Toragon AB

- Model DSL-3000 - Advanced Particulate Monitor

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The DSL-3000 is an advanced particulate monitor that offers high accuracy measurements with virtually zero drift and very low maintenance. Using our Dynamic Detection Principle (DDP), sometimes known as scintillation, the DSL- 3000 is immune to the long term drift seen in traditional opacity monitors (caused by a build up of dirt or dust on the optical surfaces), and it therefore has the advantage of significantly reduced service intervals. DDP represents a very accurate measurement technique, but the elimination in drift serves to enhance this accuracy still further.

Using our Dynamic Detection Principle (DDP), sometimes known as scintillation, the DSL- 3000 is immune to the long term drift seen in traditional opacity monitors (caused by a build up of dirt or dust on the optical surfaces), and it therefore has the advantage of significantly reduced service intervals. DDP represents a very accurate measurement technique, but the elimination in drift serves to enhance this accuracy still further.

DDP involves the transmission of a beam of light across the stack, from a transmitter to a receiver, much like a traditional opacity monitor. However, instead of measuring the attenuation of the overall light strength (the DC component), we monitor the amplitude of the ripple on-top of that signal (the AC component). The ripple is introduced as interference to the light beam by the passing particulate in the stack, and the amplitude of the AC component is directly proportional to the volume of particulate passing through the light. Furthermore, as the DC light signal decreases (with the deposition of fixed particles on the external surfaces of the lenses), the variations in the AC component remain unaffected. This means that DDP can remain unaffected by dirty optics right up to the point at which there is not enough signal to make any measurement at all, where as traditional opacity monitors would have drifted all the way.

The DSL-3000 is designed to measure volumetric density (mg/m³) as its primary unit of measure and therefore requires in-situ calibration to EPA Method 5/17 or European standard EN13284-1.

The instrument consists of a pair of sensors (a transmitter and receiver) mounted on the stack using standard flange fittings, and an operator interface (a control unit) fitted up to 1km away, either at the base of the stack or in a control room.

The sensors are of rugged construction with a high environmental rating. Both heads are supplied with stainless steel air purge bodies, which when connected to an airline will serve to protect the optical surfaces from dirt and particulate deposition – prolonging service intervals. The sensors themselves are attached to the back of the air purge bodies with quick release catches, affording speedy access to the lenses for ease of maintenance.

The operator interface is housed in a rugged weatherproof enclosure designed for wall mounting. The human interface consists of a clear single line VFD display (visible in completely dark conditions as well as sunlit environments) and a 20 key numeric keypad. The wiring terminations are made to two part terminal blocks inside a terminal compartment dedicated access.

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