Vacuum Gauge

Technician installing vacuum gauge on stainless vacuum pipe

Why Your Vacuum Gauge Reads Differently After Maintenance

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Reassembly Sealing Differences Maintenance on a cold-cathode gauge almost always involves disassembly. With the Poseidon Scientific VG-SM225 Cold Cathode Vacuum Gauge, the sensor head is intentionally removable without breaking the vacuum seal on the chamber. Operators unscrew the “工”-shaped electrode stack, lightly abrade the stainless-steel cathode and anode surfaces with 200- or 500-mesh sandpaper to […]

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Interior of high vacuum stainless steel chamber

Understanding Molecular Flow Region in High Vacuum Measurement

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Transition from Viscous to Molecular Flow In vacuum systems, gas behavior changes dramatically as pressure drops. At higher pressures (typically above ~1 Torr), gas flow is viscous or continuum: molecules collide far more frequently with each other than with chamber walls. Viscosity and pressure gradients govern transport, much like fluid flow in pipes at atmospheric

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Vacuum transmitter connected with long shielded cable

How Cable Length Impacts Vacuum Gauge Signal Stability

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Signal Attenuation Analog signals from vacuum gauges—particularly the 0–10 V output used by both the Poseidon Scientific VG-SP205 Pirani Vacuum Transmitter and VG-SM225 Cold Cathode Vacuum Gauge—travel as voltage levels referenced to ground. Over distance, two primary mechanisms cause attenuation: resistive voltage drop in the cable conductors and capacitive loading that rounds sharp edges in

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Vacuum gauge installed on PVD coating chamber wall

Vacuum Monitoring in PVD Coating: Where to Place Gauges for Best Film Quality

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Pump-down Stage Monitoring Physical vapor deposition (PVD) coating quality starts with a clean, reproducible base vacuum. Residual gases—water vapor, oxygen, or hydrocarbons—can react with sputtered material and degrade film adhesion, stoichiometry, or optical properties. The pump-down phase therefore requires continuous, accurate monitoring from atmosphere down to at least 10−6 Torr. The Poseidon Scientific VG-SP205 Pirani

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Vacuum gauge undergoing calibration on laboratory bench

Vacuum Gauge Calibration Interval: Annual or Process-Based?

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ISO Calibration Recommendation Overview Vacuum gauge calibration practices are guided by international standards, but they emphasize risk-based decisions rather than rigid schedules. ISO 3567:2015 specifies the method for calibrating vacuum gauges by direct comparison with a reference gauge under controlled conditions. It defines traceability to national metrology institutes (such as NIST or PTB) and outlines

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Vacuum gauges installed on semiconductor load lock chamber

Choosing Vacuum Gauges for Semiconductor Load Locks

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Load Lock Vacuum Cycle Stages In semiconductor fabrication, load locks serve as critical airlocks between the cleanroom atmosphere and the ultrahigh-vacuum process chambers used for etching, deposition, and lithography. A typical load-lock cycle follows a repeatable sequence that protects wafer integrity while maximizing tool throughput. Stage 1 begins with the outer door open at atmospheric

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Cold cathode vacuum gauge mounted on industrial vacuum system

How Contamination Affects Cold Cathode Plasma Stability

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Plasma Discharge Principle in Cold Cathode Gauges Cold cathode ionization gauges, such as Poseidon Scientific’s VG-SM225, operate on the Penning discharge principle. A high-voltage electric field (typically –2000 V working, –2500 V startup) combined with an axial magnetic field (~100 gauss from NdFeB permanent magnets) traps electrons in cycloidal or spiral paths. These electrons collide

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Vacuum gauge monitoring chamber during leak test

Leak Detection Using Pressure Decay: How Accurate Is Your Gauge?

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Leak Detection Using Pressure Decay: How Accurate Is Your Gauge? In vacuum systems for mass spectrometry, PVD coating, vacuum heat treatment, and semiconductor processing, leak detection is a daily reality. The pressure-decay method offers a simple, cost-effective way to quantify leaks without helium tracer gas or expensive mass spectrometers. Isolate the chamber, pump to a

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Digital vacuum gauge display during rapid pressure decrease

Vacuum Gauge Response Time in Fast Pump-Down Cycles

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Vacuum Gauge Response Time in Fast Pump-Down Cycles In semiconductor processing, PVD coating systems, and analytical instruments, pump-down cycles are increasingly aggressive. Turbomolecular and cryo pumps can drop chamber pressure from atmosphere to 10⁻⁶ Torr in under 60 seconds. Vacuum gauges must keep pace—otherwise interlocks trip late, process recipes start at the wrong pressure, or

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Cold cathode vacuum gauge installed on industrial vacuum chamber

Cold Cathode Electrode Wear: How Many Operating Hours Can You Expect?

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Cold Cathode Electrode Wear: How Many Operating Hours Can You Expect? In high-vacuum applications such as mass spectrometry, scanning electron microscopy, and vacuum heat-treatment furnaces, the cold-cathode gauge has become the preferred sensor for pressures from 10⁻³ Torr down to 10⁻⁷ Torr. Unlike hot-cathode designs that rely on a fragile filament, cold-cathode gauges use a

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