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Marsh Bellofram
 

Pump controller
ATEX, UL913, 7m26, FOFO, SOSO Marsh Bellofram

ARM Series Alternating Triplex and Quadraplex Controllers from the Diversified Electronics division of Marsh Bellofram are available with either Sequence-On-Simultaneous-Off (SOSO) or First-On-First-Off (FOFO) output logic. The special function models are differentiated by a rotary switch that allows any output to be locked as the lead load or any one load to be omitted while sequencing only the remaining loads. In addition to load omission and lead selection, the expandable model can be set for 2, 3, or 4 load operation with either SOSO or FOFO logic.

All models feature intrinsically safe inputs and logic that allows the outputs to operate properly even if one of the inputs fails to open or close. For example: if the off switch fails to close, the lead load will not energize until both the lead and the lag switches close. An inrush delay on all models reduces line sags by preventing multiple loads from energizing simultaneously. For more information, visit www.marshbellofram.com
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