Tanaka - Model DDM-fc -Light Scattering Method Dust Density Meter

The DDM-f C is composed with an optical detector, fiber cables, main control system, and purge air system. The detector uses light scattering method to detect the dust density of exhaust gas inside of a stack and has unique design to achieve accurate, reliable, and low maintenance operation. The microprocessor controlled main control box analyzes the data from the detector and dispatches alarm signals to the DCS to control the whole factory or to the dust control system such as bag filters and ESP (Electrostatic Precipitator) to avoid accidental air pollution or to control the system to lower the operational cost. The data can be transmitted to DCS and stored and used for data log and future analysis.

The dust contained in flue gas can cause environmental pollutions and health issues, and reducing the dust emitted from a plant/factory is global demand. In many countries the governments enforce air pollution law. Tanaka Electric Lab. dust monitor system helps to run a plant/factory more cleanly and efficiently and to establish corporative compliance and CSR (Corporate Social Responsibility).

The Tanaka Electric Lab. light scattering detector provides reliable monitoring in the harsh conditions such as highly electrically charged gas, high humidity gas, and variable velocity of gas. Its dust detection area is 3 dimensional and large; it covers large area inside of a stack and the detector has an excellent sensitivity. The light scattering method uses optical sensor and provides excellent noise resistance. Its unique detector design and the integrated purge air system makes the detector almost maintenance free. In addition, the installation of the detector is very simple as well. The electrode method detector is theoretically sensitive, but the output may be noisy and unreliable. Its detection area is very small, and the detection may not be accurate. The sensitivity of the optical penetration method detectors depends on the product. The detection area is long but narrow. The installation and maintenance are difficult.

Tanaka Electric Laboratory dust monitor systems do not only help to reduce air pollution and to establish corporative compliance and CSR, but also provide other benefits, such as:

• Improve plant’s productivity
• Reduce ESP running cost
• Improve plant equipment life time

In addition, there are more benefits:

• Reduce initial installation time and cost
• Reduce maintenance time and cost