
Level Switches

Level switches are a category of sensor devices used to determine the level of liquids, powders, or granular materials stored in a tank, bin, or other containment vessel. These devices operate by triggering an output signal when the material or liquid reaches a specific level, which can then be used to control a process or provide feedback.
Level switches can be used in various applications, from simple applications such as controlling a pump, to more complex uses like inventory management or interactive feedback in a closed-loop system.
The selection of the level switch will depend on several factors, such as the nature of the liquid or solid (conductivity, temperature, pressure, density), the required precision, whether the raw materials are in hazardous environments, the size of the tank, whether point or continuous level detection is required, and cost considerations. Always consult with the manufacturer or an industry expert for suitable solutions based on specific requirements.
Products
More Information about Level Switches
Float Level Switches
Float Level Switches contain a magnet within a float that rises and falls with the liquid surface. When the float rises to a specific level, it actuates a reed switch inside the stationary stem to trigger an output signal. A float level switch is cost-effective, reliable, and is often used in water and wastewater treatment, oil and gas industry, and process industries.
Point level switches
Point level switches, also known as level sensors, are designed to signal the presence or absence of a liquid at a certain level. They are typically installed at high or low points in a tank wall and can provide a binary (on/off) signal.
Capacitive level switches
A capacitive level switch operates by measuring changes in an electrical property known as capacitance. Capacitance changes with variations in the level of a material, such as a liquid or bulk solids. This change can then be used to activate a switch.
Rotating Paddle and Tuning Fork Switches
Rotating Paddle and Tuning Fork Switches are used for bulk solids, such as grains or powders. A rotating paddle switch spins freely until the level of solid material rises to stop the paddle. A tuning fork switch uses a vibrating fork that changes frequency when material covers it.
FAQs
What are conductive level switches?
Conductive level switches, also known as conductive level sensors, are devices that use the conductive properties of the process fluid to complete an electrical circuit. They work by sending a low-voltage, low-current AC signal from the sensor into the conductive liquid. When the liquid comes into contact with the sensor, the circuit is completed, which changes the state of the switch.
What is feedback resonant frequency?
Feedback resonant frequency typically refers to the natural frequency at which a system with feedback oscillates. In the context of sensor technology, this is commonly encountered in certain types of level switches, such as tuning fork level switches.
Transmitters vs Transducers
Some of the most common types of transmitters and transducers can be found on pressure instruments. Examples of these include: drop-in well pressure devices and devices that measure the pressure in a pipe or gas chamber. Transmitters and transducers can also be found on flow and speed measurement devices.
What is the difference between transmitters and transducers?
The main difference is the way they send data to the monitoring device, like a PLC. In terms of measurement, the transmitter will reference a measuring unit by sending a milliamp signal (such as 4-20 mA). A transducer will reference a measuring unit by sending a voltage signal, typically in volts or millivolts.
Why have the two different types of transmission methods?
The method will depend on the application. If the electrical connection in the application travels a short distance, a pressure transducer is the better choice. Pressure transducers are smaller with fewer active electronic components that can be upset by electromagnetic interference. Also, the voltage signals transmitted over longer distances are subject to voltage drop and signal corruption. A transmitter is better for transmitting signals over a long distance.