Vacuum degree in vacuum drying oven
The vacuum drying oven is specially designed for drying heat-sensitive, easily decomposed and easily oxidized substances. Inert gas can be filled into the vacuum drying oven, especially some items with complex composition can be dried quickly. It is widely used in many fields, mainly for powder drying, baking, sterilization, etc.
Vacuum degree refers to the degree of gas dilution in the vacuum drying oven under vacuum, which is usually expressed by "high vacuum" and "low vacuum". If the pressure in the tested equipment is stronger than atmospheric pressure, a vacuum gauge is required for pressure measurement. The value read from the vacuum gauge is called vacuum degree.
The value of vacuum degree refers to the value when the actual value of the system pressure is lower than the atmospheric pressure, that is: vacuum degree = atmospheric pressure-absolute pressure. Supplementary comprehensive explanation: "vacuum degree" means the degree of vacuum. The so-called "vacuum" refers to a gas state with a pressure lower than 101325 Pascals in a given space.
The "vacuum degree" commonly used in the international vacuum industry is also the most scientifically marked with absolute pressure. It refers to "ultimate vacuum, absolute vacuum degree, absolute pressure", but "relative vacuum degree" is also widely used because of its simple measurement method and common measuring instrument which is easy to buy at a low price.
In theory, the two can be converted to each other. The conversion method is as follows: relative vacuum degree = absolute vacuum degree (absolute pressure)-atmospheric pressure at the measurement location.
The vacuum drying oven requires different drying time for different drying objects and different humidity levels. If the drying time is longer and the vacuum degree drops, it needs to pump again to restore the vacuum degree. Turn on the vacuum pump motor switch first, and then turn on the vacuum valve.
When the vacuum drying oven is vacuumed, observe the negative pressure indication status of the panel vacuum gauge, and close the vacuum system in time when the required vacuum pressure value is reached. Turn off the panel vacuum valve switch first, and then turn off the vacuum pump power supply, otherwise the vacuum pump oil may flow back into the cabinet working room, affecting the normal use of the instrument.