Patent ID: 8070423
Filing Date: 2011-12-06
Classification: F04D,F05D,F24F

Abstract:
1. A fan air flow sensor comprising: a housing having a sensor cap; a thermistor pair disposed within the housing and in housing potting to prevent movement of the thermistor pair in the housing, each thermistor projecting through the sensor cap a predetermined distance above the sensor cap up to approximately 0.03 inches, the sensor cap disposed to protect the thermistor pair from airborne particulate; a flange extending normally from the housing, the flange for flush mounting the housing on a mounting surface; a sensor circuit comprising a multiplexer for controlling each thermistor, and for measuring a condition of each thermistor, and for receiving and transmitting signals, and a microprocessor to calculate air velocity and temperature; a control transmitter connected to the multiplexer for displaying the air velocity and temperature; and a cable for connecting the sensor to a multiplexing circuit.