The latest generation of the amount of heat measurement.
The SensoStar U compact meter uses modern ultrasonic technology to deliver highly accurate measurement results in any installation position. The extensive portfolio of brass and premium composite hydraulics covers all common sizes and installation lengths. This allows for maximum flexibility during installation. Temperature sensors with cable lengths of up to 6 meters are also available, making them ideal for challenging installation situations. Whether you need a heat meter, cooling BTU meter, or hybrid (heat/cooling meter), the SensoStar U is the state-of-the-art solution for accurately recording consumption data. The dynamic temperature measurement cycle of 2/60 seconds in battery mode adapts flexibly to temperature fluctuations. This allows the SensoStar U to record even the smallest flows and rapid temperature changes. For increased monitoring requirements, an optional power supply unit for external power supply is available. This shortens the temperature measurement cycle to just 2 seconds. This enables direct monitoring of your system in real time.
The SensoStar U and SensoStar UC are high-precision measuring devices that use ultrasonic measurement
technology to record heat or cooling energy. Whether in brass or composite version – this meter offers the right
solution for every installation situation and every requirement. The comprehensive range covers all installation
lengths, temperature sensor and communication variants.
| Parameter | Specification |
|---|---|
| Environmental class (MID) | C (EN 1434) |
| Mechanical class (MID) | M2 |
| Electromagnetic class (MID) | E2 |
| Parameter | Specification |
|---|---|
| Temperature range (medium) | 0 – 150 °C (heating); 0 – 50 °C (cooling) |
| Ambient temperature (in the field) | 5 – 55 °C at 95% relative humidity |
| Transport temperature | -25 – 70 °C (for max. 168 h) |
| Storage temperature | -25 – 55 °C |
| Temperature difference range ΔΘ (heating) | 3 – 100 K |
| Temperature difference range ΔΘ (cooling) | -3 – -50 K |
| Minimum temperature difference ΔΘ (heating) | > 0.05 K |
| Minimum temperature difference ΔΘ (cooling) | < -0.05 K |
| Minimum temperature difference ΔΘ (heating/cooling) | > 0.5 K / < -0.5 K |
| Temperature resolution | 0.01 °C |
| Measuring cycle | Temperature: Dynamic 2 s / 60 s; with external power supply: continuous 2 s Flow: 2 s |
| Calculator housing dimensions (H × W × D) | 75 × 110 × 34.5 mm |
| Connecting cable length (calculator – flow sensor) | 0.85 m (optional: 2.85 m) |
| Display | LCD – 8 digits + special characters |
| Displayed thermal energy | Up to 3 decimal places |
| Units | MWh, kW, m³, m³/h (kWh, GJ, MMBTU, Gcal); energy unit can be changed while total energy is ≤ 10 kWh |
| Interfaces | Standard: Optical interface (M-Bus protocol, ZVEI according to EN 62056-21)
Optional communication: |
| Power supply | Easily replaceable 3 V lithium battery (A-cell, 0.86 g lithium); Preparation for 3 V power pack available (input voltage 230 V / 24 V) |
| Battery capacity (designed lifetime) | 20 years (without communication module) 16 years (M-Bus, 1-hour readout interval) 15 years (M-Bus, 10-minute readout interval) 10 years (Wireless M-Bus, Modbus, LoRaWAN, etc.) |
| Data storage | 24 monthly and 24 semi-monthly values |
| Billing dates | Freely selectable annual billing date; 15 monthly and 15 semi-monthly values via display or radio (compact mode); 24 monthly and 24 semi-monthly values via optical interface or M-Bus |
| Tariff registers | 2 individually adjustable tariff registers; store energy or time |
| Maximum value storage | Flow, power, inlet temperature, outlet temperature, ΔΘ, and corresponding maximum values of the last 15 months |
| Protection class | IP65 |
| Calming section | U0D0 |
| Approvals | DE-16-MI004-PTB025; DE-16-M-PTB-0097; CH-T2-18768-00; CE |
| Type designation | S3 |
| EMC (MID) | EN 1434 |
