Rosahl RD3 Dehumidifier Membrane
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Product Description
The RD3 by Rosahl is a compact flat-membrane dehumidifier module for volumes of up to 2 litres at the outside of an enclosure.
Operation Principle
Rosahl dehumidifiers are based on a solid-state polymer membrane. When supplied with a 3V DC voltage, moisture on one side is being decomposed into Hydrogen ions and Oxygen, the Hydrogen ions pass the membrane and recombine with air Oxygen to moisture again on the other side and get discharged.
Power Supply
Rosahl dehumidifer membranes requires a 3V DC supply voltage and draws in continous operation i.e., when the moisture level in the volume stabilized to a low level, just around 0.1-2W power depending on membrane size.
Due to the membrane being intrinsically hygroscopic, it absorbs humidity if no supply voltage is present. This moisture needs to be discharged on startup and leads to a significantly higher inrush-current that the regular operating current. During startup the supply voltage shall still not drop below 2V, otherwise moisture discharge is not possible or significantly delayed. Suitable current supplies are fold-back current limiting sources, which regulate the output current further down than pure constant current sources and hence maintain a certain output voltage. We provide suitable USB-C voltage regulator modules with fold-back current limiting, which can be used stand-alone or mounted into our 3D-print mounting frame/covers.
VREG-2 USB-C Power Supply Module 3V/3A
Technical Parameters
| Applicable Volume | ~0.002m³ |
| Dehumidifying Performance | 0.084g/day |
| Supply Voltage | 2.9-3.3VDC |
| Power Consumption | 0.08W (20°C/60%rH) |
| Rated Current | 50mA (dep. of rH) |
| Inrush Current | 0.5A |
| Operating Temperature | -10°C - +50°C |
| Operating Humidity | <=90%RH |
| Connecting Type | Solder Tabs |
| Weight | 0.9g |
| Dimensions | 17x17x11 mm³ |
Further Information
Scope of Delivery
The Rosahl PD2 dehumidifier comes as single unit with gasket.