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A collection of technical articles on diaphragm pumps

Pump Series (Link to Databook)	Available Motors	Flow Rate LPM	Flow Rate CFM	Max Vacuum absolute	Max Pressure psig
DATABOOK (PDF:507kb/6pgs)documents the following group of pumps:
UN84.3	AC/DC/BLDC	5	0.18	7 mbar/5.2 Torr	4.5
UN84.4	AC/DC/BLDC	4.8	0.18	2 mbar/1.5 Torr	4.5
UN813.3	AC/BLDC	13	0.46	3 mbar/2.35 Torr	15
UN813.4	AC/BLDC	13	0.47	<.5 mbar/.375 Torr	15
UN813.5	AC/BLDC	19	0.7	<1 mbar/.75 Torr	15
N880	AC	80	2.82	2 mbar/1.5 Torr	15
N920 (PDF:900kb/1pg)	AC/DC/BLDC	21	0.74	1.5 mbar/1.125 Torr	7.3
N940.5AP (PDF:900kb/1pg)	AC/DC/BLDC	50	1.8	1.5 mbar/1.125 Torr	7.3
N940.5TT (Full PTFE)(PDF:620kb/4pg)	AC/BLDC	50	1.8	2 mbar/1.5 Torr	7.3
N950.50 (PDF:1.2b/4pg)	AC/BLDC	55	1.8	2 mbar/1.5 Torr	7.3
Motor Key: AC=Alternating Current, DC=Brush DC, BLDC=Brushless DC. (a) Absolute

	Higher Flow Performance at Low Vacuum Levels Engineers have developed a way to get the best of both worlds – high flow rates and deep vacuums with a lightweight, multi-headed diaphragm pump. This significantly reduces system size, weight, and cost while improving performance. Max flow is 50 l/m max vacuum is <2 mbar absolute vailable with either a 24VDC Brushless or a worldwide 100-240VAC, 50-60 Hz motor. Only 14 lbs (6.5kg), 29L x 12H x 19W cm The motor has been designed and produced by KNF to assure a variety of customer input (power and signal types) and motor output (torque, noise, & balance) to completely match the pumps’ loading requirement. The liquid tolerant design handles condensable media. Options include: Speed Control through external signal input, gas ballast, remote on/off operation, signal output for speed monitoring It is ideal for roughing & backing turbomolecular pumps, vacuum ovens and concentrators, chemiluminescence detectors, leak detectors, and more, including replacing piston or other pump types.
	High Flow Performance at Low Vacuum Levels KNF's new N920 series pump features excellent pumping speed at low vacuum levels. Interconnections are an integral part of the three-stage head and improve leak-tightness. Input power features a universal (90-264VAC, 50-60Hz) AC input or a speed-controlled brushless-DC motor. It is gas tight to 6x10-3 mbar x l/s specifications.
	Excellent Pumping Speed at Low Vacuum Levels KNF's new N940 series pump is now available in a PTFE/PVDF corrosion-resistant version for use in analytical, process and and features excellent pumping speed at low vacuum levels using KNF's diaphragm stabilization system. Input power is an IP-54 AC motor. Show at left is model N940.5TTI
	Performance Response to Logic Controller Demand KNF's Model UN813.4ANI pump shown with a logic and speed-controlled, brushless DC motor generates <0.5 mbar (<0.375Torr) of dry, oil-free vacuum using only four heads. These pumps represent our latest innovations, including logic-controlled speed controls.

Unit Conversion Tools: Chemical Resistance Chart:

NOTES: Standard continuous performance ratings listed on this KNF website and on KNF datasheets are based on technical data and test results of nominal units at sea level, measured with an ambient temperature of 70°F (21°C), and nominal electrical supply as listed above, and are for reference only.Multiple-head models, different performance models, cost-effective OEM modifications, and a variety of motor options and different materials of construction are also available. Certified drawings are available upon request. Specifications subject to change without notice. You should always check corrosion resistance charts for compatibility with the medium you intend to pump.

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