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Welch 2047B-01 Diaphragm Pump | Dryfast Chemical Duty Pump

Welch® DryFast® diaphragm pumps are designed for harsh chemical duty processes and stand above the competition in performance. Welch® DryFast® vacuum pump provide tunable control, precisely within 1 Torr. The Welch® DryFast chemical duty pump is lightweight, with a control knob ergonomically easy to use, front and center of the pump. The Welch 2047 is an excellent multiple nozzle vacuum pump and successfully employed in mini vacuum networks.

Welch® improves dry vacuum pump technology with the new DRYFAST® having built-in Advanced Vapor Management (AVM). AVM means precise control capability for the distillation of organic solvents and applications handling aggressive vapors and gases.

Constructed with solid PTFE heads, PTFE diaphragms, Kalrez® valves and utilizing fluorinated plastics on all wetted surfaces, these dry vacuum pumps are designed to meet your ever-challenging chemical duty laboratory needs.

The Welch 2047B-01 features flows of 70 l/min and ultimate vacuum levels down to 2-Torr. No cold traps are needed to operate.

These stand-alone vacuum pumps need very little maintenance leading to low cost of ownership and improved productivity.
Welch® application certifies DRYFAST® and DRYFAST ULTRA® for

Note: Due to Government Regulations, we will not export this product outside the US unless an end-user certification is in place.

Welch Diaphragm Pump Model 2067B-01 Range of Applications:

  • Rotary evaporation
  • Concentrators
  • Evaporators
  • Vacuum ovens
  • Filtration
  • Degassing, and other chemical applications.


Advanced Vapor Management (AVM)
• Vacuum to 2-torr (2.6 mbar, 266 Pa)

  • Strips DMF fast*
  • 2.5 CFM
  • Ideal for Buchner Funnel Filtration Systems
  • Chemically resistant
  • Oil-free operation
What’s included US standard plug
Common accessory, not included Inlet / Exhaust Separator Jars, 1423B
Pumping Speed 70 l/min
Max. Vacuum 35 torr
Tubing Needed 1/4″ ID
Exhaust / Intake threads M14(1/8)
Dimensions LxWxH 13.8×6.8×8.8″
Weight 21.25 lbs
Wiring 115V, 60 hz

Use this resource to help determine the pumping speed you need. Got questions about which Vacuum Pump or Vacuum Controller is best for your particular application? Contact our technical sales team.


User Manual

For more documentation, please visit DigiVac’s folder.

Technical Specifications

Power 100-120V or 200-230V switchable
Displacement 50 or 60Hz
Peak pumping speed 50 or 60Hz
60 m3h-1 / 35 ft3min-1
40 m3h-1 / 23.5 ft3min-1
Ultimate vacuum (Total pressure) 5 x 10-2 mbar / 4 x 10-2 Torr
Max continuous inlet pressure 40 mbar / 30 Torr
Max continuous outlet pressure 0.2 bar gauge / 2.9 psig
Max allowed inlet and GB pressure 0.5 bar gauge / 7 psig
Motor power 0.52kW
Power connector IEC EN60320 C19
Nominal rotation speed 1750 rpm
Weight 48 kg / 105 lb
Inlet / exhaust flange NW40 / NW25
Noise and vibration level 55.4 dB (A), <4.5mms -1 (rms)
Leak tightness (static) <1 x 10-6 mbar ls-1
Operating temperature range 10 to 40 °C / 50 to 104 °F
Compliance UL, CE, ATEX

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