| 摘要 |
PURPOSE:To make an inspection and a maintenance unnecessary by converting a detected amount of a detecting means of a current loaded to a driving motor for a waste gas drawing blower to a waste gas flow rate, basing on the waste gas flow rate - the load current characteristics of the motor obtained previously. CONSTITUTION:The load current characteristics of the waste gas flow rate motor 3 obtained based on an opening degree of an entrance damper 2 of the drawing blower 1, a static pressure characteristics of th blower 1 and the load current characteristics of the motor 3 are stored. The detected value (load current IM) of a current converter 4 is converted into the waste gas flow rate basing on the load current characteristics. The load current IM of the motor 3 is supplied to the first or second converter 7, 8 through a comparison arithmetic device 5, a changeover device 6. There, the current is converted into the waste gas flow rate and is inputted to a suitable display recording means, etc. through an OR circuit 9. |
