Description
Electronic Constant Temperature Controllers for Heating and Cooling Systems
The Clorius ER 2022, ER 2022A, ER 2025S and ER 2025SA are electronic temperature controllers designed for constant-temperature control in heating and cooling systems.
The controllers are primarily intended for marine installations and industrial applications, including cooling-water systems, lubricating-oil systems and flow-temperature control. The ER 2025S and ER 2025SA additionally provide functions such as remote setpoint adjustment, program control, manual operation and limit-value monitoring.
1. Constant Temperature Control
The main purpose of the ER controller is to maintain a selected temperature at a controlled point.
A typical control loop is:
Temperature Sensor → ER Controller → Actuator → Control Valve → Process
The controller receives the actual temperature from a Pt100 sensor, compares it with the configured setpoint and adjusts the actuator output accordingly. The ER 2025S/2025SA supports PI or PID control structures.
This makes the controller suitable for applications where stable temperature regulation is important.
2. Heating and Cooling Applications
The ER controller can operate as either a heating controller or a cooling controller.
Heating Control
When the measured temperature rises, the controller can command the actuator to close, reducing the heating-medium flow.
Cooling Control
When the measured temperature rises, the controller can command the actuator to open, increasing the cooling-medium flow.
The ER 2025S and ER 2025SA can therefore be configured according to the required process-control philosophy.
3. Pt100 Temperature Sensor
The temperature input is provided through a Pt100 sensor with a single sensing element.
The controller continuously measures the process temperature and compares the measured value with the selected setpoint.
This allows the system to automatically compensate for changes in process temperature.
A simplified arrangement is:
Pt100 Sensor
│
▼
┌──────────────┐
│ Clorius ER │
│ Controller │
└──────┬───────┘
│
▼
Actuator
│
▼
Control Valve
│
▼
Heating/Cooling
System4. ER 2022 and ER 2022A
The ER 2022 and ER 2022A are the analog versions of the ER controller family.
They are designed for constant-temperature control in heating and cooling applications.
The ER 2022/2022A is particularly suitable where a straightforward temperature-control solution is required without the additional user-interface functions of the Smart versions.
Clorius specifies both versions for applications such as:
- Cooling-water temperature control
- Lubricating-oil temperature control
- Flow-temperature control
- Heating systems
- Cooling systems
- Industrial temperature regulation
5. ER 2025S – Smart Controller
The ER 2025S adds a more advanced user interface and control functionality.
The controller features:
- Two LCD displays
- Pixel-matrix LCD display
- Four-button membrane keypad
- Manual mode
- Program controller
- Limit-value monitoring
- Digital control signals
- PI/PID control
- Pt100 input
- Error monitoring
- Configurable outputs
The display provides process values, parameters, menu information and text-based operating information.
6. ER 2025SA – Smart Analog Controller
The ER 2025SA combines the Smart controller functionality with an analog output configuration.
It is designed for constant-temperature control and can be used where an analog control signal is required.
The ER 2025S and ER 2025SA are therefore particularly useful where the temperature controller needs to be integrated into a more sophisticated control system.
7. Smart User Interface
One of the major differences between the ER 2025S/2025SA and the simpler ER 2022/2022A versions is the user interface.
The ER 2025S/2025SA includes:
- 18-segment LCD display
- Additional display for process/setpoint information
- Pixel-matrix LCD
- Menu-based operation
- Four-button membrane keypad
- Output-status indication
- Manual-mode indication
This makes commissioning and adjustment easier because operating parameters can be viewed directly on the controller.
8. Manual Mode
The ER 2025S/2025SA includes a manual operating mode.
In manual mode, the operator can directly adjust the output level.
For a three-point controller, the actuator can be gradually:
- Opened
- Closed
using the controller’s buttons. Manual mode can also be controlled through a digital signal.
This can be useful during:
- Commissioning
- Testing
- Maintenance
- Troubleshooting
- Emergency operation
9. Remote Setpoint Function
The ER 2025S/2025SA supports applications where a remote setpoint function is required.
