Division 2 portable trace moisture measurement

June 2005 Analytical Instrumentation & Environmental Monitoring

Moisture in gas streams has a way of causing trouble in manufacturing operations and in many research and quality control procedures. Since moisture affects the chemical, electrical, and physical properties of virtually everything, undetected or unchecked moisture can adversely affect product quality and reduce or halt production.

Ametek's 303B moisture analyser offers a simple solution to the problem of measuring the moisture content of gas streams. Based on Faraday's Laws of Electrolysis, the 303B absorbs and electrolyses moisture down to fractional parts per million and is linear to its 2000 parts per million by volume maximum reading. An electrolytic cell does not require calibration, and is virtually specific to water therefore it can be used to monitor nearly all gases.

The 303B is equipped with a digital moisture-indicating meter, all solid-state electronics, a rugged plug-in moisture cell, and a highly accurate, adjustable flow control system. The unit is compact, lightweight, and suitable for both portable use and permanent installation.

A 4 to 20 mA output, compatible with a 625 (maximum load, transmits moisture level to a recorder or control centre. This allows the analyser to be sited close to the sample tap to give fast and accurate measurement. The 303B is available with a choice of power sources covering AC, external DC, and internal battery operation. With an optional carrying bag and lightweight design, this flexibility makes the 303B truly portable.

A built-in bypass flowmeter increases total sample flow to reduce response time. This bypass feature is valuable when the 303B is in portable service, for example, rapidly analysing moisture in gas cylinders, where it is essential to purge valves, regulators, and tubing of atmospheric moisture prior to making measurements. The portable 303B Moisture Monitor, built for NEC Div. 2 areas, is designed to measure moisture content in gases such as air, nitrogen, argon, natural gas, and others with comparable characteristics.

For more information contact Noel Bauchop, OEN Enterprises, 011 675 4447, [email protected], www.oenenterprises.co.za

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