Actual interval of filtration, expressed in units of time, e.g. hours or days.
the unit of frequency; one Hertz has a periodic interval of one second
An interval of time roughly equivalent to 1 Earth year.
or Hertz; The measurement of the time period of one alternating electric current. In the United States this is commonly 60 cycles per second, or 60 Hertz.
Filtration interval; length of time filter operates before cleaning.
The periodic removal of obsolete copies of vital records and their replacement with copies of current vital records. This may occur daily, weekly, quarterly, annually or at other designated intervals.
A price pattern of movement that regularly occurs in a given time interval.