1. Oil flow observation method:
Take two cups, one of which need to be checked out of the air compressor oil, empty on the desktop, the other will be filled with lubricating oil measuring cup for leave desktop 30 to 40 cm tall and lean, let it flow slowly to the empty cup, to observe the flow situation, when good quality lubricant oil flow should be long and thin, uniform, continuous, if appear oil flow fast and slow, sometimes with large flow, then oil has deteriorated.
2. Hand twisting:
The air compressor oil twist between the thumb and the index finger repeatedly grinding, if the hand feels lubricity, grinding crumbs, no friction, if feel between the fingers of sand and other large friction, it shows that the compressor oil impurities, can not be used again, should be replaced with a new compressor oil.
3. Illumination method:
On a clear day, lift the air compressor oil with a screwdriver at a 45-degree Angle to the horizontal surface.Contrast with the sun, observe the situation of oil droplets, in the light, can clearly see that the oil is good, can continue to function, if the dust too much, should be replaced empty.
3. Oil drop trace method:
Take a clean white filter paper and drop a few drops of oil on the filter paper. If there is black powder on the surface after the pressure oil leakage and touch it with your hand, it indicates that there are many impurities in the lubricating oil.
Summary: through the above four methods can be simple and fast to judge whether the air compressor oil deterioration, whether it can continue to use.Hope to be of help to you.