What is Explosion-Proof Electric Contact Pressure Gauge?

Explosion-Proof Electric Contact Pressure Gauge                                        
    In environments where there are explosive gases or dusts (such as in the petroleum, chemical, and coal mining industries), the explosion-proof performance of pressure monitoring equipment directly affects production safety.The explosion-proof electrical contact pressure gauge, as a key instrument with both pressure measurement and signal control functions, requires particularly careful selection of its model, structural design, and material selection.Today, we will introduce to you in detail the core information of this "Explosion-proof Guardian", helping you make precise selections for industrial scenarios.    

                                                   
                                                                
1, Model Interpretation: Understanding Core Parameters from the Code 
        ·The model of a flameproof electrical contact pressure gauge usually includes key information such as the explosion-proof rating, structural form, accuracy grade, and measurement range.Take the commonly used "YXB-100" as an example: 

        Y:Pressure Guage

        X:Electric Contact   

        B:Explosion-proof Type  

        100:Dial Diameter  

         ·Key factors in selection:The explosion-proof rating must match the usage environment (for example, IIB class is suitable for propane, ethylene, etc., while IIC class is suitable for more hazardous gases such as hydrogen, acetylene, etc.), and the temperature group (T4 indicates that the maximum surface temperature of the instrument is ≤ 135℃) must meet the environmental temperature requirements.                                                        
                                                                
   2, Structural Disassembly: Three Core Components Ensure Explosion Protection and Functionality                                                            
        The structure of the flameproof electrical contact pressure gauge is centered around two core designs: "flameproof explosion-proof" and "electrical signal control". It is mainly divided into three parts:  

 ·Explosion-proof Case:The "safety protection shell" of the instrument adopts a sealed design. Even if sparks are generated inside due to a fault, they can be blocked by the shell and will not ignite the explosive mixture outside. At the same time, the shell is equipped with a pressure relief structure to prevent rupture caused by excessive internal pressure.  

·Measurement mechanism: The core component is a spring tube (such as copper alloy or stainless steel spring tube). When the measured medium enters the spring tube, the spring tube deforms due to the pressure and undergoes deformation. This deformation is transmitted through connecting rods and gear transmission mechanisms to rotate the pointer, thereby achieving pressure indication.    

·Electrical contact device: It consists of three electrical contacts (usually silver alloy contacts with good conductivity and high wear resistance), and the pointer is equipped with a movable contact that can be adjusted.When the pressure reaches the set value, the moving contact makes contact with the corresponding stationary contact, and an output switch signal (such as an alarm or start/stop of the pump valve) is generated to achieve automatic pressure control.     

3, Material Selection: Different components are suitable for different working conditions.                                                            
        The material determines the corrosion resistance, high-temperature resistance and service life of the instrument. It is necessary to select the material based on the measured medium (such as corrosive liquids, high-temperature gases) and environmental conditions：        

·Shell material:                                                        
         Cast iron: Low cost, suitable for non-corrosive and dry general explosion-proof environments;                                                        
         Stainless steel (304/316) : Resistant to acids and alkalis, suitable for environments with strong corrosiveness such as chemical engineering and Marine applications.

·Material of the measuring element (spring tube):                                                        
        Copper alloy (such as tin bronze): Suitable for measuring non-corrosive gases and liquids (such as air and water), with a temperature limit of ≤ 100℃. 

Stainless steel (304/316L): Exhibits superior corrosion resistance and heat resistance, making it suitable for measuring corrosive media (such as hydrochloric acid, sulfuric acid) or high-temperature media (temperature ≤ 200℃). 

·Electro-pneumatic contact material:                                                        
         Silver alloys (such as silver-cadmium alloy, silver-nickel alloy); excellent conductivity, low contact wear, long applicable lifespan, and capable of frequent signal on-off operations. 

·Sealing material:                                                        
         Nitrile rubber: Resistant to oil and common solvents, suitable for oil-based media.                                                        
         Fluorine rubber: Resistant to strong corrosion and high temperature (≤ 200℃), suitable for applications involving strong corrosive substances or high-temperature conditions.    

Summary:                                                        
        The selection of explosion-proof electrical contact pressure gauges requires "tailoring to the specific situation": First, determine the explosion-proof level and temperature group based on the environment. Then, select the measuring element and the material of the housing according to the measured medium. Finally, lock in the measuring element and the material of the housing through the model parameters. Finally, determine the precise specifications through the model parameters. Mastering the core logic of its model, structure, and material is essential to achieve safe and stable pressure monitoring and control in hazardous industrial environments.

If you have any specific questions regarding the selection based on specific working conditions, please feel free to leave a message in the backend. We will provide you with targeted suggestions!