Dehumidification Systems

All dehumidifiers from DST use the high quality SSCR rotor from Seibu Giken, Japan. Dehumidifiers from DST are continuously improved at our R & D department. Here, you can read more about the high technology rotor from Seibu Giken and out the different sorption principles, used in DST dehumidifiers.

Section of a dehumidifier rotor from Seibu Giken. The high number of channels means that moisture is adsorbed with extra efficiency.

SSCR Sorption Rotor

All DST desiccant dehumidifiers use the Seibu Giken silica gel rotor. In the Seibu Giken rotor the silica gel is chemically bonded to the structure, which means that there is no desiccant carry-over to the air. It also means an excellent lifetime. After 10 years of operation the Seibu Giken rotor retains more than 90% of its original capacity. Another important feature is that the Seibu Giken rotor can be washed if it becomes contaminated. This is especially important for rotors working under harsh conditions.

Seibu Giken was the first company to develop a silica gel rotor and is still the technology leader.

Tests carried out by the well-known Frauenhofer Institute show that no dust is carried over to the dry air in a Seibu Giken rotor. Tests on DST dehumidifiers placed in sewage stations have also shown that the rotor is bacteriostatic.

The adsorption rotor is manufactured from alternate layers of flat and corrugated sheets, impregnated with an active component called desiccant. It is made to form a vast number of axial air channels running parallel through the structure. As the air passes through the channels it is dried. 

The rotor is the most important part of the dehumidifier. It is the rotor that determines the capacity and the lifetime of the unit. Hence you want a dependable, stable and efficient rotor. The following things are important to consider when choosing. 

1 The desiccant material 

Back in the fifties, when the desiccant rotor dehumidifier was invented, lithium chloride salt was used as the desiccant. Lithium chloride absorbs the moisture through a chemical reaction. The disadvantage of a salt impregnated rotor is that it can't withstand high humidity. Saturated air will cause the salt to partially leave the rotor and thereby decrease the capacity and cause corrosion of the dehumidifier. Today more and more dehumidifiers use silica gel rotors. The silica gel adsorbs the moisture, the water molecules adhere to the surface of the silica gel. The advantage is that it can withstand saturated air and, if the silica gel is chemically bonded to the rotor, it has a very long lifetime, up to ten years if taken well care of. 

2 Will there be dust from the rotor?

Both lithium chloride and silica gel rotors containing loose desiccant will cause some dust to leave the rotor with the dry air. Apart from possible damage of dried materials the capacity of the rotor will deteriorate. Only rotors with chemically bonded silica gel will have no desiccant carry-over to the dry air. 

3 Washability 

If the rotor is contaminated by accident or used in applications with contaminated air, for example oil mist, it is important that the rotor is washable, and that you can wash it yourself! Having to leave the rotor away for washing is costly and causes a longer downtime. 

4 Bacterial growth 

Tests on a silica gel rotor used in a water sewage plant shows no bacteria formation on the rotor. This is thanks to the high temperature (above 120°C) when regenerating the rotor and to the low relative humidity in the dry air.

SSCR-H Bactericidal & Hygienic Rotor

DST offers a dehumidification rotor, specifically developed to maintain the desired indoor climate in the food and pharmaceutical industry. The SSCR-H can be installed in new or existing rotor-unit from Seibu Giken DST.

The SSCR-H rotor has a high dehumidification capacity; it is bacteriostatic and bactericidal - the rotor surface effectively eliminating airborne bacteria. It was successfully tested in the Japan Food Research Laboratories in 2001. 

SSCR-CI Silicon Free Rotor

SSCR-CI regulates humidity without spreading any silicon in the air at all.

The unique SSCR-CI rotor is a 100% silicon-free sorption rotor which maintains full dehumidification capacity. For the automotive industry, pharmaceutical industry and other environments which demands silicon-free ambient air.

Thanks to thorough research, Seibu Giken has managed to produce the only 100% silicon free rotor on the market,

SSCR-CI is available only from Seibu Giken DST. 

SSCR-CI can be used to replace existing dehumidification rotors.

This Zeolite rotor from Seibu Giken is developed for dehumidification at low dew points. 

Aquasorb

Aquasorb basically functions as a Consorb but the wet air flow is condensed in an air-chilled condenser instead of being led out. Thanks to the common fan for dry air and cool air, all energy is accumulated in the dry air. Aquasorb has a high dry airflow, which improves the drying effect.

Aquasorb-A-30B/Bp Dehumidifier

Aquasorb A-30B/Bp is a sorption dehumidifier that condenses out the moisture. The chassis is made of stainless steel, which is especially important in condensing units. The rotor is, as always, washable, all energy is accumulated in the dry air. Aquasorb operates at dew-points below 0°C.

