The analyser takes a continuous sample from the stack under iso-kinetic conditions in a sampling head which is close coupled to the analyser. On passing into the analyser, water droplets or steam below dew point are evaporated in a cylindrical heated vapourising system to create dry flue gas above dew point. The heated flue gas then passes into a measurement cell, where the particulate concentration is measured using a ProScatter™ laser scatter system. The sampling system is powered by an inbuilt venturi pump meaning there are no moving parts or fans to block or contaminate. Flue gas is returned to the stack by the same sampling port as the sample is taken.
Core Features of the Technology are:
- The compact and unique cyclonic vaporising system permits a larger more representative flue gas sample to be heated compared to systems using line heating or heated dilution air.
- The dust measurement sensor is a ProScatter™ laser scatter device with the advantages of cone scatter measurement giving:
- high signal to noise and stable measurement at particulate concentration levels as low as 0.1mg/m3.
- an automatic span/contamination check mechanism to challenge the instrument without introducing an exposed moving detector mechanism.
- The sample pump can be adjusted to different flow rates, allowing iso-kinetic and representative sampling of the stack gas.
- The system has in-built automatic monitoring of all active components to confirm reliable and correct operation of the complete system (including both sampling system and analyser).