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Miniram Performance in the Coal Mining Environment.

Organiscak JA; Williams KL; Ozanich TJ
Proc Respirable Dust in the Mineral Industries: Health Effects Char & Control 1988 :41-50
This paper describes an underground performance evaluation conducted by the Bureau of Mines on the miniram. This new compact light- scattering instrument measures relative instantaneous respirable dust concentrations by passively allowing environmental air to flow through an open-ended sensing chamber. A personal sampler adapter (utilizing a 10-mm nylone cyclone) that fits over the sensing chamber, in combination with a personal dust pump, also can be used to actively measure relative instantaneous dust concentrations and collect a gravimetric sample. Tests to compare the miniram (passively and actively) with the ram-1 and the personal gravimetric sampler were conducted at two continuous miner sections and one longwall section. Active sampling results indicate that the seal (foam padding) on the miniram personal sampler adapter may not be adequate in all cases and might eventually deteriorate, making the miniram's instantaneous and gravimetric measurements significantly higher than those of the ram-1 and the personal sampler. When a good seal exists between the miniram's sensing chamber and personal sampler adapter, the instantaneous and gravimetric measurements correspond well with those of the ram-1 and personal sampler. Passive sampling with the miniram yields values that are higher, although well correlated with the values obtained by active sampling using the personal sampler adapter.
Publication Date
Document Type
Fiscal Year
Identifying No.
OP 108-88
NIOSH Division
Source Name
Proc. Respirable Dust in the Mineral Industries: Health Effects, Char & Control, 1988, Pp 41-50
Page last reviewed: November 19, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division