Humidity Definitions - Part 3

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…

December 5, 2019

Humidity Definitions - Part 2

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…

November 14, 2019

Humidity Definitions - Part 1

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…

October 31, 2019

How Dewpoint is Affected by Pressure

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.…

September 19, 2019

Chilled Mirror Hygrometer Temperature Depression Explained

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.…

September 5, 2019

Aluminum Oxide

Aluminum Oxide Dewpoint Transmitter Application Note - High-Temperature Inert Gas

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…

August 22, 2019

Aluminum Oxide

Aluminum Oxide Dewpoint Transmitter Application Note - Purified Gas

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…

August 8, 2019

Aluminum Oxide

Aluminum Oxide Dewpoint Transmitter Application Note - Glove Boxes

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…

July 25, 2019


Edgetech Instruments Inc. Moisture Analyzers Assist Innovative Liquid Metal Battery Maker Ambri Inc.

Edgetech Instruments provides Ambri, a manufacturer of innovative liquid metal batteries located in Marlborough MA, with the PPM 1 Trace Moisture Analyzer from their facility in neighboring Hudson, MA. The PPM 1 sensor utilizes a proprietary P205…

July 11, 2019

Aluminum Oxide

Aluminum Oxide Dewpoint Transmitter Application Note - Instrument Air

Application: Instrument Air Application Description: Instrument air, or compressed air, is a very common utility found in most manufacturing facilities. It can be used in any number of applications from the pneumatic-conveying of material, to…
June 13, 2019

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