/ 139 AVL Blow by Meter measured using a differential pressure sensor. The shape of the orifice of the AVL Blow By Meter was selected to ensure accuracy in both flow directions while also preventing accumulations at the blind that would modify the cross-section. The selected shape of the orifice allows a broad dynamic range of 1:50. APPLICATION On the basis of the interchangeable measurement ranges between 0.2 and 2,400 l/min, the AVL Blow by Meter can be used from small-scale and single-cylinder engines to ships’ diesel engines. The areas of application cover engine research and the optimization of the piston cylinder assembly. Furthermore, this system is used when designing crankcase ventilation systems and on quality and endurance testbeds. BLOW BY MEASUREMENT Nowadays, blow-by measurement is standard on engine testbeds. To comply with exhaust gas legislation for new combustion engines, the requirements placed on crankcase ventilation systems will continue to increase. To design such systems, knowledge of the blow-by map of the engine is also required. This, together with the possibility of continuous measurement of the blow-by flow to monitor the engine condition, make the AVL Blow By Meter an indispensable instrument for engine testing. MEASUREMENT PRINCIPLE To determine the blow-by flow, the orifice measurement principle (differential pressure measurement procedure) is used. A neck (orifice) in the tube cross-section results in a pressure drop that is Differential pressure sensor Orifice Principle rp Available online via AVL ePRODUCTS https://shop.avl.com BENEFITS AT A GLANCE • The accuracy of 1% FSO (optional) and the reproducibility of 0.1% comply with the high requirements of engine measurement technology • Due to the minimum pressure drop, the blow-by behavior of the engine is hardly affected • High reliability and constant measurement readiness are realized by low dirt sensitivity • Correct detection even of inverted blow-by flows • Simple integration and installation on the testbed
Solutionskatalog2016_EN
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