Pressure sensors are commonly used to measure negative pressure or vacuum. If you often work with negative pressure sensors, you may notice that most typical models have a maximum measurable range of -100kPa or -0.1MPa. However, very few manufacturers can produce sensors capable of measuring down to -300kPa or even lower. Why is that?
The answer lies in understanding two different perspectives. From a physics standpoint, the maximum vacuum pressure achievable is around -100kPa, which is why most standard negative pressure sensors are designed to measure down to that level. But what about those sensors that claim to measure -300kPa?
Actually, this kind of measurement isn't based on atmospheric pressure. Instead, it's relative to a reference point. For example, if you have a sealed container filled with gas at 300kPa and another vacuum chamber inside, using a negative pressure sensor to measure the pressure inside the vacuum chamber from the outside would show a reading of -300kPa. This value is not measured against atmospheric pressure but relative to the higher-pressure environment.
Understanding this concept is crucial when selecting a pressure sensor. It helps avoid choosing the wrong type for your application. That’s why we always ask our customers first about their working environment and the specific pressure range they need. Only by knowing these details can we ensure the right sensor is selected for the job.
Whether you're dealing with vacuum systems, industrial automation, or scientific research, getting the right pressure sensor is essential for accurate and reliable measurements. Always take the time to understand the reference points and environmental conditions before making a decision.
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