World leaders in dehumidification.
Energy Saving –
Reduce the carbon
footprint of the
dehumidifier
ENERGY EFFICIENT CONTROL
ECONOMICAL AND ENVIRONMENTALLY FRIENDLY
With new government efficiency targets and ever-increasing energy prices, it is DST’s policy to
use new technologies wherever possible. This ensures that our products continue to use energy
effectively and efficiently. Our programmable logic control (PLC) systems can increase operating efficiency, lower carbon emissions and reduce running costs; factors that may be crucial for
environmental certification.
PLC’s are tailored to ensure highest operating efficiency is achieved for each specific project. PLC’s can be used
independently, with one of our digital controllers (EH3 T2 & EH4) or interlinked with a building management system (BMS).
The primary functions of the PLC are to:
Provide a user friendly interface
Synchronize the operation of key components
Monitor protection devices, trips and alarms
Adjust unit c
apacity to maintain required humidity, temperature and airflow
One supplier
DST offers a number of systems which controls both humidity and temperature. This means you do not need to coordinate
multiple installations – everything is supplied optimised, from a single supplier.
PLC for industrial dehumidifiers
DST’s entry level PLC type C2 is fitted as standard to our larger
industrial dehumidifiers. A user friendly keypad allows easy access
to the menu options and a two-row backlit LCD screen displays
important messages to the user. Used in conjunction with one of
our humidity controllers, EH3 or EH4, or an external controller, BMS,
the dehumidifier drying capacity can be finely tuned to accurately
maintain the required set point.
PLC C2:1 In/Outputs
Digital Inputs: 9
Digital Outputs: 7
Analogue Inputs: 4
Analogue Outputs: 2
PLC C2:1 Features
A two row text display
Standard PLC for DST
dehumidifiers type RZ,
RLZ, CZ and Flexisorb
PLC C2:1
Energy Saving 1
The reactivation heate
r power output is regulated in two steps.
Our humidity controller EH3 T2 or EH4 adjusts the drying capacity
between High, Low & Off, as required to maintain the humidity (or
dew point) between two programmable set points.
Applications:
Where precise control is not required
Where process air is fully recirculated
Dehumidifier capacity control is achieved by
regulating the reactivation heater power
Energy Saving 2
The reactivation heater power is fully regulated between
zero and full capacity using linear (solid state relay or actuator)
control. Using our humidity controller EH3 T2 + PLC C2 or an
external control signal (BMS + PLC C2), the drying capacity is
finely adjusted to accurately maintain the required set point
(humidity or dew point).
Applications:
Where precise control is required
Where the process air inlet condition is constantly changing
Where a specific dry air outlet condition is required
On large dehumidifiers to save energy
Rotor rotation guard is included in Energ
y Saving 2
Energy Saving 3
Used on steam reactivated dehumidifiers only, the reactivation
air fan is regulated between 20% and full flow using a motor
frequency inverter. The reactivation temperature is maintained at
a high level. Using our humidity controller EH3 T2 +
PLC C2 or an external control signal (BMS + PLC C2), the drying
capacity is finely adjusted to accurately maintain the required set
point (humidity or dew point).
Applications:
When using a steam reactivated dehumidifier
Where precise control is required
Where the process air inlet condition is constantly changing
Where a specific dry air outlet condition is required
Steam flow automatically adjusts to a change in air flow.
Rotor rotation guard is included in Energy Saving 3
Preventing condensation and corrosion using EH3 T2
A temperature sensor attached to the coldest surface is paired with a room humidity sensor. Our EH3 T2 simultaneously
monitors surface temperature, relative humidity and dew point of the room air
.
Our humidity controller EH3 T2 accurately adjusts the drying capacity to maintain the required RH set point. Should the air
dew point exceed the monitored surface temperature, EH3 T2 will automatically override the RH set point, increasing its
control output to the dehumidifier.
EH3 T2 regulates the drying capacity to control both RH and dew point while ensuring least possible energy is consumed.
