Efficient and uniform enforcement of international environmental regulations for ships is a precondition for achieving the intended impact of the regulations in practice and for ensuring fair competition.

From 1 January 2015, new and stricter requirements for ships’ sulphur emissions take effect in the ECA areas.
The regulations stipulate that, in the future, ships must use fuels with a low sulphur content or clean the smoke of sulphur. Since both low sulphur fuels and cleaning technologies are significantly more expensive than conventional fuels, there will be a not inconsiderable economic incentive to not comply with the regulations. Consequently, enhanced enforcement of the regulations is of considerable importance to the port authorities around the world.


The 220M Series 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.

Port Authorities and Governing Bodies state that a ship cannot emit smoke of >20% opacity for more than 3 minutes when in port. The IMO set similar limits for on-board incinerators. The 220 Series Opacity Monitor has been used successfully to measure smoke emissions from diesel engines, incinerators and boilers on board ship ensuring that environmental concerns are met.


Lloyds Type Approved smoke opacity monitor designed specifically for the marine industry
In situ measurement directly in exhaust gas flow
Measurement reading as % Opacity
Modulated green LED source for long lifetime stability and immunity to ambient light
‘Intelligent’ sensor so no requriement for a local control unit
Choice of interface options enabling easy integration into ship’s control system
Optional Operator Interface with panel mount configuration


Simple to install, commission and operate with an excellent reliability record
Rugged design with no moving parts so low maintenance
Latched head design to enable ease of access to optics for preventative maintenance
Free utility software for PC based set-up, control and data logging


Measuring Principle: Light Transmission
Operating Wave length: 510–540nm (greenLED)
Measurement Reading; Opacity (%)
Measuring Range: 0–100% Opacity (userconfigurable)
Path Length (duct diameter): 0.5–20m (flange-to-flangeseparation)
Accuracy: +/-2%
Resolution: 0.1% (display resolution)
Damping: 1–60s (user selectable)
Drift with Temperature: +/- 2% (over 20°C)

Power & Air Requirements
Voltage +24Vdc (optional 90-260Vac PSU available)
Nominal Current Consumption 400mA
Power Up Current Consumption 400mA
Purge Air Supply Volume 50–200L/min(to each air purge body)
Purge Air Quality Suitably filtered, oil free and dry

Interface Options
Serial Comms Mod Bus RTU via RS485, Internal USB (OI), External USB (RX)
Analogue Outputs 4.0–20mA (isolated and scalable)
Relay Contacts 3A @ 30Vdc (signal level and service alarms)

Ambient Operating Temperature -20–+55°C (air temperature around the equipment)
Exhaust Gas Temperature Up to +600°C (heat insulating gaskets included)
Ambient Operating Humidity 0–100%
Ingress Protection IP65 for external use
Materials 316 Stainless Steel (powder coated)
Dimensions 153x120x122mm(measuring head)
Weight 2.5kg per head

Optional Accessories
•Operator interface (OI)
•90–260Vac model available
•Mounting flange installation kit
•Laser alignment tool to assist with installation
•Air purge blower kit (110Vac/230Vac/415Vac)
•Compressed air purgekit
•Fail safe shutter kit
•Reference filters for routine calibration check of the instrument


  • Retrofits
  • Boilers
  • OEM marine systems
  • Diesel engines
  • Other industrial and combustion processes
  • Incinerators