Carbon monoxide emitting apparatus, carbon monoxide monitor shutoff, and circuit therefor

• US 6,433,696 B1
• Filed: 10/25/2000
• Issued: 08/13/2002
• Est. Priority Date: 11/05/1999
• Status: Expired due to Fees

• Current Assignee: Nilfisk-Advance Incorporated (Nilfisk Holding A/S)
• Original Assignee: ALTO US Incorporated (ALTO U.S.)
• Inventors: Deiterman, Lenard, Wright, Shawn, Morse, John, Lemke, Alfred H.
• Primary Examiner(s): Lieu, Julie
• Application Number:
  US09/696,548
• Time in Patent Office: 657 Days
• Field of Search: 340/632, 340/633, 340/634, 73/232, 73/233.1, 73/250.1, 422/94, 422/98, 702/24
• US Class Current: 340/632
• CPC Class Codes: G01N 33/004 CO or CO2
• CPC Class Codes: G01N 33/0063 using a threshold to release an alarm or displaying means
• CPC Class Codes: G01N 33/48707 by electrical means G01N33/49, G01N33/493 take precedence

Abstract

A system for monitoring carbon monoxide in an environment which includes an apparatus emitting carbon monoxide, such as an internal combustion engine. A carbon monoxide sensor measures a concentration of carbon monoxide in the environment and provides an electrical signal to a processor that is representative of the measured concentration of carbon monoxide. The processor determines the concentration of carbon monoxide corresponding to the electrical signal, provides an output signal at or above predetermined carbon monoxide concentration thresholds, calculates an estimated carboxyhemoglobin level for the operator corresponding to the carbon monoxide concentrations calculated over time, and provides an output signal at or above predetermined carboxyhemoglobin thresholds. The signals are then received by one or more devices which provide textual, visual, and/or audible warnings indicating that environmental concentrations of carbon monoxide have caused a predetermined warning threshold to be met or exceeded. The signals may also be received by a device which shuts down the carbon monoxide generating apparatus.

Claims

1. A system for monitoring carbon monoxide concentrations in an environment for use with an apparatus emitting carbon monoxide, said system comprising:

a. a carbon monoxide sensor for measuring a concentration of carbon monoxide in the environment, said sensor providing a sensor signal representative of the measured concentration of carbon monoxide;

b. a memory storing data relating to past carboxyhemoglobin levels;

c. a processor receiving and responsive to the sensor signal for generating an output signal indicative of the concentration of carbon monoxide, said processor;

i. receiving the sensor signal from the carbon monoxide sensor,

ii. determining the concentration of carbon monoxide corresponding to the sensor signal,

iii. retrieving the stored carboxyhemoglobin level data from the memory,

iv. calculating a carboxyhemogolobin level corresponding to the determined concentration of carbon monoxide and the retrieved carboxyhemoglobin level data, and

v. storing the calculated carboxyhemoglobin level to memory for a predetermined period of time while the apparatus is shut off for retrieval by the processor and calculation of subsequent carboxyhemoglobin levels.

2. The system of claim 1 wherein the sensor samples the carbon monoxide levels in the environment periodically.

3. The system of claim 1 wherein a determined concentration of carbon monoxide is stored to memory.

4. The system of claim 1 wherein a time-weighted average of ambient carbon monixide concentrations is calculated from an average of the carbon monoxide concentrations determined before the apparatus is shut off and the carbon monoxide concentration determined when the apparatus is restarted.

5. The system of claim 1 wherein the signal conditions can be retrieved from memory.

6. The system of claim 1 wherein an output signal will be provided to a warning device if the shut down device is unable to shut down the apparatus.

7. The system of claim 1 wherein the processor calculates a period of time remaining until a predetermined carboxyhemoglobin level is reached.

8. The carbon monoxide emitting apparatus of claim 1 wherein the apparatus is selected from the group consisting of a floor polisher and a power washer.

9. The system of claim 1 wherein the carboxyhemoglobin levels are calculated from the stored carboxyhemoglobin level data determined before the apparatus was shut off and the carbon monoxide concentration measured when the apparatus is restarted.

10. The system of claim 1 wherein the predetermined period of time is a workshift period.

11. The system of claim 10 wherein the workshift period is eight or more hours.

12. The system of claim 1 wherein an output signal is provided at or above a specified carbon monoxide concentration or carboxyhemoglobin level threshold, the output signal activating a device selected from the group consisting of an analog display, digital display, light emitting device, sound emitting device, shut-down device for the apparatus, or combination thereof.

