Float Switches combined with analogue temperature output briefly explained:
A float switch with analog temperature measurement monitors both the liquid level and the temperature in tanks or containers. It combines two functions: level detection via a float switch and precise temperature measurement. Equipped with a microcontroller, the device converts the resistance signal into an analog output signal (0-10V or 4-20mA), enabling reliable monitoring and easy integration into control systems. Ideal for industrial applications.
The operating principle of a float switch based on a reed contact relies on the use of a reed switch as the switching element. A float switch consists of a buoyant body, also known as a float, which floats on the liquid surface. The buoyant body is equipped with a magnet. When the liquid level changes, the buoyant body moves accordingly, either upward or downward. When a certain level is reached, the magnet approaches the reed contact. The reed contact consists of two ferromagnetic contact blades placed within a glass capsule. These blades are separated by a small air gap. When the magnet of the buoyant body reaches the reed contact, the magnetic field attracts the ferromagnetic blades, bringing them together. This closes the contact blades, completing the electrical circuit. This closed circuit can be used to send a signal, for example, to trigger an alarm or control a motor.
Analog temperature measurement is carried out using highly accurate temperature sensors of the PT100 or PT1000 type. These sensors utilize the principle of changing the electrical resistance of a metal depending on the temperature. A PT100 sensor consists of a platinum resistance that changes its resistance value as the temperature increases. Similarly, a PT1000 sensor works, but the resistance in ohms is 1000 times larger than that of the PT100. PT sensors are capable of providing very precise and accurate resistance values directly related to the temperature of the liquid or medium in contact. These analog resistance values are then converted and displayed as temperature values via a corresponding measuring instrument or evaluation circuit. The temperature values can also be passed to control and regulation systems to monitor the temperature in the plant and to control or adjust the process if necessary.
Liquid Tanks in Production Plants
Float switches with analog temperature measurement reliably monitor the liquid level in tanks to prevent overflows or insufficient supply. The temperature sensor ensures that the liquid in the tank stays within the desired temperature range to maintain optimal operating conditions. This combination of level and temperature monitoring is ideal for the safe operation of systems in industry.
Cooling of Industrial Machines
Float switches monitor the water level in cooling tanks for machines to ensure constant cooling. The analog temperature measurement controls the cooling performance and keeps the temperature of machines or industrial processes within defined limits. This precise control optimizes performance and prevents overheating, which increases efficiency and extends the lifespan of machines. Ideal for industrial applications.
Lubrication Systems
The float switch monitors the oil level in lubrication oil tanks and prevents damage due to oil shortage. The temperature sensor regulates the oil temperature to ensure optimal lubrication. This precise monitoring ensures the efficiency of machines and extends their lifespan. Especially in industrial applications, this combination protects against overheating and failures, reducing operating costs and increasing process safety. Ideal for mechanical engineering.
Industries
Float switches with analog temperature measurement are indispensable in industry, especially in mechanical and plant engineering as well as in hydraulics. They ensure precise level and temperature control of hydraulic fluids, optimizing machine performance and longevity. They also ensure efficient processes and the maintenance of critical setpoints in industries such as heating, ventilation, air conditioning, food, and pharmaceuticals, ensuring smooth operations.
