S-2.1, r. 14 - Regulation respecting occupational health and safety in mines

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376. A compressor shall be equipped with a thermometer with a visual indicator located on the high pressure vent side. The normal operating temperature shall be indicated by a red mark on the thermometer scale. A thermometer reading shall be made at least every 4 hours of compressor operation and shall be noted in the register of the work station concerning the compressors.
O.C. 213-93, s. 376.