Desiccators- Desiccant and Gas Purge Cabinets
Desiccators are reliable choice to store and organize humidity sensitive products. It also provides clean and dust-free storage environment that required for sensitive parts.
A desiccator could use to keep a dried sample dry, however it may not be sutable to dry samples. In a desiccator it would take a long time for your sample to dry, so alternative solution can be used.
There are five common types of desiccator:
or Desiccant Chambers use desiccant such as silica gel bead to absorb moisture from the enclosure. The desiccant is usually available in reusable desiccant cartridge / canister.
Pros: Inexpensive and economical solution. Desiccant can be re-generated in either a conventional oven or a microwave oven.
Cons: They require manual monitoring so that cartridges can be replaced as needed to maintain a continuous dry environment. The silica gel will work at the lower absorbing rate when the temperature raising (e.g. Above 100 F)
Plastic Desiccator Cabinet
Stainless Steel Desiccator Cabinet
2. Automatic Desiccators
which regenerate desiccant as needed. They usually use electrical heater and fan to prevent moisture saturation on the desiccant.
Pros: Convenience solution, so not required manual monitoring. Humidity and regeneration cycle will be automatically done.
Cons: Still using silica gel so the dehumanization process is still slow and the lowest RH% level can achieve is limited to the ambient temperature and humidity level.
which use continuous flow of inert gas such as dry nitrogen or compressed dry air to maintain low humidity. Using nitrogen will also reduce the oxygen level in the desiccator. A Flow-meter is required to control the flow rate.
Sliding Shelf/Wafer Storage
Extra Wide Desiccator
Sliding Drawer Desiccator
Sliding Drawer Desiccator
Pros: They can achieve the low humidity level much faster than desiccant specially in large size desiccator or multi-chamber desiccator cabinets. Depends of dryness of gas supplied, the RH% can reach about 0%. Flow rate cab be increased to speed up the process and can be reduced to maintain the dryness. They maintain positive pressure inside the chambers to create a dust free environment as desired for many applications including clean rooms.
Cons: They still require manual monitoring. Inert gas cost is usually higher than desiccant. The gas consumes more than needed. Oxygen deficiency is a risk specially when the gases such as nitrogen released to the air. So the proper ventilation required and oxygen deficiency detector is highly recommended.
4. Automated Gas Purge Desiccators
have same function as standard models, but they use automatic controlled purge system that continuously monitor RH% within the chambers and automatically adjust the gas flow to maintain the RH% level on the setpoint.
Pros: Besides the advantage of standard gas purge desiccator, in automated models, the inert gas consumption and the cost can be significantly reduced. Very convenience, they do not require manual monitoring.
which reduce humidity by evacuating the air from the chamber using a vacuum pump or in-house laboratory vacuum. They can also be used for degassing techniques.
The vacuum desiccators are available in round (Jar) or cubic (Cabinet) style. Cubic style desiccators have easier accessibility and greater usable storage capacity.
Standard Type 1 & 2 Desiccator Cabinets
Custom Desiccator Cabinet
Pros: They are ideal for ultra-dry condition, and where minimum oxygen level needs to maintain. Some vacuum desiccator can backfill purge with another gas after vacuum applied.
Cons: Both round and cabinet style desiccators are very limited in storage capacity and shelving. They range in size from quite small up to 2 cubic feet (Cleatech Desiccator brand offers up to 8 cubic feet). Due to the thick wall construction are usually heavier than regular desiccator. Vacuum may need to reapply periodically depends on the leak rate of vacuum chamber.