The difference between liquid level sensor / liquid level switch / liquid level controller / liquid level transmitter / liquid level gauge

What is the difference between a level sensor and a level switch, level transmitter, level controller, level gauge? Liquid level sensor The liquid level sensor is a common sensor that measures the liquid level position, which converts the height of the bit into an electrical signal for output. The liquid level sensor is a modular circuit, which has the advantages of acid resistance, moisture resistance, shock resistance and corrosion resistance. The circuit contains a constant current feedback circuit and an internal protection circuit, which can reliably protect the power supply and prevent the secondary instrument from being damaged. Therefore, liquid level sensors are widely used in medical, chemical, automotive, home appliances and other industries, such as water heaters, washing machines, coffee machines, milk machines, electric steamers, aromatherapy machines, face spray machines, power batteries, medical equipment, etc. In general, it is used in electrical appliances and equipment that require water level control. The common types of liquid level sensors are: radar liquid level sensor; liquid floating ball liquid level sensor; static pressure liquid level sensor; capacitive liquid level sensor; photoelectric liquid level sensor; ultrasonic liquid level sensor. Liquid level switch The liquid level switch is a switch used to control the liquid position. When the measured liquid medium reaches a certain indicated position, the liquid level switch will output an alarm signal according to its working principle, thereby stopping the continuous delivery of the liquid medium; when the measured liquid medium is lower than a certain set position, the liquid level switch will also An alarm signal will be output to remind the headquarters to open the gate and start delivering liquid. For example: such as the water level of the water tank, when the water level is full, the float ball or the float touches the switch to turn on the switch and send out an audio signal or a control signal, which is a switch signal. If a sensor is used, the sensor can send out an electrical signal quantity that cannot be connected according to the change of water level. For example, the output is a standard signal of 4ma ~ 20ma, when the water level is the lowest, it outputs a 4ma current, and when the water is full, it outputs a 20ma current. Difference: Although the principle of liquid level switch and liquid level sensor is the same. However, the liquid level switch is a switch control circuit, and the liquid level sensor is a circuit element equivalent to a voltage change and a current change. That is to say, if you want to measure when the liquid has reached the liquid level, use the liquid level switch, and to accurately measure the height of the liquid level, use the liquid level sensor. However, the two can sometimes be used interchangeably. Liquid level controller Liquid level controller, also known as water level switch, is mainly used to control the liquid level switch, mainly divided into contact and non-contact liquid level switches. Its working principle is to control the high and low liquid levels by mechanical or electronic methods, and can control solenoid valves, water pumps, etc., so as to achieve semi-automation or full automation. It is worth noting that the float of the liquid level controller is susceptible to External sundries affect its stability, especially fibrous sundries entangle and make mistakes. It is not advisable to use more than one in the same small water tank, otherwise they will be entangled. The service life is relatively short, and most of them are directly connected to 220V. There are certain safety hazards. One day, there will be electric leakage due to broken wires. Therefore, the power cord of the float switch is an integral part of the device. Once the cord is found to be damaged, the device should be replaced, and repairs to the cord are not allowed. Difference: There is still a difference between the liquid level sensor and the liquid level controller. The liquid level sensor is only a single product, and it is a product that achieves the effect. The liquid level controller needs to use the signal sent by the sensor to control other equipment to start. Stop, the two should be connected together, the sensor provides signals to the controller, and then controls the work of the equipment. It's a tandem working relationship. Liquid level transmitter The liquid level transmitter is the extension and development of the pressure transmitter technology. According to the principle that the pressure generated by the liquid of different specific gravity at different heights is linear, for example, when the two pressures of the measured medium pass into the high , The two low pressure chambers act on the isolation diaphragms on both sides of the delta element (ie the sensitive element), and are transmitted to both sides of the measuring diaphragm through the isolation diaphragm and the filling liquid in the element to realize the protection of water, oil and paste. Accurate measurement and delivery of volume, liquid height, and weight. The difference: the liquid level sensor, which emphasizes the detection of the liquid level signal. For example: the float in the float type liquid level transmitter is the so-called 'liquid level sensor', its function is to float with the liquid level, and the upper and lower distance of the float is used to indicate the liquid level. The liquid level transmitter emphasizes 'change' and 'send'. For example, when the float moves up and down with the liquid level, an electrical signal of position will be generated in a metal tube, and this process is 'change'. And this electrical signal is often irregular in size, and cannot even be used for future circuits. For this reason, a circuit is installed near the tube, the purpose is to convert this non-standard electrical signal into a standard electrical signal (such as 4-20MA, 0-10V, etc.), which can be output to other instruments or devices for display or control. This device is called a 'liquid level transmitter'. The level of the liquid medium in the container is called the liquid level,The instrument that measures the liquid level is called a liquid level gauge. The liquid level gauge is a kind of instrument specially used to measure the high and low position of the liquid level. The position of the measured liquid medium in the container (including tanks, storage tanks, spherical tanks) is called the liquid level, and the instrument that measures the liquid level is called 'liquid level gauge'. Compared with the liquid level switch, the working principle of the liquid level gauge is relatively simple. Liquid level gauges include tuning fork level gauges, float level gauges, magnetic flap level gauges, ultrasonic level gauges, radar level gauges, and more.
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