Ultrasonic water level sensor:
The ultrasonic water level sensor emits a pulse, the sound wave is reflected by the liquid surface and converted into an electric signal by the ultrasonic receiver, the distance between the sensor and the surface of the liquid to be measured is calculated from the time between the emission and reception of the sound wave.
If there is an obstacle under the level sensor, ultrasonic level switch can not be used. The obstacle will affect the ultrasonic emission and cause signal loss; the obstacles need to be adjusted or avoided. Ultrasonic liquid level sensor can not be used to measure a large amount of foamy and volatile liquids. Temperature, dust, water mist and pressure will affect the ultrasonic measurement. These factors should be paid attention to when using the ultrasonic liquid level sensor.
Photoelectric tank level switch:
The light emitted by the light-emitting diode inside the photoelectric level sensor is introduced into the lens at the top of the sensor. When there is no liquid, the light from the LED is reflected directly from the lens back to the receiver. When there is a water state, the light is refracted into the liquid so that the receiver does not receive or can only receive a small amount of light.
The photoelectric liquid level switch uses the principle of optical reflection to measure, the performance of level sensor will be affected when it is exposed to direct sunlight or other infrared interference. Adjust the mounting angle or use a hood to avoid it.
When the liquid level fluctuates or there is water vapor, water drops on the probe, it may cause the sensor to misjudge, we can provide a corresponding solution for you to choose.
The photoelectric lliquid level switch has high precision, low price, high reliability and wide application environment, it is less affected by strong acid, alkali and viscosity. Photoelectric level sensors can be used for higher liquid level accuracy requirements.
Capacitance level transmitter:
Capacitive sensing principle is as follows, when the height of the measured medium changes, the sensor capacitance also changes, the change of the capacitance is converted into a standard current signal.
Capacitance level transmitter can not be used in matel material water tank and too thick container. The type level sensor will be recommend if the tank can not be opened.
Vertical float switch:
The float moves up and down through the buoyancy of the liquid, so that the internal reed switch is turned on and off, but the working principle and collection method are backward.
The magnetrol float level switch cannot be used in liquids with high impurities and high viscosity. Impurities and viscous liquids can cause the float to stuck.
The liquid level float switch accuracy is low, this type level sensor is not recommended for high precision requirements. Float level sensing is cheap, but it has low reliability.