VARIO®-SP chemistry diaphragm pump MD 1C VARIO-SP


VACUUBRAND20696110ca. 175 mmca. 143 mmca. 4.2 kg20696110

The three-stage MD 1 VARIO-SP diaphragm pump with its variable speed drive system attains significantly higher pumping speed and a better ultimate vacuum than the corresponding fixed speed pump. The brushless 24V DC motor (maintenance-free) enables easy integration of the pump into other equipment and operation independent of line voltage. The pump is particularly silent and vibration-free, and has an outstanding lifetime of its diaphragms and valves. For exceptional chemical resistance of the pump´s internal flowpath it is also available as a chemistry design version (MD 1C VARIO-SP).

Performance features

  • contamination-free pumping and evacuation
  • high flow rate even near ultimate vacuum
  • VARIO®-SP = variable speed: Fast pump down at high motor speed, maintain vacuum with reduced motor speed
  • very powerful and extremely compact; whisper quiet and ultra-low vibration, especially at low speed
  • MD 1C VARIO-SP in chemistry design, with gas ballast valve and outstanding chemical resistance and superior vapor tolerance


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Technical data

Unit Converter
Technical dataUnit MD 1C VARIO-SP
Number of heads / stages4 / 3
Max. pumping speedm3/h1.8
Max. pumping speedcfm1.1
Ultimate vacuum (abs.)mbar/torr2 / 1.5
Ultim. vac. (abs.) with gas ballastmbar/torr4 / 3
Ambient temperature range (operation)°C10 - 40
Ambient temperature range (storage)°C-10 - 60
Max. back pressure (abs.)bar1.1
Inlet connectionHose nozzle DN 8-10 mm
Outlet connectionHose nozzle DN 8 mm
Rated motor powerkW0.064
Typ. current (<10 mbar, 1500 min-1)A1.5
Motor speed rangemin-1200 - 2400
Protection classIP 20
Dimensions (L x W x H)mm235 x 143 x 175
Noise level at 50 Hz, typ.dBA37
NRTL certificationCanada and the USA
ATEX conformity (only 230V)II 3/- G IIC T3 X Internal Atm. only
Items suppliedPump completely mounted, ready for use, with 2 m cable without plug and with manual.
AccessoriesRubber vacuum tubing DN 8 mm (20686001)

MD 1C VARIO-SP - Pumping speed graph

MD 1C VARIO-SP - Pumping speed graph

MD 1C VARIO-SP - Pump down graph (10 l volume)

MD 1C VARIO-SP - Pump down graph
(10 l volume)

MD 1C VARIO-SP - Dimension sheet

MD 1C VARIO-SP - Dimension sheet

-Technical data are subject to change without notice-

Ordering data

Product nameMains voltage and frequencyPlugOrder no.
MD 1C VARIO-SP 24 V= Open wires 20696110
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