In many industries, environmental engineering and research, high-performance, durable and reliable diaphragm vacuum pumps are widely sought whether for evacuating, transferring or compressing functions. The N 922 pump series from KNF fits the bill. This pump series is available with stainless steel or modified PTFE pump heads, making it suitable for a wide range of applications.

Features & Benefits

What makes each version of the N 922 gas pump series stand out and how they differ from each other? Here are the advantages:

PTFE Pump Head

PTFE Pump Head, integrated Bypass Valve

Stainless Steel Pump Head, Protection Class IP 20

Stainless Steel Pump Head, Protection Class IP 54

  • High chemical resistance
  • Robust design
  • Easy to sercive – wearing parts are inexpensively to replace
  • Maintenance work can be easily carried out even on assembled analytical systems
  • Durable even with difficult operating conditions
PTFE Pump Head
  • High chemical resistance
  • Robust design
  • Easy to sercive – wearing parts are inexpensively to replace
  • Maintenance work can be easily carried out even on assembled analytical systems
  • Durable even with difficult operating conditions
PTFE Pump Head, integrated Bypass Valve
  • High operating pressure of max. 6 bar rel.
  • High level of gas tightness: 6 x 10-3 mbar x l/s according to type examination
  • Base plate enables simple and quick assembly
  • Versatile in a broad pressure and vacuum range
  • Can be used for media and ambient temperatures of up to +60 °C
Stainless Steel Pump Head, Protection Class IP 20
  • High operating pressure of max. 6 bar rel.
  • High level of gas tightness: 6 x 10-3 mbar x l/s according to type examination
  • Dynamically adjustable to the customers' system by using the three-phase motor in combination with a frequency converter 
  • Can be used for media and ambient temperatures of up to +60 °C
  • Compressor housing can be turned in 90° intervals as required
Stainless Steel Pump Head, Protection Class IP 54

Gas Sampling Pumps in Emission Measurement Technology

Robust, durable, easy-to-service: process gas measurement technology and analytical measuring devices used for environmental protection and facility management must continually deliver accurate measurements. They are often used in challenging ambient conditions. Their carefully designed components make KNF diaphragm gas pumps ideal for these demanding applications, because the reliable operation of diaphragm pumps used in key positions for gas analysis, emission measurement and process manufacturing can make all the difference.

 

The N 922 oil-free gas pump series transfers media reliably and with low maintenance requirements and is available in Ex and non-Ex versions. High leak-tightness as well as high performance values concerning flow rate, ultimate vacuum and operating pressure are making this pump series particularly convenient for stationary emission measurement or any other demanding industrial process.

Get an Overview of our Gas Sampling Pumps in Emission Measurement Technology

At our live webinar at ACHEMA Pulse 2021 Felix Ullrich, Area Sales Manager North Germany at KNF, spoke about "Overcome typical obstacles of valid extractive gas analysis with flexible gas sampling pumps".

The focus on the webinar is about the following: 
Constant sample air volume and uncontaminated samples are the prerequisites of valid extractive gas analysis. However, these are influenced by the process related requirements in regard to the employed measurement technology, the characteristics of sample gases as well as the aging of gas sampling pumps. Based on the experience from an installed basis of thousands of gas sampling pumps for emission analysis and process control, we use this presentation to highlight why specifically the flexibility of gas sampling pumps is key to overcoming these obstacles.
We focuse on enhanced dynamics of gas sampling pumps by means of integrating them into the process control systems and, on the other hand, targeting the design of the pump components at the requirements of the respective process technology.
Overcome typical obstacles of valid extractive gas analysis with flexible gas sampling pumps - Webinar at ACHEMA Pulse 2021
- How to deal with condensate in the Ex-area?
- How to handle process-related changes to pressure conditions in gas sampling tubes?
- How to master highly reactive and aggressive gases?
- How can a constant gas flow with gas sampling pumps be ensured even with special conditions?
Gas Sampling Pumps in Process and Emission Monitoring Systems - Joint Webinar by AGT-PSG and KNF
Where to use diaphragm pumps to be crucial for processing media
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Possible Areas of Use

The properties of the process gases, as well as the location and the ambient conditions, can place high requirements on stationary emission measurement and monitoring systems.

