How to select the type of electrical contact pressure guages?

In industrial automation control systems, electrical contact pressure gauges, as an important pressure measurement and control instrument, are widely used in industries such as petroleum, chemical engineering, power, and metallurgy. Understanding the different models, structural features and material selection of electrical contact pressure gauges is crucial for correct selection and use. This article will provide you with a comprehensive analysis of these key elements of the electrical contact pressure gauge.  

1，Common models of electrical contact pressure gauges                        
Model composition：  

 Y: represents a pressure gauge

 X: Indicates electrical contact point (or use "D" to represent) .

C: Magnetic-assisted type (for some models) .

Number: Indicates the diameter of the dial, such as 60, 100, 150, etc.  

Suffix letters: Denote specific functions or materials, such as B indicating stainless steel, F indicating anti-corrosion, etc.

Common models:                    
YXC60: Ordinary electrical contact pressure gauge, with a dial diameter of 60mm .                    
YXC100B: Stainless steel electric contact pressure gauge, dial diameter 100mm.      

2,The structural features of the electrical contact pressure gauge 

Model composition：

The electrical contact pressure gauge mainly consists of three major parts: the measurement system, the indicating device and the electrical contact device.  

Measurement system: Comprising components such as the bourdon tube and connectors, it is responsible for sensing changes in pressure.

Electric Contact Set:     
    Ordinary type: Achieves on-off function through mechanical contacts.                     
    Magnetic-assisted type: Utilizes magnetic force to enhance the contact pressure between contacts, thereby improving reliability.                     
    Electronic type: Utilizes non-contact electronic switches, resulting in longer lifespan.                    

Special structural type:                     
    ·Axial type: The pressure gauge connector is located on the back, aligned with the dial.                    
    ·Radial type: The pressure gauge connector is located at the bottom, perpendicular to the dial.                     
    · Diaphragm type: Suitable for measuring corrosive and high-viscosity media.  

3,Selection of material for electric contact pressure gauges                        
Different working environments require the use of different materials for electric contact pressure gauges:                    
Case material:                    
Carbon steel: Cost-effective, suitable for general environments.                    
Stainless steel (304/316): Corrosion-resistant, suitable for industries such as chemical and food processing.                    
Aluminum alloy: Lightweight, suitable for mobile devices.                    

Internal component material:

·Spring tube: Commonly made of copper, stainless steel, etc.  

·Contact material: copper alloy, gold alloy, etc. These materials affect the conductivity and lifespan.                    
                        
Sealing material:    

·Nitrile rubber: General-purpose type.

·Fluorine rubber: Resistant to high temperatures and corrosion.

·Polytetrafluoroethylene: Extremely high corrosion resistance.      

4,Selection model suggestions                        
Based on the characteristics of the medium:                     
Corrosive medium: Use stainless steel housing with PTFE diaphragm .                    
High-temperature resistant material: Select materials and seals that are resistant to high temperatures.                    

Choose according to environmental conditions:                     
·Damp environment: Select models with protection rating of IP65 or higher.                    
·Explosive and flammable environment: Select explosion-proof type electrical contact pressure gauges.                    

Select according to the control requirements:                    
·High precision control: Select the accuracy level of 0.5 grade or 1.0 grade.                     
·For frequent operation scenarios: Choose magnetic-assisted type or electronic type.    

5,care and maintenance

·Regularly check the status of the contacts to prevent oxidation or adhesion.                    
·Keep the shell clean to prevent dust and oil from entering.                     
·Regularly test the accuracy of the pressure indication values.                     
·Replace the damaged seals to ensure the protective performance. 

Summary                        
The correct selection and use of electric contact pressure gauges directly affect the reliability and safety of the control system. By understanding the characteristics of different models, structures and materials, users can choose the appropriate products based on the actual working conditions. It is recommended to consult professional technicians in detail before purchasing to ensure that it meets your specific application requirements.