Monitoring of flue gas filters
July 2014
Analytical Instrumentation & Environmental Monitoring
The Durag D-FW 230/D-FW 231 filter monitors may be used for continuous monitoring of filter installations in flue gas ducts, duct work for dust extraction and similar applications. 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 emission sources or filter, appropriate action may be taken in the event of a malfunction to prevent or limit damage.
With its compact and rugged design, the filter monitor provides a good price/performance ratio with minimal maintenance required. It is ideal for use in power stations, bag filter plants of all types, dust extraction plants in the production industry and waste incineration plants. The Durag D-FW 230/D-FW 231 consists of a measuring probe and filter monitor. The monitor has a simple construction and is easy to install with no need for a PC or laptop. Meeting IP65 requirements, the filter monitors have a flue gas pressure from -500 to 500 hPa and a flue gas temperature above dew point up to 200°C with an option of up to 500°C.
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.
The D-FW 230 is designed for single applications. The control unit monitors the measured values digitally and uses a relay to signal any exceeded limit value. The limit value threshold may be set anywhere from 4-20 mA. Zero testing may be carried out directly from the control unit with the flip of a switch.
The probe is suitable for use in a multi-filter plant, where supervision of all filters is done by means of a central processing unit. The length of the flow path prior to reaching the filter monitor must total at least 5x the diameter of the channel. To keep moisture away from the sensor isolator, the sensor should be mounted horizontally or with a downward slope.
For more information contact Mike Andrews, OEN Enterprises, +27 (0)11 675 4447, [email protected], www.oenenterprises.co.za
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