13. The system of claim 12 wherein an output signal is not provided if the estimated level of carboxyhemoglobin exceeds a threshold carboxyhemoglobin concentration and the estimated level of carboxyhemoglobin is less than the immediately preceding estimated level of carboxyhemoglobin.

14. The system of claim 12 wherein the conditions causing the output signal to be provided are stored to memory.

15. The system of claim 12 wherein the device displays a message stating a period of time until the apparatus is automatically shut down.

16. A carbon monoxide emitting apparatus having a carbon monoxide monitor for measuring carbon monoxide in an environment, said apparatus comprising:

a. a carbon monoxide monitor comprising;

i. a carbon monoxide sensor for measuring a concentration of carbon monoxide in the environment, said sensor providing a sensor signal representative of the measured concentration of carbon monoxide;

ii. a memory storing data relating to past carboxyhemoglobin levels;

iii. a processor receiving and responsive to the sensor signal for generating an output signal indicative of the concentration of carbon monoxide, said processor;

(1) receiving the sensor signal from the carbon monoxide sensor,

(2) determining the concentration of carbon monoxide corresponding to the sensor signal,

(3) retrieving the stored carboxyhemoglobin level data from the memory,

(4) calculating a carboxyhemoglobin level corresponding to the determined concentration of carbon monoxide and the retrieved carboxyhemoglobin level data,

(5) storing the calculated carboxyhemoglobin level data to the memory for a predetermined period of time while the apparatus is shut off for retrieval by the processor and calculation of subsequent carboxyhemoglobin levels, and

(6) providing an output signal at or above specified carboxyhemoglobin concentration thresholds; and

b. a device that indicates the output signal.

17. The carbon monoxide emitting apparatus of claim 16 wherein the sensor samples the carbon monoxide levels in the environment periodically.

18. The carbon monoxide emitting apparatus of claim 16 wherein a determined concentration of carbon monoxide is stored to memory.

19. The carbon monoxide emitting apparatus of claim 16 wherein an output signal is not provided by the processor if the estimated level of carboxyhemoglobin exceeds a threshold carboxyhemoglobin concentration and the estimated level of carboxyhemoglobin is less than the immediately preceding estimated level of carboxyhemoglobin.

20. The carbon monoxide emitting apparatus of claim 16 wherein the device is selected from the group consisting of an analog display, digital display, light emitting device, sound emitting device, shut-down device for the apparatus, or combination thereof.

21. The carbon monoxide emitting apparatus of claim 16 wherein the apparatus is selected from the group consisting of a floor polisher and a power washer.

22. The carbon monoxide emitting apparatus of claim 16 wherein the processor calculates a period of time remaining until a predetermined carboxyhemoglobin level is reached.

23. The carbon monoxide monitor of claim 16 wherein an output signal is provided at or above a specified carbon monoxide concentration threshold, the output signal activating a device selected from the group consisting of an analog display, digital display, light emitting device, sound emitting device, shut-down device for the apparatus, or combination thereof.

24. The carbon monoxide emitting apparatus of claim 16 wherein the time-weighted average of ambient carbon monoxide concentrations is calculated from an average of the carbon monoxide concentrations determined before the apparatus was shut off and the carbon monoxide concentration determined when the apparatus is restarted.

25. The carbon monoxide emitting apparatus of claim 16 wherein the carboxyhemoglobin levels are calculated from the stored carboxyhemoglobin level data determined before the apparatus was shut off and the carbon monoxide concentration measured when the apparatus is restarted.

26. A carbon monoxide monitor comprising:

a. a carbon monoxide sensor for measuring a concentration of carbon monoxide in the environment, said sensor providing a sensor signal representative of the measured concentration of carbon monoxide;

b. a memory storing data relating to past carboxyhemoglobin levels;

c. a processor receiving and responsive to the sensor signal for generating an output signal indicative of the concentration of carbon monoxide, said processor;

i. receiving the sensor signal from the carbon monoxide sensor,

ii. determining the concentration of carbon monoxide corresponding to the sensor signal,

iii. retrieving the stored carboxyhemoglobin level data from the memory,

iv. calculating a carboxyhemoglobin level corresponding to the determined concentration of carbon monoxide and the retrieved carboxyhemoglobin level data,

v. storing the calculated carboxyhemoglobin level data to memory for a predetermined period of time while the apparatus is shut off for retrieval by the processor and calculation of subsequent carboxyhemoglobin levels, and

vi. providing an output signal at or above specified carboxyhemoglobin concentration thresholds;

d. a device that indicates the output signal; and

e. electrical leads adapted to receive and transfer data between the carbon monoxide monitor and equipment powered with internal-combustion equipment that emits carbon monoxide.

