Which instrument is commonly used to measure a deep vacuum?

The micron gauge is specifically designed to measure very low pressures, typically in the range of microns, which is essential for assessing deep vacuum levels in refrigeration and HVAC systems. When creating a vacuum, it is critical to reach a specific low pressure to ensure that all moisture and contaminants are removed from the system before charging it with refrigerant. This low-pressure measurement, often in the range of 500 microns or lower, indicates that an effective vacuum has been achieved.

Other instruments, such as manifold gauges and pressure gauges, are tailored for different pressure measurements and are not capable of accurately measuring deep vacuum levels. Manifold gauges are typically used for monitoring high and low pressures in refrigeration systems but are not suited for the sub-atmospheric pressure measurements required for deep vacuums. Mild gauges, while not commonly referenced, do not provide the low measurement range necessary for deep vacuum applications. In contrast, a micron gauge allows technicians to verify that the vacuum is adequate to ensure the system operates efficiently and reliably.