Gas measurement system
View Patent ↗A gas measurement system comprising a probe ( 10 ), the probe ( 10 ) comprises a sensor circuit comprising a thermal dispersion sensor ( 23 ) and a reference thermistor ( 24 ), the thermal dispersion sensor and the reference thermistor are disposed within a shroud ( 20 ), the shroud partially enclosing the thermal dispersion sensor and the reference thermistor such that a gas flow through the shroud is substantially representative of the gas flow through a gas duct, the probe further comprises an elongate member ( 27 ) having an aerodynamic form, the shroud is mounted to the elongate member, the elongate member mountable within the gas duct, and a microprocessor for receiving a signal from the thermal dispersion sensor and the reference thermistor, the microprocessor calculating and displaying a gas velocity and gas temperature.
1. A gas measurement system comprising:
a probe ( 10 );
the probe ( 10 ) comprises a sensor circuit comprising a thermal dispersion sensor ( 23 ) and a reference thermistor ( 24 );
the thermal dispersion sensor and the reference thermistor are disposed within a shroud ( 20 );
the shroud partially enclosing the thermal dispersion sensor and the reference thermistor such that a gas flow through the shroud is substantially representative of the gas flow through a gas duct;
the probe further comprises an elongate member ( 27 ) having an aerodynamic form, the shroud is mounted to the elongate member, the elongate member mountable within the gas duct; and
a microprocessor for receiving a signal from the thermal dispersion sensor and the reference thermistor, the microprocessor calculating and displaying a gas velocity and gas temperature.
2. The gas measurement system as in claim 1 , wherein:
the thermal dispersion sensor comprises a thermistor; and
the thermistor comprises an epoxy coating to resist corrosion.
3. The gas measurement system as in claim 1 , wherein a shroud entry area is rectangular.
4. The gas measurement system as in claim 1 , wherein two or more probes are disposed within the duct.
5. The gas measurement system as in claim 1 , wherein the gas duct is rectangular.
6. The gas measurement system as in claim 1 , wherein the gas duct is circular.
7. The gas measurement system as in claim 1 further comprising a multiplexer circuit connected to each sensor circuit.
8. A gas measurement system comprising:
a probe ( 10 );
the probe ( 10 ) comprises a sensor circuit comprising a first thermistor ( 23 ) and a second thermistor ( 24 );
a multiplexer circuit is connected to each sensor circuit;
the first thermistor and the second thermistor are disposed within a shroud ( 20 ), the shroud having a rectangular entry area;
the shroud partially encloses the first thermistor and the second thermistor such that a gas flow through the shroud is substantially representative of the gas flow through a gas duct;
the probe further comprises an elongate member ( 27 ) having an aerodynamic form in cross-section with respect to a gas flow direction, the shroud is mounted to the elongate member, the elongate member mountable within the gas duct; and
a microprocessor for receiving a signal from the multiplexer circuit, the microprocessor calculating and displaying a gas velocity and a gas temperature.
9. The gas measurement system as in claim 8 , wherein:
the thermal dispersion sensor comprises a thermistor; and
the thermistor comprises an epoxy coating.
10. The gas measurement system as in claim 8 , wherein a shroud entry area is rectangular.
11. The gas measurement system as in claim 8 , wherein two or more probes are disposed within the duct.
12. The gas measurement system as in claim 8 , wherein the gas duct is rectangular.
13. The gas measurement system as in claim 8 , wherein the gas duct is circular.
14. A gas measurement system comprising:
a probe ( 10 );
the probe ( 10 ) comprises a sensor circuit comprising a thermal dispersion sensor ( 23 ) and a reference thermistor ( 24 ), a multiplexer circuit connected to each sensor circuit and having calibration data for the thermal dispersion sensor;
the thermal dispersion sensor ( 23 ) and the reference thermistor ( 24 ) each comprising an epoxy coating;
the thermal dispersion sensor and the reference thermistor are disposed within a shroud ( 20 ), the shroud having a rectangular entry area;
the shroud partially encloses the thermal dispersion sensor and the reference thermistor such that a gas flow through the shroud is substantially representative of the gas flow through a gas duct;
the probe further comprises an elongate member ( 27 ) having an aerodynamic form, the shroud is mounted to the elongate member, the elongate member mountable within the gas duct; and
a microprocessor for receiving a signal from the multiplexer circuit, the microprocessor calculating and displaying a gas velocity and a gas temperature.
15. The gas measurement system as in claim 14 , wherein two or more probes are disposed within the duct.
16. The gas measurement system as in claim 14 , wherein the gas duct is rectangular.
17. The gas measurement system as in claim 14 , wherein the gas duct is circular.