What is the anode assembly for INFICON MPG400/MPG401? Why is it critical for vacuum gauge refurbishment?

The anode assembly is a key electrical discharge control component designed for INFICON MPG400 and MPG401 cold cathode vacuum gauges. During the gauge refurbishment or repair process, replacing a degraded anode is essential because it operates under a high voltage of 2–4 kV DC to generate the electric field required for gas ionization. Accurate coaxial alignment (≤0.5 mm) and high-purity alumina ceramic insulation are required to maintain field symmetry, prevent electrical breakdown, and ensure stable, reliable vacuum measurements.

What are the technical specifications of the vacuum gauge anode? How does vacuum brazing improve its performance?

The vacuum gauge anode assembly features a hermetic ceramic-to-metal joint achieved through precision metallization and vacuum brazing. This construction delivers a very low leak rate of less than 1 × 10⁻⁹ mbar·L/s, preventing outgassing and protecting system integrity in high vacuum environments. Additionally, the vacuum brazing process ensures excellent high-voltage resistance (2–4 kV DC) and thermal stability, enabling the assembly to withstand continuous electron and ion bombardment during operation.

Vacuum Gauge Anode Assembly INNOVACERA

Vacuum Gauge Anode Assembly

Technical Features

1.Built for high voltage vacuum environments.
2.Precision electrode alignment for stable ionization.
3.High voltage insulation for 2-4 kV DC operation.
4.Vacuum compatible materials for low outgassing conditions.
5.Hermetic ceramic to metal sealing by metallization and vacuum brazing.
6.Excellent electrical stability and long service life.
7.Precision concentricity control for field symmetry.

Why the Anode Assembly Is Critical

The anode assembly is a key electrical discharge control component in cold cathode vacuum gauges. Operating under 2-4 kV DC high voltage, it creates the electric field required for ionization. Precision alignment and insulation stability directly affect measurement accuracy and gauge reliability.

Technical Specifications

Parameter	Specification
Compatible Models	INFICON MPG400 / MPG401
Voltage Resistance	2–4 kV DC
Leak Rate	<1 × 10⁻⁹ mbar·L/s
Joining Process	Ceramic metallization + vacuum brazing
Operating Environment	High vacuum and electron/ion bombardment conditions
Coaxial Accuracy	≤0.5 mm

Applications

– Vacuum Gauge Repair
– Vacuum Gauge Refurbishment
– Scientific Instruments
– Vacuum Measurement Systems

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