VARIO® diaphragm pump MD 4 NT VARIO

MD 4 NT VARIO

These three-stage diaphragm pumps are an excellent solution for continuous, oil-free pumping of non-corrosive gases. They reach an excellent ultimate vacuum of 1 mbar. All parts in contact with pumped gases and vapors are made of aluminum, stainless steel and carefully selected plastics suitable for a wide range of applications with non-corrosive gases. The new NT series provides whisper quiet and ultra-low vibration operation, high leak tightness and improved performance. The highly flexible fabric-reinforced double diaphragm made of FKM is ideal for extended operating life. The VARIO^® design includes the VARIO^® pump and the CVC 3000 vacuum controller with external gauge head. The demand-responsive motor speed control on VARIO^® models further extends the already long lifetimes of diaphragms and valves.

Performance features

contamination-free pumping and evacuation
high flow rate even near ultimate vacuum
VARIO^® option for self-regulating vacuum optimization throughout the process
excellent ultimate vacuum, VARIO^® version with higher pumping speed and TURBO·MODE^TM for use as backing pump for turbo pumps
CVC 3000 controller on VARIO^® version offers easy operation with clear text menus

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Technical data

Technical data	Unit	MD 4 NT VARIO
Vacuum controller		CVC 3000
Number of heads / stages		4 / 3
Max. pumping speed	m3/h	5.7
Max. pumping speed	cfm	3.4
Ultimate vacuum (abs.)	mbar/torr	1 / 0.75
Ambient temperature range (operation)	°C	10 - 40
Ambient temperature range (storage)	°C	-10 - 60
Max. back pressure (abs.)	bar	1.1
Inlet connection		Small flange KF DN 16
Outlet connection		Silencer / G1/4"
Rated motor power	kW	0.53
Motor speed range	min-1	30 - 2400
Degree of protection		IP 20
Dimensions (L x W x H)	mm	325 x 235 x 245
Weight	kg	18.6
Noise level at 50 Hz, typ.	dBA	45
ATEX conformity (only 230V)		II 3G IIC T3 X Internal Atm. only
Items supplied		Pump completely mounted, ready for use, with manual.
Accessories		Stainless steel tubing KF DN 16 (1000 mm: 673336) Vent valve VBM-B (674217)

MD 4 NT VARIO - Pumping speed graph

MD 4 NT VARIO - Pump down graph (10 l volume)

-Technical data are subject to change without notice-

Ordering data

Product name	Mains voltage and frequency	Plug	Order no.
MD 4 NT VARIO	200-230 V~ 50-60 Hz	CEE	736300
	200-230 V~ 50-60 Hz	CH, CN	736301
	100-120 V~ 50-60 Hz	US	736303

Product comparison



Diaphragm pumpMD 1	-	1.5	-	1.2	1.4	-	-	-	-	-	-	-	-	-	-
Diaphragm pumpMD 4 NT	-	1	-	3.8	4.3	-	-	-	-	-	-	-	-	-	-
VARIO® diaphragm pumpMD 4 NT VARIO	-	1	-	5.7	5.7	-	-	-	-	-	-	-			-
Diaphragm pumpMD 12 NT	-	2	-	12.1	13.3	-	-	-	-	-	-	-	-	-	-
VARIO® MembranpumpeMD 12 NT VARIO	-	1.5	-	13.4	13.4	-	-	-	-	-	-	-			-