The KNF Type NMP05 diaphragm micropump for sampling air and gases is available from KNF Neuberger (Trenton, NJ). It provides efficient operation for a wide range of portable, battery operated equipment applications. The miniature pump measures 17 x 26 x 31 mm, and weighs 18 g. Features include a bolted-on pump head for gas tightness and a molded diaphragm with structured surface enabling maximum end vacuum. A variety of low-current, brush-type DC motors, or longerlife, ironless-core DC and BLDC motors with integrated electronics featuring low EMI/RFI, can be specified. A valve system promotes low aerodynamic loss and optimized flow. Oil-less operation allows for uncontaminated flow of the pumped medium. Depending on model, the pump can achieve flow rates to 450 ml/min, continuous vacuum to 500 mbar (15.2 in. Hg), and continuous pressure to 150 mbar (2.2 psig).