| 摘要 |
A portable hand-held oxygen monitor for monitoring oxygen in a weld zone includes a user interface having an alphanumeric display and one or more user interface buttons. An audiovisual alarm includes an indicator light and an audio output device, the indicator light being separate and distinct from the alphanumeric display. The oxygen monitor implements an oxygen monitoring mode responsive to activation of one or more of the user interface buttons, wherein (1) a gas sample is obtained, (2) a digital gas sample oxygen level value is generated, and (3) the gas sample oxygen level value is compared to a stored oxygen level alarm value, and the audiovisual alarm is activated if the gas sample oxygen level value is less than the oxygen level alarm value. The activating includes illuminating the indicator light and generating sound from the audio output device to alert a monitor user that is safe to weld. |
| 主权项 |
1. A portable hand-held oxygen monitor for monitoring oxygen in a weld zone, comprising:
a monitor housing, said housing having a front, a back, a top, a bottom, and two sides extending between said front and back and said top and bottom; said housing having a hand-holding portion that is sized and configured to be held in the palm of a hand of a monitor user, with the user's thumb engaging one of said sides and the user's remaining fingers engaging the other of said sides; a user interface on said front of said housing, said user interface including an alphanumeric display and one or more user interface buttons; an audiovisual alarm comprising an indicator light on said front of said housing and an audio output device within said housing, said indicator light being separate and distinct from said alphanumeric display; a power switch on said housing; a quick-connect gas port on said housing operable to connect said oxygen monitor to a gas sampling probe; a digital communication port on said housing operable to connect said oxygen monitor to a computer via a data cable; a charge port on said housing operable to connect said oxygen monitor to a charging device; an electrochemical oxygen sensor within said housing; a pump within said housing having a pump inlet in fluid communication with said gas port and a pump outlet in fluid communication with said oxygen sensor; a microcontroller within said housing, said microcontroller including a microcontroller coupled to memory comprising a non-transitory computer-readable storage medium, said microcontroller being connected to said user interface, said audiovisual alarm, said digital communication port, said oxygen sensor, and said pump; a direct current power source within said housing operable via said power switch and connected to provide electrical power to said microcontroller, and to receive electrical power from said charge port; said memory of said microcontroller storing program instructions that program said microcontroller to perform program operations, said program operations comprising: implementing an oxygen monitoring mode responsive to activation of one or more of said user interface buttons, wherein (1) said microcontroller activates said pump to draw a gas sample from said gas port and deliver it to said oxygen sensor, (2) said oxygen sensor detects an amount of oxygen in said gas sample and outputs a corresponding voltage that is processed into a digital gas sample oxygen level value, (3) said microcontroller comparing said gas sample oxygen level value to an oxygen level alarm value stored in said memory, and activating said audiovisual alarm if said gas sample oxygen level value is less than said oxygen level alarm value, said activating comprising illuminating said indicator light and generating a sound from said audio output device to alert a monitor user that is safe to weld. |
