Digital Transmitter and Sensors Series
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CS6710D Digital Fluoride ion Sensor
Digital Fluoride Ion Sensor is an online analytical device designed for the continuous measurement of fluoride ion (F⁻) concentration in water. It operates on the ion‑selective electrode (ISE) principle using a solid‑state lanthanum fluoride (LaF₃) crystal membrane, which ensures excellent selectivity and stability in routine and industrial applications. The sensor includes an integrated reference electrode and automatic temperature compensation (ATC) to deliver accurate, drift‑free readings across a typical range of 0.01–2000 mg/L. It directly outputs measurement data via RS‑485 (Modbus RTU), allowing plug‑and‑play integration into SCADA or IoT monitoring platforms. The sensor features a durable, waterproof (IP68) body, long‑term stability without reagent consumption, and low maintenance, making it suitable for drinking water fluoridation control, wastewater treatment, and environmental monitoring. By providing real‑time, reliable fluoride data, the digital sensor helps optimize chemical dosing, ensure compliance with health and safety standards, and protect public health. -
CS6711D Digital Chloride ion Sensor
Digital Chloride Ion Sensor is an online analytical device designed for continuous, real-time measurement of chloride ion (Cl⁻) concentration in water and industrial solutions. It operates on the ion-selective electrode (ISE) principle, utilizing a solid-state or PVC membrane that responds selectively to chloride ions. The sensor features automatic temperature compensation (ATC) and a built-in reference electrode for drift-free, accurate readings. It directly outputs measurement data via RS-485 (Modbus RTU), enabling seamless integration into SCADA, IoT, or remote monitoring systems. Constructed with durable materials, it offers IP68 protection and low maintenance requirements. The sensor covers a typical measurement range of 0–50000 ppm (0–5%) and responds quickly. Its digital design eliminates signal interference, ensures plug-and-play connectivity, and supports remote calibration. Widely used applications include concrete corrosion monitoring, drinking water safety, industrial wastewater control, food processing, and road runoff testing. By providing continuous, reliable chloride data, it helps protect infrastructure, ensure public health, and reduce chemical dosing and operational risks in water treatment processes.
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CS6714D Digital Ammonium Nitrogen Ion Sensor
The Digital Ammonium Nitrogen Ion Sensor is an advanced online analytical device for continuous monitoring of ammonium (NH₄⁺-N) concentration in water and wastewater. It operates on the principle of ion-selective electrode (ISE) technology, combined with a reference electrode and automatic temperature compensation (ATC) for accurate, drift-free readings. The sensor directly outputs digital data via RS-485 (Modbus RTU), enabling easy integration into SCADA or IoT systems. It features a robust IP68 housing, minimal maintenance (no reagents required), and a built‑in cleaning mechanism to prevent biofouling. The sensor is widely used in municipal wastewater treatment, aquaculture, drinking water source monitoring, and environmental protection. It measures ammonium nitrogen typically in the range of 0–1000 mg/L with fast response and high stability. Compared to traditional colorimetric analyzers, this sensor offers lower operating costs and real-time data, making it an essential tool for efficient process control and regulatory compliance. -
CS4773D Digital Dissolved Oxygen Sensor
Dissolved oxygen sensor is a new generation of intelligent water quality detection digital sensor independently developed by twinno. Data viewing, debugging and maintenance can be carried out through mobile APP or computer. Dissolved oxygen on-line detector has the advantages of simple maintenance, high stability, superior repeatability and multi-function. It can accurately measure DO value and temperature value in solution. Dissolved oxygen sensor is widely used in wastewater treatment, purified water, circulating water, boiler water and other systems, as well as electronics, aquaculture, food, printing and dyeing, electroplating, pharmaceutical, fermentation, chemical aquaculture and tap water and other solutions of the continuous monitoring of dissolved oxygen value. -
CS4760D Digital Dissolved Oxygen Sensor
Digital Dissolved Oxygen Sensor based on the fluorescence method is a modern, high-performance sensor for continuous DO measurement in water and wastewater. Unlike traditional polarographic or galvanic sensors, it uses an optical principle: a luminescent material is excited by blue light, and the decay time or intensity of the emitted red light is directly related to the oxygen concentration. This method requires no electrolyte, no membrane replacement, and has no oxygen consumption, significantly reducing maintenance and calibration frequency. The sensor features a built-in digital output (RS-485, Modbus RTU), automatic temperature and pressure compensation, and anti-interference design for stable readings even in low-flow or low-oxygen environments. It is widely used in aquaculture, municipal wastewater treatment, surface water monitoring, and industrial process control. With its durable construction, fast response, and long-term stability, the fluorescence DO sensor ensures accurate and reliable online monitoring for critical water quality management. -
CS3742D Conductivity Sensor
digital conductivity sensor is an advanced instrument for measuring the electrical conductivity of liquids, indicating total ionic concentration. It directly outputs calibrated readings in μS/cm or mS/cm via RS‑485 (Modbus RTU), eliminating signal conversion errors common in analog sensors. The sensor features two or four graphite or platinum electrodes with automatic temperature compensation (ATC) and a wide measurement range (e.g., 0‑2000 μS/cm to 0‑2000 mS/cm). Its smart design enables plug‑and‑play connection, remote calibration, and self‑diagnostics. Widely used in water treatment, reverse osmosis, chemical process, and aquaculture, the digital conductivity sensor provides reliable, real‑time data for industrial control and environmental monitoring.
