公开(公告)号：EP1070231A1

公开(公告)日：2001-01-24

申请号：EP99913009.9

申请日：1999-04-08

申请人： EMAIL LIMITED

发明人： TRIMM, David, Lawrence ,  TORPY, Keith, Mario

IPC分类号： G01F1/66 ,  G01F1/69 ,  G01N25/30

CPC分类号： G01N33/225 ,  G01N27/16

摘要： A gas meter (10) determining the calorific value of the gas passing through the meter is disclosed. The meter includes a reaction chamber (28) that draws gas from the gas flow path and an air intake (30). The calorific value is determined using a resistor (36), coated with a catalyst material, that forms part of a wheatstone bridge circuit. Oxidation of the gas/air mixture on the surface of the resistor (36) causes a temperature and resistance change dependent on the calorific value of the gas that can be detected by the wheatstone bridge.