support for water pollution control and water safety in the process of sewage treatment.

Dissolved oxygen

  • Too high dissolved oxygen (greater than 4mg/L) will accelerate the consumption of organic substances in sewage, and cause the aging of activated sludge and the proliferation of filamentous bacteria due to lack of nutrients in microorganisms. Long-term high dissolved oxygen will reduce the flocculation performance and adsorption capacity of activated sludge.
  • If the dissolved oxygen is too low (less than 1.5mg/L), the life activities of microorganisms will be inhibited, resulting in the decay, disintegration and deterioration of microorganisms; it will affect the respiration of microorganisms and the purification ability of activated sludge, and the sludge will float and decay until swell.

pH value

The pH value will affect the charge of the microbial cell membrane in the activated sludge of sewage treatment, thereby affecting the activity of enzymes in the process of nutrient absorption and metabolism by microorganisms; changing the availability of nutrients in the growth environment and the toxicity of harmful substances.


ORP is an important direction for the development of automatic control technology and anaerobic precise control in sewage treatment plants, which is of great significance for saving energy, controlling the metabolic pathways of anaerobic microorganisms and improving the treatment effect.

  • If the ORP value is low, it indicates that the content of reducing substances or organic pollutants in the wastewater treatment system is high, the concentration of dissolved oxygen is low, and the reducing environment is dominant.
  • If the ORP value is high, it indicates that the concentration of organic pollutants in the wastewater is low, the concentration of dissolved oxygen or oxidizing substances is high, and the oxidizing environment is dominant.

Ammonia nitrogen

Ammonia nitrogen in wastewater refers to nitrogen in the form of free ammonia and ionized ammonium, mainly from the decomposition of nitrogen-containing organic matter in domestic sewage, industrial wastewater such as coking and synthetic ammonia, and farmland drainage. Due to the oxidation of NH4+-N, the concentration of dissolved oxygen in the water body will decrease, resulting in the water body turning black and smelly, and the water quality declining, which will affect the survival of aquatic animals and plants.

Residual chlorine

Residual chlorine means that after chlorine is put into water, in addition to consuming a part of the chlorine amount by interacting with bacteria, microorganisms, organic matter, inorganic matter, etc. in the water, there is still a part of the chlorine amount left, which is called residual chlorine. Chlorine-containing disinfectants generally refer to disinfectants that dissolve in water to produce hypochlorous acid with microbicidal activity. The high residual chlorine content is easy to kill biological activity, affecting the normal operation of the sewage biochemical treatment unit, and the poor sewage treatment effect will lead to the risk of exceeding the standard of effluent quality.

Winsen provides high-quality dissolved oxygen sensors, pH sensors, OPR sensors, ammonia nitrogen sensors, and residual chlorine sensors for water quality testing of sewage treatment species.

Municipal administration


Dissolved Oxygen Sensor MW-O101

It is widely used in ORP value detection in the fields of laboratory scientific research, water supply, wastewater treatment, aquaculture, farmland irrigation, etc. The MW-O101 sensor is a polarographic dissolved oxygen sensor. Under a certain polarization potential of the sensor, the oxygen dissolved in the water body will pass through the oxygen permeable membrane, and a redox reaction will occur on the surface of the working electrode, and the resulting current is proportional to the concentration of dissolved oxygen in the water body. The concentration of dissolved oxygen in water is estimated by measuring the magnitude of the current.

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Electrochemical pH Sensor MW-pH101

The MW-pH101 sensor is an electrochemical pH water quality detection sensor. The H+ in the solution to be tested interacts with the electrode of the sensor to generate a voltage signal, and the magnitude of the voltage is proportional to the concentration of H+. By measuring the voltage signal size can be dissolvedthe corresponding pH value of the liquid.

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Electrochemical Ammonia Nitrogen Sensor MW-NH101

MW-NH101 sensor is an electrochemical ammonia nitrogen water quality detection sensor. Ammonium ions in the solution to be tested permeate through the sensor selective membrane, causing changes in membrane potential, and the change in membrane potential is proportional to the concentration of ammonium ions in the solution. Ammonium ion concentration.

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Residual Chlorine Sensor MW-RCl101

MW-RCl101 sensor is a polarographic residual chlorine water quality detection sensor The residual chlorine molecules in the measured solution pass through the selective membrane of the sensor and reach the cathode surface of the electrode. Under the polarization of the polarization potential, the residual chlorine molecules get electrons and are reduced, and the anode loses electrons and is oxidized. At the same time, a current signal is generated, and the magnitude of the signal is proportional to the residual chlorine concentration. The residual chlorine concentration is judged by detecting the magnitude of the current signal during the electrode reaction process.

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TDS Sensor MW-TDS101

MW-TDS101 sensor is an on-line water quality detection sensor, which can be used to detect the content of total dissolved solids (TDS) in water to judge the cleanliness or pollution of water. The unit of measurement for TDS is mg/L, which indicates how many mg of dissolved solids is dissolved in 1L of water. The higher TDS value, the more dissolved solids the water contains.

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Dissolved Oxygen Monitoring Module ZW01

ZW01 Dissolved Oxygen Detection Module is a general-purpose module that uses electrochemical principle to detect oxygen content in water, with good selectivity and stability. Using digital signal output, easy to use. ZW01 is a universal gas module designed and manufactured with mature electrochemical detection technology and sophisticated circuit design.

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How to choose the right sensor for your project?

We have 17 sensor series, 200+ categories, and 300+ detection objects for gas detection. Such as CO, CO2, VOC, PM2.5, CH4, LPG and so on. In particular, we also have MEMS sensors. According to your industry application, gas principle, power consumption, accuracy, and range requirements, and we can select a specific model for you. You can also use the product filter below to choose a suitable product, or choose online serivce.

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The first six FAQs. Use the search bar above to reveal more!

How to Install and Place the Infrared Dust Sensor?

It must be installed vertically. Keep away from artificial air flow such as fans. When used in air purifiers, the front and rear of the fan cannot be installed. Optionally install it on one side of the shell, but keep vents on the shell to ensure that the external air can diffuse in.

Can the Two Voltages of Mq-7 Exist All the Time, or Do They Need to Be Powered Alternately? if It is an Alternate Power Supply, What is the Appropriate Power Supply Time?

It requires alternate power supply. Please check the information on the product manual. This sensor is powered by 1.5V and 5V alternately. The low temperature and low voltage (1.5V) state can detect CO, and the high voltage (5V) is the desorption process. The recommended 5V voltage duration is 60s, 1.5V voltage duration is 90s to alternately supply power. Since it is a desorption process at 5V, it is normal for the voltage to drop when CO is 150ppm.

What is the Difference Between Semiconductor Sensors and Electrochemical Sensors?

There is no good linear correspondence between the gas concentration and voltage of the semiconductor sensor, and it is generally only used for fixed-point calibration products; there is a good linear correspondence between the gas concentration and the output current of the electrochemical sensor, and can be made into quantitative detection products.
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