Metering Pumps
A metering pump is a precision mechanical device that moves or pumps a measured amount of a fluid or liquid in a predetermined time period to create an accurate and exact volumetric flow...
Level Switches: Types, Uses and Functions
Introduction
This article takes an in depth look at level switches and their use.
You will learn more about topics such as:
- What is a Level Switch
- Uses for Level Switches
- Types of Level Switches
- How Level Switches Work
- And much more �
Chapter One � Understanding the Function of a Level Switch
A level switch is a device—either electrical or mechanical—that helps monitor the levels of liquids, powders, or bulk materials. Its purpose is to activate an alert when the contents inside a container hit a predetermined height or depth. When the level switch senses the tank is at capacity, it signifies full or upper-level detection. On the other hand, if the substance level drops below a specific threshold, indicating a nearly empty tank, the switch sends a low-level or empty detection alert.
Level switches play a vital role in production processes, especially in challenging environments characterized by extreme temperatures, pressures, and constant vibrations. Their flexibility makes them suitable for measuring a wide array of products across different settings. The precision, dependability, and robustness of level switches are critical for ensuring the smooth operation and efficiency of industrial applications.
Chapter Two � What are the types of level switches?
Level switches, also known as liquid level sensors or level detectors, come in various types to suit different products and industrial applications. These essential instruments act as measurement devices, liquid level monitoring controls, or warning alarms—such as signaling when to activate or deactivate a pump, valve, or other mechanism in process automation. Depending on their construction, level switches can have either mechanical or electrical outputs, and can be configured as normally open (NO) or normally closed (NC) systems for integration with industrial control systems.
Among the many types of level switches, the most commonly used include inductive, thermal, float, rotating paddle, and ultrasonic switches. These are typically employed in tanks, silos, and various storage bins for level sensing and inventory management. For fluid level measurement and process control, level switches are often integrated into industrial process control valves or pumps to help regulate tank levels, prevent overflows, and maintain consistent operation. Certain level sensors are also applied to hazardous area applications, such as monitoring the levels of flammable liquids or corrosive chemicals, where explosion-proof or intrinsically safe models are critical for plant safety.
Level switches are categorized into point level detectors and continuous level measurement devices. Point level switches detect predefined threshold levels and include optical sensors, horizontal float switches, vertical float switches, and ultrasonic varieties for both solids and liquids. Continuous level switches, also known as level transmitters, enable real-time tank level monitoring and include submersible sensors, guided wave radar, ultrasonic, magnetostrictive, and capacitive models. The selection of an optimal level switch depends heavily on specific measurement requirements such as the state of the media (liquid, slurry, or powder), tank configuration, environmental conditions (temperature, pressure, corrosiveness), and the desired type of output signal (analog or digital) suitable for SCADA, PLC, or building management systems.
Users often search for:
- Best level switch for water tanks or chemical process tanks
- Difference between point level and continuous level measurement
- How to select a liquid level sensor for corrosive environments
- Comparison of float switches vs. ultrasonic level switches
- Setting up alarm systems for tank overfill protection
When evaluating and purchasing a level switch, consider not just the type of liquid or solid, but also the required response time, output options (relay, analog 4-20mA, digital MODBUS), installation method (top-mounted, side-mounted, inline), and compliance with safety standards such as ATEX, FM, or IECEx for hazardous locations.
Level Switch Types
Capacitive Level Switch
Capacitive level switches are designed to measure corrosive liquids, high temperatures, and liquid levels within sealed containers. They operate based on the principle of capacitance and are highly effective for non-contact level detection and applications involving aggressive chemicals or viscous media. These switches feature an electrode that adjusts its capacitance—its electrical charge ratio—as the level of the medium changes. This variation in capacitance is converted into a current signal or voltage signal, which can be sent to a secondary instrument, SCADA system, or process control computer for automated tank monitoring.
Conductivity Level Switches
Conductivity level switches utilize advanced and highly sensitive probes or sensors to detect even minor changes in liquid levels. These point level switches feature conductive probes with insulated electrodes, leaving only the tips exposed to prevent electrical bridging. The electrodes operate by measuring variations in electrical resistance or conductance between them, with one probe serving as the reference and the other as the level control electrode. These are particularly suitable for water-based solutions, wastewater, and other electrically conductive media.