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CS3701D Digital Conductivity Sensor
digital conductivity sensor is an advanced instrument for measuring the electrical conductivity of liquids, indicating total ionic concentration. It directly outputs calibrated readings in μS/cm or mS/cm via RS‑485 (Modbus RTU), eliminating signal conversion errors common in analog sensors. The sensor features two or four graphite or platinum electrodes with automatic temperature compensation (ATC) and a wide measurement range (e.g., 0‑2000 μS/cm to 0‑2000 mS/cm). Its smart design enables plug‑and‑play connection, remote calibration, and self‑diagnostics. Widely used in water treatment, reverse osmosis, chemical process, and aquaculture, the digital conductivity sensor provides reliable, real‑time data for industrial control and environmental monitoring. -
CS3501D Digital Conductivity Sensor
Measuring specific conductivity of aqueous solutions is becoming increasingly important for determining impurities in water. The measurement accuracy is greatly affected by temperature variation, polarization of the contact electrode surface, cable capacitance, etc.Twinno has designed a variety of sophisticated sensors and meters that can handle these measurements even in extreme conditions.
Suitable for low conductivity applications in the semiconductor, power, water and pharmaceutical industries, these sensors are compact and easy to use.The meter can be installed in several ways, one of which is through the compression gland, which is a simple and effective method of direct insertion into the process pipeline.
The sensor is made from a combination of FDA-approved fluid receiving materials. This makes them ideal for monitoring pure water systems for the preparation of injectable solutions and similar applications.In this application, the sanitary crimping method is used for installation. -
CS7920D Online Flow-through Turbidity Sensor
The principle of the turbidity sensor is based on the combined infrared absorption and scattered light method. The ISO7027 method can be used to continuously and accurately determine the turbidity value. According to ISO7027 infrared double-scattering light technology is not affected by chromaticity to determine the sludge concentration value. The self-cleaning function can be selected according to the use environment. Stable data, reliable performance; built-in self-diagnosis function to ensure accurate data; simple installation and calibration. -
T4070&CS7800D Turbidity Online Analyzer(Flow-through)
Turbidity Online Analyzer (Flow-through) is an advanced instrument designed for the continuous, real-time measurement of turbidity in liquid streams. It is widely applied in drinking water treatment, wastewater monitoring, industrial process control, and environmental protection.
Unlike traditional benchtop turbidimeters, this flow-through analyzer integrates a special flow cell that directs a sample stream directly through the optical measurement zone. Operating on the nephelometric principle (typically ISO 7027 or EPA 180.1), it uses an infrared or white light source to measure light scattered by suspended particles at a 90° angle. This design minimizes external light interference, ensures consistent sample presentation, and prevents bubble accumulation, all of which improve measurement accuracy and repeatability. -
CS7800D Online Turbidity Sensor
The electrode body is made of POM, which is corrosion-resistant and more durable. The seawater version can be plated with titanium, which also performs well under strong corrosion.IP68 waterproof design, can be used for input measurement. Real-time online recording of Turbidity/MLSS/SS, temperature data and curves, compatible with all water quality meters of our company.0.001-20.00NTU-200.00NTU-400NTU, a variety of measuring ranges are available, suitable for different working conditions, the measurement accuracy is less than ±5% of the measured value. -
Online Oil-in-water Analyzer SC4000OIL
Industrial online oil-in-watermonitor is an online water quality monitor and control instrument with microprocessor. The instrument is equipped with UV oil-in-water sensors. The online oil-in-water monitor is a highly intelligent online continuous monitor. It can be equipped with UVsensor to automatically achieve a wide range of ppm or mg/L measurement. It is a special instrument for detecting oil-in-water content in liquids in
environmental protection sewage related industries. The on-line oil in water analyzer consists of an immersion sensor and a multi-function display. High precision immersion probe was used to measure oil substances in water, and uv fluorescence technology was used. It is suitable for surface water oil pollution monitoring, industrial process control, oil leak detection and other online water quality monitoring and so on. -
SC6500OIL Online Oil-in-water Analyzer
Online Oil-in-Water Analyzer is a specialized instrument designed for the continuous, real-time monitoring of oil and hydrocarbon concentrations in water. It plays a critical role in environmental protection, industrial wastewater treatment, produced water monitoring in oil and gas operations, marine vessel ballast water management, and cooling water systems in power plants and refineries. By providing immediate detection of oil contamination, it enables rapid response to prevent environmental violations, protect aquatic ecosystems, and ensure regulatory compliance with stringent discharge limits (such as the 15 ppm standard for produced water).
