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Ultra Small Residual Gas Analyzer specifically designed for High Pressure operation

The AX-80 Residual Gas Analyzer is fitted with a very small mass filter and has half the ion path length of other Residual Gas Analyzers designed for High Pressure operating. With a mass ranges of 80amu, the AX80 will operate up to 10-2mBar pressure.

The AX-80 Residual Gas Analyzer uses a PC Computer as its system controller and its operating software is written in a high level language. This simplifies updating, and allows easy customizing to meet specific process requirements. The user-friendly software operating under 'Windows' make the AX-80 easy to use in all RGA and gas analysis applications.

Key Benefits

bulletHigh Pressure operation
bulletLow Cost
bulletVery Small Size
bulletSimple to use
bulletComprehensive Software.


< The Analyzer.

The quadrupole analyzer is fitted with a low profile ion source of a radially symmetrical design fitted with twin filaments. The standard filaments are thoria coated iridium but tungsten are available if required. The high precision mass filter is only 12mm long with a pole radius  equivalent to 1 mm.





 ^ Electronic Control Unit

This compact unit contains the complete quadrupole electronics and plugs directly onto the analyzer. Communication with the PC Computer is via the RS232.

The unit has a performance and features only found on more expensive Residual Gas Analyzers, and yet its small size and low cost is achieved by the use of the very latest electronic techniques.


<Micro Mass Filter

Photo of the Micro Mass Filter compared to a 50 pence coin.

 The specially shaped electrodes are equivalent to a circular rod of 1 mm radius, and are 12mm long. The 4 electrodes are supported by a precision machined ceramic collar.



Complete Analyser>

The complete analyser head shown opposite is available with a choice of mounting flange. KF 40 is normally supplied as standard.
The thoria coated iridium filaments are individually replaceable. The analyser can be dis-assembled by the user for cleaning purposes should cleaning be required.




The Analogue Spectra below, show the performance of the AX80 Residual Gas Analyzer. Despite the small size of the micro mass filter, 10% valley resolution is readily achieved between adjacent mass peaks. An air leak was introduced to raise the pressure for illustration purposes.

Software features

The new 'Windows' RGA software for the AX-80 Residual Gas Analyzer mass spectrometer has been designed to be 'user friendly' and very simple to learn and use. For detailed information refer to the separate software leaflet.


Technical Data:- AX80 Residual gas Analyzer.

Mass Range

1-50 or 1-80amu.


10% valley between equal peaks.

Minimum detectable partial pressure

5x10-10mBar Faraday, 

Minimum detectable total pressure

2 x 10-10 mBar.

Maximum operating pressure

1x10-2mBar Faraday,

Electron energy


Ion Energy

4 - 8eV*


300 uA *

Bake-out temperature

250C recommended. 350C maximum

R.F frequency

8Mhz or 10Mhz.

R.F. amplitude

700V p/p at maximum mass

Filter Rod Electrode Radius

Equivalent to 1.0 m.m.

Filter Rod Electrode length

12 m.m. 

Power requirements

24VDC 15-20Watt / 100-240VAC 50-60Hz by separate Power Unit included.

Software features

Refer to separate Software Leaflet.

P.C .Computer required

With 'Windows' installed

I/O 7 Analog inputs & 5 Analogue outputs
Order Information. - AX-80 Residual Gas Analyzer.

Complete Instruments


80amu RGA with Faraday Detector

Complete Instruments


50amu RGA with Faraday Detector

Spare Analyzer Heads


 Analyzer with Faraday Detector

Spare Filaments


Pack of 2 Thoria coated Iridium. Individually replaceable.



Electronics unit 7 x 3.7 x 3.5 inches (178 x 93 x 88mm)

Analyser Flange KF40 or DN40CF




Contact Information

+44 (0)1805 625 205
Postal address
  Anglo Scientific Instruments,
  3, Devon Units, Hatchmoor Industrial Estate,
            Torrington, Devon. EX38 7HP. UK.
Electronic mail

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