Water quality parameters are key indicators used to assess the condition and trends of aquatic environments, and accurate monitoring of these parameters relies on high-quality water quality monitoring sensors. For drinking water, well water, and industrial wastewater treatment, professional sensor solutions are essential to ensure data accuracy. Veswe is a professional manufacturer of industrial water treatment sensors, providing reliable measurement sensors for all key water quality parameters, fully meeting the EPA's mandatory testing standards for water contaminants. The U.S. Environmental Protection Agency (EPA) has established mandatory limits for over 90 potential contaminants found in water, and Veswe’s water quality sensors are calibrated to comply with these strict standards to protect human health and prevent waterborne diseases.

 

Industrial wastewater must undergo proper treatment processes before discharge, while drinking water requires rigorous testing before it can be safely consumed. A wide range of parameters is used to evaluate water quality, generally classified into three main categories: physical, chemical, and biological. These include a variety of indicators such as color, odor, temperature, turbidity, pH, and bacterial content, and each indicator can be accurately measured by Veswe’s dedicated water treatment sensors for different application scenarios.

 

 

Physical parameters include odor, taste, color, suspended solids, temperature, turbidity, electrical conductivity, and total dissolved solids (TDS) — all core indicators for basic water quality detection, with matching high-precision measurement sensors provided by Veswe.

Chemical parameters include water pH, chlorine, chemical oxygen demand (COD), biochemical oxygen demand (BOD₅), dissolved oxygen (DO), ammonia nitrogen, and various free ions such as calcium (Ca²⁺), magnesium (Mg²⁺), ammonium (NH₄⁺), potassium (K⁺), and nitrate (NO₃⁻) — Veswe’s industrial-grade chemical parameter sensors are suitable for harsh industrial wastewater monitoring environments.

Biological parameters include bacteria, algae, and viruses — the detection of these parameters is often matched with Veswe’s physical and chemical sensors to form a complete water quality monitoring system.

 

 

 

Odor refers to the various smells emitted from water, typically caused by volatile substances dissolved in it. These odors may originate from natural sources such as algae, decaying vegetation, and organic matter in soil, or from anthropogenic pollution including industrial wastewater, pesticides, oil spills, and domestic sewage. While odor itself may not pose a direct health risk, it often serves as an early warning sign of water contamination, and abnormal odor is usually accompanied by changes in other measurable physical and chemical parameters.

 

Measurement: Generally assessed qualitatively through sensory evaluation (smelling) or quantitatively using the threshold odor number (TON) via dilution methods. Odor abnormalities can be further verified by testing other parameters with Veswe’s water quality monitoring sensors to determine the source of pollution.

 

 

Taste refers to the sensory perception experienced in the mouth when consuming water. Similar to odor, taste is primarily caused by substances dissolved in the water. Natural minerals (such as chlorides and sulfates), microbial metabolites, dissolved metal ions (like iron and manganese), as well as various organic and inorganic pollutants, can all affect the taste of water. Poor water taste is a common problem in drinking water supply, and its root cause can be found by combining TDS and ion detection sensors.

 

Measurement: Primarily assessed qualitatively through human taste perception, or quantitatively using sensory panels under controlled conditions. For industrial water treatment, taste evaluation is often combined with quantitative testing of TDS and metal ions via Veswe TDS sensors and ion detection sensors to achieve comprehensive water quality assessment.

 

 

Water is typically expected to be colorless and transparent. However, the presence of dissolved or suspended substances can impart various colors to it. Color affects the aesthetic quality of water, particularly for drinking purposes. Elevated color levels may also indicate the presence of organic contaminants or heavy metal ions, which require further quantitative detection.

 

Measurement: Determined using colorimetric methods by comparing with standard color solutions, or measured quantitatively with a spectrophotometer. Color abnormalities in industrial wastewater can be matched with Veswe turbidity sensors and heavy metal sensors for joint detection to accurately locate pollution factors.

 

 

Water temperature influences several aspects of water quality, including odor, chemical reaction rates, solubility, taste, and viscosity. Processes such as biological oxygen demand (BOD), sedimentation, and chlorination are all temperature-dependent. The ideal temperature range for drinking water is typically between 50–60°F (10–16°C), and industrial wastewater treatment processes also require strict temperature control to ensure treatment efficiency.

 

Measurement: Accurately measured using Veswe industrial water temperature sensors with high precision (±0.1℃) and IP68 waterproof rating, suitable for continuous online monitoring of drinking water pipelines, industrial wastewater tanks, and natural water bodies. Conventional thermometers are not recommended for industrial water treatment scenarios due to low accuracy and poor durability.

 

 

Turbidity is typically associated with the concentration of silt, clay, and organic matter in water. Changes in turbidity levels provide a direct visual indication of water quality. When turbidity is below 5 NTU, the water is considered clear; values above 5 NTU indicate visible turbidity, and levels exceeding 50 NTU often suggest severe pollution. Turbidity is a key indicator for wastewater treatment efficiency and drinking water safety.

 

Measurement: Accurately measured using Veswe turbidity sensors for water quality monitoring that adopt advanced light scattering technology to detect suspended particles, with a measurement range of 0-1000 NTU, fully covering the turbidity testing needs of clear drinking water (＜5 NTU) and severely polluted industrial wastewater (＞50 NTU). Veswe’s turbidity sensors support 4-20mA/RS485 output signals, easy to connect with industrial control systems.

