Measuring differential pressure in cleanrooms can be done in two ways: on the one hand, by directly measuring the actual differential pressure between two spaces; on the other hand, by calculating the differential pressure based on atmospheric pressure gauges between different spaces. Why is direct measurement better than a calculated value?

1. Direct representation of pressure difference:

A true differential pressure gauge measures the actual pressure difference between two spaces, for example, between the cleanroom and an adjacent room. This measurement is independent of external variables, such as atmospheric pressure fluctuations, temperature changes, or other environmental factors. This means the measurement accurately reflects the relevant pressure differences for airflow and contamination control within the cleanroom.

2. Better accuracy:

Calculating differential pressures based on atmospheric pressure gauges can be less accurate because it relies on assumptions or averages. Atmospheric pressure can vary depending on location and weather conditions, which can affect the calculated value of the pressure difference. With a direct measurement, these variations are automatically compensated for.

3. Control of airflow and contamination:

In cleanrooms, it is crucial to control airflow and pressure differences accurately, because even small variations in pressure between different spaces can influence airflow. A correct measurement ensures that air always flows from clean areas to less clean areas, which is essential for maintaining proper contamination control.

4. Less dependent on external influences:

When calculating differential pressures, a specific atmospheric pressure is often assumed, but this can fluctuate due to weather conditions, seasonal changes, or altitude differences. This can lead to inaccurate estimates of the actual differential pressure in the cleanroom. A direct measurement is independent of these influences, providing a more reliable result.

5. Faster detection of anomalies:

A true differential pressure measurement provides real-time data, allowing for the quick detection of any deviations. This is important for maintaining the required standards in a cleanroom. If there is a problem with airflow or pressure relationships, it can be quickly identified and corrected.

Conclusion:

A true differential pressure measurement is therefore better because it accurately reflects the actual situation in the cleanroom without being influenced by external factors. This improves the reliability of pressure control, which is essential for safety, air quality, and maintaining the strict requirements of a cleanroom.