MAG084
Magnetic field resistant cold cathode passive gauge head for VGC094
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Gemini™ MxG5xx
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 |
Specifications
| 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 |
| MAG084 | |
| 399-849 | DN 40 ISO-KF |
| 399-850 | DN 40 CF-F |
| Cables to VGC094 | |
| to MAG084 80°C | |
| BG548406-T | 3 m (9.9 ft) |
| BG548407-T | 6 m (19.8 ft) |
| BG548419-T | 10 m (33 ft) |
| BG548483-T | 15 m (49 ft) |
| to MAG084 250°C | |
| BG548542-T | 3 m (9.9 ft) |
| BG548543-T | 6 m (19.8 ft) |
| BG448045-T | 10 m (33 ft) |
| BG548989-T | 15 m (49 ft) |