Humidity ratio g/kg
T, °C 0
40 % 4%
5
10%
10
20%
15%
15
20
30%
30
25
60%
50%
40%
30
25
20
15
10
5
0
-5
-10
70%
80%
90%
100%
35
-5
0
5
10
15
20
25
30
35
40
45
50
lpy
tha
En
55
60
65
70
g
/k
KJ
Below 50%RH
75
80
85
90
95
100
Control the
humidity along
the orange line
Below the dew-point
of the cold water pipe
CONTROL HUMIDITY AND
TEMPERATURE
The PLC C4 and C7 can easily overview and manage the process of controlling both humidity and temperature. The user
may also set regulator values and view the process-data. It is possible to manage the start-up
process, control, see the
functions as well as start and stop the dehumidifier via internet. The PLC’s also offers great expansion possibilities since it is
easy to add on different functions.
C4 and C7
For advanced RL, RLZ, CZ and Flexisorb unit control
Graphic touch display, C4 with 5.7” and C7 with 7”
Communication via Modbus RTU or TCP/IP, Remote Access*
or BACnet. C7 also have communicaition with Profibus
Cost-effective process control online
Communication through Ethernet or Modem**
PLC C4 with graphic touch display, 5.7”. Advanced
PLC control with great expansion options
C4 In/Outputs
Digital Inputs: 16
Digital Outputs: 16
Analogue Inputs: 4
Analogue Outputs: 4
Modbus TCP/IP, RTU or
Remote Access* via Ethernet
C7 In/Outputs
Digital Inputs: 16
Digital Outputs: 16
Analogue Inputs: 4
Analogue Outputs: 4
Modbus TCP/IP, RTU, Remote
Access* via Ethernet or Profibus
* Free software from Seibu Giken DST AB. The panel can be mirrored on
a computer screen.
** Modem can be us
ed when local Ethernet is not available or finewalls stops external communication
PLC C7 with graphic touch display, 7”. Advanced PLC
control and possible to add Profibus communication
CUSTOMER ORIENTED SOLUTIONS
The functions of the C4 and C7 can be adapted in many
different ways to suit the requirements of a customer. For
instance, it is possible to view operating data and alarm logs
online, as well as other settings. Since the PLC can be mirrored
on a computer screen, allowing to control the dehumidifier
via internet, a company can save both personnel resources
and travelling time, which is good from an environmental
standpoint. The software can be updated through a modem
or internet.
REGULATE WITH PLC C4 AND C7
Integrating output temperature control in the dehumidification process makes it possible to reduce the total energy
consumption thanks to interaction of the humidity and temperature parameters. Cooling and heating coils are built into
the dehumidifier. DST is able to o
ffer both DX cooling and coils for chilled water. Heating can be done with either hot water,
electricity or steam heating.
Example of configuration with options
DST provides pre- and post treatment
coils complete with temperature
control, and all from a single supplier.
Contact your nearest DST representative
for further information
Vaisala transmitter connected to C4
Rotor
Fan
Heater
Pilot valve
Cooler
Temp. sensor
Filter
Humidity sensor
Moist warm air passes through the
dehumidifier and is supplied to the factory
as dried and cooled air
Modbus, Profibus or BACnet
Communication via TCP/IP or RTU gives the actual values
for temperature and humidity, possibility to start/stop
the dehumidifier as well as alarm readouts and operation
indicators.
Remote access
PLC C4 and C7 can be mirrored locally on one or more
computers via a network connection.
You can communicate with and control your dehumidifier
without actually being present. This saves time, money and
personnel resour
ffer both DX cooling and coils for chilled water. Heating can be done with either hot water,
electricity or steam heating.
Example of configuration with options
DST provides pre- and post treatment
coils complete with temperature
control, and all from a single supplier.
Contact your nearest DST representative
for further information
Vaisala transmitter connected to C4
Rotor
Fan
Heater
Pilot valve
Cooler
Temp. sensor
Filter
Humidity sensor
Moist warm air passes through the
dehumidifier and is supplied to the factory
as dried and cooled air
Modbus, Profibus or BACnet
Communication via TCP/IP or RTU gives the actual values
for temperature and humidity, possibility to start/stop
the dehumidifier as well as alarm readouts and operation
indicators.
Remote access
PLC C4 and C7 can be mirrored locally on one or more
computers via a network connection.
You can communicate with and control your dehumidifier
without actually being present. This saves time, money and
personnel resour
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