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公开(公告)号：AT104766T
公开(公告)日：1994-05-15
申请号：AT87900946
申请日：1987-01-09
Applicant: ANDROS INC
Inventor： PASSARO ROBERT EUGENE , ROGERS RAYMOND EARL , GRIFFITH CRAIG JAMES
IPC: G01J1/00
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Patent Agency Ranking
公开(公告)号：AT149249T
公开(公告)日：1997-03-15
申请号：AT86906219
申请日：1986-10-10
Applicant: ANDROS INC
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公开(公告)号：NO170785B
公开(公告)日：1992-08-24
申请号：NO872417
申请日：1987-06-10
Applicant: ANDROS INC
Inventor： PARNOFF GEORGE KENNETH , ROGERS RAYMOND EARL , WILLIAMS KEVIN GRAHAM , PASSARO ROBERT EUGENE
IPC: G01N20060101 , G01N21/3504 , G01N21/35
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公开(公告)号：DE3789636D1
公开(公告)日：1994-05-26
申请号：DE3789636
申请日：1987-01-09
Applicant: ANDROS INC
Inventor： PASSARO ROBERT EUGENE , ROGERS RAYMOND EARL , GRIFFITH CRAIG JAMES
Abstract: Automatic zeroing apparatus zeroes an infrared gas analyzer automatically upon the occurrence of preselected conditions to indicate zero in the absence of absorption of infrared radiation by a gas mixture being analyzed. The gas analyzer has a sample cell for containing a gas mixture to be analyzed. Infrared radiation directed through the sample cell is detected at a preselected wavelength to produce a detection signal. A signal processor outputs a signal systematically related to the difference between the detection signal and a reference signal. For zeroing the sample cell is filled with gas substantially nonabsorbent of infrared radiation at the respective characteristic wavelength. A comparator produces an error signal when the output signal differs from zero. A gain control automatically controls the signal level of the detection signal to reduce the output signal substantially to zero with the nonabsorbent gas filling the sample cell. The preselected conditions may include the passage of a predetermined time and a temperature drift beyond a predetermined limit.
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公开(公告)号：NO170785C
公开(公告)日：1992-12-02
申请号：NO872417
申请日：1987-06-10
Applicant: ANDROS INC
Inventor： PARNOFF GEORGE KENNETH , ROGERS RAYMOND EARL , WILLIAMS KEVIN GRAHAM , PASSARO ROBERT EUGENE
IPC: G01N20060101 , G01N21/3504 , G01N21/35
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公开(公告)号：DE3789636T2
公开(公告)日：1994-08-25
申请号：DE3789636
申请日：1987-01-09
Applicant: ANDROS INC
Inventor： PASSARO ROBERT EUGENE , ROGERS RAYMOND EARL , GRIFFITH CRAIG JAMES
Abstract: Automatic zeroing apparatus zeroes an infrared gas analyzer automatically upon the occurrence of preselected conditions to indicate zero in the absence of absorption of infrared radiation by a gas mixture being analyzed. The gas analyzer has a sample cell for containing a gas mixture to be analyzed. Infrared radiation directed through the sample cell is detected at a preselected wavelength to produce a detection signal. A signal processor outputs a signal systematically related to the difference between the detection signal and a reference signal. For zeroing the sample cell is filled with gas substantially nonabsorbent of infrared radiation at the respective characteristic wavelength. A comparator produces an error signal when the output signal differs from zero. A gain control automatically controls the signal level of the detection signal to reduce the output signal substantially to zero with the nonabsorbent gas filling the sample cell. The preselected conditions may include the passage of a predetermined time and a temperature drift beyond a predetermined limit.
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