American Industrial Hygiene Conference and Exposition, June 1-6, 2002, San Diego, California. Fairfax, VA: American Industrial Hygiene Association, 2002 Jun; :47
The Automated Breathing and Metabolic Simulator (ABMS) simulates human oxygen consumption, carbon dioxide production, minute ventilation, and breathing waveforms. Using metabolic data collected during a one-hour Man Test 4 performed by human subjects, two ABMS Man Test 4 protocols were developed: one simulating an 86 kg subject (MT4-50) and one simulating a 104 kg subject (MT4-95). NIOSH-approved 6O-minute self-contained self-rescuer (SCSR) models A, B, C, and D (one compressed-oxygen, three chemical-oxygen models) were tested using MT4-50 (n=4) and MT4-95 (n=4). Test duration was determined using the following criteria: average inhaled 02 (PI02) < 19.5%, average inhaled CO2 (PIC02) > 4%, minimum inhaled CO2 (FIC02min) > 1.5%, peak exhalation pressure (PE) > 350 mmH20, peak inhalation pressure (PI) < -350 mmH20, end-inhaled dry-bulb temperature (Tdb) > 56°C, and end-inhaled wet-bulb temperature (Twb) > 500C. For MT4-50, duration was 65.5, 90.3, 66.3, and 75.5 min; and for MT4-95, duration was 45.3, 66.0, 50.3, and 63.8 min for models A, B, C, and D, respectively. During the sample period at minute 60 of MT4-50, FI02 was 80.8, 58.6, 82.8, and 86.3%; FIC02 was 2.4, 0.6,2.4, and 1.3%; FIC02min was 0.2, 0.2, 0.0, and 0.0%; PE was 208, 42, 46, and 59 mmH20; PI was -190, -30, -52, and -46 mmH20; Tdb was 53.3, 43.0, 49.7, and 44.8°C; and Twb was 46.1, 43.1, 43.1, and 39.7°C for models A, B, C, and D, respectively. During the minute 60 sample period of MT4-95, FIO2 was 35.1 and 74.9%; FICO2 was 1.1 and 1.8%; FICO2min was 0.6 and 0.0%; PE was 53 and 65 mmH20; PI was -49 and -67 mmH20; Tdb was 46.7 and 46.4°C; and Twb was 46.7 and 43.1 OC for models B and D, respectively. These data demonstrate that the SCSR's performed as expected during the ABMS Man Test 4.