Application: Injection Molding
Application Description: Clean, hot, dry, compressed air is commonly used to purge the plastic pellets within the hopper of an injection molding machine. The air is usually dehydrated using regenerative desiccant dryers…
When the dew point temperature of a sampled gas is at a higher temperature than that of the sensing system, a condition of saturation or 100% Relative Humidity will occur within the sensing system. This causes liquid water to form within the tubing and…
Parts Per Million by Weight (PPMw)Parts per million by weight of dry gas (PPMw) is identical to PPMv except that the weight ratio changes with the molecular weight of the carrier gas.Example 1. If the frost point = -60°C and the carrier gas is hydrogen:
Relative Humidity (RH)Relative humidity (RH) is the ratio of the actual vapor pressure (Pw) in the gas mixture to the saturation vapor pressure (Pws), with respect to water, at the prevailing dry bulb temperature. Relative humidity is expressed as a…
Dalton's Law (Pm)John Dalton was first to surmise that the total pressure (Pm) exerted by a mixture of gases or vapors is the sum of the pressures of each gas if it were to occupy the same volume by itself. The pressure which each gas exerts is called…
Dewpoint is a measurement of water vapor concentration. Water vapor, or more simply “moisture”, can be a major contaminant in process gases ranging from compressed air, to purified cylinder gases, to hydrocarbon gases, to natural gas, and many others.…
There is often confusion about the dewpoint measurement range of chilled mirror hygrometers and their temperature depression range. The hygrometer dewpoint measurement range and the temperature depression are interrelated, but they are not the same. The…
Application: High-Temperature Inert GasApplication Description: Moisture measurement of a high temperature gas is often achieved through the use of aluminum oxide moisture sensors. However, care must be taken to ensure that the temperature of the gas is…
Application: Purified GasApplication Description: Purified gases are used in many industries including the manufacturing of industrial gases such as nitrogen, helium, argon, and oxygen. Other industries use or manufacture purified gases including…
Application: Glove BoxesApplication Description: Glove boxes or isolation chambers provide a controlled and pure environment for a wide variety of applications. Inert gases are used in a glove box to blanket the containment in a neutral background…
