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Humidity Control Humidity Control
Nitrogen Purged—a controlled flow of clean, dry nitrogen dilutes moisture-laden air, which gradually exits through a bleed valve.
Desiccato-level Control image arrow Desiccator-Level Control:
A single gas-in port distributes gas equally throughout the desiccator.
An economical way to achieve low-humidity conditions in small desiccators with few chambers; manual systems use a flowmeter, and automated systems include an RH sensor and N2 feedback control.
  Chamber-level Control
  Chamber-Level Control:
A separate gas-in port, bleed valve, and RH sensor in each desiccator chamber optimize efficiency and minimizes recovery time, allowing chamber-by-chamber setpoint control.
Ideal for multi-chamber cabinets and critical low-RH monitor/control requirements
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Desiccant (usually indicating silica gel or molecular seive) adsorbs moisture from air inside the desiccator. Some systems include regenerating cycles that bake the desiccant when it becomes saturated. Ideal for low-cost, non-critical applications, but frequent parts access and high regeneration frequency may lead to humidity fluctuations.

Vacuum evacuates air and water vapor; a backfill valve introduces clean, dry process gas (generally nitrogen). Multiple pump/backfill cycles may be required. Achieves very low RH conditions, but requires reinforced chamber (often cylindrical) and vacuum pump.

Uncontrolled cabinets provide a dust-free environment without RH control.

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