VACUUBRAND MD 4 VARIO Select Diaphragm Pump

Features
This three-stage diaphragm pump is an excellent solution for continuous, oil-free pumping of non-corrosive gases to a vacuum level as deep as 1 mbar. All wetted parts are made of aluminum, stainless steel and carefully selected plastics suitable for a wide range of applications with non-corrosive gases. The MD 4 VARIO select continuously adapts its motor speed to hold the desired vacuum level. That means the pump is whisper-quiet and generates ultra-low vibrations and has high leak tightness. The highly flexible fabric reinforced double FKM diaphragm is ideal for extended operating life. The VARIO design includes the variable speed pump and the VACUU·SELECT 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.

These three-stage diaphragm pumps are an excellent choice for continuous, contamination-free evacuation and pumping of non-aggressive gases at demanding vacuum conditions. They are especially suitable for applications requiring high volume flow in physics and analytics. The low ultimate vacuum makes these an attractive alternative to rotary vane pumps. Typical uses are as backing (roughing) pumps for turbomolecular drag pumps, for degassing of viscous media, as well as for exhaust gas analytics. Additionally, the VARIO model provides vacuum control by precise adjustment of the diaphragm pump´s motor speed to process requirements. Back diffusion of oil or even oil back flow, e.g., into a high vacuum chamber is excluded due to its oil-free operation. For equipment manufacturers customized versions are available. Depending on the application, the demand-responsive motor speed control of VARIO models further extends the long diaphragm life for which VACUUBRAND pumps are well-known. In addition, it provides an even higher pumping speed and enables precise vacuum control.

VACUUBRAND MD 4 VARIO Select Diaphragm Pump Specifications

Max. pumping speed 50 Hz	5.7 m 3/h
Max. pumping speed 60 Hz	3.4 cfm
Ultimate vacuum	1 mbar / 0.75 torr
Number of heads	4
Number of stages	3
Lower ambient temperature (operation)	10 °C
Upper ambient temperature (operation)	40 °C
Lower ambient temperature (storage)	-10 °C
Upper ambient temperature (storage)	60 °C
Max. back pressure (abs.)	1.1 bar
Inlet connection	small flange KF DN 16
Outlet connection	Silencer / G1/4"
Rated motor power	0.53 kW
Protection class IEC 60529	IP 20
Dimension L in mm	325 mm
Dimension B in mm	235 mm
Dimension H in mm	245 mm
Weight	19.1 kg
Noise (sound pressure level) in dBA at 50 Hz or 1500 rpm/62% (VARIO)/1500 rpm (VARIO-SP)/12500 Upm (VACUU·PURE®)	45 dBA
NRTL certification	No
Items supplied	Pump completely mounted, ready for use, with manual.
Rated mains voltage range 1	100-120 V
Mains frequency 1	50-60 Hz
Interface	Ethernet (RJ45): Modbus TCP / USB (Type A): Data transfer, software update, RS-232 (additional adapter required)

Comparison of Models

Specs	MD 1 Diaphragm Pump	MD 1C Chemistry Diaphragm Pump	MD 4 NT Diaphragm Pump	MD 4 VARIO Select Diaphragm Pump	MD 4C NT Chemistry Diaphragm Pump	MD 4C VARIO Select Chemistry Diaphragm Pump	MD 12 NT Diaphragm Pump
Max. Pumping Speed 50 Hz	1.2 m³/h	1.3 m³/h	3.8 m³/h	5.7 m³/h	3.4 m³/h	4.6 m³/h	12.1 m³/h
Ultimate Vacuum	1.5 mbar / 1.1 torr	2 mbar / 1.5 torr	1 mbar / 0.75 torr	1 mbar / 0.75 torr	1.5 mbar / 1.1 torr	1.5 mbar / 1.1 torr	2 mbar / 1.5 torr
Number of Heads	4	4	4	4	4	4	8
Vacuum Controller	N/A	N/A	N/A	VACUU·SELECT	N/A	VACUU·SELECT	N/A
Rated Motor Power	0.08 kW	0.08 kW	0.25 kW	0.53 kW	0.25 kW	0.53 kW	0.53 kW
Weight	7.3 kg	7.9 kg	16.4 kg	19.1 kg	14.3 kg	16.8 kg	30.3 kg
Noise Level	40 dBA	41 dBA	45 dBA	45 dBA	45 dBA	43 dBA	50 dBA
NRTL Certification	Yes	Yes	Yes	No	Yes	No	No
Mains Voltage Range	220-230 V / 100-115 V / 120 V	220-230 V / 100-115 V / 120 V	100-115 V / 120 V	100-120 V	100-115 V / 120 V	100-120 V	100-120 V

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