Read more about KNF pumps in industrial processes here

Easy to service

Owing to the long service life of stationary emission measurement systems, the ease of servicing built-in components is an important feature. The N 922 gas pump series fulfills this need in every regard. The only parts which have to be replaced are the diaphragm and valves. This task must be performed once a year depending on how the pump is used. Maintenance work can be easily carried out even on assembled analytical systems using standard tools. Thanks to its robust design, there is no need to remove the pump series for servicing, thus ensuring that the measurement technology remains ready for operation even under extreme conditions. Few replacement parts, long periods between required maintenance work and low costs for spare parts all add up to pleasingly low operating costs.

 

The compressor housing of the N 922 gas pump series can be moved in increments of 90 degrees separately from the motor in order to be positioned as required for condensate discharge.

How to Maintenance and to How to Turn the Compressor Housing

How to service the N 922 gas pump series with PTFE pump head
Condensate discharge by turning the compressor housing in 90 degree steps
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The Right Fit for Your Need

The N 922 is available in four variants: either with an modified PTFE head or stainless steel head and with or without an integrated bypass valve, as with proctection class IP 20 or IP 54.

 

Familiarize yourself with the technical details of our N 922 gas pump series:

PTFE Pump Head

PTFE Pump Head, integrated Bypass Valve

Stainless Steel Pump Head, Protection Class IP 20

Stainless Steel Pump Head, Proctection Class IP 54

­­Flow Rate (max.): 18 l/min

Operating Pressure (max.): 1.5 bar (rel.)

Ultimate Vacuum (max.): 200 mbar (abs.)

Get all technical details here
PTFE Pump Head

Flow Rate (max.): 18 l/min

Operating Pressure (max.): 1.5 bar (rel.)

Ultimate Vacuum (max.): 200 mbar (abs.)

Get all technical details here
PTFE Pump Head, integrated Bypass Valve

Flow Rate (max.): 25 l/min

Operating Pressure (max.): 6 bar (rel.)

Ultimate Vacuum (max.): 110 mbar (abs.)

Get all technical details here
Stainless Steel Pump Head, Protection Class IP 20

Flow Rate (max.): 25 l/min

Operating Pressure (max.): 6 bar (rel.)

Ultimate Vacuum (max.): 110 mbar (abs.)

Get all technical details here
Stainless Steel Pump Head, Proctection Class IP 54

Modular System Options

Every application is different and some are one of a kind. By selecting and combining a variety of options, ranging from the material used to make the pump components that come into contact with the media, to the drive and the mechanical elements such as the circuit point and connections, it is easy to tailor every series model to meet application-specific requirements. 

The following pump parts of the N 922 gas pump series can be customized by our modular system: 

Pump head
Diaphragm
Valves
Motor
Pump head
▪  Modified PTFE
▪  Stainless steel
Diaphragm
▪  PTFE-coated­
▪  EPDM
Valves
▪  FFPM
▪  Stainless steel­
Motor
▪  Capacitor motor with 230 V, 50 Hz
▪  Capacitor motor with 100 V, 50/60 Hz
▪  Capacitor motor with 115 V, 60 Hz
▪  Capacitor motor with 220 V, 60 HZ
▪  Three-phase motor with 230/400 V, 50/60 Hz

Let Us Know Your Specifications!

We implement your specifications carefully and precisely. This means you get a diaphragm pump that meets the requirements of your process, your operating conditions and the properties of the process medium. We would also be happy to discuss options for providing out a sample pump.
Contact us

Learn More About our Explosion-Proof Versions

Familiarize yourself with the N 922 Ex pump series

Get all information here

Further Videos

Flexible support from start to finish – your added value is our priority
KNF modular system exemplified by the N 816 diaphragm vacuum pump
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KNF Pumps: Reliable and Safe Where it Matters Most

From sample gas pumps for analyzing process gases to emissions monitoring, the transfer of highly explosive media and the recovery of valuable gases, KNF’s solutions are used wherever it is crucial for processing media to be handled with special care. When it comes to implementing KNF diaphragm pumps that are tailored precisely to your process and operating conditions, your specifications set the benchmark right down to the smallest detail.

For more information about our most recent innovations for gas analysis, emission measurement and industrial processes, please feel free to have a look on our application page.

KNF Modular System

Flexible, custom-fit, cost-effective – from standard to high-end

Every application is different and some are one of a kind. Our modular system is designed to give you a high degree of flexibility, speed and reliability. You can be sure that every gas and liquid pump supplied by KNF will exactly meet your requirements, no matter how complex or unusual these might be. 

Learn more

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