0,5 kg/h Dehumidifying capacity at 20°C / 60%RH.

Recusorb DR

Like Recusorb R, Recusorb DR has heat recycling, but has a fan for both the dry airflow and the wet airflow. This makes installation simpler when you require overpressure in the room to be dehumidified. This principle is also suitable when you want to achieve very low dew points.

DR-10B

DR-010B is a handy dehumidifier that weighs only 12 kg.

All dehumidifiers from DST with the prefix DR are comprised of a single phase unit in stainless steel. 

0,5 kg/h Dehumidifying capacity at 190 m³/h - 20°C / 60%RH.

DR-010B MH1

DR-010B MH1 is a handy dehumidifier with a built in humidistat which enables easier installation. The unit must be installed in the same room that is being dehumidified.

The humidistat is supplied by company Sauter, which guarantees a high level of reliability.

0,5 kg/h Dehumidifying capacity at 190 m³/h - 20°C / 60%RH.

DR-20B 

DR-20B is stainless steel with sturdy handles and robust feet so that the unit is easier to stack. DR-20B is used for example for the dehumidification of military stores, water damaged houses and hydroelectric power stations. They are even used as permanent installations in buildings with mould problems. 

0,8 kg/h Dehumidifying capacity at 330 m³/h - 20°C / 60%RH.

DR-30D

DR-30D is the big brother of the DR-20B but with a larger dehumidifying capacity. DR-30D is used for the dehumidification of water damaged houses and warehouses as well as being used as a permanent installation in buildings with mould problems. 

1,1 kg/h Dehumidifying capacity at 360 m³/h - 20°C / 60%RH.

DR-031C

DR-031C in stainless steel may be used for the dehumidification of warehouses, archives or other smaller spaces. DR-031C dehumidifies according to the Recusorb-principle. 

1,6 kg/h Dehumidifying capacity at 310 m³/h - 20°C / 60%RH.

DR-40 T10 and DR-40 T16

DR-40 T10 is maintenance friendly with components that are easy to strip down. 

DR40 T16A has a powerful dry air flow for effective dehumidification.
Both units are powerful single phase dehumidifier fitted with practical handles and designed wholly in stainless steel with a highly effective SSCR-rotor from Seibu Giken. 

DR-40 T10 have 1,6 kg/h 600 m³/h and DR 40 T16 550 m³/h have 2,3 kg/h Dehumidifying capacity at 20°C / 60%RH.

DR-50R

DR-50 is maintenance friendly with components that are easy to strip down. 

DR-50 is perfect for example for dry and chilled storage, water damage restoration and other applications that demands a controlled level of humidity. 

2,8 kg/h Dehumidifying capacity at  600 m³/h 20°C / 60%RH.

Consorb DC

The Consorb principle is normally used at low regeneration temperatures, e.g. if you have surplus heat or when dehumidifying very damp air.

DC-10

DC-10 weighs only 15 kg and dehumidifies according to the Consorb-principle. The DC-10 dehumidifier is maintenance friendly, has a long lifetime and rust free chassis.

0,6 kg/h Dehumidifying capacity at 190 m³/h - 20°C / 60%RH.

DC-031B

DC-031B is a portable single phase unit in stainless steel. DC-031B dehumidifies according to the Consorb-principle. 

1,4 kg/h Dehumidifying capacity at 300 m³/h - 20°C / 60%RH.

DC-031C 16A

DC-031C 16A is a single phase unit in stainless steel. DC-031C dehumidifies according to the Consorb-principle. 

2,1 kg/h Dehumidifying capacity at 490 m³/h - 20°C / 60%RH.

DC-50 R

The DC-50 has a similar housing to the DR-50 but runs with two fans. This unit is the right choice when you need to re-circulate air in a room, and have a big difference in moisture content between room air and outdoor air. 

3 kg/h Dehumidifying capacity at 550 m³/h -  20°C / 60%RH.

Recusorb R

Recusorb R operates using integrated heat recycling. During the rotor’s regeneration (green), heat is absorbed, and then recycled in the “purge zone”, where incoming air is pre-heated and partly dehumidified. Energy consumption falls and the dry air becomes both drier and cooler compared to other sorption dehumidifiers.

R-60BR

Mid-range industrial desiccant dehumidifiers for medium volume dry air stores and sports halls, museums, small clean rooms and manufacturing processes.

