Gas sensor with smart pellistor

• US 8,146,403 B2
• Filed: 09/11/2008
• Issued: 04/03/2012
• Est. Priority Date: 09/17/2007
• Status: Expired due to Fees

• Current Assignee: Life Safety Distribution AG (Honeywell International Inc.)
• Original Assignee: Life Safety Distribution AG (Honeywell International Inc.)
• Inventors: Cowburn, Anthony R., Gilby, Jonathan H., Davies, David F.
• Primary Examiner(s): Williams, Hezron E
• Assistant Examiner(s): Frank, Rodney T
• Application Number:
  US12/209,086
• Publication Number:
  US 20090223278A1
• Time in Patent Office: 1,300 Days
• Field of Search: 73/232, 73/233.1, 73/250.1
• US Class Current: 73/23.2
• CPC Class Codes: G01N 27/16 caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas

Abstract

A gas sensor includes a gas responsive pellistor and associated information specific to that pellistor. The information can include environmental compensation information, such as temperature or humidity compensation information or other manufacturing information, and is stored in a computer readable medium. Such information can be used by local circuitry in compensating the sensor while making ambient gas level determinations.

Claims

1. An assembly comprising:

a housing;

a resistive, gas responsive sensor element carried by and within the housing;

a compensator element carried by and within the housing;

a plurality of electrical connectors extending from the housing, each of the electrical connectors forming a direct electrical connection with at least one of the resistive, gas responsive sensor element and compensator element within the housing via one or more electrical traces and tracks; and

a representation of individual sensor-specific information carried, in a non-transitory computer readable medium, by and within the housing, the non-transitory computer readable medium is electrically connected within the housing in parallel with the compensator element via the plurality of electrical connectors, the representation includes at least one of sensor-specific temperature compensation information, or sensor-specific humidity compensation information to allow for individual sensor compensation and where the at least one of sensor-specific temperature compensation information, or sensor-specific humidity compensation information of the non-transitory computer readable medium is accessible by circuits external to the housing via the plurality of connectors.

2. An assembly as claim 1 where the computer readable medium includes at least one of a storage device for the compensation information, the storage device is coupled to the sensor, or, a bar coded label carried by the housing which exhibits the representation of the information.

3. An assembly as in claim 2 which includes a second resistive sensor carried by the housing.

4. An apparatus as in claim 3 where the sensors are coupled in one of, series or parallel.

5. An apparatus as in claim 4 where the device is coupled in parallel with at least one sensor and comprises a storage circuit.

6. An apparatus as in claim 5 where the housing carries a plurality of contacts external thereto with the contacts coupled to the sensors.

7. An apparatus as in claim 6 where first and second of the contacts are coupled to one sensor with, second and third contacts coupled to the other sensor.

8. An apparatus as in claim 7 where the sensors are series coupled between the first and third contacts.

9. An apparatus as in claim 8 which includes a resistive bridge circuit, external to the housing and coupled to the contacts.

10. An apparatus as in claim 8 which includes control circuits coupled to the contacts, responsive to sensor outputs that provide indicia indicative of sensed ambient gas.

11. An apparatus as in claim 10 where the control circuits include a programmable processor and associated control software.

12. A method comprising:

before assembly, detecting individual sensor-specific temperature variation characteristics of a selected resistive gas sensor;

storing a representation of the individual sensor-specific detected temperature characteristics in a non-transitory computer readable medium within a housing of the selected resistive gas sensor;

during assembly, associating the stored representation of the individual sensor-specific detected temperature characteristics with the sensor;

during assembly, providing a plurality of connectors extending into the housing, each connecting to one of a compensator element and gas sensing element of the selected resistive gas sensor and electrically connecting within the housing of the selected resistive gas sensor the non-transitory computer readable medium in parallel with the compensating element of the selected resistive gas sensor via the plurality of conductors; and

using the individual sensor-specific stored representation to temperature compensate the sensor.

13. A method as in claim 12 where storing includes storing the representation in at least one of a computer readable database, a computer readable bar code, or, a computer readable storage circuit.

14. A detector comprising:

a housing;

a socket carried by the housing;

a gas sensor which includes a gas responsive element, a compensation element, a plurality of connectors extending into the gas sensor where each of the plurality of connectors electrically connects to at least one of the gas responsive and compensator elements and associated individual sensor-specific environmental compensation information specific to the gas responsive element, the gas sensor releasably carried by the housing via operation of the plurality of connectors, the associated individual sensor-specific environmental compensation information loaded in a non-transitory computer readable medium that is also carried within by the gas sensor, the compensator element and non-transitory computer readable medium electrically connected in parallel within the gas sensor; and

gas level detecting control circuits, coupled to the individual sensor-specific environmental sensor and temperature compensation information, and responsive thereto.

15. A detector as in claim 14 which includes a socket coupled to the control circuits, the sensor releasably engages the socket.

16. A detector as in claim 15 where the information is carried by the sensor in a computer readable medium.

17. A detector as in claim 16 where the computer readable medium comprises at least one of an electronic storage circuit, or a printed bar code.

18. A detector as in claim 14 where the information is selected from a class which includes at least temperature compensating information and humidity compensating information.

19. A method comprising:

providing a gas responsive detector element and compensator element;

before assembly, establishing individual sensor-specific temperature compensation information relative to that gas responsive detector element;

during assembly, coupling the individual sensor-specific information to the gas responsive detector element; and

incorporating the gas responsive detector element, the compensator element and a non-transitory computer readable medium loaded with the information into a housing of a gas detector along with a plurality of connectors extending through the housing where each of the plurality of connectors connects to at least one of the gas response detector element and compensator element and;

electrically connected the compensator element in parallel with the non-transitory computer readable medium within the housing; and

accessing the sensor-specific temperature compensation information of the non-transitory computer readable medium via the plurality of connectors.

20. A method as in claim 19 which includes, exposing the pellistor to a selected ambient atmosphere;

making a determination of an ambient gas concentration taking into account pre-stored temperature compensation information specific to that gas responsive detector element; and

generating at least one of a visually perceptible as level indicating iridicium, or an audible gas level indicating indicium.

21. A method as in claim 20 which includes, replacing the gas responsive detector element with another gas responsive detector element and associated temperature compensation information;

and

making a determination of an ambient gas concentration taking into account pre-stored temperature compensation information specific to that another gas responsive detector element; and

generating at least one of a visually perceptible gas level indicating indicium, or an audible gas level indicating indicium.