Beta gauge particulate monitor

March 2010 Analytical Instrumentation & Environmental Monitoring

Verewa’s Model F-904 Extractive Beta Gauge Particulate Monitor is designed to provide accurate particulate measurements in a wide variety of process and emission monitoring applications.

The unit incorporates a three-step procedure to ensure accurate and reproducible particulate measurements. At the start of each measurement cycle, the F-904 measures the amount of radiation absorbed by an unloaded filter tape. This is in essence an automatic zero correction. Once this ‘zero’ reading is taken, a sample is drawn through the filter tape at a controlled flow rate and any particulates in the gas stream deposited on the filter tape. After a pre-selected sample collection period, the F-904 again measures the amount of radiation absorbed by the loaded filter tape. The difference between the original zero reading and the final reading is directly proportional to the additional mass (ie, dust particulates) collected on the tape.

The instrument consists of five main modules: sample probe, sample collection/measurement assembly, sample gas cooler, pump/flow controller and on-board computer. All functions are controlled by the powerful PLC, which also calculates the particulate concentration value from the gas volume and zero/final radiation absorption differential. Components are housed in a sturdy cabinet and are easily accessible for periodic inspection and maintenance.

Typical applications include coal and oil-fired power plants, waste incinerators, dust monitoring, heavy metal analysis and small diameter stack monitoring.

For more information contact Jan Pretorius, OEN Enterprises, +27 (0)11 675 4447, [email protected], www.oenenterprises.co.za

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