ABB
IMSQ4-1 (Questor IV)
IMSQ4-2 (Questor IV)
IMSQ4-GP (Questor IV GP)

These industrial mass spectrometers are designed for real-time monitoring and control of many petrochemical and industrial processes. These low maintenance mass spectrometers provide fast and accurate gas analysis from percent levels to parts per billion.  These quadruple mass spectrometers measure up to 128 streams quickly, accurately and almost continuously (300msec/1 sec per component). Mechanical wear is eliminated through seamless technology.

IMSQ4-1 (Questor IV) - The rugged and reliable IMSQ4-1 is designed for use in virtually any environment. 
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IMSQ4-1 Data Sheet

IMSQ4-2 (Questor IV) - The rugged and reliable IMSQ4-2 is designed for use in virtually any environment.
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IMSQ4-2 Data Sheet