30 CFR § 71.205 Approved sampling devices; operation; air flowrate.
(a) Sampling devices approved in accordance with part 74 (Coal Mine Dust Personal Sampler Units) of this title shall be
operated at the flowrate of 2.0 liters of air per minute, or at a different
flowrate as prescribed by the Secretary and the Secretary of Health and
Human Services for the particular device.
(b) Each approved sampling device shall be examined each shift by a
person certified in accordance with §71.202 (Certified
person; sampling) during the second hour after being put into operation to
assure that the sampling device is operating properly and at the proper
flowrate. If the proper flowrate is not maintained, necessary adjustments
shall be made by the certified person.
(c) Each sampling device shall be examined each shift by a person
certified in accordance with §71.202 (Certified
person; sampling) during the last hour of operation to assure that the
sampling device is operating properly and at the proper flowrate. If the
proper flowrate is not maintained, the respirable dust sample shall be
transmitted to MSHA with a notation by the certified person on the dust data
card stating that the proper flowrate was not maintained.
