The SM-202M uses the standard single pass transmission measurement technique, with Transmitter/Receiver arrangement. A light beam emitted from the Transmitter passes across the stack to a Receiver, which measures the intensity of the received light. Increased particulate or smoke density in the stack gas attenuates the transmitted light and causes the intensity of the received light to fall. This reduction in intensity is measured and presented as % opacity. The higher the level of smoke present, the more light lost and therefore, the greater the opacity.

The SM-202M is of rugged design and has an excellent reliability record. With no moving parts, regular maintenance simply involves cleaning the TX and RX lenses, which are easily accessible due to our latched head design. Both the TX and RX are supplied with an air purge body, which when connected to a high volume source of clean air, (a blower is recommended), will resist particle deposition on the lenses and further lengthen service intervals.

Advantage:

• In situ measurement of smoke opacity directly in exhaust gas flow
• Measurement reading as % Opacity, smoke density as mg/m3 or Ringelmann
• Modulated LED source for long lifetime and immunity to ambient light
• Rugged 316L stainless steel construction
• Panel mounting Operator Interface enabling local monitoring and control of the instrument
• Choice of interface options enabling easy integration into ship’s control system