The conductivity electrodes detect resistance levels when they come into contact with the medium. In some configurations, an electrically conductive tank wall can substitute for one of the electrodes, reducing installation complexity.
Diaphragm Switch
A diaphragm level switch, or pressure switch with diaphragm element, measures pressure changes due to the rising or falling level of a solid or liquid material. As the level increases, the air or material pressure rises, causing the diaphragm's face to move under the pressure and activate a micro switch or relay. When the pressure decreases, the diaphragm returns to its original position. Diaphragm level switches, featuring electrical contact outputs, are widely used across industrial applications including granular material storage, silo automation, and hopper level detection, due to their reliability and simplicity.
Displacer Level Switch
Displacer level switches are engineered to operate in environments with high temperatures and pressures, making them ideal for industrial process control and steam applications. These robust devices have a weight—called the displacer—suspended on a spring, which is heavier than the medium being measured. When the process media makes contact with the displacer, buoyancy force is produced that changes the weight and causes the spring to retract. As the spring retracts, it sends a magnet upward that actuates the switching element, providing a mechanical or electrical signal to indicate level changes.
In certain setups, three or more displacer level switches can be employed within a single vessel to monitor a medium at different thresholds, offering reliable multi-point level detection.
Float Level Switch
A float level switch is a widely used, cost-effective mechanical level switch that floats on the surface of the media and moves up or down as the media rises or falls. Float switches are frequently used with sump pumps, valves, or alarm panels for liquid level control in water tanks, oil tanks, and industrial process tanks. Their simple design provides high reliability and versatility across multiple media types, including water, oils, and some chemicals.
A float switch is built with a hollow body that houses a switch or sensor, typically a reed switch with an internal magnet. The switch operates by opening or closing in response to gravity and the media level. Float switches can be calibrated to activate at specific setpoints, making them ideal for both high and low level signaling. When triggered, the switch sends a signal to a controller or relay, enabling automatic pump control, valve actuation, or alarm activation for efficient process management.
Hydrostatic Level Switches
Hydrostatic level switches are threshold contact devices that contain a pressure switch or pressure sensor integrated into a solid-state NPN or PNP electronic switch. Since all liquids exert a hydrostatic pressure proportional to their height, these switches accurately measure the weight and therefore the level of the liquid inside a vessel. Hydrostatic sensors are used extensively in liquid storage applications, process tanks, and wastewater treatment plants for continuous level measurement, particularly in deep tanks or wells.
Hydrostatic level switches are typically mounted on the side or bottom of a container. They can be attached using a flange, threaded port, or sanitary sealed clamp for hygienic applications. Their robust design allows for use in challenging industrial environments subjected to vibrations or contamination.
Inductive Level Switches
Inductive level switches are non-contact level sensors that detect metallic objects or materials when they enter the sensing range. These switches employ an oscillator circuit with an open core coil to generate a focused high-frequency electromagnetic field. When the target material moves into this field, it creates eddy currents, altering the circuit’s oscillation characteristics.
This decrease in oscillation amplitude is detected by the electronic circuit, triggering a change in the switching state. Inductive sensors are widely used for detecting the presence of metallic powders, granules, or machine parts, such as in bulk material handling or bin level monitoring, and provide reliable operation even in dusty or vibrating environments common in manufacturing plants.
Laser Sensor
A laser sensor is a highly precise, non-contact level switch that measures levels by using the speed of light. Operating from the top of the container, a laser transmitter sends a short pulse of light toward the surface of the process material. The light is reflected back to its detector, and the time-of-flight (ToF) is calculated by the sensor’s timing circuit. Laser level sensors deliver exceptional precision and speed, making them suitable for high-value liquids, chemical dosing, or applications requiring fast and repeatable level measurements.
Laser sensors are advantageous due to their extremely focused beam and minimal risk of false echoes, which enables effective operation in silos, narrow vessels, or where foam, vapors, or obstacles may interfere with other types of sensors. These sensors are increasingly used in remote monitoring and IoT-enabled plant automation systems.
Magnetostrictive Level Switch
A magnetostrictive level switch measures fluid levels by detecting the precise position of a float-mounted magnet and transmitting this data to a control system. This method combines principles of buoyancy, magnetostriction, and precision electronics. The float moves up and down with changes in liquid level along the transmitter stem, which contains a magnetic element for position detection.
