ML 9830A and ML9830B Review, Maintenance and Upgrade

The Monitor Labs ML9830A, ML9830B and ML 9832 Carbon Monoxide analyzers uses non-dispersive infrared (NDIR) gas correlation filter technology for quantifying carbon monoxide in air. A narrow band pass filter is incorporated to ensure only the CO sensitive wavelengths are measured. The ML9830 instrument features a concentration range of 0-200ppm, while a range of 0-3000ppm is available in the ML9832.

The ML 9830 is able to be features an option of an internal or external sample pump. Typical operational time of these internal pumps is expected to be between 3-5 years before any maintenance is required. In fact the life of the pump may in some cases be extended through flipping the carbon vanes on the pump. You should only consider this as only a temporary fix, designed to maintain instrument operation until the pump can be serviced replaced. External pump versions use critical orifices to maintain sample flow. You should consult with an air monitoring equipment specialist company to assist with the upgrade. We suggest that a simple upgrade path would be to discuss your needs with American Ecotech as their product line is well suited for a smooth upgrade.

The ML9830 contains a CO scrubber for background measurements with a life time of between 1 to 3 years before replacement. The efficiency of the CO scrubber should be checked on an annual basis. In addition, the in-line filter on the instrument should be changed on an annual basis. Annual maintenance on the ML 9830 consists of the replacement of o-rings in the measurement cell and cleaning of the measurement cell including the mirrors. Annual service kits for the ML 9830 include all the necessary o-rings and other items required for maintenance. Care must be taken when cleaning the mirrors so that they do not fall out of alignment. Mirror alignment is precise and must be performed in the factory of a professional air monitoring equipment company using a specifically designed laser jig.

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