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Advantages of float level switch: The float switch does not contain components such as bellows, springs, and seals that may cause malfunctions. Instead, a straight float is used to drive the magnet inside the switch, and the simple lever of the float switch makes the switch act instantaneously. The float cantilever angle limit design prevents the float from becoming vertical. The float level switch is a liquid level controller with a simple structure, easy to use, safe and reliable. It is faster than ordinary mechanical switches and has a longer working life; compared with electronic switches, it has the characteristics of strong resistance to load impact, and one product can achieve multi-point control. Easy to maintain. Widely used in shipbuilding, papermaking, printing, generator equipment, petrochemical industry, food industry, water treatment, electrician, dye industry, hydraulic machinery, etc. shortcoming: The float switch is a simple passive device and does not have a self-checking function, so it is recommended to perform regular inspection and maintenance. Floats or displacer level gauges are moving parts and therefore can become contaminated when used in thicker or viscous liquids. The measurement accuracy is poor, the viscosity is 2, and there are requirements for the pressure, density, and dielectric constant in the container. The installation requires stopping production, cleaning the tank, opening holes, and starting a fire. Advantages of ultrasonic external liquid level switch: Dinghua Electronics' ultrasonic external liquid level switch is a non-contact measurement method with high accuracy.: ±1~±5mm accuracy, it is widely used due to its advantages of strong safety, reliability, high stability, simple installation and maintenance. 1. Safety: When measuring liquids that are toxic, corrosive, pressurized, flammable, explosive, volatile, and leaky, no valves, connecting pipes, or joints are used. There are no leaks, and no contact with liquids and gases in the tank. It is very safe. Even if the instrument is damaged or repaired, there is no possibility of leakage, poisoning or explosion. 2. Easy to install and maintain: During installation and maintenance, there will be no fire, no clear tank, and no impact on production. 3. Reliable and durable: There are no mechanical moving parts in the sensors and instruments, and they are strictly sealed and isolated from the outside world and will not wear or corrode. 4. Widely applicable: It has nothing to do with the pressure, temperature, density, dielectric constant, viscosity and corrosiveness of the medium being measured. It can be widely used in petrochemical, chemical, oil depot, petroleum, electric power, liquid storage and transportation, pharmaceutical and other industries. Advantages of radio frequency admittance level switch: 1. Strong versatility: It can measure liquid level and material level, can meet the measurement requirements of different temperatures, pressures, and media, and can be used in harsh situations such as corrosion and impact. 2. Anti-hanging material: The unique circuit design and sensor structure enable measurement without being affected by sensor hanging materials, eliminating the need for regular cleaning and avoiding mismeasurements. 3. Maintenance-free: There are no moving parts in the measurement process, there is no problem of damage to mechanical parts, and no maintenance is required. 4. Anti-interference: Contact measurement, strong anti-interference ability, can overcome the influence of steam, foam and stirring on measurement. 5. Accurate and reliable: The measurement quantity is diversified, making the measurement more accurate. Zeliang is not affected by environmental changes, has high stability and long service life. 6. Scope of application: Chemical industry, oil field, water and sewage treatment, paper making, pharmaceutical, power plant, metallurgy, cement, grain and other industries. Advantages of paddle type liquid level switch: 1. Small hopper professional technology, three bearing support, more reliable operation ； 2. Original sealing design prevents dust from penetrating (patented actual) ； 3. The torque is stable and reliable and the torque size is adjustable. ； 4. When the blades bear excessive load, the clutch will automatically slip to protect the motor from damage. ； 5. Mechanical and electrical separation structure, no need for disassembly and easy maintenance. ； 6.Junction box IP65 technical indicators: 1. The material is dry powder or granular, and the maximum allowed material particle size is 20mm2. The bulk density of the material is ≥0.5g/cm33. Material temperature: a. Normal temperature b. High temperature ≤ 185℃ 4. Control method: Position type 5. Power supply: 220V.AC, 50Hz 6. Output contact capacity: 250V.AC,5A7.Lifespan: Mechanical 5×107 times Electrical 5×105 times 8. Rotation speed: 6 rpm 9. Power consumption: 4W10.Use ambient temperature: -10～+55℃11.Relative humidity: Not more than 85% Advantages of electromagnetic liquid level switch: Electronic type with overvoltage protection function ； The electromagnetic leakage current protection can reach 300MA, has multi-level breaking range and is widely used. Advantages of electronic liquid level switch: It is resistant to dirt, rolling, bumping, falling, salt spray, acid and alkali, and is not afraid of the influence of magnetic fields, metal bodies, water pressure changes, or light. It has no blind spots, no external moving parts, and is not afraid of the influence of solid floating objects. Scope of application: Clean water, various sewage, acid and alkali water, sea water, water treatment chemicals, river water, textile printing and dyeing water, industrial wastewater, and is also suitable for ship water level switches and other photoelectric liquid level switches.: No mechanical moving parts, high reliability ； Small size and high cost performance ； Liquid level control has high precision and good repeatability. shortcoming: Not suitable for frozen liquids and crystallized liquids. Several classic cases 1. Common faults and solutions of float level switches: Float does not move: ①The specific gravity of the liquid is less than the specific gravity of the float ② The float leaks ③ How to deal with foreign objects stuck in the float: ①Reconfirm the specific gravity of the float ② Contact the company to replace the float ③ Clear foreign matter The float moves, but there is no signal output: ①Float position deviation ② How to deal with damage to the reed switch: ①Adjust the float position ② Replace the reed switch. The signal output is abnormal and there is magnetic field interference nearby. Treatment method: The magnetic field signal is maintained and cannot be restored, the float cannot return, and there is a foreign object stuck. Treatment method: When the foreign matter is removed, there will be two signal outputs, and the ring position will move. Treatment method: Adjust the ring buckle position 2. Tuning fork level switch The tuning fork level switch has poor impact resistance and cannot be squeezed hard because it cannot resonate after deformation. It can be installed with high material levels, but cannot be used with low material levels. The inlet and outlet should be avoided during installation. If not, a baffle must be installed. The medium measured by the tuning fork cannot have adhesion. If the material adheres to the tuning fork, it will change the inherent vibration frequency of the tuning fork and easily cause failure of resonance. 3. Analysis and treatment of common faults of external liquid level switch: 1. False alarms caused by missing parameters ； 2. Long-term coupling agent loss causes false alarms ； 3. Failure to perform double calibration (only perform calibration) when there is liquid present may lead to false alarms. Solution: 1. Contact the manufacturer for instrument upgrade ； 2. Re-apply coupling agent, and then perform calibration and debugging ； 3. If there is liquid, it is best to do double calibration and debugging.