What are the maintenance points for digital pH sensors

2025-08-06

1. Regular cleaning Method: Dip a soft cloth or cotton swab in water or specialized cleaning agent, gently wipe the electrode part, and avoid scratching the electrode with hard objects. Attention: Clean the electrodes promptly after measurement to prevent measurement errors caused by the attachment of pollutants (such as algae and oil stains); After cleaning, dry it with filter paper to avoid cross contamination. 2. Calibration management Frequency: Based on the usage scenario, it is recommended to calibrate once a week to once a month; High precision demand scenarios (such as laboratories) require a shorter calibration cycle. Method: Use standard buffer solutions (such as pH 4.01, pH 7.00, pH 10.01) for two-point calibration to ensure sensor response speed and stability. Temperature compensation: before calibration, adjust the temperature compensation setting of the sensor to make it consistent with the temperature of the solution to be measured (the pH value of the standard buffer solution is different at different temperatures). 3. Storage and usage environment Storage: When not in use for a long time, soak the electrode in a 3mol/L KCl solution to avoid drying and electrode aging; The storage environment should be dry, ventilated, and kept away from high temperatures, high humidity, and ...

Digital dissolved oxygen sensor application scenarios

2025-08-06

The digital dissolved oxygen sensor is widely used in scenarios that require real-time monitoring of dissolved oxygen concentration in water due to its high precision, fast response, strong anti-interference ability, and digital integration advantages. The following are typical application scenarios and specific case analysis: 1、 Aquaculture Core requirements Dissolved oxygen is a key parameter for respiration in aquatic organisms such as fish, shrimp, and crabs. Hypoxia can lead to suffocation, death, or growth retardation. Real time monitoring of dissolved oxygen in different water layers (such as pond bottoms and net cages) is required to avoid local hypoxia. Application Cases Factory based circular aquaculture: Multiple sensors are deployed in the aquaculture pool, combined with a PLC control system to automatically adjust the aerator and water flow rate, maintaining dissolved oxygen at 5-8mg/L (suitable range for fish). Pond aquaculture: Real time data is uploaded to a mobile app through buoy sensors, allowing farmers to remotely monitor changes in dissolved oxygen levels and activate oxygenation equipment in a timely manner during nighttime or rainy days. High density aquaculture: For example, in shrimp farming, dissolved oxygen levels below 3mg/L can trigger stress reactions, sensors ...

The core function of the Online Monitoring Instrument for Oil Fume Concentration

2025-08-06

1、 Core monitoring function Multi parameter real-time monitoring Oil fume concentration: Using the principle of laser scattering (such as particle aggregation light scattering method), the oil fume particles are irradiated with laser and the scattered light intensity is measured to establish a linear relationship between concentration and light intensity, achieving high-precision measurement (usually with an error of ≤± 10%). Particle concentration: Simultaneously monitor fine particulate matter such as PM2.5 and PM10 to assess the impact of air quality on health. Non methane total hydrocarbons (NMHC): Monitor volatile organic compounds (VOCs) emissions for scenarios such as grilling and frying to prevent photochemical smog pollution. Auxiliary parameters: Integrated sensors for temperature, humidity, flue gas pressure, flow rate, etc. provide environmental background data and assist in pollution tracing. Equipment status monitoring Real time monitoring of the operating status (start stop, power, faults, etc.) of the oil fume purifier and fan through current transformers or Hall sensors to ensure the normal operation of the purification equipment. 2、 Intelligent warning and alarm function Real time warning for exceeding standards When the concentration of oil fumes, particulate m...

Functional characteristics of air micro stations

2025-08-06

As a miniaturized and intelligent air quality monitoring device, air micro stations have multiple advanced functional features and can meet diverse environmental monitoring needs. The following are the main functional features of air micro stations: 1. Real time monitoring 24/7 Continuous monitoring capability: Air micro stations can continuously monitor environmental air quality 24 hours a day, ensuring the continuity and integrity of data. Real time data update: With built-in high-precision sensors, air quality data is collected and uploaded in real-time, allowing users to view the latest monitoring results at any time. 2. Multi parameter comprehensive monitoring Pollutant monitoring: It can simultaneously monitor multiple air pollutants, including sulfur dioxide (SO ₂), nitrogen dioxide (NO ₂), ozone (O3), carbon monoxide (CO), PM2.5, PM10, and volatile organic compounds (TVOC). Meteorological parameter monitoring: It can expand the monitoring of meteorological parameters (temperature, humidity, wind speed, wind direction, atmospheric pressure) and environmental parameters such as noise, providing users with more comprehensive environmental data. 3. High precision and high reliability Advanced sensor technology: using high-precision sensors such as electrochemistry, laser scattering, and ...