In operation, an electrical current pulse travels down the magnetostrictive sensor wire, and when it reaches the float’s location, a return signal is generated. A timing circuit measures the interval, providing accurate information to determine the float’s position and therefore the precise fluid level. Magnetostrictive level sensors are popular in inventory management systems and automated tank gauging (ATG) for fuel storage tanks, chemical plants, and refineries due to their high reliability and minimal maintenance.
Microwave Level Switches
Microwave (radar) level switches are non-contact devices that use a microwave (or radar) beam transmitted in bursts—typically at high frequencies—between a sender and receiver. If the path of the beam is interrupted (absorbed or reflected) by process material, the relay is activated, signaling a level change. Microwave sensors are especially valuable in environments where mechanical or contact sensors would be eroded or damaged, including applications with aggressive chemicals, abrasive powders, or bulk solids.
These sensors excel in harsh environments—such as cement plants, mining, power generation, and chemical processing—where elevated temperatures, extreme pressure, dust, or vapor would defeat more conventional level measurement technologies.
Optical Level Switch
An optical level switch utilizes light reflection within a prism, offering high performance in both high temperature and pressure process environments. Optical switches function effectively for both point and continuous level measurement of solids and liquids. An infrared (IR) LED emits light towards a cone-shaped prism interface: when above the liquid, the light is reflected back; when submerged, refraction changes, and no light is returned—activating the switch or alarm output.
Commonly used in ultra-pure water systems, chemical dosing skids, and hazardous or sanitary (food and beverage) processing, optical level switches offer fast response times and zero moving parts, making them maintenance-free and ideal for demanding or contamination-sensitive applications.
Paddle Level Switch
A paddle level switch features an electric motor that rotates a metal paddle at a consistent, slow speed. When bulk materials make contact with the paddle, a load is exerted, increasing the torque measured by an integrated torque switch. Once the paddle encounters sufficient resistance, the switch is actuated, triggering an alarm or process action.
Paddle level switches are designed for point level detection in powder, grain, or dry bulk materials. Their robust construction and simple mechanics make them reliable for overfill protection, bin level control, and blockage detection in storage silos and hoppers, where conventional sensors might fail due to dust or material build-up.
Potentiometric Level Switches
Potentiometric level switches are continuous level measurement devices used primarily in metal containers with conductive process liquids or slurries. A low resistance measuring tube is immersed in the media; a high-frequency current is applied, and the voltage detected between the probe and tank wall is amplified and output, producing a continuous signal proportional to the liquid level in the tank. These sensors provide high accuracy in controlling difficult process liquids, adhesives, or viscous coatings.
Rod Level Switch
Rod level switches, often referred to as vibrating rod or tuning fork sensors, consist of a stainless steel rod that vibrates at a specific frequency generated by an electronic circuit. When process material—such as powder, grain, or granular solid—reaches the rod, it dampens the vibrations, signaling the control system of a level change. They are commonly utilized as high and low level indicators or for detecting clogged chutes in bulk material handling.
Rod switches are engineered to minimize material accumulation, helping to reduce false alarms and ensuring reliable process monitoring in harsh or dusty environments.
Thermal Level Switches
Thermal level switches detect variations in temperature between a gas or vapor space and the corresponding liquid below, responding to changes in thermal conductivity when a probe is submerged in fluid. These switches incorporate a heated thermal resistor or thermistor that is kept at a constant temperature. Immersion in the target liquid triggers a rapid heat loss and corresponding resistance change, activating the switch or output relay.
Various types of thermal level sensors include those with dual-resistance temperature detectors (RTDs) for more precise differential measurements. Because heat dissipates more quickly in liquids than in gases or air, thermal level switches reliably detect the presence or absence of liquids, even in high-temperature environments up to 1000°C. These are widely trusted in boiler level measurement, cooling systems, and chemical reactors for reliable overfill and dry-run protection.
Tilt Level Switches
Tilt level switches are high level indicators or spill prevention devices that are cable-suspended above the material in open bins, hoppers, or chutes. As bulk media rises, it pushes against the floating or weighted switch, causing it to tilt and trigger an alarm output. These robust switches are commonly installed to prevent bin overflow, control material levels in open pipes, or as position indicators for conveyor systems handling bulk solids or aggregates.
The sensor triggers when tilted at an angle of 17° within a 360° range, providing reliable multi-directional detection. It also features threaded bores for secure actuator attachment, enhancing accuracy and safeguarding the switch from direct impact in heavy-duty industrial environments.
