Vacuum Gauge

Vacuum Gauge Placement Near Pump vs Near Chamber: Pressure Gradient Impact In vacuum systems ranging from mass spectrometers to PVD coating chambers, engineers often debate where to mount the vacuum gauge: directly on the process chamber or near the pump inlet. The choice is far from cosmetic. A seemingly small difference in mounting location can

Why Pirani Gauges Drift When Switching Gas Types In vacuum systems, engineers and procurement teams rely on Pirani gauges for reliable pressure monitoring from atmosphere down to roughly 10⁻³ Torr. Yet many users notice sudden, unexplained shifts in displayed pressure when the process gas changes—even when the true pressure has not moved. These “drifts” are

Explain Cold Cathode Ionization Ignition Physics Cold-cathode ionization gauges, such as the Poseidon VG-SM225, operate on the Penning discharge principle. A high electric field (typically –2000 V working voltage, –2500 V at startup) extracts initial electrons via field emission from the cathode surface. These electrons are trapped in crossed electric and magnetic fields (~100 gauss

Installation Errors: Positioning and Mounting Practices That Eliminate Systematic Bias Vacuum gauge readings are only as accurate as the physical location and connection to the chamber. Even the most precise transmitter will report erroneous values if installed where pressure differs from the process volume. In thin-film deposition, metallurgy, and freeze-drying systems, engineers commonly encounter three