holding coil

holding coil

[′hōl·diŋ ‚kȯil]
(electronics)
A separate relay coil that is energized by contacts which close when a relay pulls in, to hold the relay in its energized position after the orginal operating circuit is opened.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Each of the Lab-on-Valve's ports is assigned a specific function, such as flow-through optical cell, sample aspiration, reagent aspiration, holding coil and waste elimination.