This can be useful in industrial installations where the desired temperature may need to be adjusted from another control point rather than directly at the controller.
For example:
Central Control System → Remote Setpoint → ER Controller → Valve Actuator
This provides additional flexibility for automated temperature-control systems.
10. Limit Value Monitoring
The ER 2025S/2025SA includes limit-value monitoring functions.
These functions can be used to monitor whether measured process values remain within configured limits.
This is particularly useful for industrial systems where temperature deviations need to generate an alarm or initiate a defined control response.
11. Sensor Failure Protection
The ER 2025S/2025SA provides monitoring of the temperature measurement circuit.
In the event of a:
- Pt100 short circuit
- Pt100 sensor break
the controller can be configured to command the actuator to:
- Close
- Open
- Remain in its current position
The controller also displays an “Err” message when a measurement-circuit error occurs.
This is an important feature for critical temperature-control applications.
12. Applications in Cooling Water Systems
One of the applications specifically identified by Clorius is cooling-water temperature control.
The ER controller can be combined with a Clorius control valve and actuator to regulate cooling-water flow.
A typical arrangement is:
Cooling Water → Control Valve → Heat Exchanger → Return
The Pt100 sensor measures the controlled temperature and the ER controller adjusts the valve position to maintain the required temperature.
This principle can be applied to:
- Cooling-water systems
- Heat exchangers
- Machinery cooling
- Industrial cooling circuits
- Marine cooling systems
13. Lubricating Oil Temperature Control
Clorius also identifies lubricating-oil installations as an application.
Temperature control is important for lubricating-oil systems because excessive temperature or insufficient temperature can affect equipment operation.
The ER controller can regulate the associated heating or cooling system to maintain the desired oil temperature.
Typical applications may include:
- Marine machinery
- Engines
- Industrial equipment
- Lubricating-oil coolers
Clorius specifically lists lubricating-oil installations among the intended industrial applications.
14. Flow Temperature Control
The ER controller can also be used for flow-temperature control.
For example:
Heating Medium → Control Valve → Heat Exchanger → Controlled Flow
The Pt100 sensor measures the outlet temperature and the controller adjusts the valve to maintain the desired setpoint.
This makes the ER controller suitable for various hydronic and industrial heat-transfer systems.
15. Marine Applications
The ER controller family is primarily intended for marine installations and other industrial applications.
Marine applications can include:
- Cooling-water systems
- Lubricating-oil systems
- Machinery cooling
- Heat exchangers
- Flow-temperature control
The compact panel-mounted design allows the controller to be installed directly into a control cabinet or panel.
16. Control Valve Integration
The ER controller is intended to work as part of a complete temperature-control system.
A typical Clorius solution consists of:
Pt100 Sensor
↓
ER Temperature Controller
↓
Clorius Actuator
↓
Clorius Control Valve
↓
Heating / Cooling System
This allows the controller, actuator and valve to work together as a complete temperature-regulation package.
17. Panel-Mounted Design
The controller is designed for control-panel installation.
Clorius specifies the following dimensions:
96 × 96 × 65 mm
The required panel cut-out is approximately:
92 × 92 mm
The product page specifies a weight of approximately:
0.22 kg
and a horizontal installation arrangement.
For the ER 2025S/2025SA manual, the panel cut-out is specified as 92 +0.8 × 92 +0.8 mm according to DIN IEC 61554.
18. Electrical Supply
The product page specifies:
110–240 VAC
with a tolerance of:
-15% / +10%
and frequency:
48–63 Hz.
The current ER 2025S/2025SA manual also identifies versions with 20–30 V AC/DC or 110–240 VAC, 48–63 Hz, depending on the device version/order configuration.
Therefore, the actual nameplate and ordered configuration should be checked before electrical installation.
19. Protection and Industrial Environment
The ER 2025S/2025SA is designed for industrial environments and provides a front-side protection rating of IP65 when correctly installed with the required seal.
The controller is intended for installation in a closed switch cabinet/control panel.
However, the controller is not designed for potentially explosive areas.
This point is particularly important when considering the controller for industrial or marine projects.
