The DFS–221 is equipped with two convenient sample line connectors (1⁄4″ OD slip-on fittings) that accept flexible tubing.
The plated housing contains a diaphragm and a snap-acting SPDT switch. The sample line connections located on each side of the diaphragm accept flexible tubing. The electrical connection consists of male 1⁄4″ quick connect terminals.
The SPDT snap action switch operates on pressure rise of 0.05″w.c., ± 0.02″ w.c.