Cold Cathode Gauges

MAG084

Magnetic field resistant cold cathode passive gauge head for VGC094

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The gauge head MAG084 is a unique magnetic field resistant inverted magnetron cold cathode gauge designed to operate with the Vacuum Gauge Controller VGC094. Its special design, fitting a double ionization chamber principle, allows vacuum measurement in the pressure range from 1×10^-8 to 5×10^-3 mbar even in presence of strong external magnetic fields.

Thanks to an all-metal design, NdFeB rare earth magnets, the optimised and closed magnetic circuit and the magnetic shielding enclosure, MAG084 is the answer for all special Fusion and R&D applications requiring the highest performance, including magnetic field immunity.

MAG084 has a bake-out temperature up to 230 °C and ionizing radiation resistance up to 10⁷ Gy. The gauge head has an ignition aid mounted on the anode (reducing the cold cathode ignition time at low pressure) and can be easily disassembled and cleaned, allowing long term use with minimal downtime.

Advantages

Developed to sustain operation in strong external magnetic fields
Reliable and proven gauge head design, based on the inverted magnetron principle
Innovative double ionization chamber principle
Bakeable to 230 °C
Good ignition properties
Corrosion resistant with ceramic feedthrough
Radiation resistant design to 1×10⁷ Gy
Easy to maintain, low cost of ownership

Features

Innovative double ionization chamber principle
NdFeB rare earth magnets
Optimised and closed magnetic circuit
Magnetic shielding enclosure

Typical applications

Special Fusion and R&D applications presenting strong external magnetic fields

Operating Units

Vacuum Gauge Controller VGC094

Magnetic field performance

Full tolerance and reversible recovery from short-term external magnetic field exposure up to 600 mT, at 230 °C (any orientation).
Max. operating allowable external magnetic field (3 dB margin) and relatively induced error:

External magnetic field		Induced measurement deviation
Axial	Radial
≤180 mT	≤150 mT	≤10%
≤280 mT	≤180 mT	≤factor 2

Order Information

Product

Accessories

Specifications

MAG084

Measurement principle	Inverted magnetron cold cathode
Measurement range	1×10^-8 ... 5×10^-3 mbar
Accuracy (N₂)	30% of reading
Repeatability (N₂)	5% of reading
Feedthrough \| Internal seal	AI₂O₃ ceramic \| Metal
Bake-out temperature	≤230 °C
Max operating distance	≤100 m
Ionizing radiation tolerance	10⁷ Gy
Magnetic field immunity	see Magnetic field performance
Materials exposed to vacuum	Stainless steel, AI₂O₃, Ag, Mo
Features	Double ionization chamber principle Coax connector

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Datasheets

MAG084 Cold Cathode Gauge

pdf • 116,9 KB • English • Datasheets

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