Electric Micro Dehumidifier

ROSAHL
Instruction ManualRD3(Outside mounting) / RD4(Inside mounting)
NOTICE
1. Please read this manual before you use ROSAHL and use it correctly.
2. Please keep this manual to the person who operates, manages and maintains ROSAHL.

RYOSAI TECHNICA CO., LTD.
8-1-1 Tsukaguchi-Honmachi
Amagasaki-City, Hyogo, 661-0001 Japan
Phone : +81-6-6497-9078 Fax : +81-6-6497-9082

For Proper Usage
Supply 3V DC to ROSAHL. DO NOT reverse the polarity.
Dehumidification changes to Humidification when you get a wrong polarity, which may resultin an adverse effect on several things in the container. Furthermore, it causes a chemical
reaction in a porous electrode of cathode side and it causes the trouble of ROSAHL.

Confirm the dehumidifying / humidifying surface of a membrane not to get a wrong direction
before installation. Attaching ROSAHL by mistake will adversely several things in the container.

DO NOT expose the membrane directly to the winds and rain.
Please cover the membrane with a cover or moisture-permeable sheet to prevent it fromgetting wet when using outdoors.

DO NOT put pin or wire etc into the membrane. It may cause an electric shock andthe membrane may be damaged or deteriorate.

Prohibited

Prohibited

Prohibited

Prohibited

DO NOT use a silicon-based sealing materials to improve airtightness of a container.
Silicon-based sealing materials generate oxime gas and siloxane gas.
As a result, the performance of ROSAHL reduce in a short term.

Prohibited

DO NOT use ROSAHL with vapor phase corrosion inhibitor or insect repellent.
Do not use ROSAHL in a place having high density of organic gas. The performance ofROSAHL reduce in a short term.

Prohibited

DO NOT attempt to disassemble, repair or modify ROSAHL. It may cause an electric shockand the performance deterioration, as this may damage it.

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RB-OP21002

Installation
1

2

3

4

5

6Attach ROSAHL in the center of the side surface of a container with a included gasket.
(Do not attach it on a top or bottom surface.)
If you use a silicon gasket, you need to perform a gasket vulcanize. (200 deg C / 6 hours).
If you do not vulcanize it, It will quickly reduce the performance of ROSAHL.
Note : The silicon gasket using for ROSAHL is vulcanized. (conditions : 200 deg C / 6 hours)

Confirm the dehumidifying / humidifying surface of a membrane not to get a wrong direction before
installation. Attaching ROSAHL by mistake will adversely affect several things in the container.

Make a moisture discharging hole and installation hole on the container where you will install ROSAHL.
(Refer to the Fig.1~2)

Attach a protective cover as needed not to touch the dehumidifying / humidifying surface of a membranewith a hand and an object. In addition, when using outdoors, cover a membrane with a cover or moisturepermeable sheet to prevent it from getting wet. (Refer to the section 2 of Precautions for use)

Make a sealed moisture-impermeable container as much as possible to bring a high performance into
the ROSAHL.

Keep the moisture discharging side of a membrane well ventilated.

Unit : mm
M2 screw

ROSAHL(RD)GasketMoisturedischarging
hole

Installation hole

Installation plateFig.2 Installation dimensions
Fig.1 Installation Image<How to install ROSAHL>
Make a moisture discharging hole and installation holeon the container, insert the included gasket and attach
ROSAHL with four M2 screws.
[Specified torque : Max. 0.18 N·m]

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Precautions for Use of ROSAHL
1. Regarding Sealant
Do not use silicon-based sealing materials to improve airtightness of a container. (Silicon-based sealingmaterials generate oxime gas and siloxane gas. As a result, performance of ROSAHL reduce in a short term.)
Additionally, when using any other sealing materials, ROSAHL must be attached after sealing materials arecompletely cured. Volatile substances generated during curing affect the performance of ROSAHL.
[Recommended product] modified silicon caulk (Konishi Co., Ltd.)
2. Regarding Moisture Permeable Sheet

Attach a moisture-permeable sheet to a membrane to protect ROSAHL from much dust or oil mists.
[Recommended Product] Vent Filter TEMISH : S-NTF2131A-S06 (Nitto Denko Corporation)

3. Regarding Power Supply
Keep strictly the following about power supply to ROSAHL.
(1) Do not reverse the polarity. Confirm a polarity indication of ROSAHL.
Dehumidification changes to humidification when you get a wrong polarity, which may result in an
adverse effect on several things in the container. Furthermore, It causes a chemical reaction ina porous electrode of cathode side and it causes the trouble of ROSAHL.
(2) ROSAHL usually has a big rush current when the power is turned on.
Therefore, we recommend the following power supply.
(3) Use a dedicated power supply for each membrane. When multiple membranes are connected
in series or parallel, the trouble of one membrane may cause all other membranes to be disabled.
(4) The water vapor go through a membrane of ROSAHL. If you switch off a power supply, outside
water vapor is returned to a container and the humidity is restored.
Table 1. Recommended Power Supply Specifications
Rated output voltage
3V DC
Rated output current
500mA
Overcurrent protection function* NoteRequired
Overvoltage protection function
Required
Output voltage variation
0.1V or less
Ripple noise
0.2V or lessIn accordance with the specifications ofOthers
commercially available power supply
Note : Use a constant or fold-back current limiting regarding overcurrent protection function.
You cannot use the power supply with the Hiccup mode current limiting type, because
the voltage more than 2V DC is necessary for ROSAHL when an overcurrent protection
function worked. Also ROSAHL may not work correctly depending on a characteristicof fold-back current limiting.

