FlowT Ultrasonic BTU Meter
Measure Flow, Temperature Difference and Thermal Energy in One System
The FlowT Ultrasonic BTU Meter is designed for heating, cooling and HVAC energy measurement where engineers need to know not only how much water is flowing, but how much thermal energy is being transferred through the system.By combining transit-time ultrasonic flow measurement with PT1000 temperature sensors on the supply and return lines, the system calculates real-time heating or cooling energy based on flow rate and temperature difference.
For clamp-on configurations, flow measurement can be added to suitable existing pipelines without cutting the pipe, making the system particularly useful for chilled-water plants, HVAC retrofits, district cooling, commercial buildings and industrial energy monitoring.
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Ultrasonic flow and thermal energy measurement
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PT1000 supply and return temperature measurement
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Heating and cooling energy calculation
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Clamp-on configuration for retrofit projects
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4–20mA, pulse, relay and RS485 options
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BMS and energy-management system integration
A standard flow meter tells you how much liquid is moving through a pipeline.
An ultrasonic BTU meter goes one step further by combining flow rate with the temperature difference between the supply and return lines to determine how much thermal energy is being transferred.
The complete measurement normally includes three key inputs:
Ultrasonic Flow Measurement
The ultrasonic flow meter measures liquid velocity and volumetric flow inside the pipeline.
Supply Temperature
A temperature sensor measures the fluid temperature entering the heating or cooling load.
Return Temperature
A second temperature sensor measures the fluid temperature after thermal energy has been added or removed.
The BTU meter combines these values to calculate thermal power and accumulated energy consumption.
This makes the system suitable for HVAC performance monitoring, energy allocation, chilled-water management and heating or cooling system analysis.
Discuss Your Energy Measurement Requirement
What Makes Up an Ultrasonic BTU Meter System?
Ultrasonic Flow Transmitter
The transmitter receives ultrasonic flow signals, calculates flow rate and processes the temperature inputs required for energy measurement.
Ultrasonic Transducers
For clamp-on configurations, the ultrasonic transducers are mounted externally on the pipe and measure liquid flow using transit-time technology.
PT1000 Temperature Sensors
Two PT1000 temperature sensors measure the supply and return water temperatures.
Accurate temperature-difference measurement is particularly important when the ΔT between the two pipes is small.
Temperature Sensor Installation Points
One sensor is installed on the supply side and the second on the return side of the same thermal-energy circuit.
Signal and Communication Outputs
Depending on the selected configuration, measured flow and energy data can be transmitted to external monitoring systems.
BMS / EMS Integration
Digital and analog interfaces allow the BTU meter to become part of a wider Building Management System or Energy Management System.
Ultrasonic BTU Meter vs. Ultrasonic Flow Meter
| Measurement | Ultrasonic BTU Meter | Ultrasonic Flow Meter |
|---|---|---|
| Flow Rate | Yes | Yes |
| Flow Totalization | Yes | Yes |
| Supply Temperature | Yes | Normally not part of standard flow measurement |
| Return Temperature | Yes | Normally not part of standard flow measurement |
| Temperature Difference | Yes | No |
| Thermal Power | Yes | No |
| Heating Energy | Yes | No |
| Cooling Energy | Yes | No |
| HVAC Energy Monitoring | Primary application | Flow monitoring only |
| BMS Integration | Available by configuration | Available by configuration |
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Ultrasonic BTU Meter |
| Brand | FlowT |
| Reference Model | FT201 |
| Measurement Principle | Transit-Time Ultrasonic |
| Flow Sensor Installation | Clamp-On configuration available |
| Thermal Measurement | Heating / Cooling Energy |
| Temperature Sensors | PT1000 |
| Pipe Size | DN25–DN6000 |
| Flow Accuracy | Better than ±1.0% under applicable conditions |
| Flow Velocity | Approximately 0 to ±10 m/s |
| Medium Temperature | -30°C to 160°C depending on sensor/configuration |
| Output | 4–20mA, OCT, Relay |
| Communication | RS485 |
| Power Supply | DC8–36V or AC85–264V |
| Bidirectional Measurement | Supported by applicable configuration |
| Energy Calculation | Based on flow and temperature difference |
| Clamp-On Installation | Available |
| OEM / OBM Support | Available |
| Warranty | 1 year according to current FlowT product listing |
| Calibration | Project calibration support available |
| BMS Integration | Available according to communication configuration |
FAQ
What is an ultrasonic BTU meter?
