SM-202

Smoke opacity monitor for monitoring marine emissions

With Port Authorities around the world increasingly regulating emissions from ships, the SM-202M Smoke Opacity Monitor is an optical instrument specifically designed to measure the visible opacity of smoke emissions within the marine industry.

Features

Gas flow measurement

In situ measurement directly in exhaust gas flow

Opacity's mesurement

Measurement reading as % opacity, smoke density as mg/m³ or Ringelmann

Modulated red LED source

Modulated red LED source for long lifetime stability and immunity to ambient light

Rugged construction

Rugged 316 stainless steel construction

‘Intelligent’ sensor

‘Intelligent’ sensor so no requriement for a local control unit

Operator interface

Panel mounting Operator Interface enabling local monitoring and control of the instrument

Interface options

Choice of interface options enabling easy integration into ship’s control system

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Resources

SM-202
Brochure

SM-202M

The SM-202M uses the single pass light 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 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.

Optional accessories

Mounting flange installation kit
Laser alignment tool to assist with installation
Air purge blower kit (110 Vac / 230 Vac / 415 Vac)
Compressed air purge kit
Reference filters for routine calibration check of the instrument

Benefits

Excellent reliability record with more than 2000 instruments installed on ships worldwide
Simple to install, commission and operate
Easy to set-up via local Operator Interface
Rugged design with no moving parts so low maintenance
Latched head and lid design to enable ease of access for installation and maintenance

Applications

Discover Acoem’s case studies

Our case studies

Single pass optical monitor for measuring the visible opacity of marine smoke emissions

In 2020, the International Maritime Organisation set new global standards to lower ship emissions. Shipping companies and port authorities around the world are legally obligated to enforce and comply with these regulations.

This optical instrument was specifically designed to measure the visible opacity of smoke emissions within the marine industry and more than 2000 have already been installed on ships worldwide.

Based on a 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 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 a percentage of opacity. The higher the level of smoke present, the more light lost and therefore the greater the opacity. A reading of particulate density is also available measured in mg/m³.

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