Dimensions
Gasket(t0.5)

Fig.3 Outline Drawing

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Confirmation Items before Using
Please confirm the following items surely before turning on the power.
1. Is the power supply 3V DC?
2. Is the polarity of ROSAHL correct?
3. Does not a membrane get wet?

Usage
1. Please supply 3V DC to ROSAHL.
2. Please adjust a supply voltage in the range of 2.9 - 3.3V DC between each terminals after 15-20 minutes
turning on the power at the first time of installation.
(ROSAHL naturally causes a relatively big rush current when the power is turned on.
But this is not abnormal.)Specifications

Items
Dehumidifying Performance
Applicable Volume
Element Terminal Voltage
Power Consumption
Dimensions
WeightDimensions of Installation HoleOperating Temperature

Table 2 RD3 / RD4 Specifications
Model NameRD3(mg/day) *1(cc) *2(V)(mW) *3(mm) *4(g)(mm) *5(deg C)

RD484~ 2,0003 DC80
H24×W30×D5.5
1.9
17.5×17.5-10 to 50

Connecting Terminal Type

Soldering *6 or Push connector *7

Installation Direction *8

Outside mounting

Inside mounting

Notes*1 The initial value at the temperature of 30 deg C and humidity 60%RH.
(The dehumidifying performance will reduce during use. How much it degrades depends on theoperating environment and conditions. If any signs of abnormality are seen, early replacement isrecommended.)
In addition, white substances may be attached on dehumidifying surface.
These are the materials of a membrane attached in the manufacturing process
and never affect dehumidifying performance and life.
*2 The applicable volume is for a sealed, moisture-impermeable container, and may vary dependingon the material of the container, state of sealing and required humidity.
*3 The annual average power consumption in average condition in Japan.
*4 Refer to the Figure 3.
*5 Refer to the Figure 1~2.
*6 When you solder to RD3/RD4, twist an electric wire around a terminal and solder within 360 deg C,
five seconds using the soldering iron. (Wire diameter : AWG28~20)*7 For using push connector, use STO-01T-110N (J.S.T.MFG.CO.,LTD.) flat connecting terminal orerquivalent. (Wire diameter : AWG28~20)*8 RD3 is attached to outside of a container, RD4 is attached to inside of a container when dehumidifying
the inside of a container.

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Prohibited Substances and Recommended Materials for ROSAHL
1. Prohibited substances
The substances which adversely affect ROSAHL and harm in response to ROSAHL are as follows.
The anode side is affected mainly. Even the additives of materials may be affected.
Please evaluate enough when a new substance is adopted or a maker is changed.
Classification

Inorganic
MatterOrganic
MatterSubstance Namehydrochloric acid gas

StateNotes

gas

nitric acid gas
other corrosion gases
SOx gasNOx gaschlorine gas
sulfurous acid gas
other pollution gases
concentrated hydrochloric acidconcentrated nitric acidsubstance which produces othercorrosion gas
divalent metal ionsiloxane gas
oxime gas
lamp black
diethylamine
other amine-based gas
amide-based low molecular weightcompoundmethylene chloride
perchloroethylene
trichloroethylene
perchloroethylene
tetrachloroethylene
other chlorinated solvent
oil mist
dimethyl sulfoxide
other sulfur based organic solvent
silicone sealantsilicone greasesilicone rubber
silicone-based sealing compoundother siloxane chemical compoundpran-ace
camphorother insect repellent
paradichlorobenzene
other chlorine-based insect repellent
vapor phase inhibitor
corrosion inhibitor which is added inmaterials
cigaret tar constituent

gas
gas
gas
gas
gas
gas
gas
liquidliquid

2,6-Di-tert-butyl-4-methylphenol (BHT)

liquidThe antioxidant which was added in packing

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liquidliquid
gas
gas
gas
gas
gas
gas, liquid
liquidliquidliquidliquidliquidliquidliquidliquidliquid
solid
solid
solid
solid
solid
solid
solid
solid
gas, liquidgas, liquid
liquid, solid

These substances produce siloxane gas.
Heat treatment (bake) is necessary to remove
low molecule siloxane of non-reaction.

liquid, solidgas, liquid

2. Recommended Materials
The recommended materials in a range understanding in us are as follows.
Classification

Material Name
Glass , Metal , Acrylic , Plastic

Frame
the material which does not include“Silicon group”
Sealing
Compound[Recommended products]
modified silicon caulk (Konishi Co., Ltd.)the material which does not include“Silicon group”

Adhesive

GasketNotes
The acrylic and plastic resin has moisturepermeability. Please thicken the board
thickness when using them.
Do not use silicon-based sealing compounds.
In addition, about the recommendation product,
please operate ROSAHL after completelycured.
(Please avoid operating ROSAHL beforecuring.)
Do not use silicon-based adhesives.

[Recommended products]
Silex, SL220W, SL220LB(Konishi Co., Ltd.)
Silicon rubber(secondary vulcanization finished)
EPT rubber [Ethylene-propylene](single bubble)
PTFE rubber [Polytetrafluoroethylene]

About the silicon rubber, please performsecondary vulcanization by all means.
(ex. 200 deg C / 6 hours)
In addition, we don’t evaluate all silicon rubber,
EPT rubber, PTFE rubber.
Please evaluate enough when using them.

The above are just as of April 1, 2021 but not all of them. Please verify in advance and evaluate enoughwhen using our electric dehumidifier “ROSAHL”. We don’t take any responsibility or liability for any
damage or loss caused through the unknown phenomenon and the wrong usage.

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