eCFR Appendix B 
[ecfr.gov]
Performance Specification (PS)- specification and testing procedures for continuous monitoring systems.
CMS: Continuous Monitoring Systems
COMS: Continuous Opacity Monitoring Systems
CEMS: Continuous Emissions Monitoring SystemsCERMS: Continuous Emission Rate Monitoring Systems
FTIR: Fourier Transform Infrared Spectroscopy
PEMS: Predictive Emissions Monitoring Systems
CPMS: Continuous Parameter Monitoring Systems
PS-1: COMS
PS-2: SO2 and NOx CEMS
PS-3: O2 and CO2 CEMS
PS-4: CO CEMS
PS-4A: CO CEMS
PS-4B: CO and O2 CMS
PS-5: TRS (Total Reduced Sulfur) CEMS
PS-6: CERMS
PS-7: Hydrogen Sulfide CEMS
PS-8: VOC CEMS
PS-8A: Total hydrocarbon CMS
PS-9: Gas Chromatographic CEMS
PS-11: PM CEMS
PS-12A: Total Vapor Phase Mercury CEMS
PS-12B: Total Vapor Phase Mercury using Sorbent Trap Monitoring System
PS-15: Extractive FTIR CEMS
PS-16: PEMS
PS-17: CPMS {proposed 10/9/2008 - not finalized yet}
PS-18: Gaseous Hydrogen Chloride CEMS at stationary sources