Patent ID: 8000907
Filing Date: 2011-08-16
Classification: G01F

Abstract:
1. A probe for a fluid flow rate sensor comprising: a body having an upstream end and a downstream end, the body defines a passageway extending between the upstream end and the downstream end; a substrate in the passageway that has a first side and a second side that is opposite to the first side; a detection circuit disposed on the first side that includes a first thermistor and a second thermistor that are both within the passageway, the first thermistor is proximate to the upstream end and the second thermistor is proximate to the downstream end, the detection circuit is adapted to provide a voltage that varies in response to a change in temperature of the first thermistor and the second thermistor; and a heating circuit disposed on the second side that is electrically insulated from the detection circuit and includes a resistor proximate to the second thermistor such that the resistor is in thermal communication with the second thermistor and not the first thermistor; and a housing comprising a thermally conductive polymeric material and encapsulating a first portion of the substrate to protect the substrate from moisture and abrasion.