27. The carbon monoxide monitor of claim 26 wherein the sensor samples the carbon monoxide levels in the environment periodically.

28. The carbon monoxide monitor of claim 27 wherein a determined concentration of carbon monoxide is stored to memory.

29. The carbon monoxide monitor of claim 28 wherein the processor calculates the carboxyhemoglobin level estimated from ambient carbon monoxide concentrations calculated up to a predefined time period prior to the carboxyhemoglobin level calculation.

30. The carbon monoxide monitor of claim 26 wherein a signal is not provided by the processor if the estimated level of carboxyhemoglobin exceeds a threshold carboxyhemoglobin concentration and the estimated level of carboxyhemoglobin is less than the immediately preceding estimated level of carboxyhemoglobin.

31. The carbon monoxide monitor of claim 26 wherein the device is selected from the group consisting of an analog display, digital display, light emitting device, sound emitting device, shut-down device for the apparatus, or combination thereof.

32. The carton monoxide monitor of claim 26 wherein an output signal is provided at or above a specified carbon monoxide concentration threshold, the output signal activating a device selected from the group consisting of an analog display, digital display, light emitting device, sound emitting device, shut-down device for the apparatus, or combination thereof.

33. A system for monitoring carboxyhemoglobin levels of people in an environment for use with all apparatus emitting carbon monoxide, said system comprising:

a. a sensor for measuring oxygen saturation or carboxyhemoglobin levels in blood, said sensor providing a signal representative of the measured oxygen saturation or carboxyhemoglobin levels; and

b. a processor receiving and responsive to the signal for generating an output signal corresponding to estimated oxygen saturation or carboxyhemoglobin levels, said processor;

i. receiving the signal from the sensor,

ii. determining the oxygen saturation or carboxyhemoglobin levels corresponding to the signal,

iii. providing an output signal at or above a specified carboxyhemoglobin level threshold.

34. The system of claim 33 further comprising a device that indicates a carboxyhemoglobin level at a specified output signal.

35. The system of claim 34 wherein the signals activate a device, wherein the device is an analog display, digital display, light emitting device, sound emitting device, shut-down device for the apparatus, or combination thereof.

36. The system of claim 33 wherein the processor calculates a period of time remaining until a predetermined carboxyhemoglobin level is reached.

37. The system of claim 33 wherein the oxygen saturation sensor is a pulse oximeter.

38. A carbon monoxide emitting apparatus having the carboxyhemoglobin level monitoring system of claim 33.

39. The system of claim 35, said processor:

a. receiving the signal from the sensor,

b. retrieving stored oxygen saturation or carboxyhemoglobin levels from memory,

c. determining the oxygen saturation or carboxyhemoglobin levels corresponding to the signal and stored oxygen saturation or carboxyhemoglobin levels,

d. storing determined oxygen saturation or carboxyhemoglobin level data to memory, and

e. providing an output signal at or above a specified carboxyhemoglobin level threshold;

wherein the stored oxygen saturation or carboxyhemoglobin levels are retained in memory for a predetermined period of time while the apparatus is shut off for retrieval and calculation of subsequent oxygen saturation or carboxyhemoglobin levels.

40. The system of claim 39 further comprising a device that indicates a carboxyhemoglobin level at a specified output signal.

41. The system of claim 40 wherein the signals activate a device, wherein the device is an analog display, digital display, light emitting device, sound emitting device, shut-down device for the apparatus, or combination thereof.

42. The system of claim 39 wherein the processor calculates a period of time remaining until a predetermined carboxyhemoglobin level is reached.

43. The system of claim 39 wherein the oxygen saturation sensor is a pulse oximeter.

44. A carbon monoxide emitting apparatus having the carboxyhemoglobin level monitoring system of claim 39.

45. The system of claim 39 the predetermined period of time is a workshift.

46. The system of claim 39 wherein the predetermined period of time is eight or more hours.

47. The system of claim 39 wherein the oxygen saturation or carboxyhemoglobin levels are calculated from stored oxygen saturation or carboxyhemoglobin levels determined before the apparatus was shut off and the oxygen saturation or carbon monoxide levels measured when the apparatus is restarted.

48. The carbon monoxide emitting apparatus of claim 39 wherein the apparatus is selected from the group consisting of a floor polisher and a power washer.