... dust sampler,digital timer,constant flow circuit,low voltage protector,intrinsically safe circuit,compact structure. ApplicationThis product ... of aspirator, digital timer, flux constant circuit, under voltage protector, and intrinsically safe power. Equipped with a group ... exist.Main SpecificationItemSpecificationFlow2L/minMeasuring Error≤±5.0 %FSStability≤3.0%FS (within 8 hours)Load capacity≥ ...