Three qualitative respirator fit tests were evaluated for their ability to adequately measure respiratory protection. The evaluated methods were the negative pressure test, the isoamyl acetate test, and the irritant smoke test. Each test was performed concurrently with a single quantitative fit test, the dioctylphthalate (DOP) test, during 274 half-mask and 274 full facepiece wearings. The quantitative values of DOP penetration obtained after passing or failing each qualitative fit test were lognormally distributed. For each qualitative test performed on each mask type, the average log penetration values obtained after passing and failing each test were statistically different from each other. The mean of the log penetration values associated with the failed qualitative test was always larger than the mean of the log penetration values associated with passed qualitative tests for all three qualitative methods. Most (95%) of the tested study had adequately fitting respirators as determined by quantitative testing. Of these subjects, 96% to 100% passed the qualitative fit tests. Of the 5% of the study subjects with inadequately fitting half mask respirators, 93% to 100% of the inadequate fits were detected by qualitative methods. Twenty three to 46% of the poorly fitting full face masks were detected by qualitative methods. The probability of passing or failing a qualitative test with an inadequately fitting respirator can be estimated; however, the uncertainty associated with each estimate is large due to the small number of study subjects with poorly fitting respirators.
This report was prepared as aa accouat of work spoasored by aa ageacy of the Uaited Sutes Government. Neither the Unite? States Government aor aay ageacy thereof, aor aay of their employee*, makes aay warranty, CSI^N^M or implied, or assumes aay legal liability or rcspoacibilily for the sccuracy, completeaess, or usefulness of aay information, apparatus, product, or process disclosed, or represents that itit use would not infringe privately cwaed rights. Refer ence herein to any specific coauoerdai product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom mendation, or favoring by the United Stales Govemmeat or aay agency thereof. The *iews and opinion of authors expressed herein do not aecessarily state or reflect those of the United States Govenuneat or any ageacy thereof. MTKE tt baa beM raarodacwl frem tte test available caay * perarit the broadest aassHKe avai'sWWy.
This manual describes the installation, operation, and maintenance of the LLNL filter-life tester Q-250. This apparatus is designed to determine the gas life of a variety of chemical filters, such as MIO-A1, Mll, M13-A2, C2, and similar filters. The LLNL filter-life tester can generate isopropymethylphosphonoflouridate (GB) or dimethylmethyiphosphonate (DMMP) vapors in air at flow rates of up to 50 lpm. These filters and their specifications are listed in Appendix A. CAUTION: Personnel performing operations with this tester must be completely @ familiar with the contents of this manual, knowledgeable in system operation, and knowledgeable of materials used in operation of the LLNL filter-life tester. 2.0 Outline of Method O 3.2.2 Downstream Detector. A Meloy SA 160-2 is an acceptable downstream analyzer (available from Columbia Scientific Industries Corp.). O 3.2.3 Chart Recorders. One double-pen chart recorder is required to monitor the upstream and downstream analyzers. A Hewlett-Packard Model 7132A recorder is acceptable for this task. 4.0 Utilities and Facilities Q 4.1 Utilities 4.1.1 Vacuum Supply. A vacuum supply of approximately 25 in. of mercury is required. 4.1.2 Air Supply. A clean, bone-dry, compressed-air supply of at least 50 psig is required. This will serve as both the zero gas to the upstream gas analyzer and the air supply to the va_)or • generator. 4.1.3 Electrical Power. Single phase, 60-Hz, 120-V AC capable of delivering 15 _. 4.1.4 Water Supply. If a water bath "s to be used to heat the vapor generator, a large supply of distilled or deioniz_,d water shall be available. @ 6.2 Control Box (1) • 6.2.1 Main Power On Switch (2). Located at the back of the control box, this switch controls the power to the control box. 6.2.2 Power Indicator Light (3). Located on the front of the control box, this light indicates when power is available to the control box. Q 6.2.3 System Power Off Button (4). This switch controls the power to the solenoid valves on the LLNL filter-life tester, lt must be pulled out to power the vapor generator. 6.2.4 Vapor Generator Mode Buttons (5, 7, 9, 11). These buttons control ai_rflowthrough the LLNL filter-life tester. • 6.2.5 Vapor Generator Mode Lights (6, 8, 10, 12). These lights indicate the state of the LLNL filterlife tester. 6.2.6 Upstream Analyzer Mode Switch (13). This switch controls flow to the upstream analyzer. 6.2.7 Downstream Analyzer Mode Switch (14). This switch controls flow to the downstream • analyzer. 6.2.8 Thermocouple Indicator (15). This type J(iron-constantan) thermocouple indicator displays the bulk temperature (°C) of the fluid in the vapor generator. 6.2.9 Machine Timer (16). The machine timer displays the running time of the LLNL filter-life • tester. The machine clock runs whenever the LLNL filter-.life tester is in the PURGE, GENERATE,or TEST mode.
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