Dwyer Instruments TUF-2000-BN | Tenant ultrasonic BTU flowmeter | DN200 pipe size and 200 m3/h permanent flow rate with BACnet® communication
The Dwyer TUF-1250-BN is a tenant ultrasonic BTU flowmeter designed for DN125 piping with a 100 m³/h permanent rated flow rate. It combines flow measurement, temperature sensing and energy calculation in one compact unit, with BACnet® MSTP communication for integration with building automation and utility billing systems.
Part Number: TUF-1250-BN
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Product Overview
The Dwyer Series TUF Ultrasonic Energy Meter uses ultrasonic technology to measure heating and cooling energy consumption in clean, compatible liquids. The TUF-1250-BN is the DN125 version, rated for a 100 m³/h permanent flow rate, making it suitable for larger chilled-water and heating-water systems.
By combining a flowmeter, temperature sensors and an energy calculator in one device, the TUF-1250-BN eliminates the need for separate measurement units in many installations. It is suitable for applications involving chillers, boilers, radiators, fan coil units and individual apartment or tenant piping, including heat metering and utility billing.
The ultrasonic measurement principle uses no moving parts, helping reduce mechanical wear and maintenance requirements compared with mechanical BTU meters. An integrated 8-digit LCD display provides local access to temperature, flow rate and energy consumption at the meter.
For building management and utility billing integration, the TUF-1250-BN uses BACnet® MSTP communication. This allows the meter to connect with compatible building automation and energy management systems.
The meter features a plastic housing with brass and 316L stainless steel wetted parts and an IP65 enclosure rating. The DN125 model uses a GB9119 flange, 5" DN125 PN16 connection. It can be installed horizontally or vertically, with horizontal pipe runs requiring positioning at least 45° from horizontal to help prevent debris accumulation.
The unit operates from a 24 Vac/Vdc power supply and supports an optional user-supplied 3.6V ER26500 lithium battery for backup. The corresponding TUF-1250-MD uses the same DN125 flowmeter body and specifications but provides Modbus RTU communication instead of BACnet® MSTP.
Key Benefits
- Combines flow measurement, temperature sensing and energy calculation in one compact meter
- DN125 pipe size with 100 m³/h permanent rated flow
- Ultrasonic technology with no moving parts for reduced mechanical maintenance
- 8-digit LCD for local temperature, flow and energy readings
- BACnet® MSTP communication for BMS and utility billing integration
- BTU accuracy Class 2 per EN1434/CJ128
- IP65-rated plastic housing
- Brass and 316L stainless steel wetted materials
- Optional 3.6V ER26500 lithium battery backup
- Suitable for tenant-level heat metering and utility sub-metering
- Free UAE-wide shipping on genuine stock
Who This Product Is Best For
The TUF-1250-BN is suited for:
- Landlords and property managers requiring tenant-level heating or cooling energy billing
- Building owners monitoring chillers, boilers, radiators and fan coil units
- BMS integrators using BACnet® for energy and utility sub-metering
- Commercial and residential buildings requiring centralized energy monitoring
- HVAC and mechanical contractors installing ultrasonic energy meters on DN125 piping
How to Specify & Commission It
- Confirm that the DN125 pipe size and 100 m³/h permanent rated flow are appropriate for the installation and expected load.
- Install the meter using the GB9119 flange, 5" DN125 PN16 connection and follow the specified horizontal or vertical mounting requirements.
- On horizontal pipe runs, maintain the recommended position of at least 45° from horizontal.
- Connect the 24 Vac/Vdc power supply and install the optional lithium battery backup if required.
- Connect the BACnet® MSTP communication output to the BMS or billing system and configure the required communication parameters.
- Verify the flow, temperature and energy readings on the local LCD before commissioning and handover.
Frequently Asked Questions
What pipe size and flow rate is the TUF-1250-BN designed for?
The TUF-1250-BN is designed for DN125 piping with a 100 m³/h permanent rated flow rate.
What communication protocol does the TUF-1250-BN use?
This variant uses BACnet® MSTP communication for integration with compatible BMS and utility billing systems.
What connection does the TUF-1250-BN use?
The DN125 model uses a GB9119 flange, 5" DN125 PN16 connection.
What accuracy does the TUF-1250-BN provide?
The Series TUF provides BTU accuracy Class 2 according to EN1434/CJ128, with flow accuracy of ±(2+(0.02 Qp/Q))% and temperature accuracy of ±0.1°C (±0.18°F).
What is the maximum operating pressure?
The maximum operating pressure is 362 psi (25 bar).
What is the process temperature range?
The process temperature range is 36 to 203°F (2 to 95°C).
Does the TUF-1250-BN require external power?
The meter operates from a 24 Vac/Vdc supply. An optional user-supplied 3.6V ER26500 lithium battery can provide backup for the display and stored readings during a power interruption.
What is the difference between the TUF-1250-BN and TUF-1250-MD?
Both variants use the same DN125 flowmeter body and specifications. The communication protocol differs: the TUF-1250-BN uses BACnet® MSTP, while the TUF-1250-MD uses Modbus RTU.
Is the TUF-1250-BN suitable for tenant energy billing?
Yes. Its combination of flow measurement, temperature measurement, energy calculation and BACnet® MSTP communication makes it suitable for tenant-level heat metering and utility sub-metering applications.
Is genuine stock available with UAE shipping?
Genuine stock with free UAE-wide shipping is available. Call +971 6 5436933 for current pricing and availability.
Request a Quote Today
For pricing, availability or technical assistance with the Dwyer TUF-1250-BN ultrasonic BTU flowmeter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
