Continuous monitoring system
Continuous monitoring system (CMS) is a comprehensive term that may include, but is not limited to, continuous emission monitoring systems, continuous opacity monitoring systems, continuous parameter monitoring systems, or other manual or automatic monitoring that is used for demonstrating compliance with an applicable regulation on a continuous basis as defined by the regulation.
Source
40 CFR § 63.2
Scoping language
The terms used in this part are defined in the Act or in this section as follows: