- Detectable Gases: 4He, 3He, H2
- Backing Pump Capacity: 250 l/min
- Pumping Speed for Helium: 2.5 l/s
- Utilizes DN 25 ISO-KF Inlet Flange
The Pfeiffer ASM 340 Wet Leak Detector is a high performance and very easy operation. Pfeiffer ASM 340 Wet guarantees high performance in a vacuum and sniffing leak detection. Adixen ASM 340W has various applications in small production environments for maintenance. The ASM 340-W has an effective pumping system and is available in two different versions dry or conventional. ASM 340 Wet is ultra-fast response time, short recovery time, easy operation. Pfeiffer ASM 340 W is the ideal solution for testing every day.
The Pfeiffer Adixen ASM 340 Wet is a fully automatic, multi-purpose, compact tabletop helium/hydrogen wet (oil-lubricated pump) leak detector. The product consists of a Pfeiffer hybrid turbomolecular drag high-vacuum pump and a large integrated 11 CFM rotary vane roughing/backing pump. It is ideally suited for rapid repetitive and non-repetitive sequential testing applications requiring high-performance operation for both inboard vacuum testing and outboard sniffer testing.

This ASM 340 Wet system, as well as all other Pfeiffer Adixen helium leak detectors, is fully protected against power failure, air in-rushes, and incorrect operations/user error. Access to the 24-hour extended support program (ESP) is fully included and readily available to the user.
Leak detection utilizing helium has a complex history dating back to the first half of the twentieth century and is used in a variety of processes and industries. Helium is used as the preferred tracer gas for eliminating leaks for a variety of reasons, including its non-flammability, non-toxicity, and inexpensiveness relative to other gases. Likewise, its inert state and small atomic size (helium has an atomic mass unit of 4 - second only to hydrogen, which has an AMU of 2) allows the gas to pass through leaks with ease. Unlike hydrogen however, helium is stable and non-explosive, providing a better alternative to be used in leak detection processes.
Utilizing the beneficial qualities of helium, a Helium Leak Detector pumps molecules of the gas into the device's analyzer cell through the use of vacuum pumps. The analyzer cell works on the principle of mass spectroscopy and measures the gas's partial pressure, displayed on the device's spectrometer. A higher reading indicates that a leak may be present, as represented by the quantity and concentration of helium molecules that have passed through a given space, as analyzed by the device. The leak detector converts this partial pressure of molecules into a flow rate. Helium leak detectors are known to be extremely precise and exhibit unparalleled accuracy in detecting leaks.


Click Here for Pfeiffer/Adixen ASM 340 ASM340 ASM-340 W Operating
A&J Vacuum Services offers full repair/service of Pfeiffer Adixen 340W (Wet Version) Helium Leak Detectors, along with all other brands of helium leak detectors offered on our website. AJVS also services Pfeiffer turbo pumps and rotary vane pumps. Please contact us for information about our service and repair program or click http://www.ajvs.com/service.php to access our services page. We also offer emergency service upon request. For more information, please email A&J Vacuum Services at info@ajvs.com or call (973) 249-0854. Thank you for choosing AJVS as your supplier.
| Backing Pump Capacity | 15 m³/h | 8.83 cfm | 250 l/min |
| Detectable Gases | 4He, 3He, H2 |
| Dimensions (L x W x H) | 547 x 375 x 393 mm | 21.54 x 14.76 x 15.47 inch |
| Flange Model (Inlet) | DN 25 ISO-KF |
| I/O Interfaces | Configurable 37 Pins I/O |
| Minimum Detectable Leak Rate for Helium (Sniffing Leak Detection) | 5 * 10^[-10] Pa m³/s | 3.75 * 10^[-9] Torr l/s | 5 * 10^[-9] mbar l/s |
| Minimum Detectable Leak Rate for Helium (Vacuum Leak Detection) | 5 * 10^[-13] Pa m³/s |
| Noise Level | 54 dB(A) |
| Operating Temperature (Hard Vacuum Test) | 0 – 45 °C |
| Operating Temperature (Sniffing Test) | 0 – 35 °C |
| Power Consumption Max. | 850 W |
| Protection Category | IP20 |
| Pumping Speed for He | 2.5 l/s |
| Sound Pressure Level | 54 dB(A) |
| Start-Up Time (20°C) Without Calibration | ~ 3 min |
| Supply | 110 – 130 V, 50/60 Hz |
| Test Method | Vacuum and Sniffing Leak Detection |
| Warranty: Year(s) | 2 |
| Weight | 56 kg | 123.46 lb |
Click Here for Pfeiffer/Adixen ASM 340 ASM340 ASM-340 W Operating
A&J Vacuum Services offers full repair/service of Pfeiffer Adixen 340 W (Wet Version) Helium Leak Detectors, along with all other brands of helium leak detectors offered on our website. AJVS also services Pfeiffer turbo pumps and rotary vane pumps. Please contact us for information about our service and repair program or click http://www.ajvs.com/service.php to access our services page. We also offer emergency service upon request. For more information, please email A&J Vacuum Services at info@ajvs.com or call (973) 249-0854. Thank you for choosing AJVS as your supplier.
We can have a repair estimate ready for your equipment within the hour of submission.
Start your equipment repair process by creating a Service RMA.
A&J Vacuum Services provides repairs on all types of High Vacuum equipment. We perform Turbomolecular Pump repair, Turbo Pump Repair, Dry Pump repair, Vacuum Pump repair and Mass Spectrometer repair. Our highly trained technicians will deliver the highest quality service and satisfaction.
We operate at our own full service repair facility which allows us to quickly and economically perform all repairs in a timely manner. Our advandced machinery enables us to handle all facets of the service and repair process. AJVS utilizes industry standard vibration analysis equipment and advanced testing equipment to troubleshoot and minimize all equipment failures. Our in-house machine shop is capable of machining various components, prototypes and housing conversions as needed.