20. ER 2022 vs. ER 2025S
| Feature | ER 2022 / ER 2022A | ER 2025S / ER 2025SA |
|---|---|---|
| Constant temperature control | Yes | Yes |
| Heating control | Yes | Yes |
| Cooling control | Yes | Yes |
| Pt100 input | Yes | Yes |
| Smart display | No/limited | Yes |
| Text-based display | No | Yes |
| Manual mode | Depends on version | Yes |
| Program controller | No | Yes |
| Limit monitoring | Basic | Yes |
| Digital control signals | Limited | Yes |
| PI/PID control | — | Yes |
| Remote setpoint | — | Yes |
| Sensor failure response | — | Configurable |
The ER 2025S/2025SA therefore provides a more advanced control and user-interface platform than the basic ER 2022/2022A family.
21. Data Center Applications
Although Clorius specifies the ER 2022/2025 family primarily for marine and industrial applications, the constant-temperature control principle can also be relevant to selected data-center cooling infrastructure.
Potential applications include:
- Cooling-water temperature control
- Heat-exchanger control
- Auxiliary cooling circuits
- Equipment cooling
- Secondary cooling loops
- Liquid-cooling support systems
A possible arrangement is:
Cooling Water
│
▼
Control Valve
│
▼
Heat Exchanger
│
▼
Cooling Circuit
│
Pt100
│
▼
ER Controller
│
▼
Actuator
│
└──────────► Control ValveFor data-center projects, however, actual suitability must be checked against the required control architecture, sensor type, actuator signal, operating temperature, flow rate and BMS requirements.
22. Why Choose Clorius ER Controllers?
Precise Temperature Control
The controller continuously compares measured temperature with the setpoint and regulates the actuator.
Heating and Cooling Capability
The same controller concept can be configured for either heating or cooling operation.
PI/PID Control
The ER 2025S/2025SA supports PI and PID control structures for process regulation.
Industrial Applications
The product is specifically intended for marine and industrial temperature-control applications.
Advanced Monitoring
The Smart versions provide display functions, limit monitoring and error indication.
Sensor-Failure Response
The controller can be configured to define actuator behavior following Pt100 sensor failure.
Compact Panel Installation
The 96 × 96 mm front-panel format makes the controller suitable for conventional control panels.
Technical Specifications
| Attribute | ER 2022 / ER 2022A / ER 2025S / ER 2025SA |
|---|---|
| Brand | Clorius Controls |
| Product Type | Electronic Temperature Controller |
| Main Function | Constant Temperature Control |
| Applications | Heating & Cooling |
| Sensor | Pt100 |
| Control | PI / PID for ER 2025S/SA |
| Power Supply | 110–240 VAC, -15%/+10%, 48–63 Hz* |
| Panel Dimensions | 96 × 96 × 65 mm |
| Panel Cut-Out | Approx. 92 × 92 mm |
| Weight | Approx. 0.22 kg |
| Installation | Control Panel |
| ER 2025S/SA Protection | IP65 front side when correctly installed |
| Manual Mode | Yes, ER 2025S/SA |
| Limit Monitoring | Yes, ER 2025S/SA |
| Program Controller | Yes, ER 2025S/SA |
| Remote Setpoint | Yes, ER 2025S/SA |
| Primary Applications | Marine & Industrial |
*Check the actual ordered version/nameplate because the ER 2025S/SA manual also documents versions with 20–30 V AC/DC or 110–240 VAC.
Conclusion
The Clorius ER 2022, ER 2022A, ER 2025S and ER 2025SA are electronic controllers designed for reliable constant-temperature regulation in heating and cooling systems.
The product family is particularly suited to marine and industrial applications, including cooling water, lubricating oil and flow-temperature control.
The ER 2025S and ER 2025SA provide a more advanced control platform with PI/PID regulation, Pt100 temperature measurement, manual mode, program control, limit-value monitoring, digital signals, remote setpoint functionality and configurable response to sensor failure.
When combined with a Clorius control valve and actuator, the ER controller forms a complete temperature-control loop suitable for a wide range of industrial heating and cooling applications.
