How to Further Optimize the Pressure Resistance Performance of Vibration Sensors

Customized modifications can be produced for extreme operating situations if you want to further enhance pressure resistance performance after basic selection and installation optimization are finished. Industry-proven sophisticated optimization solutions include the following:

1. Tailored Improvements to Materials and Structures

Diaphragm Material Upgrade: Use Hastelloy C276 instead of 17-4PH stainless steel for high-temperature engineering plastic hot runners with working pressures higher than 150 MPa. This makes it more than three times more resistant to corrosion and high-pressure fatigue, and even under prolonged alternating high pressure, it is less likely to crack.

Strengthened Support Structure: To increase overall structural stability, minimize leakage from sealing surface deformation, and lessen elastic deformation of the sensor housing under high pressure, add a high-strength stainless steel support base to the back of the sensor.

Improved Sealing Structure: Swap out the single seal for a double seal made of flexible, high-temperature-resistant filler and a metal hard seal. The pressure resistance reliability is doubled because even if one seal fails, the other can still keep molten material from penetrating.

2. Improved Flow Channel Matching and Installation

Added Buffer Chamber Design: At the front end of the sensor, a little buffer cavity with a diameter of 5-8 mm is made. Before coming into contact with the diaphragm, the melt passes through this buffer chamber to lower pressure. This reduces the instantaneous impact pressure by 15% to 20% and greatly lessens the impact of a high-pressure water hammer on the diaphragm.

Angled Mounting Head: To ensure a seamless transition with the flow channel wall, a 15° angled head is used in place of the sensor head plane. This lessens local pressure variations by preventing eddy currents from developing at the sensor head.

3. Optimization of Advanced Process Maintenance

Frequent Pressure Calibration: Every six months, the sensor is sent back to the manufacturer for output and pressure calibration. To identify performance decline early, residual diaphragm deformation is examined.

Stepped Pressure Adjustment: To prevent the diaphragm from being directly impacted by sudden high pressure during cold starts, the injection pressure is progressively raised during starting and warm-up, minimizing diaphragm fatigue damage.

Special solutions for harsh working conditions: An external isolation vibration sensor can be chosen for ultrahigh temperature engineering plastics (like PEEK and PI) with working pressures higher than 200 MPa: Through the isolation rod, the sensing element is extended to the low temperature area outside the mold.

In addition to meeting the pressure resistance requirements, only the front end of the isolation rod comes into touch with the high temperature and high pressure melt, preventing the high temperature from affecting the sensing element. The dependability of temperature resistance and pressure resistance would be significantly enhanced.