Installation Guide: M-2J1R-SET

The M-2J1R-SET installation kit provides all components needed to install the Rosahl M-Series membrane dehumidifier—except for standard hand tools.

Image of Rosahl mounting kit for M-1J1R membrane

Typical M Series micro dehumidifier mounting kit

Overview

When installed inside a sealed enclosure, the M-Series dehumidifier expels moisture through the membrane. Installation requires a cut-out in the enclosure wall where the membrane can be mounted to allow moisture removal. The process is silent, waterless, and maintenance-free.

For small or tightly packed enclosures, the membrane can be installed externally. In this case, the M-3M1R-SET enables the unit to draw moisture from inside the enclosure by redirecting the outflow path.

Important: Reversing power polarity does not reverse moisture flow. Doing so will damage the membrane. The included mounting kit is designed to maintain correct orientation and function. When combined with the supplied USB-C power adapter, it provides a simple, efficient solution for low-power dry storage.

These membrane kits are suitable for use with a wide range of sealed display and storage enclosures to protect sensitive and delicate equipment. They are also ideal for applications such as drying 3D printer filaments without needing desiccant.

To reverse the function (humidify), mount the membrane inside the enclosure. This depends on sufficient ambient moisture.

Assembly & Mounting Instructions

1. Mounting Cover Components

The mounting kit consists of:
– Inner fixture – holds the membrane and USB-C power module.
– Outer cover – secures and protects the assembly.
– Back plate – optional for extra support on flexible enclosure walls.

2. Marking and Preparing the Cut-out

  1. Position the inner fixture at the desired location and mark screw holes. It may be easier to hold it upside down.
    2. Drill one hole first, temporarily bolt the fixture in place, then drill the remaining holes.
    3. Use a 3.5 mm drill bit for mounting holes. The fixture’s holes are slightly oversized to allow for alignment.
    4. Cut the membrane opening using one of the following methods:
    – Rotary tool with a cutting disk.
    – Manual method: Drill a ring of small holes and file the edges smooth.

3. Installing Components

Caution: Do not touch the black (internal) or grey (external) membrane surfaces. Wear gloves to prevent damage or contamination.

1. Insert the rubber sealing ring into the recess in the mould under the membrane mounting location. If needed, a few small drops of superglue may help hold it; allow time for off-gassing before continuing.
2. Install the USB-C power module into the inner fixture. Ensure the cable and socket align with the exit hole and the clip holds it in place
  1. Connect the power wires to the membrane without damaging the surfaces. The terminals are different sizes to prevent incorrect polarity—do not force or reverse them.
    4. Place the membrane into the fixture with the black face towards the sealing ring.
    5. Slide the outer cover over the assembly, keeping the USB-C socket exposed.

4. Final Mounting

  1. Position the assembled unit over the enclosure cut-out.
    2. Use the original gasket between the fixture and enclosure wall.
    3. Fix using the nuts and bolts from the supplied M-5PKT kit.
    4. If the wall is thin or flexible, use the back plate inside the enclosure for a firm seal.

Parts List

– M-2J1R membrane and gasket
– M-2JCOM inner + outer mounting fixture
– Pre-wired USB-C power supply adapter
– Rubber sealing ring
– Back plate option
– Fixing screw kit M-5PKT

Notes

– Ensure all electrical connections are correct before final assembly.
– Always use the sealing ring to prevent moisture leakage.
– Confirm that the gasket is fully compressed for an airtight seal.
– Illustrations are for guidance only.
– Version 1.1