1 Introduction The FLT93M switch with Flexswitch technology represents the true technological advancement of FCI's level switches. This simple device, which can be set in the field, offers unmatched precision, flexibility and stability in most liquid level switch applications, and can be flexibly applied to liquids such as gases, liquids, slurries, and foams. Bit measurement or flow measurement. This type of heat-dissipating liquid level switch has high reliability and simple adjustment, and has been more and more widely used in the engineering community.
2 Working principle The sensing element of FCI's heat-diffusion level switch consists of two platinum RTD temperature-sensitive elements protected with a stainless steel sleeve. One is the unheated head, which senses the temperature of the medium; the other is the heated head, which is heated by the circuit section. There is a temperature difference (resistance difference) between the two platinum RTD sensor heads. This temperature difference is converted into a voltage signal by the circuit. In different media, such as water, oil, and air, the thermal conductivity of the media is not the same. The thermal conductivity of water is the best, followed by oil, and air is the worst.
Because of different thermal conductivity characteristics of different media, the output voltage of FLT93M composite switch in different media is different. By setting different voltage values, the corresponding contact actions can be controlled to determine the media in which the sensor head is immersed. in. Each FLT93M level switch can set two set points.
3 Application in water treatment systems The water treatment system is responsible for the water supply tasks of the entire rolling mill. Figure 1 shows the process flow of water treatment, which mainly consists of sedimentation tanks, sewage suction wells, filters, water purification wells, water pumps, and dosing equipment. The equipment that needs to be monitored mainly includes water absorption wells (water level), water pumps, inlet and outlet water pipes (water pressure, water flow, water temperature), filters, and safety water towers.
The water quality of water treatment wells and water towers is too bad. The original plug-in level switch probes are often clogged and fouled, resulting in inaccurate detection. Maintenance personnel can not ensure accurate detection after an average of three clean-ups a week, which will greatly affect production and maintenance. Difficulties, and due to frequent cleaning, the level switch is often damaged. After switching to the FLT93M level switch, after nearly two months of trial, the test value is accurate, completely solve the problem of inaccurate detection of the original liquid level switch, and provide favorable protection for production.
4 Advantages of Thermal Diffusion Level Switch (1) The thermal diffusion level switch is all welded structure, no moving parts, no mechanical failure, and the sensor head has self-cleaning function, no other insertion will occur Product-prone scaling phenomenon.
(2) Simple installation, screw or flange mounting. Wide adaptability range, high temperature or high pressure will not affect its use.
(3) The sensor head can be made of different corrosion-resistant metal materials to adapt to various complex media.
(4) The principle of measurement is to measure the difference in thermal conductivity of different liquids and use it in liquids with different densities and thermal conductivity.
(5) High reliability and intuitive instructions.
(6) Long service life. In some industrial sites, switches operating for several decades are still working.
2 Working principle The sensing element of FCI's heat-diffusion level switch consists of two platinum RTD temperature-sensitive elements protected with a stainless steel sleeve. One is the unheated head, which senses the temperature of the medium; the other is the heated head, which is heated by the circuit section. There is a temperature difference (resistance difference) between the two platinum RTD sensor heads. This temperature difference is converted into a voltage signal by the circuit. In different media, such as water, oil, and air, the thermal conductivity of the media is not the same. The thermal conductivity of water is the best, followed by oil, and air is the worst.
Because of different thermal conductivity characteristics of different media, the output voltage of FLT93M composite switch in different media is different. By setting different voltage values, the corresponding contact actions can be controlled to determine the media in which the sensor head is immersed. in. Each FLT93M level switch can set two set points.
3 Application in water treatment systems The water treatment system is responsible for the water supply tasks of the entire rolling mill. Figure 1 shows the process flow of water treatment, which mainly consists of sedimentation tanks, sewage suction wells, filters, water purification wells, water pumps, and dosing equipment. The equipment that needs to be monitored mainly includes water absorption wells (water level), water pumps, inlet and outlet water pipes (water pressure, water flow, water temperature), filters, and safety water towers.
4 Advantages of Thermal Diffusion Level Switch (1) The thermal diffusion level switch is all welded structure, no moving parts, no mechanical failure, and the sensor head has self-cleaning function, no other insertion will occur Product-prone scaling phenomenon.
(2) Simple installation, screw or flange mounting. Wide adaptability range, high temperature or high pressure will not affect its use.
(3) The sensor head can be made of different corrosion-resistant metal materials to adapt to various complex media.
(4) The principle of measurement is to measure the difference in thermal conductivity of different liquids and use it in liquids with different densities and thermal conductivity.
(5) High reliability and intuitive instructions.
(6) Long service life. In some industrial sites, switches operating for several decades are still working.
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