The water level sensor is an instrument that can convert the water level parameters of the measured point into the corresponding electrical signal in real time.Its working principle is: the water level sensor in the vessel transmits the sensed water level signal to the controller, and the computer in the controller compares the measured water level signal with the set signal to obtain the deviation, and then according to the nature of the deviation, sends the opening and closing instructions to the water supply electric valve to ensure that the vessel reaches the set water level.After the water inflow procedure is completed, the computer in the temperature control part sends an open command to the electric valve supplying heat medium, so the system starts to heat the water in the container.When the set temperature is reached.Only when the controller sends the order of closing the valve and cutting off the heat source, the system enters the thermal insulation state.During programming, ensure that the system can control the heat source without reaching the safe water levelElectric control valveThe valve is not opened, thus avoiding heat loss and accidents.
The sensor is an instrument that can sense the water temperature and water level, and convert the sensed water temperature and water level into changing electrical signals.staysolar heaterIn the history of development, the water temperature and water level sensor has always played a pivotal role. The intelligence and humanization of the water heater are inseparable from the water temperature and water level sensor. The water temperature and water level measurement and control instrument is inseparable from the water temperature and water level sensorsensorStable operation is the guarantee for intelligent control of the whole water heater.The development of water temperature and water level sensors from scratch, from simple to complex, and from short to long service life, is inseparable from the efforts of solar professionals[1]。
application
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It is widely used in water plants, oil refineries, chemical plants, glass plants, sewage treatment plants, high-rise water supply systems, reservoirs, rivers, oceans, etc. to measure and control water supply pools, distribution pools, water treatment pools, wells, water tanks, water tanks, oil wells, oil tanks, and static and dynamic liquid levels of various liquids.
The water level sensor in the vessel transmits the sensed water level signal to the controller, and the computer in the controller compares the measured water level signal with the set signal to obtain the deviation. Then, according to the nature of the deviation, it sends the "open" and "close" commands to the electric water supply valve to ensure that the vessel reaches the set water level.After the water inflow procedure is completed, the computer in the temperature control part sends an "open" command to the electric valve supplying heat medium, and the system starts to heat the water in the container.When the set temperature is reached.Only when the controller sends the order of closing the valve and cutting off the heat source, the system enters the thermal insulation state.During programming, ensure that the system can control the heat source without reaching the safe water levelElectric control valveDo not open the valve, thus avoiding heat loss and accidents[2]。
High temperature resistance
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The sensor needs to work in the water tank of the water heater for a long time. Because the vacuum tube has a large amount of heat, it transmits a lot of heat to the water tank of the water heater, making the temperature of the water tank reach about 100 degrees for a long time, 130 degrees for a short time, or even 150 degrees. This has brought about the problem of high temperature resistance to the sensor. From the first water temperature and water level sensor used in the solar energy industry to the near future,The sensor materials have always had defects in high temperature resistance. In the long-term air drying process, in the long-term water boiling process, and in the long-term steaming process, whether electronic devices or other sensor materials are easy to aging and damage.
To overcome this problem, the sensor part entering the water tank must be able to withstand high temperature. Under the background of rapid scientific development, China has developed a high temperature resistant polypropylene material that can insulate and withstand high temperature. It can be used normally in an environment of 150 ℃, and can withstand high temperature of 170 ℃ in a short time. The conductive electrode part uses high-quality stainless steel material SUS316L,It can not only meet the requirements of high temperature resistance, but also meet the requirements of corrosion resistance;For the circuit not resistant to high temperature, the structure far away from the high temperature water tank can be selected[3]。