 

 

Electrical conductivity is a common parameter in various water quality assessments. It directly reflects the concentration of dissolved ions in water—the higher the ion concentration, the greater the water’s conductivity. Drinking water and ultrapure water typically exhibit very low conductivity, while industrial wastewater has significantly higher EC values due to the presence of a large number of inorganic ions.

 

Measurement: Conductivity is measured using Veswe electrical conductivity sensors that determine the current flow between two electrodes, with measurement units usually in microsiemens per centimeter (µS/cm) or millisiemens per centimeter (mS/cm). Veswe’s EC sensors feature anti-fouling electrode design, suitable for long-term use in high-ion-concentration industrial wastewater environments.

 

 

Total dissolved solids refer to the total amount of inorganic salts and organic matter dissolved in water that can pass through a 0.45-micron filter membrane. TDS is commonly used to represent this measure and is a key indicator for evaluating drinking water quality and wastewater treatment effects. A TDS value between 50 and 300 mg/L generally indicates good drinking water quality, whereas values exceeding 1000 mg/L are typically not recommended for direct consumption.

 

Measurement: TDS values can be directly measured using Veswe TDS sensors with real-time online monitoring function, which can be seamlessly integrated with EC sensors to form a complete ion concentration detection solution. Veswe’s TDS sensors are widely used in drinking water purification plants and industrial wastewater treatment projects.

 

 

 

pH is one of the fundamental chemical parameters in water quality testing, indicating the acidity or alkalinity of water. It represents the negative logarithm of the hydrogen ion (H⁺) activity in water, typically ranging from 0 to 14. pH not only affects chemical reactions and the stability of water treatment processes but also determines the health of aquatic ecosystems. The ideal pH level for drinking water is 6.5 to 8.5. Values outside this range may cause corrosion of water supply pipelines, release of heavy metals from sediment, or biological stress to aquatic organisms.

 

Measurement: Accurately measured using Veswe pH sensors for industrial water treatment with automatic temperature compensation function, ensuring high measurement accuracy in different water temperature environments. Veswe’s pH sensors are available in online and portable models, suitable for both fixed-point monitoring of water treatment plants and on-site detection of natural water bodies.

 

 

COD is a key indicator of organic pollution in water. Higher COD values indicate higher levels of organic contaminants and greater pollution severity. Surface water generally has COD values below 20 mg/L; drinking water should be below 10 mg/L. Untreated domestic sewage and industrial wastewater can have COD levels ranging from 300 to 1000 mg/L or even higher, and reducing COD is the core goal of industrial wastewater treatment.

 

Measurement: Rapid and accurate measurement is achieved using Veswe COD sensors for organic pollution monitoring instead of the traditional potassium dichromate method with complex operation and long detection time. Veswe’s COD sensors support real-time online monitoring, which can timely reflect the changes of organic pollution in water and provide data support for wastewater treatment process adjustment.

 

 

BOD refers to the amount of dissolved oxygen consumed by microorganisms during the decomposition of organic matter in water, commonly expressed as BOD₅ (five-day biochemical oxygen demand). Higher BOD₅ values indicate more severe organic pollution and higher oxygen consumption in water, which may lead to hypoxia in water bodies and death of aquatic organisms. High-quality surface water usually has a BOD₅ below 3 mg/L; domestic sewage typically ranges from 100 to 300 mg/L, while industrial wastewater can reach several thousand mg/L.

 

Measurement: Usually determined by the dilution inoculation method, measuring dissolved oxygen consumption after 5 days of incubation in a dark, temperature-controlled environment. The dissolved oxygen required for the test can be accurately measured using Veswe dissolved oxygen sensors, which provide reliable data support for BOD₅ detection with high precision and good stability.

 

 

Dissolved oxygen is a critical parameter in water quality assessment, reflecting the concentration of oxygen dissolved in water. A DO level of ≥ 5 mg/L is generally considered good, suitable for the survival of fish and other aquatic organisms. Levels below 3 mg/L may indicate hypoxic conditions, and DO < 1 mg/L represents severe oxygen deficiency, which will cause serious damage to the aquatic ecosystem. The concentration of dissolved oxygen depends on various factors, primarily salinity, pressure, and temperature.

 

Measurement: Accurately measured using Veswe dissolved oxygen sensors for aquatic ecosystems and wastewater treatment with optical detection technology, which has the advantages of fast response, no need for frequent calibration, and anti-fouling. Veswe’s DO sensors are widely used in surface water monitoring, aquaculture, and aeration process control of wastewater treatment plants.

 

En tant que professionnel industrial water treatment sensors manufacturer, Veswe provides a complete range of high-precision sensors for all the above physical and chemical water quality parameters, with matching solutions for biological parameter detection supporting multi-sensor integration. All Veswe’s water quality monitoring sensors are CE/RoHS/FCC certified, with customizable measurement ranges, output signals (4-20mA/RS485/Modbus) and installation methods to meet the personalized needs of industrial wastewater treatment, drinking water purification, agricultural water monitoring, and aquatic ecosystem protection projects.

 

Our sensors feature rugged design for harsh water treatment environments, with long service life and low maintenance cost, which is the first choice for global water treatment enterprises, environmental monitoring institutions and industrial manufacturers. If you need to buy bulk water quality monitoring sensors or customize a complete water quality detection sensor solution for your project, please contact Veswe directly for a free quote and sample testing. You can also download our detailed water treatment sensor datasheet through our official website to view product specifications, application cases and technical parameters.