Correlations Between Measurements with RAM-land Gravimetric Samplers on Longwall Shearer Faces

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Abstract
Simultaneous RAM-1 and gravimetric personal sampler respirable dust measurements were made by the Bureau of Mines at two locations adjacent to a moving shearer on longwall faces. These locations were (1) 4.6 to 6.1 m (15 to 20 ft) on the ventilation intake side of the shearer headgate drum and (2) at the shearer midpoint, between the two operators. Despite the fact that the RAM-1 monitors were laboratory-calibrated to give equivalent readings, underground readings were often lower, particularly at the intake side of the shearer. The RAM-gravimetric ratio of all readings was 0.53 at the intake position and 0.75 at the midpoint position for all data. When only head-to-tail cut passes were analyzed, the RAM-gravimetric ratios were 0.53 at the intake position and 1.00 at the midpoint position. The difference between RAM arid gravimetric dust readings is attributed to a combination of factors such as ambient air velocity and cyclone orientation.

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