Working principle of CEMS system

2025-08-06

The working principle of CEMS (Continuous Emission Monitoring System) is based on physical and chemical sensor technology, as well as data acquisition and transmission technology. Through sampling, preprocessing, analysis, data acquisition and transmission, it achieves continuous monitoring of flue gas emissions. The following is a detailed introduction to its working principle: 1、 Sampling and preprocessing Sampling: The CEMS system extracts flue gas samples from the flue through sampling probes. Sampling probes are usually equipped with ceramic or stainless steel filters to filter out dust in flue gas, preventing it from entering subsequent equipment and causing blockage and damage. Preprocessing: The extracted flue gas samples need to undergo pretreatment, including heating, transportation, filtration, and condensation steps. Heating and conveying are used to prevent condensation of water vapor in flue gas and avoid interference with subsequent analysis; Filtering is to further remove particulate matter from the flue gas; Condensation is used to lower the temperature of the flue gas for subsequent analysis. 2、 Gas analysis The preprocessed flue gas sample is sent to a gas analyzer for various component analyses, such as SO ₂, NOx, O ₂, etc. Gas analyzers use various technologies, including b...

Composition of VOCs online monitoring system

2025-08-06

The VOCs online monitoring system usually consists of a sampling unit, a preprocessing unit, a gas analysis unit, a data acquisition and transmission unit, an auxiliary unit, and monitoring software. Each unit works together to achieve real-time monitoring and data management of VOCs. The following is a detailed introduction to each component: 1. Sampling unit: Sampling probe: responsible for collecting gas samples from flue gas or air, usually made of high temperature and corrosion-resistant materials such as stainless steel to ensure normal operation in harsh environments. The sampling probe has a filtering function, which can preliminarily filter the particles in the flue gas to prevent them from entering the subsequent equipment and causing blockage and damage. Heat tracing pipeline: Due to the tendency of VOCs to condense into liquid form or adsorb on the inner wall of the pipeline at room temperature, the function of the heat tracing pipeline is to maintain the temperature of the gas, keeping it in a gaseous state for easy transmission and measurement. Heat tracing pipelines generally use heating wires or heat tracing pipes to maintain a constant temperature through a temperature control system. 2. Preprocessing unit: Dust removal device: removes impurities such as particulate matter and ...

Key points for selecting flow meters

2025-08-06

Measurement requirements: Select the appropriate type of flowmeter based on measurement accuracy requirements. Fluid characteristics: Consider the influence of fluid viscosity, density, temperature, pressure, and other characteristics on measurement results. For example, high viscosity fluids may not be suitable for using turbine flow meters or electromagnetic flow meters; Fluids containing solid particles may clog certain types of flow meters. Installation conditions: Select the appropriate type and installation method of flowmeter according to the installation environment. For example, in situations where non-contact measurement is required, ultrasonic flow meters can be chosen; In situations where space is limited, compact flow meters can be chosen. Economic factors: Considering the cost and maintenance expenses of the flowmeter while meeting measurement needs. The prices of different types and brands of flow meters vary greatly, and it is necessary to choose according to actual needs....

Technical principle of pressure transmitter

2025-08-06

A pressure transmitter is an industrial automation instrument that converts pressure signals into standard electrical signals (such as 4-20mA DC, 0-10V DC, or digital signals). Its technical principles can be summarized into four core links: pressure sensing, signal conversion, signal amplification and processing, output and transmission, as follows: 1、 Pressure sensing The core of a pressure transmitter is the sensor, which is responsible for directly sensing changes in external pressure. Common types of sensors include: Piezoresistive sensor: utilizing the piezoresistive effect of semiconductor or metal materials. When pressure is applied to the sensor diaphragm, the diaphragm undergoes deformation, causing a change in the internal resistance value. Convert resistance changes into voltage signals through a Wheatstone bridge. Capacitive sensor: composed of two parallel electrode plates. Pressure causes a change in the capacitance value between the diaphragm electrode and the fixed electrode, which is then converted into an electrical signal. Piezoelectric sensor: Utilizing the characteristic of piezoelectric materials (such as quartz crystals) generating charges under pressure, it outputs an electrical signal proportional to the pressure. This type of sensor is suitable for dynamic pressure me...