The analyzer employs advanced optical detection technologies, most commonly ultraviolet fluorescence (UVF) or infrared absorption (IR) methods. UVF technology is particularly effective as it excites oil molecules with specific wavelengths of light, causing them to emit fluorescence proportional to the oil concentration. This method offers high sensitivity, fast response, and minimal interference from water itself. Some systems utilize laser-induced fluorescence or scattered light measurements for enhanced accuracy in challenging matrices like high turbidity or varying oil types.
Fully automated, the instrument integrates sampling, sample conditioning (including homogenization and degassing), measurement, and cleaning cycles. It features automatic calibration, self-diagnostic functions, and robust sensor designs with anti-fouling mechanisms like wipers or air blasts to maintain reliability in harsh environments. Data is transmitted via standard protocols (4-20mA, Modbus, Ethernet) for integration with plant control systems, enabling real-time alarms and automated process adjustments.
By delivering accurate, continuous oil-in-water measurements, this analyzer serves as an indispensable tool for preventing costly shutdowns, avoiding environmental fines, and safeguarding water resources in industries where oil contamination is a critical concern. -
SC7000OIL Online Oil-in-water Analyzer
Online Oil-in-Water Analyzer is a specialized instrument designed for the continuous, real-time monitoring of oil and hydrocarbon concentrations in water. It plays a critical role in environmental protection, industrial wastewater treatment, produced water monitoring in oil and gas operations, marine vessel ballast water management, and cooling water systems in power plants and refineries. By providing immediate detection of oil contamination, it enables rapid response to prevent environmental violations, protect aquatic ecosystems, and ensure regulatory compliance with stringent discharge limits (such as the 15 ppm standard for produced water).
The analyzer employs advanced optical detection technologies, most commonly ultraviolet fluorescence (UVF) or infrared absorption (IR) methods. UVF technology is particularly effective as it excites oil molecules with specific wavelengths of light, causing them to emit fluorescence proportional to the oil concentration. This method offers high sensitivity, fast response, and minimal interference from water itself. Some systems utilize laser-induced fluorescence or scattered light measurements for enhanced accuracy in challenging matrices like high turbidity or varying oil types.
Fully automated, the instrument integrates sampling, sample conditioning (including homogenization and degassing), measurement, and cleaning cycles. It features automatic calibration, self-diagnostic functions, and robust sensor designs with anti-fouling mechanisms like wipers or air blasts to maintain reliability in harsh environments. Data is transmitted via standard protocols (4-20mA, Modbus, Ethernet) for integration with plant control systems, enabling real-time alarms and automated process adjustments. -
SC8500OIL Online Oil-in-water Analyzer
Online Oil-in-Water Analyzer is a specialized instrument designed for the continuous, real-time monitoring of oil and hydrocarbon concentrations in water. It plays a critical role in environmental protection, industrial wastewater treatment, produced water monitoring in oil and gas operations, marine vessel ballast water management, and cooling water systems in power plants and refineries. By providing immediate detection of oil contamination, it enables rapid response to prevent environmental violations, protect aquatic ecosystems, and ensure regulatory compliance with stringent discharge limits (such as the 15 ppm standard for produced water).
The analyzer employs advanced optical detection technologies, most commonly ultraviolet fluorescence (UVF) or infrared absorption (IR) methods. UVF technology is particularly effective as it excites oil molecules with specific wavelengths of light, causing them to emit fluorescence proportional to the oil concentration. This method offers high sensitivity, fast response, and minimal interference from water itself. Some systems utilize laser-induced fluorescence or scattered light measurements for enhanced accuracy in challenging matrices like high turbidity or varying oil types.