Answer: The dryness of compressed air refers to the amount of water vapor mixed in the dry compressed air. The less water vapor content, the dryer the air is, and vice versa. The dryness of compressed air is measured by the "pressure dew point". The lower the "pressure dew point", the dryer the compressed air is. Sometimes there will be a small amount of liquid water droplets mixed in the compressed air discharged from the cold dryer, but this is not necessarily caused by insufficient dew point of the compressed air. The presence of liquid water droplets in the exhaust may be caused by water accumulation in the machine, poor drainage or incomplete separation, especially the failure caused by the blockage of the automatic drainer has the greatest impact. The water in the drainage of the cold dryer has a worse adverse effect on the downstream gas-using equipment than insufficient dew point, and the cause should be found out and eliminated.
