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Rosahl Solid State Humidity Control

Power Supplies

​To achieve the expected performance from your Rosahl membrane dehumidifiers, it is important to use a suitable power supply (PSU). Moisture held within an unused dehumidifying membrane can cause high inrush currents on start up.

Rosahl dehumidifier range
Rosahl dehumidifier range

Selecting your power supply (PSU)

Moisture within the dehumidifying membrane can cause high inrush currents on start up. The manufacturer recommends a constant current limiting PSU with an output current suitable for the rating of the membrane used. However, these are not always available. Fold-back type PSUs may be suitable provided the output voltage does not fall below 1.8V DC during overload conditions. Hiccup mode power supplies are generally unsuitable unless matched to the membrane inrush current levels.

To simplify selection, below are power supplies that meet the requirements of the membrane without causing nuisance tripping.

VREG2 power supply

Power supply for compact membranes

The VREG2 Series power adapter board connects to a standard USB power source and adapts it to 3V DC suitable for the Rosahl membranes. They are fitted with a USB-C connector on the board. If you already have a 5V DC source the VREG will also accept a pigtail to USB-C adapter.

It delivers 3V DC at up to 3000mA with a fold-back current limiting output and has solder pads for the output connections. It is suitable for use with all PD, RD and RS Series. Also, the M-IJ, M-2J M-3M and M-3J Series and MDL-3 membranes.

Coming soon

Optional VREG mounting base

This simple base-mounting module accepts the VREG2 USB-C power adapter board designed for the PD, RD and RS Series. Also, the M-Series M-IJ, M-2J M-3M and M-3J and MDL-3 membranes.

 

Optional VREG barrel mounting

This simple barrel mounting module accepts the VREG2 USB-C power adapter board designed for the PD, RD and RS Series. Also, the M-Series M-IJ, M-2J M-3M and M-3J and MDL-3 membranes.

 

Rosahl dehumidifier range

Switching power supplies

A range of  semi-enclosed and open board type switching power supplies (PSUs) suitable for use with Rosahl membranes is available from Westside International. They have an input voltage range of 85 to 264V 50/60Hz and an adjustable 3V DC output. They are RoHS compliant. Select the correct model from the table.

Note: All switching power supplies need additional electrical protection and installation by a suitably qualified person avoid contact or injury from mains voltage electricity (100/200V AC).

 

Rosahl dehumidifier range

 

 

Typical open board power supply

 

Switching power supply Switching selection

MembraneCable harnessStyleModel
M-1J, M-2J, M-3M, M-3J, MDL-3NoSemi-enclosedLS25-3.3
M-5J1R
MDL-5
NoSemi-enclosedLS75-3.3
M-7J1R
MDL-7
Input & OutputOpen board typeLDA30F-3
M-10J1R
Input & OutputOpen board typeBWB3.3SX-U1A

Coming soon

New membrane installation and mounting kits