Salt Spray Chamber Troubleshooting: Common Problems and Fixes

This is the most common complaint and usually traces back to one of a few causes, roughly in order of likelihood:

If chamber temperature drifts during a test cycle, check the door/lid seal first — a worn or salt-crusted gasket lets fog and heat escape, and is a far more common cause than a heater or sensor fault. Also check that the chamber isn't installed in a location with a direct draft, strong air-conditioning airflow or major ambient temperature swings, since these can show up as apparent controller instability that isn't actually a chamber fault.

If seals and installation location check out and temperature is still unstable, the controller sensor itself may need calibration or replacement — this is worth confirming against an independent thermometer before ordering parts.

ASTM B117 and ISO 9227 specify an acceptable fog collection rate range, checked using graduated collection jars inside the chamber. If your collection rate is drifting outside range, the usual causes are a partially blocked nozzle changing droplet size, incorrect air pressure, or solution concentration drift — the same root causes as weak fog, just caught earlier through routine collection-rate checks rather than a visibly obvious symptom.

On models with automatic fill and drainage, a system that stops triggering is almost always a sensor or float-switch issue rather than a pump failure — salt residue building up on level sensors over time is a common and easily overlooked cause. Clean sensor contacts as part of routine maintenance rather than waiting for a failure to investigate them.

When samples that should behave the same way show inconsistent corrosion results across runs, it's rarely the samples — it's usually a chamber parameter drifting silently. Work through temperature log data, fog collection rate and solution concentration for each affected run before questioning the coating or plating process itself; an out-of-range chamber parameter can invalidate a result even when the test procedure was followed correctly.

Nozzle cleaning, sensor cleaning, seal inspection and solution concentration checks are routine tasks an operator can handle directly. Call for service when a fault persists after these checks, if there's any sign of electrical fault or unusual noise from pumps/compressors, or if the chamber is out of warranty and you're unsure whether a part needs replacement rather than cleaning. UMA Industries provides installation guidance and after-sales support across its Basic, ASTM B117 / ISO 9227 and Graphical Touch Screen ranges — contact us with the specific symptom and model if a routine check doesn't resolve the issue.