What kind of oil filling pressure table not white?

Oil filled pressure gauge, is the pressure gauge panel and the table was filled with silicone oil or glycerin, have the effect of cushion. In addition to the oil filled in the table, but also internal machine parts lubrication effect, extend the service life of the instrument at the same time. It is also called seismic pressure gauge. But sometimes we will encounter such a situation, that is oil filled pressure gauge with a period of time, in the table of oil will appear white. So what oil filling the pressure inside not white? As we all know, into the oil pressure gauge generally are silicone oil and glycerin. Under the condition of normal, glycerol and silicone oil will not pale. After testing, we found that the cause of silicone oil or glycerin white case has the following 3 kinds: 1. Manufacturers use glycerin is too cheap, impurity is in the oil; 2. The oil filled pressure gauge (inner core The spring tube and copper head) Cleaning process does not reach the designated position, after the welding joint of pressure gauge copper pipe and copper base after high temperature after heating stalwart, produce a large number of oxide and the residual flux on the surface, such as not to clean, oil filled pressure gauge will be white in a short time after. 3. Oil filled pressure gauge using occasions of high temperature influence, undermining the oil internal composition, causing the oil change physical properties, and metamorphic pale. Can see from this, must first filling the pressure inside the oil is not white, we also want to do the following three points: 1. Ask formal manufacturers to buy silicone oil and glycerin; 2. After completion of welding, to do a good job of cleaning; Choose according to use environment is suitable for the oil filled pressure gauge specifications.