30 C.F.R. § 77.314 Automatic temperature control instruments.
Title 30 - Mineral Resources
(a) Automatic temperature control instruments for thermal dryer system shall be of the recording type. (b) Automatic temperature control instruments shall be locked or sealed to prevent tampering or unauthorized adjustment. These instruments shall not be set above the maximum allowable operating temperature. (c) All dryer control instruments shall be inspected and calibrated at least once every 3 months and a record or certificate of accuracy, signed by a trained employee or by a servicing agent, shall be kept at the plant.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart D—Thermal Dryers
§ 77.314 Automatic temperature control instruments.
