In industrial automation systems, target flow switches are important flow monitoring devices widely used in liquid and gas flow control. Their operating principle is based on the force of the fluid on the target plate, judging whether the fluid flow reaches the set value by detecting this force. However, target flow switches performance and lifespan largely depend on the cleanliness of the medium. So, what are the medium cleanliness requirements for target flow switches? This article will delve into this issue to help you better understand how to ensure stable operation of the equipment.

The relationship between the working principle of the target flow switch and cleanliness

target flow switches The core component is the target plate. When fluid passes through the pipe, the target plate is subjected to the impact force of the fluid. By detecting the displacement or force change of the target plate, the system can determine whether the flow rate reaches the preset value. However, if the medium contains impurities or particulate matter, these substances may adhere to the target plate, affecting its sensitivity and accuracy.

In water treatment systems if the water contains mud, sand, or other solid particles, these particles may accumulate on the target plate, causing the target plate to jam or its sensitivity to decrease. In the petrochemical industry if the medium contains colloids or precipitates, these substances may form deposits on the target plate, affecting the normal operation of the equipment. Therefore, the cleanliness of the medium is directly related to target flow switches its performance and lifespan.

The impact of medium cleanliness on target flow switches

1. Decreased sensitivity
   When the medium contains impurities, these impurities may adhere to the target plate, increasing the weight or resistance of the target plate. This will lead to target flow switches a decrease in sensitivity, making it impossible to accurately detect changes in flow. For example, in cooling water systems if the water contains a large amount of suspended matter, the target plate may be wrapped by these substances, causing the equipment to fail to respond to changes in flow in time.

2. Mechanical wear
   Hard particles in the medium (such as sand or metal chips) may cause wear and tear on the target plate and other mechanical components. In the long term, this wear will lead to a decrease in equipment accuracy, or even cause malfunctions. For example, in industrial wastewater treatment if the wastewater contains a large amount of solid particles, these particles may cause serious wear and tear on the target plate, affecting the normal operation of the equipment.

3. Blockage risk
   If the medium contains viscous substances or fibrous impurities, these substances may accumulate around the target plate, causing blockage. For example, in the food processing industry if the medium contains pulp or fibers, these substances may block the target plate, affecting the normal operation of the equipment.

4. Corrosion issues
   Some media may contain corrosive substances, which may corrode the target plate and other metal components. For example, in the chemical industry if the medium contains acids or alkalis, these substances may corrode the target plate, affecting the service life of the equipment.

Medium cleanliness requirements for target flow switches

To ensure target flow switches normal operation, the medium needs to meet certain cleanliness requirements. Specific requirements vary depending on the application scenario and medium type, but usually include the following aspects:

1. Particle size and concentration of solid particles
   Solid particles in the medium should be as few as possible, and the particle size should not be too large. Generally speaking, the particle size should be less than 0.5 mm and the concentration should be controlled below 100 mg/L . For high-precision applications, stricter requirements may be needed.

2. Content of viscous substances
   The medium should avoid containing viscous substances such as grease and colloids. These substances easily accumulate on the target plate, affecting the sensitivity of the equipment. If the medium inevitably contains viscous substances, it is recommended to clean the equipment regularly or install a filter.

3. Concentration of corrosive substances
   If the medium contains corrosive substances, ensure that their concentration is within the allowable range of the equipment. For highly corrosive media, it is recommended to choose target flow switches made of corrosion-resistant materials, or take protective measures.

4. Content of fibrous impurities
   The medium should avoid containing fibrous impurities such as pulp and hair. These substances easily accumulate around the target plate, causing blockage. For media containing fibrous impurities, it is recommended to install a filter or clean the equipment regularly.

Measures to improve medium cleanliness

To meet target flow switches the medium cleanliness requirements, the following measures can be taken:

1. Install a filter
   Before the medium enters target flow switches installing a suitable filter can effectively remove solid particles and fibrous impurities. For example, in water treatment systems a sand filter or filter screen can be installed to remove suspended matter from the water.

2. Regularly clean the equipment
   For viscous substances or easily deposited media, regular cleaning is recommended target flow switches to remove impurities adhering to the target plate. For example, in the food processing industry the equipment can be regularly cleaned with a cleaning agent to remove pulp or grease.

3. Choose corrosion-resistant materials
   For corrosive media, it is recommended to choose target flow switches made of corrosion-resistant materials, such as stainless steel or special alloys. This can effectively extend the service life of the equipment.

4. Optimize system design
   When designing fluid systems, the sources of media contamination should be minimized. For example, in the petrochemical industry the precipitation and colloid in the medium can be reduced by optimizing the pipeline design.

Case study in practical application

For example, cooling water systems This system is typically used for industrial equipment cooling, and the medium is circulating water. Since the water may contain impurities such as mud and rust, these substances easily adhere to target flow switches the target plate, affecting the sensitivity and life of the equipment. To solve this problem, multi-stage filters can be installed in the system to remove solid particles from the water. At the same time, regularly clean the equipment to remove impurities adhering to the target plate. In addition, corrosion-resistant materials can also be selected target flow switches to improve the corrosion resistance of the equipment.

In the food processing industry In grease separators and filters to remove viscous substances and fibrous impurities from the medium. At the same time, regularly clean the equipment to ensure the cleanliness of the target plate.

Conclusion

target flow switches The performance and life of the equipment largely depend on the cleanliness of the medium. To ensure the normal operation of the equipment, the medium needs to meet certain cleanliness requirements, including the particle size and concentration of solid particles, the content of viscous substances, the concentration of corrosive substances, and the content of fibrous impurities. By installing filtering devices, regularly cleaning the equipment, selecting corrosion-resistant materials, and optimizing the system design, the cleanliness of the medium can be effectively improved, and the service life of target flow switches can be extended. In practical applications, appropriate measures should be taken according to the specific scenario and medium type to ensure the stable operation of the equipment.