Correction

An error appeared in two of the drawings in the article, "Using intrinisically safe systems to protect plant processes," (PE September 1998, p 129, File 8501). In Figures 6 and 7, the labels for the hazard areas are reversed.
By Staff November 1, 1998

An error appeared in two of the drawings in the article, “Using intrinisically safe systems to protect plant processes,” (PE September 1998, p 129, File 8501). In Figures 6 and 7, the labels for the hazard areas are reversed. The corrected drawings appear below.