purge meter interlock

purge meter interlock

[′pərj ¦mēd·ər ′in·tər‚läk]
(mechanical engineering)
A meter to maintain airflow through a boiler furnace at a specific level for a definite time interval; ensures that the proper air-fuel ratio is achieved prior to ignition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.