Tuning Fork Level Switch
Tuning fork level switches, also called vibrating fork sensors, detect point liquid or solid levels by monitoring frequency changes as the fork oscillates. These rugged switches contain two prongs (forks) that vibrate at a fixed resonance in air. When immersed in process material with higher density—such as a liquid or solid—the vibration frequency drops. The change is sensed electronically and triggers an output signal for process control, safety shutdown, or alarm notification.
The forks are extendable from the switch housing and, when in contact with the medium, provide rapid and reliable signaling. Tuning fork level switches offer excellent performance for overflow protection, pump dry-run prevention, level alarm, and hopper empty detection in a variety of industries including food manufacturing, chemical processing, and pharmaceuticals.
Leading Manufacturers and Suppliers
Chapter Three � What are the applications of level switches?
A level switch is engineered to perform a specific function: to alert controllers when there is an issue with the level or presence of a product. It triggers an alert when the detected level deviates from the set parameters. Upon receiving this alert, the system might activate equipment such as a pump or open a valve to take corrective measures.
Essentially, a level switch adds an additional layer of protection and control, enhancing system efficiency and safeguarding sensitive components. Despite the precision of a system, errors in readings can happen. Level switches are crucial in preventing overfills, minimizing waste, and addressing other potential issues.
Applications of Level Switches
Point Level Detection
A point level detection switch is set to activate when a specific predetermined level is reached. Common types of point level switches include capacitance, ultrasonic, rotary paddle, and tuning fork or rod vibration sensors. Typically, a point level detection system includes two switches: one for monitoring the high level and another for the low level.
The high-level switch prevents the container from overflowing by signaling when it reaches its maximum capacity, while the low-level switch triggers an alert to indicate that the container is running low and needs to be refilled.
Continuous Level Measurement
Continuous level measurement switches track and report the levels of materials within a container, offering ongoing data about the level of the media. These include technologies such as microwave, ultrasonic, capacitive, and float switches. Unlike point level detectors, continuous level measurement switches provide a comprehensive overview of the entire system by monitoring various levels to generate an analog representation of the container's fill status.
Continuous level switches can be installed in either horizontal or vertical orientations. They are designed to oversee and manage materials in confined or restricted spaces, ensuring precise and continuous monitoring. This capability is crucial for processes where maintaining accurate and ongoing level data is essential for operational efficiency.
Contact Level Switches
Level switches that operate through direct contact with the substance being measured include types such as floats, conductive sensors, and vibrating or tuning fork devices. These switches offer a simple and economical solution for level measurement. Unlike their non-contact counterparts, contact level switches tend to have a more basic design and fewer features. When selecting contact level switches, it is crucial to consider the properties of the material being measured, including its corrosiveness, acidity, or reactivity. Despite their lower cost, careful selection is necessary to ensure compatibility with the medium.
These contact level switches function based on various mechanical principles and can be used to monitor both bulk solids and liquids. They operate using principles like buoyancy, employing floats, displacers, springs, or magnets to perform their measurements.
Non-Contact Level Switches
In some scenarios, it's essential to avoid direct contact with the medium due to its corrosive nature or properties that could affect the level switch's performance or accuracy. Non-contact level switches, which utilize the time of flight (ToF) method, offer a solution for continuous level measurement without physical contact with the material.
ToF technology calculates the distance by measuring the time it takes for waves to travel from the transmitter to the target and back. These devices emit either mechanical or electromagnetic waves that reflect off the surface of the material. By analyzing the time it takes for these waves to return, the distance between the sensor and the surface of the contents can be determined, indicating the level of the material in the container. For accurate readings, the medium being measured should have a low dielectric constant to minimize interference with the sensor's measurements.
Chapter Four � How a Level Switch Works?
While the operation of a level switch is relatively straightforward, it plays a crucial role in systems aimed at safeguarding both resources and equipment. For any operation involving bulk materials or liquids, managing and regulating the quantities and volume is essential. Although sophisticated software solutions exist for this purpose, level switches often serve as the primary tool for data collection and monitoring within these systems.
Level switches are vital for ensuring smooth operations and managing inventories by offering crucial data and measurements. They help identify discrepancies in volume and trigger alarms to alert users of potential issues.
