Product Overview
BBUEM-S is a small-pipe clamp-on ultrasonic heating and cooling energy meter for HVAC and thermal-energy monitoring. It combines non-invasive ultrasonic flow measurement with paired temperature measurement to calculate heating or cooling energy from flow rate and supply/return temperature difference.
The flow transducer and temperature sensors are mounted externally on the pipe, allowing installation without cutting the pipe or introducing moving parts into the liquid path. The product is particularly suitable for central air-conditioning, chilled-water, and hot-water systems.
Key Features
- Clamp-on flow and temperature measurement without pipe cutting
- Measures flow, temperature difference, and accumulated heating/cooling energy
- Compact structure for small-pipe HVAC and equipment applications
- PT1000 high-precision temperature sensors
- OLED display with local setup and measurement display
- RS485 communication with Modbus or MeterBus options
- Optional OCT upper- and lower-limit alarm output
- No moving parts and no additional pressure loss
Typical Applications
- Central air-conditioning systems
- Chilled-water and hot-water energy monitoring
- Building HVAC sub-metering
- Heat-exchange equipment
- Industrial cooling and heating loops
- Small-pipe thermal-energy monitoring
Measurement Principle
Heating or cooling energy is calculated from the measured liquid flow rate and the temperature difference between the supply and return pipes. The ultrasonic flow transducer is installed externally on the pipe, while one temperature sensor is installed on each side of the thermal circuit.
Technical Specifications
| Parameter | Value |
|---|---|
| Measurement principle | Ultrasonic transit time with paired temperature measurement |
| Velocity range | 0.1 to 5.0 m/s |
| Flow accuracy | ±2.0% |
| Repeatability | 0.8% |
| Nominal pipe sizes | DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80 |
| Temperature sensor | PT1000 |
| Communication | RS485; Modbus or MeterBus optional |
| Power supply | 24 VDC |
| Display | 128 × 64 OLED |
| Data storage | Daily, monthly, and annual totalizer records |
| Ambient temperature | 0 to 50 °C |
| RTD measuring range | 2 to 105 °C |
| Standard medium temperature | 0 to 50 °C |
| Humidity | 0–95% RH, non-condensing |
| Protection rating | IP54 |
| Enclosure material | Aluminum alloy |
System Components
- Energy-meter transmitter
- Clamp-on ultrasonic flow transducer
- Paired temperature sensors
- Temperature-sensor mounting blocks
- Connecting cable
- Pipe mounting straps and hardware
Pipe Size Options
| Nominal Size | Typical Pipe OD |
|---|---|
| DN15 | 20 mm |
| DN20 | 25 mm |
| DN25 | 32 mm |
| DN32 | 40 mm |
| DN40 | 50 mm |
| DN50 | 63 mm |
| DN65 | 75 mm |
| DN80 | 90 mm |
Selection Information
- Nominal pipe size and actual pipe OD
- Pipe material and wall thickness
- Heating or cooling application
- Supply and return temperature range
- Expected flow range
- Required communication interface