Vacuum table introduction

- Aug 07, 2019-

The vacuum gauge is divided into a pressure vacuum gauge and a vacuum pressure gauge. Vacuum gauge: A gauge used to measure less than atmospheric pressure based on atmospheric pressure. Pressure vacuum gauge: A gauge that measures atmospheric pressure greater than or less than atmospheric pressure. There are two ways to express pressure: one is the absolute pressure as the reference, called the absolute pressure; the other is the pressure expressed as the atmospheric pressure, called the relative pressure. Since the pressure measured by most pressure gauges is relative pressure, the relative pressure is also called gauge pressure. When the absolute pressure is less than atmospheric pressure, the absolute pressure in the vessel can be expressed as a value less than one atmosphere. It is called "vacuum degree". Their relationship is as follows: absolute pressure = atmospheric pressure + relative pressure; vacuum degree = atmospheric pressure - absolute pressure; China's legal pressure unit is Pa (N / m2), known as Pascal, referred to as Pa. Since this unit is too small, it is often used 10^6 times unit MPa (MPa)