Manufactured in 2333 stainless steel, these units include internal heat recovery, electric reactivation and Auto-Manual mode switching. Pre-wired for simple humidistat control as standard, units are also available for two 2 step binary control (from EH4 2 step controller) or linear capacity control (from EH3 PI controller or BMS control signal).

Dehumidifier R-060BR can also be made a mobile dehumidifier, placed on a wagon, and is used for serious water damages. 

4,6 kg/h Dehumidifying capacity at 1000 m³/h -  20°C / 60%RH.

R-51/61R

Mid-range industrial desiccant dehumidifiers for medium volume dry air stores and sports halls, museums, small clean rooms and manufacturing processes.

Manufactured in 2333 stainless steel, these units include internal heat recovery, electric reactivation and Auto-Manual mode switching. Pre-wired for simple humidistat control as standard, units are also available for two 2 step binary control (from EH4 2 step controller) or linear capacity control (from EH3 PI controller or BMS control signal).

R-51 1250 m³/h - 7,3 kg/h and R-61R 1.450 m³/h - 10 kg/h Dehumidifying capacity at 20°C / 60%RH.

 RZ-71 - RZ-81 - RZ-101 - RZ-102

Industrial dehumidifiers using desiccant technology, for large warehouses, cold stores, ice rinks and sports halls; chemical, pharmaceutical and confectionery manufacturing processes.

Manufactured in aluzinc, these units include internal heat recovery as standard, and are available with electric, steam or direct fired gas reactivation. Capacity control options include simple On/Off, multi-stepped binary control and full PID linear control.

Owing to the PLC-control the user can have full control over the relative moisture and temperature in the room or construction area. It is possible to receive notification via an SMS from the dehumidifier if for example the set temperature level is exceeded.

RZ-71 2.500 m³/h - 14 kg/h, RZ-81 2.800  m³/h - 19 kg/h, RZ-101 4.500 m³/h - 30 kg/h and RZ-102 7.000 m³/h - 50 kg/h Dehumidifying capacity at 20°C / 60%RH.

RZ-ICE

RZ Ice is a RZ unit specially developed for the dehumidification of ice rinks. This dehumidification unit has a low dry air flow and is fitted with powerful fan units.

Manufactured in aluzinc, these units include internal heat recovery as standard, and are available with electric, steam or direct fired gas reactivation. Capacity control options include simple On/Off, multi-stepped binary control and full PID linear control.

RZ-71 4.500 m³/h - 13,5 kg/h, RZ-81 4.500  m³/h - 19,5 kg/h, RZ-101 9.000 m³/h - 32 kg/h and RZ-102 12.000 m³/h - 54 kg/h Dehumidifying capacity at 20°C / 60%RH.

RZ-Flex

RZ Flex consists of a modular system integrated with an RZ standard dehumidifier. Choose components such as precooling and postcooling, or integral temperature and moisture control.

Tetisan DST supplies a complete unit, which results in simpler planning,

faster commissioning and unequivocal functional responsibility compared with systems built up via several different suppliers. All control functions are tested at the factory prior to delivery.

RZ Flex has been developed for applications requiring complete solutions for dehumidification, with moisture and temperature control. These units can also be fitted with special rotors for environments with special requirements; during pharmaceutical manufacturing, in the plastics industry, the manufacture of food and confectionery, the automotive industry, and others.

RF Series

The RF range is a series of compact dehumidifiers which have been developed to meet the varying needs of the process industry. The RF units are suitable for applications requiring

complete solutions for dehumidifi cation, with moisture and temperature control.

Low energy consumption.

The Recusorb dehumidification principle involves integral heat recovery and hence low energy consumption.

You can choose from electricity, steam or gas for rotor regeneration so that you can always make the most of all energy options open to you. Energy saving systems combined with various options allow you to create a dehumidifier to suit the specific needs of each and every project.

Rotor Options

Seibu Giken DST also offers 4 different rotors for environments with special requirements; during pharmaceutical manufacturing, in the plastics industry, the manufacture of food and confectionery, the automotive industry, and others.

19-90 kg/h Dehumidifying capacity at 20°C / 60%RH.

Consorb CZ

The Consorb principle is normally used at low regeneration temperatures, e.g. if you have surplus heat or when dehumidifying very damp air.

CZ-82, CZ102, CZ102L and CZ104
CZ Consorb units are suitable for high ambient water contents

CZ-82 3.200 m³/h 21 kg/h, CZ-102 5.200 m³/h 36 kg/h, CZ-102L 7.200 m³/h 50 kg/h and CZ-104 8.000 m³/h 65 kg/h Dehumidifying capacity at 20°C / 60%RH.