Components of a Level Switch
Sensor Component
The core element of a level switch is its sensor, which can be categorized into point level detection or continuous level measurement. Point level sensors include types such as capacitance, optical, conductivity, vibrating or tuning fork, and float switches. For continuous level measurement, the sensors used are typically ultrasonic, microwave, and radar.
Point level sensors are generally compact, cost-effective, and feature a simple design with no moving parts. They come into direct contact with the material and offer high accuracy. To maintain their precision, these sensors are calibrated according to the specific level and nature of the material being measured.
On the other hand, continuous level measurement sensors are characterized by their compact size, reliability, and the absence of moving parts. They do not come into contact with the material and remain unaffected by its properties, while also being self-cleaning. Despite their complexity and higher cost, these sensors are designed to handle various environmental factors, though they can be susceptible to issues like static electricity.
Output Signal
Level switches can transmit output signals using either serial or parallel communication methods, depending on their design and functionality. Serial output involves sending data in a sequential stream from a level switch to a computer or peripheral device, with clear start and end points for the transmission.
Serial output communication can be asynchronous, where the data stream is marked by start and stop signals to define its boundaries. Alternatively, synchronous serial communication uses timing to synchronize the data transfer, reducing the need for additional bits. Serial communication is advantageous for long-distance transmission and simpler wiring setups.
In contrast, parallel communication transmits data simultaneously across multiple wires, allowing the entire dataset to be received at once. This method enables rapid and reliable data transfer, though it requires that all bits arrive simultaneously, which can lead to longer processing times due to the bulk of data being handled at once.
Interface
Level switches can come with different types of displays, each offering varying levels of precision and accuracy. The three most prevalent display types used in industrial settings are analog, digital, and video displays. Typically, computers are employed to manage and interpret the data provided by these displays.
Some level switches feature integrated unit displays, allowing users to adjust settings directly on the switch itself.
- Analog � As with all analog displays, there is a dial, button, or needle used to set the parameters of the switch.
- Digital � Digital displays are the most user friendly and have numerical readings that can be used to set the levels for the level switch. The display is normally lit and has a method for entering or reading data.
- Computer � More and more systems are connecting level switches to computers to receive the output data, whether it is serial or parallel. A computer is capable of arranging the data and providing a video display.
Chapter Five � What are the advantages of level switches?
Level switches offer a cost-effective solution for overseeing and managing the levels of bulk substances and liquids. Effective control of raw materials is crucial for minimizing waste and enhancing efficiency in manufacturing processes. In today’s competitive environment, even minor discrepancies can significantly impact production and product development.
The seemingly modest size of level switches might lead some to underestimate their importance. However, investing in these devices can greatly improve the efficient use of raw materials.
Level Switch Advantages
Preventing Waste
Managing the storage of bulk and liquid materials helps to prevent waste from spills and overflows. A well-configured level switch can trigger valves or pumps to manage overflow and prevent losses. Continuous level measurement switches maintain the right amount of raw materials consistently, while point level sensors can alert users if a container is either too full or too empty.
Money Savings
In the modern business world, cost-saving measures are crucial for boosting profits. Protecting, monitoring, and controlling inventory and raw materials is essential to minimize losses. Despite advances in inventory management software, financial officers are aware that discrepancies often occur during official inventory counts.
The frequent occurrence of inventory losses requires ongoing asset monitoring. Tracking bulk materials and fluids can be particularly challenging due to their nature. Level switch manufacturers understand these challenges and offer a range of solutions designed to provide accurate data on raw material volumes and quantities.
Automatic Advantages
Level switches, unlike traditional methods like floats or yardsticks, automatically deliver precise data to a computer without the need for manual intervention. If not connected to a controller, the data can still be accessed easily via digital or analog displays.
Historically, monitoring large storage containers required frequent manual checks, often leading to inaccurate or incomplete readings. Modern automatic reporting level switches have replaced these labor-intensive methods, streamlining the process.
Reliability Advantage
Modern level switches are engineered to deliver reliable performance and accurate data. The durable casings and materials used ensure long-lasting precision. With minimal moving parts, level switches require little maintenance and are unlikely to fail. Routine calibrations might be necessary to maintain accuracy, but the likelihood of malfunction is very low.
Switch Installation
Installing level switches, whether for continuous measurement or point detection, is straightforward and can be completed in one to two hours depending on the type. Their easy installation facilitates repositioning when storage configurations change.
