Personal Dust Exposure Monitor Based on the Tapered Element Oscillating Microbalance.
NTIS: PB/84-173749 Available for Reference At Bureau of Mines Libraries :89 pages
Current state-of-the-art microweighing technology represented by the tapered element oscillating microbalance (teom) is utilizd as the basis for a new generation of personal dust exposure monitors (pdem). Two design configurations are presented. The first is an end-of-shift analysis system that uses small teom-pdem cannisters to replace the filter cartridges in the current pdem system. All other components carried by the miner (cyclone preseparator and pump) are the same. After the shift, the teom cannister is plugged into an interface box that enables a minicomputer to automatically identify the unit, determine the dust mass increase during the shift, compute the shift average dust mass concentration, and print out and/or store the data. The second design is a realtime teom-pdem system that is capable of operation over a 10-h shift and, on demand, display real-time dust concentration level, time-weighted average, and shift average concentration. A description of the system consisting of six teom cannisters, interface electronics, and a minicomputer is given. The system represents a significant advance in the dust monitoring program in terms of accuracy and automation.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/84-173749. Available for Reference At Bureau of Mines Libraries.
Rupprecht and Patashnick Company