What factors affect the pressure resistance of vibration sensors?

Three key areas comprise the primary elements influencing the pressure resistance of vibration sensors: design process, material selection, and packaging structure. The sensor's capacity to tolerate high pressure is directly determined by these:

1. Isolation Design and Packaging Structure

Diaphragm Thickness: A thicker diaphragm offers greater pressure resistance for direct-pressure sensors in contact with the molten metal, but too much thickness lowers sensitivity. Sensor failure and leakage are directly caused by an inadequately thick diaphragm, which is vulnerable to distortion and cracking under high pressure.

Encapsulation Housing Strength: Compared to sensors with PVC or plastic packing, those with integrated stainless steel packaging exhibit noticeably superior pressure resistance. Under high pressure, seams at the joints become weak areas that are prone to cracking and leaking.

Wiring Sealing Structure: Under high pressure, molten metal can readily seep through the wiring gaps due to inadequate sealing design at the wiring points, causing damage to the sensing element and pressure failure.

2. Selection of Materials

Diaphragm Material: Even under prolonged alternating high pressure, sensors made of high-strength alloy materials, such as 17-4PH stainless steel and Hastelloy, are less likely to fatigue crack and have far superior pressure and fatigue resistance than regular carbon steel. Sealing Materials: Metal gaskets and high-pressure, high-temperature resistant polytetrafluoroethylene (PTFE) are used for sealing because they provide greater stability and pressure resistance than regular rubber seals and are less likely to deform and fail at high temperatures and pressures.

3. Production Procedure

Welding Procedure: Compared to bolted connections, integrated welded encapsulation offers superior pressure resistance. They are vulnerable to cracking under high pressure because welding flaws immediately produce weak areas in pressure resistance.

Stress Relief: The sensor will have residual stress if stress relief is not carried out during manufacture. Pressure resistance will continuously decrease as a result of progressive deformation brought on by prolonged exposure to high pressure.

Calibration Procedure: The nominal and actual pressure resistance of sensors that have not undergone pressure resistance calibration testing at the factory differ significantly, which can easily lead to circumstances in which the nominal pressure resistance is satisfied but the actual resistance cannot be withstood.