Triboelectric filter monitoring

October 2004 Maintenance, Test & Measurement, Calibration

Durag has introduced the D-FW 230/D-FW 231 filter monitors designed for continuous monitoring of filter installations in flue gas ducts, duct work for dust extraction and similar applications. The system offers several advantages over comparable optical devices, including low purchase, low installation and maintenance costs, as well as high performance.

The filter monitor is placed on the clean-gas side, behind a filter, and will report any defect. By using filter monitors at the most important emissions sources or filters, appropriate action may be taken in the event of a malfunction to prevent or limit damage such as shutting down the defective filter chamber.

Operating according to the principle of triboelectric measurement, the filter monitor provides continuous in situ measurement and is suitable for baghouse monitoring. A measuring probe inserted into the flue gas duct allows the sensor to record the electrical charge of the dust particles. Complete signal processing occurs in the sensor. The measured value is then transmitted as an interference resistant 4-20 mA signal and is available at the terminal strip.

Designed for single applications, the D-FW 230's control unit monitors the measured values digitally and uses a relay to signal any excess in limit value. The limit value threshold may be set between 4-20 mA, and zero testing may be carried out directly from the control unit with the flip of a switch. The D-FW 231 probe is suitable for use in a multi filter plant where supervision of all filters is done by a central processing unit. Limit values, zero testing and measurements are analysed via a PC.

If required, a portable monitoring system is available consisting of the D-FW 231 filter monitor with three probes, a strip chart recorder and additional accessories in a portable case.

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

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