Single Stage displacer switches utilize one electrical control mechanism and are factory calibrated.
Series A10 are wide differential units calibrated to actuate as a liquid level reaches a given displacer and to de-actuate when the level reaches a second displacer.
The minimum differential band is approximately 6 inches (152 mm) in water and varies somewhat with liquid specific gravity. The maximum differential is determined by the length of the displacer suspension cable.
Series A15 are calibrated to operate over a narrow level differential band and are ideally suited for liquid level alarm applications on either high or low level.
The operating level is fully adjustable simply by repositioning the displacer along its suspension cable. The differential band varies slightly with liquid specific gravity.