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Our YG-RLM(L)-15-40 ultrasonic heat meter is an intelligent, high-accuracy thermal energy measurement solution engineered for heating supply operators, HVAC project contractors, commercial building operators, and industrial energy management enterprises. Based on advanced ultrasonic measuring technology, the meter calculates released or absorbed thermal energy by synchronously collecting flow volume data from the ultrasonic flow sensor and temperature difference data from the paired Pt1000 temperature sensors. It supports measurement units of kWh or Gcal, and complies with EN 1434 Class B and CJ128 Class 2 metering standards. Available in DN15 to DN40 diameters, the meter features no moving measuring parts, low starting flow, and a 10+ year service life, making it the optimal choice for stable, long-term thermal and cooling energy metering in heating, ventilation, and air conditioning systems. We also provide full OEM/ODM customization for bulk project procurement and system integration needs.
This Class 2 ultrasonic energy meter delivers industry-leading metering stability with a 100×1 flow range ratio, a minimum starting flow rate as low as 0.012 m³/h, and a minimum measurable temperature difference of 3℃. It is immune to external magnetic field interference, with a measurement accuracy that remains consistent over long-term operation, fully meeting the strict billing requirements of district heating and commercial cooling projects.
Unlike traditional mechanical heat meters, this ultrasonic thermal energy meter has no moving parts inside the flow measurement chamber, eliminating mechanical wear and ensuring no accuracy attenuation over the service life. Equipped with a low-power intelligent circuit and high-capacity battery, it delivers a service life of over 10 years, drastically reducing on-site maintenance and replacement costs for large-scale projects.
The meter supports both horizontal and vertical installation in pipelines, with no strict straight pipe section requirements, making it suitable for complex on-site installation environments. It can measure both heating and cooling energy, and can be installed on either the return or supply water pipeline. With a working temperature range of 4℃ to 95℃ and a maximum working pressure of 1.6MPa, it adapts to diverse heating and cooling system scenarios.
This M-BUS ultrasonic heat meter comes standard with M-BUS communication, with RS-485 protocol optional, enabling seamless integration with building automation systems, district heating management platforms, and smart energy monitoring systems. It intelligently records cumulative energy consumption and flow data, supporting centralized remote monitoring and data analysis for facility management teams and heating supply operators.
Models and Specifications
Model | Qn(m3/h) | Length(mm) | DN(mm) | Sensor length | Display | Romote | Class |
RLM(L)-15-0.6 | 0.6 | 110 | 15 | 1.5m | kw/h | M-BUS | 2 |
RLM(L)-15-1.5 | 1.5 | 110 | 15 | 1.5m | kw/h | M-BUS | 2 |
RLM(L)-20-2.5 | 2.5 | 130 | 20 | 1.5m | kw/h | M-BUS | 2 |
RLM(L)-25-3.5 | 3.5 | 160 | 25 | 1.5m | kw/h | M-BUS | 2 |
RLM(L)-32-6.0 | 6.0 | 180 | 32 | 1.5m | kw/h | M-BUS | 2 |
RLM(L)-40-10 | 10 | 200 | 40 | 1.5m | kw/h | M-BUS | 2 |
Normal Flow(Qn) | 0.6m3/h | 1.5m3/h | 2.5m3/h |
Flow range(m3/h) | 0.012~1.2 | 0.03~3 | 0.05~5 |
Pressure loss(KPa/Qp) Reference diagram I | 24 | 24 | 24 |
Max. Pressure(MPa) | 1.6 | ||
Temperature range(℃) | 4~95 | ||
Pressure Loss Diagram:
Normal flow(Qn) | m3/h | 0.6 | 1.5 | 2.5 | 3.5 | |||
Normal DN | mm | 15 | 15 | 20 | 25 | |||
Body thread | ---- | G3/4”B | G3/4”B | G1”B | G1 1/4”B | |||
Connection thread | ---- | 1/2” | 1/2” | 3/4” | 1" | |||
Height | mm | 115 | 115 | 105 | 110 | |||
Length | mm | 110 | 110 | 130 | 160 | |||
Temperature sensor pair
Temperature sensor pair PT1000 meets Norm. DIN EN60751
Sensor is soldered on PCA. The length of sensor lead is 1.5m. (Optional 3m, 10m)
Diameter of sensor is Ф5.0mm（optional Ф5.2mm ）
Mounting for heat meters:
Heat system pipeline( see photo 3 as reference)
This Pt1000 ultrasonic heat meter is widely applicable for B-end scenarios including district heating and cooling supply networks, commercial and residential HVAC system projects, industrial thermal energy consumption management, energy conservation and emission reduction retrofit projects, building automation systems, and centralized billing for multi-tenant commercial properties. It is also the preferred solution for energy service companies carrying out energy audit and efficiency optimization projects.
The meter comes standard with M-BUS communication for remote data transmission, with RS-485 protocol available as an optional configuration to fit different system integration requirements.
Yes, this dual-function meter supports both heat and cold energy measurement, and can be installed on either the return or supply water pipeline, making it suitable for both heating systems and central air conditioning cooling systems.
With an optimized low-power circuit design and high-capacity industrial-grade battery, the meter has a continuous service life of over 10 years under normal working conditions, minimizing on-site maintenance needs.
Yes, this EN 1434 Class B heat meter fully meets the requirements of EN 1434 European standard and CJ128 Chinese industry standard, ensuring compliance with global thermal energy metering regulations.
