Keeping Your Vacuum Chamber Heaters from Shorting Out
When you’re working with infrared heaters in a vacuum, there’s zero room for error. One tiny electrical arc or a bit of leakage, and you’ve just contaminated your vacuum or fried a sensitive substrate. It’s a nightmare scenario. We build these lamps to take a massive amount of heat, but the real battle is fought at the seals and the quartz envelope. That’s where things usually go wrong.
Why we test every single lamp
Some shops do “sample testing”—they check one out of every ten and hope for the best. We don’t do that. We testevery single lampthat leaves our floor for withstand voltage and insulation resistance. Here’s the thing: physics changes in a vacuum. Gases behave differently, and a microscopic crack in a seal or a pinhole in the quartz can suddenly become a highway for an arc. We push these lamps with a high-voltage stress test to make sure the insulation actually holds. If a lamp fails? It goes in the scrap bin. Period. It’s a lot better to toss a lamp now than to have you install a “time bomb” that blows a fuse or kills your power supply right in the middle of a critical cycle.
Dealing with the heat
High-wattage tubes pack a lot of punch into a small space. That kind of heat makes materials expand and shrink, which puts a ton of stress on the spot where the tungsten filament meets the quartz. To fight this, we use a specific type of sealing glass that moves and breathes at the same rate as the quartz. But even with the right materials, thermal cycling is brutal on equipment. Constant testing is the only way we can be sure the seal stays airtight and electrically isolated when the heat is cranked up to the max.
A quick heads-up on your setup
Our quality control keeps the lamps safe, but they can’t fix a messy setup on your end. If your vacuum chamber isn’t grounded properly, you can get induced currents that mess with how the heater performs. It’s a pain to deal with. Just double-check that your wiring is matched to the lamp’s voltage so you don’t burn them out prematurely.