N 922 Ex Pump Series

High Performance, Easy Servicing

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. Also when processes use explosive media. Therefore KNF has developed the explosion-proof pump series N 922 Ex with modified PTFE or stainless steel pump heads, making this pump series suitable for a wide range of applications.

Features & Benefits

What makes each version of the N 922 Ex 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

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
Motor approved in accordance with ATEX/IECEx
Explosion protection pump parts: Ex II 2G Ex h IIB+H2 T3 Gb
Explosion protection capacitor motor: Ex II 2G Ex de IIC T4

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
Motor approved in accordance with ATEX/IECEx
Explosion protection pump parts: Ex II 2G Ex h IIB+H2 T3 Gb
Explosion protection capacitor motor: Ex II 2G Ex de IIC T4

Motor approved in accordance with ATEX/IECEx
High level of gas tightness: 6 x 10^-3 mbar x l/s according to type examination
Durable even with difficult operating conditions
Compressor housing can be turned in 90° intervals as required
Explosion protection pump parts: Ex II 2/2G Ex h IIB+H2 T3 Gb
Explosion protection motor: Ex II 2G Ex de IIC T4

Get an Overview of our Explosion-proof 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

Possible Areas of Use

Consistently accurate results are essential in process gas measurement technology and in analytical measuring devices used for environmental protection and facility management. Their meticulously designed components make KNF pumps ideal for these demanding applications.

Easy service and optimal drainage of condensate

How to maintain the KNF N 922 STE gas pump series with stainless steel pump head

How to service the N 922 gas pump series with PTFE pump head

Condensate discharge by turning the compressor housing in 90 degree steps

Changing the throttle valve of the N 922 gas pump series as a .29 Version

The Right Fit for Your Need

The N 922 Ex is available as PTFE version with integrated AC supply or with adjustable flow and integrated AC supply, as well as stainless steel version with integrated AC supply.

Familiarize yourself with the technical details of our N 922 Ex explosion-proof pump series:

PTFE Pump Head

PTFE Pump Head, integrated Bypass Valve

Stainless Steel 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

Flow Rate (max.): 18 l/min

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

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

Get all technical details here

Flow Rate (max.): 23 l/min

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

Ultimate Vacuum (max.): 2.5 mbar (abs.)

Get all technical details here

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 Ex explosion-proof pump series can be customized by our modular system:

Pump head

Diaphragm

Valves

Motor

Pump head

▪ Modified PTFE
▪ Stainless steel

Diaphragm

▪ PTFE-coated

Valves

▪ FFPM
▪ Stainless steel

Motor

▪  Capacitor motor with 230 V, 50 Hz
▪  Capacitor motor with 100 V, 50/60 Hz
▪  Capacitor motor with 220 V, 60 Hz
▪  Capacitor motor with 230 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.

Learn More About our Non-Ex Versions

Familiarize yourself with the N 922 non-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

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