Pfeiffer Vacuum ASM 340 Portable Helium Mass Spectrometer Leak Detector
| Brand | Pfeiffer Vacuum |
|---|---|
| Origin | Germany |
| Model | ASM 340 |
| Instrument Type | Portable |
| Detection Method | Vacuum Mode |
| Minimum Detectable Leak Rate | 5 × 10⁻¹³ Pa·m³/s |
| Startup Time | 3 min |
| Response Time | < 1 s |
| Maximum Inlet Pressure | 2500 Pa |
| Helium Purge Speed | 2.5 L/s |
| Leak Rate Display Range | 1 × 10⁻³ to 1 × 10⁻¹³ Pa·m³/s |
Overview
The Pfeiffer Vacuum ASM 340 is a high-sensitivity, portable helium mass spectrometer leak detector engineered for precision vacuum integrity verification in demanding industrial, R&D, and quality assurance environments. Based on quadrupole mass spectrometry with optimized ion optics and a high-transmission magnetic sector-free analyzer, the ASM 340 detects helium tracer gas (⁴He⁺) at partial pressures down to 5 × 10⁻¹³ Pa·m³/s—enabling quantitative identification of ultra-fine leaks in sealed systems such as semiconductor process chambers, vacuum furnaces, cryogenic vessels, aerospace components, and medical device packaging. Its vacuum-mode operation requires connection to an external roughing pump (not included), and the instrument operates under differential pumping architecture to maintain optimal mass filter resolution while tolerating inlet pressures up to 2500 Pa—eliminating the need for inline throttling valves in many field applications.
Key Features
- True portable design with integrated handle, ruggedized housing, and low power consumption (24 V DC or optional AC adapter), enabling on-site leak localization without system disassembly
- Fast startup sequence (< 3 minutes from cold start) and sub-second response time (< 1 s) for real-time leak signal tracking during sniffer probe scanning
- Wide dynamic leak rate display range spanning ten decades (1 × 10⁻³ to 1 × 10⁻¹³ Pa·m³/s), calibrated per ISO 20484:2017 and traceable to national metrology institutes
- Dedicated helium purge system with 2.5 L/s effective pumping speed at the analyzer inlet, minimizing background interference and enabling rapid recovery after high-helium exposure
- Robust quadrupole mass filter with auto-tuning algorithm, temperature-stabilized electronics, and long-life filament assembly designed for > 10,000 hours of operational duty cycle
- Integrated digital I/O interface (RS-232, USB, and optional Ethernet) supporting remote control, data logging, and integration into automated test stations
Sample Compatibility & Compliance
The ASM 340 is compatible with all standard helium spray probes (e.g., Pfeiffer VPX series), vacuum chamber connections (KF-40, CF-63), and custom manifold interfaces. It supports both stationary vacuum-integrated testing (e.g., chamber evacuation + helium spraying) and mobile sniffing mode for pressurized systems. The instrument complies with IEC 61000-6-3 (EMC emissions), IEC 61000-6-2 (immunity), and meets CE marking requirements for electromagnetic compatibility and low-voltage safety. Its calibration methodology adheres to ISO 9001–certified internal procedures aligned with ASTM E493 and ISO 20484 standards for helium leak testing performance validation. For regulated industries, audit-ready operation logs—including timestamped leak events, operator ID, and environmental sensor readings (optional)—can be configured to meet GLP/GMP documentation expectations.
Software & Data Management
The ASM 340 ships with Pfeiffer’s proprietary LeakTest Control software (Windows-based), providing intuitive configuration of measurement parameters, real-time spectral visualization, multi-curve overlay, and customizable pass/fail thresholds. All measurements are stored in .csv and .xml formats with embedded metadata (date/time, instrument ID, calibration status, ambient temperature/pressure). The software supports FDA 21 CFR Part 11–compliant user authentication, electronic signatures, and immutable audit trails when deployed in validated environments. Optional OPC UA server integration enables seamless connectivity with SCADA, MES, and LabVantage platforms for centralized QA/QC reporting.
Applications
- Leak validation of high-vacuum and ultra-high-vacuum (UHV) systems in semiconductor lithography tools and thin-film deposition chambers
- In-process inspection of hermetically sealed MEMS sensors, laser diodes, and optical enclosures
- Final acceptance testing of vacuum-insulated panels (VIPs), cryogenic storage dewars, and fusion reactor diagnostic ports
- Regulatory compliance testing for ISO 11607–qualified medical device packaging and implantable electronics housings
- Field service diagnostics of HVAC chillers, refrigeration circuits, and fuel cell stacks using pressurized helium tracer methods
FAQ
What vacuum roughing pump is required for ASM 340 operation?
A two-stage rotary vane pump capable of achieving ≤ 10 Pa base pressure and delivering ≥ 10 m³/h pumping speed is recommended; Pfeiffer’s DUO series (e.g., DUO 0.8 A) is commonly paired.
Can the ASM 340 detect gases other than helium?
No—the quadrupole mass filter is factory-tuned exclusively for m/z = 4 (⁴He⁺); it does not support multi-gas analysis or residual gas analysis (RGA) functionality.
Is calibration certificate included with shipment?
Yes—a factory calibration report (traceable to PTB, Germany) is provided, covering sensitivity, linearity, and zero stability across the full leak rate range.
Does the ASM 340 support automated test sequences?
Yes—via LeakTest Control software scripting or external PLC trigger signals through digital I/O, enabling unattended batch testing with configurable dwell times and pass/fail logic.
What maintenance intervals are recommended?
Filament replacement every 2–3 years under typical usage; annual verification of mass filter tuning and leak rate calibration is advised for ISO/IEC 17025–accredited labs.
