Digital heat meter BBUEM-DP

ultrasonic4-20 mAModbus

Product Overview
BBUEM-DP is a fixed dual-path ultrasonic energy meter designed for large chilled-water, hot-water and thermal-energy systems. It combines dual-path ultrasonic flow measurement with matched supply/return temperature sensing to calculate heating or cooling energy from liquid flow and ΔT. Clamp-on sensors are standard for non-intrusive installation; wetted sensors are available as an option.

Key Features

• Dual-path ultrasonic transit-time flow measurement for improved stability
• Heating and cooling energy calculation from flow and supply/return ΔT
• Flow accuracy ±0.5% of measured value
• Heating/cooling energy accuracy ±1.0%
• Pipe-size coverage 25 to 5000 mm
• Matched temperature sensors with 0.02 °C matching error
• Outputs: 4–20 mA, pulse/OCT, relay
• Communication: RS485 with Modbus protocol
• Standard clamp-on sensors; wetted transducers optional

Typical Applications

• Central chilled-water plants and boilers
• Large-building HVAC energy monitoring
• District heating and cooling networks
• Industrial cooling-water and heat-exchange systems
• Plant utility and energy-management systems
• Thermal-energy metering on large-diameter pipelines

Measurement Principle
Two ultrasonic paths measure transit-time differences to determine flow velocity in the same pipeline. Thermal energy is computed from measured flow rate and the measured temperature difference between supply and return.

Technical Specifications

• Flow measurement principle: Dual-path ultrasonic transit time
• Velocity range: 0 to ±12 m/s
• Flow accuracy: ±0.5% of measured value
• Heating/cooling energy accuracy: ±1.0%
• Temperature matching error: 0.02 °C
• Pipe size: 25 to 5000 mm
• Temperature measurement range: 2 to 105 °C
• Analog output: 4–20 mA, max load 750 Ω
• Pulse output: 0–9999 Hz, OCT
• Relay output: SPST, max. 1 Hz
• Communication: RS485, Modbus protocol
• Power supply: 24–36 VDC
• Display: 3.5-inch TFT LCD, 480 × 320
• Transmitter operating temp.: -40 to 60 °C
• Standard flow-transducer temp.: -40 to 80 °C
• Humidity: Up to 95% RH, non-condensing
• Transmitter enclosure: Die-cast aluminum
• Standard flow-transducer cable length: 10 m
• Temperature-sensor cable length: 5 m

Sensor Options

• Flow: Standard — clamp-on ultrasonic transducers; Optional — wetted ultrasonic transducers
• Temperature: Standard — clamp-on temperature sensors; Optional — wetted temperature sensors

Selection Information

• Pipe outside diameter and wall thickness
• Pipe material and internal lining, if any
• Heating or cooling medium (water, glycol mixes, etc.)
• Supply and return temperature range
• Expected flow range and flow profile
• Clamp-on or wetted sensor requirement
• Required cable length and routing
• Required outputs and communication interfaces (4–20 mA, pulse, RS485/Modbus)