SKIL Controls - Emission Monitor:

Skil Visible Emission Monitor for Environmental Protection Model 252
Opacity and Particulates Monitor

Throughout the world, environmental protection has become a major issue, with the need to reduce the emissions into the atmosphere. For many years smoke and fine particulate emissions have been known to be one of the main air pollutants.

With the introduction of legislation to reduce air pollution, the need to monitor smoke and dust emissions has been extended across all industrial processes emitting particulate matter. Furnaces, Incineration, Boilers and Process Plants such as steel works, cement, chemicals, glass and refining industries are now required to limit and continuously monitor their emissions.

Backed by more than 30 years' experience in the design and manufacture of flue gas monitoring instrumentation, SKIL Controls' Visible Emission Monitor has been designed to meet the legal requirements associated with smoke and dust emissions and assist in measuring the efficiency of the process. The monitor is based on the well proven cross duct measuring principle where visible light is projected across a duct or stack towards a receiver. Any particulates passing through the light beam, absorb and scatter the light, thereby reducing the intensity of the received light. Utilising the latest solid state optical sensors combined with micro-processor technology provides an accurate and reliable measure of smoke or dust density emissions.

The Model 252 is based on the optical cross duct measuring principle comprising of a stack mounted transmitter and receiver unit with a remote micro-processor based monitor. The instrument has been designed to project a stabilised light source and cancel the effect of any ambient light, with the result of providing an accurate and reliable measure of smoke or dust within the stack. The monitor displays a reading of the percentage of opacity (Smoke Density), optical density or particulates ( mg/m3). The monitor performs the calculations to convert from opacity to optical density for a direct reading of particulates concentration.

The Model 252 can be calibrated directly in terms of dust density mg/m3 for each specific installation and flue condition by calibrating against a specific measurement of emissions using the Iso-Kinetic sampling technique. The monitor also offers a single or dual 4-20mA output of opacity and particulates, the facility to adjust the alarm level with volt free alarm output contacts and remote alarm or zero reset.

Efficient high volume blower units ensure that the optical lenses are kept clean.

Features:

• Advanced Solid State Opto electronic sensor technology.
• Micro-processor based monitor.
• Remote mounted monitor- panel, rack or wall mounted.
• Multiple outputs, 4-20mA, RS422/485, with adjustable averaging facility.
• Adjustable, lockable, alarm setting.
• Robust stack units weatherproof to IP65.
• Stack units specifically designed as simple devices.
• Remote reset of zero or alarm.

Benefits:

• No moving parts, self compensating, repeatable readings.
• Reliable continuous monitoring of smoke or dust.
• LED display with simple keypad control.
• Communication facility for recording or logging the emissions in opacity, particulates or both.
• Volt free alarm contacts for local or remote alarm.
• Simple cross duct installation.
• Stack units can be used in hazardous areas - EEx ia IIC T6
• Automatic reset on plant startup.

See product specification 252 for further technical details.

Return to Instrumentation page.