Flexisorb

The Flexisorb-series are user friendly dehumidifiers with countless applications. No additional cooling system is required as the Flexisorb unit provides both dry and chilled moisture content control. The Flexisorb series is developed mainly for the processing industry, chemical industry as well as other applications with the need for a regulated moisture content.

Examples of applications are in the confectionary industry, pharmaceutical industry and underground construction projects. The patented Frigosorb series is especially suited for applications where it is difficult to extract the moisture from the dehumidified room for example with underground construction projects. Owing to the PLC-control the user can have full control over the relative moisture and temperature in the room or construction area. It is possible to receive notification via an SMS from the dehumidifier if for example the set temperature level is exceeded.

Humidistats and Energy Saving for Dehumidifiers

DST offers everything from simple hygrostats to PLC-based moisture and temperature control. In most cases, if dehumidification installations are controlled well, you get a very short pay-off time in return. The Energy-saving brochure takes a look at control systems carefully adapted to suit the DST range of dehumidifiers. All variants are available fully assembled and tested. Investing in a good control system can result in considerable reductions in operating costs. At the same time, you are helping to preserve our environment – an important consideration if you hold environmental accreditation, or are thinking of applying for it.

One supplier

The process industry often makes stringent demands of climate – precise regulation is the name of the game. DST offers a number of systems to control both moisture and temperature. This means that you can avoid having to coordinate a number of installations: these will all be optimised and provided by one supplier.

Energy savings – three stages

Three DST control system stages are available. Stage one has been developed to cover smaller dehumidifiers. Stage two has been developed primarily for electricity and gas regenerated dehumidifiers, while stage three is mainly for steam and hot water regenerated dehumidifiers

• EH3 Humidistat
• EH4 Humidistat
• Energy Saving & Humidity Control

EH3 Humidistat and Controller

• Relative humidity % RH
• Absolute humidity g/kg
• Dew-point °Cdp
• Temperature °C / K / °F

Two closing contacts: Possible to choose source from one of the four parameters above to each relay. Used for controlling one dehumidifi er in two steps or to control two separate dehumidifi ers. Can also be used for dehumidifying on one relay and tem pe ra tu re control on the other.

Display and diodes: 2 row display where two parameters can be monitored. Green “Normal” LED and red “Alarm” LED, switches at a set value of any of the four parameters.

Analogue outputs: 2 outputs with Vdc or mA, choose source from the PI-regulator or one of the four pa ra me ters above.

PI – regulator: Controls energy-saving on a three phase dehumidifier or a valve for a cooling coil. Set relative humidity, absolute humidity, dew-point or temperature and EH-3 will keep it constant.

Sensor: Capacitive type moisture sensor from Honeywell with an accuracy of <±2%RH and <±0.5° C. Each sensor comes with a calibration protocol

EH4 Electronic Humidistat

• Two step humidistat with fast response sensor
• Two independent volt-free control relays
• Visible "High RH" alarm
• Now also for humidification

Two closing contacts: Two independently programmable relays with adjustable hysteresis. Possible to use for both dehumidification and humidification. Suitable for Hi/Lo/Off control of one unit, On/Off control of two separate unit or On/Off control of one unit plus remote high/low RH alarm.

Display and diodes: High visibility RH display (15 mm). Neon lamps indicate relay operation. Display fl ashes if ‘High RH’ set point is exceeded. 

Sensor: Honeywell fast response capacitive type moisture sensor. Factory calibrated (accuracy < ±2%RH).

Optional: available for wall or duct mounting. 

Energy Saving & Humiditiy Control for Dehumidifiers

Energy Saving, step 1

A two-step hygrostat, e.g. EH-3, initially regulates down to approx. half capacity, then in the second stage it regulates down to zero. 

Energy Saving, step 2

A control system regulates the dehumidification capacity from zero up to full capacity by regulating the regeneration heater, in binary or linear fashion, depending on the unit and the type of heater (electricity, steam or gas). The moisture sensor controls the heater by means of a regulator. In other cases, the moisture sensor supplied is fitted externally and wired to the distribution box for the dehumidifier.

Energy Saving, step 3

The system regulates the dehumidification capacity from around 20% up to 100%. Wet air flow, rotation rate of the rotor (in some cases) and the heater’s power output are regulated in parallel, resulting in better utilisation of energy compared with simply regulating the heater. A moisture sensor controls the wet air flow and, in some cases, the rotor speed, via a regulator. The regeneration temperature is maintained at a high level which ensures more efficient dehumidification. 

Alternatively, the dehumidifier can be controlled by an external regulator which emits a 0-10 V signal to the dehumidifier.