Compact Benefit
Level switches are compact and portable, making them suitable for a variety of container sizes and shapes. Their small size allows them to fit easily into containers without obstructing the measurement process, ensuring accurate data collection.
Switch Sensitivity
Investing in level switches is justified by their high sensitivity and precision in data collection. Accurate and up-to-date information is essential for effective decision-making. Ensuring the correct quantity of material is transferred during production is critical, making level switches vital for inventory management and production efficiency.
Level Switch Versatility
There is a level switch available for virtually any type of material, including viscous slurries, tar, petroleum, grain, flour, and molten metals. This versatility allows level switches to meet a wide range of monitoring needs, proving their importance in production and processing operations.
Chapter Six � How to Choose the Right Level Switch?
A level switch is a device, either mechanical or electrical, designed to monitor and assess the levels within containers such as bins, silos, storage tanks, and other receptacles. These instruments help in maintaining materials within designated levels, ensuring they do not drop below or exceed predetermined points.
When selecting the appropriate level switch for your needs, several factors must be taken into account. These include electrical specifications, wire types, the positioning of the switch, the nature of the material being measured, and the method of mounting the switch.
Choosing a Level Switch
Level Switch Material
Level switches are made from every type of material conceivable. When determining what level switch to buy, it is important that the level switch be compatible with the material it will be monitoring. Manufacturers make level switches from brass, stainless steel, and various forms of plastic. All of these materials can be used with wet materials that are non corrosive.
The chemical properties of the measured media can affect the performance of a level switch. This factor also plays a role in determining whether the switch should be an immersion type, such as a displacer or float level switch.
Electrical Requirements
For a level switch to work properly, its electrical connection must match its power supply. Insufficient power supply or over supply can lead to poor performance of the level switch or non-activation.
Switch Mounting
Although it may appear straightforward, the way a level switch is mounted significantly affects its performance and functionality. Essentially, level switches can be mounted either horizontally or vertically, which represents the basic mounting options.
Mounting configurations also involve several considerations, including the size of the mounting hole, the location on the container (such as the side, top, or bottom), whether the attachment is threaded or unthreaded, and whether the switch is to be hung or wall-mounted. Each of these factors needs to be determined before purchasing a level switch.
Measurement of a Switch
Determining the reason for purchasing a level switch involves deciding in advance what type of data is needed and the method of measurement. All level switches are designed to provide accurate readings. The specific types of readings are influenced by how the level switch will be utilized. Typically, applications require two level switches: one to monitor the empty level and another to detect overfill.
It is essential to define the lowest acceptable level and how close the contents can come to the top of the container. These considerations are often determined by the container's dimensions and capacity.
Material Pressure
Materials exert pressure due to their weight. When selecting a level switch, it's important to assess whether the materials being measured will apply pressure to the switch. In such cases, level switches made from materials capable of handling high pressure are available.
Temperature Withstanding
Level switches vary in their ability to withstand temperature extremes. The materials used and the type of wiring will dictate how much heat the switch can tolerate. While many level switches can handle a range of applications, only those specifically designed for high temperatures can endure conditions of 1000°C or above.
Switch Output
Different level switches provide various output types, such as relay, analog, or digital signals. The output type must be compatible with the controller receiving the data. Additionally, the choice of output may involve considering time delays, affecting whether to use parallel or serial output.
Container Size
Level switches are compact and portable, which allows for easy handling. Although this is a common feature, some types of switches fit more easily into certain container sizes than others. This aspect, though seemingly straightforward, is often overlooked. The initial step in selecting a level switch is to measure the container size and determine the number of switches needed.
Some applications require progressive readings as the level of contents rises. This can be achieved using continuous level measurement switches or accurately positioned point level detectors.
Conclusion
- A level switch is an electrical or mechanical method for measuring the level of a liquid, powder, or granule material.
- Level switches are an essential part of production operations and are used in harsh conditions with extremes in temperature, pressure, and vibrations.
- There is a type of level switch to fit any type of product or application. They are used as a measurement device, a monitoring control, or as a warning alarm, such as when to turn a mechanism on or off.
- A level switch is designed to serve a single purpose, which is to notify or alert controllers when there is the detection of a problem with a product's level or presence. It signals the system when the measured level is outside the programmed parameters.
- Level switches are an economical method for monitoring, controlling, and regulating the levels of bulk materials and fluids or liquids.