An ultrasonic BTU meter measures thermal energy transferred through a heating or cooling water system.It combines ultrasonic flow measurement with supply and return temperature measurements to calculate thermal power and accumulated energy.
How does an ultrasonic BTU meter work?
The flow meter measures liquid flow using ultrasonic technology, while two temperature sensors measure the supply and return temperatures.The system combines flow rate with temperature difference and fluid thermal properties to calculate heating or cooling energy.
What is the difference between an ultrasonic flow meter and an ultrasonic BTU meter?
An ultrasonic flow meter measures flow.An ultrasonic BTU meter measures flow plus supply and return temperatures so that thermal energy can also be calculated.
Is a BTU meter the same as a heat meter?
The terms overlap significantly."BTU meter" is commonly used in HVAC and cooling applications, while "heat meter" or "thermal energy meter" is also widely used for heating and district-energy systems.
Can FlowT measure cooling energy?
Yes.An ultrasonic BTU meter can calculate cooling energy using chilled-water flow together with supply and return temperatures.
Can it measure heating energy?
Yes.The same measurement principle can be used for suitable hot-water heating systems.
Does a clamp-on BTU meter require pipe cutting?
The external ultrasonic flow transducers do not require pipe cutting.
The temperature-sensor installation method depends on the selected configuration and project design.
What temperature sensors are used?
FlowT's current FT201 BTU-related configuration specifies PT1000 temperature sensors. FlowT Instrument (Shenzhen) Limited
What pipe sizes are available?
FlowT's current FT201 BTU-related product page lists DN25 to DN6000.Final transducer selection should be confirmed according to the actual pipe and application. FlowT Instrument (Shenzhen) Limited
What is the flow measurement accuracy?
The current FlowT FT201 BTU-related product listing specifies flow accuracy better than ±1.0% under applicable conditions.Installed results depend on pipe data, flow profile and transducer installation. FlowT Instrument (Shenzhen) Limited
Can it measure glycol-water mixtures?
Suitable glycol-water systems can be evaluated, but the correct fluid type and glycol concentration should be configured because fluid thermal properties affect energy calculations.
Why is ΔT important?
Thermal-energy calculation depends on the difference between supply and return temperature.The same flow rate can represent very different energy transfer when the temperature difference changes.
Can the meter connect to a BMS?
The current FlowT FT201 BTU-related configuration includes RS485 and industrial output options.Provide your BMS protocol and point requirements before quotation. FlowT Instrument (Shenzhen) Limited
Can it output 4–20mA?
FlowT's current product listing includes 4–20mA output together with OCT and relay options.Final output assignment should be confirmed according to the selected configuration. FlowT Instrument (Shenzhen) Limited
Can FlowT provide calibration documentation?
FlowT supports real-flow calibration and project test documentation.
If your HVAC or energy project requires a specific certificate or test format, specify the requirement before ordering.
Do you support OEM/ODM?
Yes.FlowT supports OEM/ODM discussions for qualified HVAC contractors, system integrators, distributors and project buyers.
Need an Ultrasonic BTU Meter for Your HVAC System?
Send FlowT your flow and temperature conditions before selecting the final configuration.
Our technical team can review pipe size, flow range, fluid type, supply temperature, return temperature, expected ΔT and BMS requirements to help configure the ultrasonic flow transducers, PT1000 temperature sensors and communication interface for your project.
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