Cylinder identification number (serial number).
Certified concentration within three digits of the standard (ppm or % -mole basis).
Balance gas in the standard mixture.
Cylinder pressure at time of certification.
Certification expiration date.
Reference standard identification (standard type [SRM, PRM, NTRM, or GMIS],
cylinder number and concentration).
Statement that the assay/certification conforms to EPA protocol guidelines.
Analytical method used.
Laboratory identification number (laboratory name, laboratory address).
Chronology of previous EPA protocol gas certification for this cylinder.
Analytical accuracy of the mixture.
Statement that certification was corrected for interference's (if applicable).
Ensure the concentration certified by the vendor matches the cylinder label value.
Minimum Requirements for U.S. EPA Protocol Gases
The following is the minimum information to be included when
reviewing the certification documentation for U.S. EPA Protocol gases.