Flow rate (at atm. pressure)

Up to




Down to


mbar abs.


Up to


bar g

KNF N 922 ST - Process Pump
Upgraded with Stainless-Steel Pump Heads

Offering a 40% increase in flow rate compared to its predecessors, KNF N 922 ST is the latest expansion to its series. Equipped with the new stainless-steel pump heads, this robust, highly gas-tight vacuum pump is now suitable for a broader spectrum of applications.

Maintenance without Disassembly

Easy servicing remains the first priority while developing the N 922 ST series. Few replacement parts, long maintenance intervals, and low inspection costs make the N922 ST ideal for use in gas sampling and emission monitoring instruments.

Depending on the application, the maintenance only needs to be performed once a year. Thanks to the durable design, the whole process can be carried out using a standard tool.

Model Comparison
IP 20Single-phase ACFrom 100 – 120 V at 50/60 Hz
to 200 – 240 V at 50/60 Hz 
Comes with a mounting plate with a flexible bore pattern
IP 54Single-phase AC with a terminal box100 – 120 V at 50/60 Hz230 V
at 50 Hz220 V at 60 Hz
Condensate optimization*
IP 54Three phase AC230/400 V at 50/60 Hz Condensate optimization*
Dynamically adjustable performance**

* For optimal condensate, the compressor housing in IP 54 models can be repositioned in increments of 90° separately from the motor.

** IP 54 models with a three-phase AC motor can be operated with a frequency converter, making the pump performance dynamically adjustable according to specific requirements.

See also KNF N 922 STE Ex for explsion-proof models. For any question, please contact us.

  • Flow rate l/min at atm. pressure25
    Ultimate vacuum mbar abs.110
    Operating pressure bar g6
    Permissible media temperature °C0° to +60°C
    Permissible ambient temperature °C+5° to +60°C; 0° if frost-free (non-condensing)
    Motor protectionIP 54 / IP 20
    • Pump head: stainless steel
    • Diaphragm: PTFE-coated/EPDM
    • Valves: stainless steel

Related Products

More products available on the category page:

Process Vacuum Pumps and Compressors


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