The CALEC® ST II is a multi-functional thermal energy calculator designed for use in district heating and building technology. Here are its key features and technical specifications:

**Key Features:**

1. **Precise Energy Measurement:** The CALEC® ST II is designed to provide precise energy measurement for all thermal applications in district heating or building technology.

2. **Smart Metering:** It enables smart metering, making it suitable for advanced energy management and monitoring.

3. **Heating and Cooling Measurement:** The device is capable of measuring both heating and cooling energy consumption, providing versatility for various applications.

4. **Choice of Fuel:** Users have the flexibility to choose their preferred type of fuel for energy measurement.

5. **Versatile Applications:** The CALEC® ST II can be used for various applications, including heating, air conditioning, refrigeration, and systems with thermal alternative energy sources.

6. **Modularly Expandable:** The device is modularly expandable, allowing for the addition of extra features or capabilities as needed.

7. **Optimal System Integration:** It is designed for optimal integration into existing systems, ensuring seamless operation within the broader infrastructure.

8. **Easy Installation:** The device offers plug-and-play installation, simplifying the setup process.

**Technical Data:**

– **Flow Meter Compatibility:** Compatible with all standard flow meters that use a pulse output.

– **Display Module:** Features a plug-in computer module with an LCD display for easy visualization of data.

– **Power Supply:** Can be powered by either 24 VDC or 230 VAC.

– **Temperature Sensors:** Compatible with Pt100 or Pt500 temperature sensors, supporting 2- or 4-wire configurations, with a maximum cable length of 100 meters for 4-wire setups.

– **Temperature Range:**
– Medium Temperature: 0°C to 200°C (-40°C to 180°C for special heat transfer fluids).
– Temperature Difference: 0K – 190K (with various approval levels).

– **Resolution:** Provides 20-bit resolution with typical accuracy of +/- 0.005K.

– **Display Units:** Users can choose from various display units for convenient data presentation.

– **Data Logger:** Supports data logging with storage for up to 500 records.

– **Calculation Cycle:** Operates with a 1-second calculation cycle for real-time data processing.

– **Flow Meter Power Supply:** Offers two power supply options – 24V or 3.6V – for the flow meter.

– **Communication Interfaces:** Equipped with a range of communication interfaces, including M-Bus, LON, BacNet, ModBus, KNX, N2 Open, LoRaWAN, and analog outputs.

– **Heat Transfer Media:** Pre-programmed with 11 different heat transfer media options (optional).

– **Metrological Approval:** Complies with the standards of the European Measuring Instruments Directive (MID) 2014/32/EU and PTB K 7.2.

– **Dimensions:** The device’s dimensions are 120mm x 163mm x 49mm, making it compact and suitable for various installation settings.

The CALEC® ST II is a versatile and highly adaptable thermal energy calculator suitable for applications in district heating and building technology. Its precise measurements, flexibility in choice of fuel, and extensive communication interfaces make it a powerful tool for energy management and optimization.