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. PLCs (C2 and C4) are tailored to ensure the highest operating efficiency is achieved for each specific project. PLCs can be used independently, with one of our digital controllers (EH3 & 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 capacity to maintain required humidity, temperature or airflow
DST offers a number of systems that control both humidity and temperature. This means you do not need to coordinate multiple installations – everything is supplied optimized, from a single supplier.
DST’s entry-level PLC type C2 is fitted as standard to all our 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 T2 & EH4) or an external controller (BMS), the dehumidifier drying capacity can be finely tuned to accurately maintain the required set point.
The PLC C4 is easy to use thanks to the user-friendly touch screen. The user 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 the internet. The C4 also offers great expansion possibilities since it is easy to add on different functions. All functions are tested by DST at the factory before delivery.
EH3 T2, Electronic humidistat and regulator
EH4, electronic humidistat
The reactivation heater 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.
A temperature sensor attached to the coldest surface is paired with a room humidity sensor. Our EH3 T2 simultaneously monitors the 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 the least possible energy is consumed.
Integrating output temperature control in the dehumidification process makes it possible to reduce the total energy consumption thanks to the interaction of humidity and temperature parameters. Cooling and heating coils are built into the dehumidifier. DST is able to offer both DX cooling and coils for chilled water. Heating can be done with either hot water, electricity, or steam heating.
Modbus communication via TCP/IP or RTU gives the actual values for temperature and humidity, the possibility to start/stop the dehumidifier as well as alarm readouts and operation indicators.
PLC C4 can be mirrored locally on one or more computers via a network connection.
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