Dwyer Instruments TUF-250-BN | Tenant ultrasonic BTU flowmeter | DN25 pipe size and 3.5 m3/h permanent flow rate with BACnet® communication
The Dwyer TUF-400-BN is a tenant ultrasonic BTU flowmeter designed for DN40 piping with a 10 m³/h permanent rated flow rate. It combines ultrasonic flow measurement, temperature sensing and energy calculation in one compact unit, with BACnet® MSTP communication for integration with building management and utility billing systems.
Part Number: TUF-400-BN
Genuine stock at General Tech Services LLC, UAE, with free UAE-wide shipping. Request a quote in under a minute — call +971 6 5436933.
Product Overview
The Dwyer Series TUF Ultrasonic Energy Meter is designed to accurately and reliably measure heating and cooling energy consumption in clean, compatible liquids using ultrasonic technology. The TUF-400-BN is the DN40 version, rated for a 10 m³/h permanent flow rate.
By combining flow measurement, temperature sensing and energy calculation in one compact device, the TUF-400-BN simplifies heat metering and tenant-level utility sub-metering. It is suitable for applications involving chillers, boilers and individual apartment or tenant piping.
The ultrasonic design has no moving parts, helping reduce mechanical wear and maintenance requirements compared with mechanical BTU meters. An 8-digit LCD provides local readings of temperature, flow rate and energy consumption directly at the meter.
The TUF-400-BN uses BACnet® MSTP communication for integration with building automation systems and utility billing platforms. For installations requiring Modbus communication, the TUF-400-MD uses the same DN40 flowmeter body and specifications with Modbus® RTU communication.
The meter features a plastic housing with brass and 316L stainless steel wetted parts and an IP65 enclosure rating. It supports horizontal or vertical mounting. On horizontal pipe runs, the meter should be mounted at least 45° from horizontal to help prevent debris accumulation.
The DN40 version uses a threaded G1-1/2B/G2B connection within the DN15-DN40 connection range. The unit operates on a 24 Vac/Vdc supply and supports an optional user-supplied 3.6V ER26500 lithium battery for backup.
Key Benefits
- Combines ultrasonic flow measurement, temperature sensing and energy calculation in one compact unit
- DN40 design with 10 m³/h permanent rated flow
- No moving parts, helping reduce maintenance requirements
- 8-digit LCD for local temperature, flow and energy readings
- BACnet® MSTP communication for BMS and billing-system integration
- BTU accuracy Class 2 according to EN1434/CJ128
- IP65-rated plastic housing with brass and 316L stainless steel wetted parts
- Optional lithium battery backup
- Suitable for tenant-level heating and cooling energy metering
- Free UAE-wide shipping on genuine stock
- Call +971 6 5436933 for pricing and availability
Who This Product Is Best For
- Landlords and property managers requiring tenant-level heating and cooling BTU billing
- Building owners monitoring chillers, boilers, radiators or fan coil units
- BMS integrators standardising on BACnet® MSTP
- Commercial and residential properties requiring utility sub-metering
- HVAC and building-services contractors installing ultrasonic energy meters
How to Specify & Commission It
- Confirm that the DN40 pipe size and 10 m³/h permanent rated flow are suitable for the application.
- Install the meter using the threaded G1-1/2B/G2B connection within the DN15-DN40 connection range.
- Mount the meter horizontally or vertically according to the installation requirements. On horizontal pipe runs, maintain 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 output to the BMS or billing system and configure the required communication parameters.
- Verify 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-400-BN designed for?
The TUF-400-BN is designed for DN40 piping and has a 10 m³/h permanent rated flow rate.
What communication protocol does the TUF-400-BN use?
This version uses BACnet® MSTP communication for integration with building management and utility billing systems.
What connection does the TUF-400-BN use?
The DN40 version uses a threaded G1-1/2B/G2B connection within the DN15-DN40 connection range.
What accuracy class does the Series TUF provide?
The TUF Series provides BTU accuracy Class 2 according to EN1434/CJ128. Flow accuracy is ±(2+(0.02 Qp/Q))%, temperature accuracy is ±0.1°C (±0.18°F), and flowmeter repeatability is 1%.
What is the maximum operating pressure?
The maximum operating pressure is 232 psi (16 bar).
What are the temperature ranges?
The ambient temperature range is 41 to 131°F (5 to 55°C), while the process temperature range is 36 to 203°F (2 to 95°C).
Does the meter require external power?
Yes. The meter operates on 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-400-BN and TUF-400-MD?
Both models use the same DN40 flowmeter body and specifications. The communication protocol differs: the TUF-400-BN uses BACnet® MSTP, while the TUF-400-MD uses Modbus® RTU.
Is genuine stock available with UAE shipping?
Yes. Genuine stock with free UAE-wide shipping is available. Call +971 6 5436933 for current pricing and availability.
Request a Quote Today
For pricing or to place an order for the Dwyer TUF-400-BN, contact General Tech Services LLC.
Call +971 6 5436933 | www.generaltechshop.ae
