Online photometry measurement

September 2002 Analytical Instrumentation & Environmental Monitoring

The Model 4000 Photometric Analyser from Ametek Western Research is designed for reliable, accurate, continuous online photometry measurement. The analyser provides high sensitivity and repeatability and has no moving parts, resulting in a simplified sampling process. It is ideally suited for chlorine purity, fluorination and phos-genation processes, impurity monitoring and pulp and paper bleaching applications.

Using ultraviolet or visible light to measure a wide range of gas and liquid properties, the analyser's principle of analysis is the absorption of UV/visible energy within a sample cell. The analyser detects how much light is attenuated when passing through a fixed volume of sample. The amount of attenuation is directly proportional to the desired measurement. Since the analysis technique is to simply shine the light through the sample cell, sample conditioning is usually limited to keeping the sample in either the gas or liquid phase.

Sample cells and their sealing materials can be configured to handle gases and liquids up to 105 kPag (2200 psig) or 538°C. Sample wetted materials can be selected to handle virtually any chemical. Corrosion-resistant plastics and metals as well as simple stainless steel are available.

The Model 4000 utilises a 'split-beam' design that reduces or eliminates measurement errors due to bubbles, particulate and lamp intensity fluctuations. The split beam allows continuous monitoring of both the measuring wavelength of light as well as a reference wavelength. Because the reference is not affected by the sample, it can be used to detect the presence of bubbles, particulate and lamp intensity fluctuations. A built-in optical filter allows on-demand verification of analyser span readings, thereby eliminating the requirement for costly laboratory verification or calibration gases.

The Model 4000 can be configured for any location, from a general-purpose installation to a NEC class 1, division 1 installation or a Cenelec Zone 1 system. The Model 4000 meets CE, CSA and UL requirements signifying its electrical safety and EMI/RFI code compliance.

For more information contact Mike Andrews, OEN Enterprises, 011 792 2859, [email protected], www.oenenterprises.co.za

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