Fail-safe oxygen measuring system increases the efficiency of pellet heaters
11 May 2010
Increasing numbers of households are now turning to wood or pellet heaters for their central heating systems. Using the fail-safe MF010-O-LC oxygen measuring system from J. Dittrich Elektronic it is possible to determine the residual oxygen content in furnace exhaust gas. With the help of a controller, the excess air necessary for reasons of safety can be minimised and combustion optimised, thereby increasing efficiency.
Fail-safe oxygen measuring system increases the efficiency of pellet heaters
Emission values in the exhaust gas fall. In addition, it is possible to compensate for fluctuations in the calorific value of the fuel or in the fuel supply.
Contrary to a lambda probe which measures the relative oxygen content, the extremely robust oxygen measuring system determines the absolute content, i.e. the oxygen partial pressure in the exhaust gas. For this reason, fluctuations in air pressure, humidity and temperature have no influence on the accuracy of the measurement. The system is calibrated electrically, without reference gas and without additional personnel, in atmospheric air, thereby reducing maintenance work. This is made possible by a dynamic zirconium dioxide sensor and intelligent hardware. The measuring system monitors its own functions and reports hardware and software faults via a digital channel. There is also an analogue output (4-20 mA or 0-10 V). Measuring range is from 0.1 to 25% by vol. oxygen at an exhaust gas temperature of up to +250°C. The device has long been used in oil and gas heaters and so is proven in practice.
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