30 CFR § 70.203 Certified person; maintenance and calibration.
(a) Approved sampling devices shall be maintained and calibrated by a
certified person.
(b) To be certified, a person shall pass the MSHA examination on
maintenance and calibration procedures for respirable dust sampling
equipment.
(c) A person may be temporarily certified by MSHA to maintain and
calibrate approved sampling devices if the person receives instruction from
an authorized representative of the Secretary in the maintenance and
calibration procedures for respirable dust sampling equipment under this
rule. The temporary certification shall be withdrawn if the person does not
successfully complete the examination conducted by MSHA on maintenance and
calibration procedures within six months from the issue date of the
temporary certification.
