Seismic pressure gauges are widely used in applications involving high pulse pressure and vibration loads. The filling fluid can suppress the vibration that occurs and remove the load on the mechanical components of the pressure gauge, so this pressure measuring instrument is often referred to as a shock resistant pressure gauge.
The case of the shock resistant pressure gauge is not filled with liquid because at a certain humidity and ambient temperature, the filling medium will absorb additional moisture and expand accordingly. To preserve sufficient expansion space and prevent leakage of the case, by default, only 80% -90% of the liquid is filled inside the case.
Glycerol water mixture or silicone oil is the most commonly used filling fluid for pressure gauges, which can be used in various operating environments. Glycerol water mixture has a wide range of applications, suitable for different working conditions and environmental temperatures, especially in the low-pressure range. Due to the low density of the liquid filled in the table, the corresponding resistance on the pressure measuring element is relatively small. When the shock resistant pressure gauge is exposed to extremely high (>+60 ° C) or extremely low (<-20 ° C) temperature environments, the main filling liquid used is silicone oil.
Filling fluid can suppress pressure peaks, shocks, and vibrations, and protect the mechanical components of pressure gauges. Therefore, material fatigue and failure can be reduced. Another advantage is to ensure the readability of the current pressure. Filling liquid can limit pointer movement, even under severe vibration load conditions. Without liquid damping, the pointer will not limit the actual applied pressure, but will move back and forth according to the frequency of the current vibration in the application. When resonance occurs, there may even be a deflection angle exceeding 180 °.
That's all for the introduction about shock resistant pressure gauges above. I hope it can be helpful for your understanding.
