MultiVapor is a computer program that helps determine the duration of air-purifying respirator cartridges used to filter out toxic organic vapors from the air. It can also be used for larger filters and for carbon beds of any size for laboratory studies. The program helps calculate the breakthrough time, which is the amount of time after the first continuous use of a cartridge when the user may be exposed to a certain concentration of hazardous vapor. The service life is the breakthrough time plus the amount of time the cartridge can be used.
MultiVapor™ is a computer tool for estimating breakthrough times and service lives of air-purifying respirator cartridges manufactured to remove toxic organic vapors from breathed air. It can also be used for larger filters and for carbon beds of any size prepared for laboratory studies. A breakthrough time is the time following the first and continuous use of a cartridge after which the user of the cartridge could be exposed to a selected concentration of a harmful vapor. This is the consequence of the cartridge being used up. Service life is the breakthrough time with, possibly, a safety factor applied. MultiVapor™ is intended to help an industrial hygienist or other qualified person to set cartridge change-out schedules. It is not a substitute for regulatory requirements or professional judgments. Users must assume full responsibility for any application of the MultiVapor™ computer software. No warranties related to the software are expressed or implied by the National Institute for Occupational Safety and Health or its contractors. This software is intended to provide estimates based on the latest scientific information. The accuracies of any such estimates will depend in part on the accuracy and validity of the data entered by the user.
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