Electric Dehumidifier

ROSAHL
Instruction Manual
MDL-3 / MDL-5 / MDL-7
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.

ProhibitedProhibited

Prohibited

Keep the moisture discharging side of membrane well ventilated.
Prohibited

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

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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Prohibited

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Installation·As shown in the right figure, fit gasket to both sides ofROSAHL, attach the retainer plate on the top and fasten
at around four points around the edge with M4 screws.
If the necessary distance is not secured between theconnecting terminal of ROSAHL and the panel surface,attach ROSAHL to an installation plate or such other plate
and then install to the panel surface.
·Gaskets used should be made from EPT(ethylene propylene)
series and have hardness of approximately 8.
·When installing in an outdoor panel, avoid interference withthe attaching screws of the rainproof cover.
Table 1. Gasket processed dimensions (mm)Model name
MDL-3
MDL-5
MDL-7
Dim. a45
7090
Dim. b707090Dim. c305575Dim. d555575
Reference
Figure 1
Table 2. Retainer plate processed dimensions (mm)Model name
MDL-3
MDL-5
MDL-7
Dim. e80105125
Dim. f
757595
Dim. g3055
75
Dim. h555575
Dim. j7095115
Dim. k40
4060
Reference
Figure 2
Table 3. Installation dimensions (mm)Model name
MDL-3
MDL-5
Dim. m3055
Dim. n55
55
Dim. p7095
Dim. q4040
Reference
Figure 3

Material : EPT
Hardness : 8±5Thickness : 2mm
Fig.1 Gasket

Material : SUS
Thickness : 3mm
Fig.2 Retainer plate

MDL-7757511560

Table 4. Rainproof cover installation dimensions (mm)*Option parts
Model nameMDL-3MDL-5
MDL-7
Dim. r135
135
175
Dim. s125
125
150
Rainproof cover
For RDH-5J1
For RDH-7J1
Model name
Reference
Figure 3

Fig.3 Installation dimensions

Precautions for Use of ROSAHL
1) Attach a protective cover as needed not to touch the dehumidifying / humidifying surface
of a membrane with a hand and an object.
2) 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.
3) 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 inan 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 membrane are connected inseries 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 into a container and the humidity is restored.
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Table 1. Recommended Power Supply Specifications
ModelMDL-3
MDL-5

Item
Rated output voltage
Rated output current
Overcurrent protection function
Overvoltage protection function
Output voltage variation
Ripple noise

MDL-73V DC
2A3A
5A* NoteRequired
Required
0.1V or less
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.
4) A container must be an airtightness container. If a container has low airtightness and moisturepermeable material, the results may not be what you expected.
5) Attach ROSAHL in the center of the inner side surface of a container with a gasket.
(Do not attach it on a top or bottom surface.)
6) If you use ROSAHL with a gasket that contains an antioxidant, crystal materials may be generated on
the surface of a membrane. When you choose a gasket, evaluate it enough.
7) Do not use 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.)
Additionally, when using any other sealing materials, ROSAHL must be attached after sealing materials
are completely cured. Volatile substances generated during curing affect the performance of ROSAHL.
[Recommended products] : modified silicon caulk (Konishi Co., Ltd.)
8) Do not expose a moisture discharging side of a membrane to water. When using outdoors, be sureto attach a cover or vent filter to protect a membrane from water or insects.
9) Attach a moisture-permeable sheet to a membrane to protect ROSAHL from much dust or oil mists.
[Recommended products] : Vent Filter TEMISH S-NTF2131A-S06 (Nitto Denko Corporation)10) Keep the moisture discharging side of a membrane well ventilated.
11) 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.
12) Do not do remodeling. ROSAHL may break down.
13) When you use a silicon gasket for attachment, you need to vulcanize it (200 deg C / 6 hours)
not to quickly degrade the performance of ROSAHL.

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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
WeightOperating Temperature
Connecting Terminal Type

Table 2 MDL-3 / MDL-5 / MDL-7 Specifications
Model Name
MDL-3
MDL-5
(g/day) *1(m3) *2(V)(W) *3(mm) *4(g)(deg C)

MDL-74~ 0.5816~1~23 DC236
88×63×2.3
88×88×2.3
108×108×2.3202550-10 to 50(+) side : STO-41T-110N (J.S.T.MFG.CO.,LTD.) or equivalent( - ) side : STO-41T-110N-8 (J.S.T.MFG.CO.,LTD.) or equivalent

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.)*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 Dimensions show the values of H × W × D in the figure below.

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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 ion
siloxane 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)

liquidliquidliquid
gas
gas
gas
gas
gas
gas, liquid
liquidliquidliquidliquidliquidliquidliquidliquid
liquid
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

5 / 6The antioxidant which was added in packing

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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 before
curing.)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.

Precautions in the Use for the Storage Cabinet
1. When you use ROSAHL to dehumidify into the storage cabinet, do not store volatile rust preventive orthings that organic gas volatilizes. The volatile gas which is released from goods reacted at a membrane's
anode and new harmful gas is produced.
As a result, not only it causes decrease in performance of ROSAHL, but also it might adversely affect on
goods in the storage cabinet. We cannot guarantee even if harm occurs to the stored valuables under theinfluence of new produced gas. Please evaluate enough when you use ROSAHL for the storage cabinet.
2. The maker who produces and sells storage cabinet equipped with ROSAHL should explain that enoughfor end users using the storage cabinet.

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