Dwyer Instruments TUF-1250-MD | Tenant ultrasonic BTU flowmeter | DN125 pipe size and 100 m3/h permanent flow rate with Modbus® communication
The Dwyer Instruments TUF-1250-MD is a tenant ultrasonic BTU flowmeter designed for DN125 piping and a 100 m³/h permanent rated flow rate. It combines ultrasonic flow measurement, temperature sensing, and energy calculation in one compact unit, with Modbus® RTU communication for integration with building management and utility billing systems.
The meter is designed for measuring heating and cooling energy consumption in clean, compatible liquids and is suitable for applications involving chillers, boilers, radiators, fan coil units, and tenant-level heat metering.
Part Number: TUF-1250-MD
Genuine Dwyer stock is available from General Tech Services LLC, UAE, with free UAE-wide shipping. Request a quote in under a minute — call +971 6 5436933.
Product Overview
The Series TUF Ultrasonic Energy Meter uses ultrasonic technology to provide accurate and stable measurement of heating and cooling energy consumption. The TUF-1250-MD is the DN125 model, rated for a 100 m³/h permanent flow rate, and combines a flowmeter, temperature sensors, and energy calculator in a single compact device.
This integrated design makes the TUF-1250-MD suitable for tenant-level heat metering, utility billing, and energy monitoring in buildings where individual apartments, tenants, chillers, boilers, or HVAC circuits require separate energy measurement.
The meter has no moving parts, helping reduce maintenance requirements compared with mechanical BTU meters. Its 8-digit LCD display provides local readings of temperature, flow rate, and energy consumption directly at the meter.
The TUF-1250-MD uses Modbus® RTU communication for data transfer to compatible building management systems, monitoring platforms, and utility billing systems.
The DN125 version uses a GB9119 flange, 5" DN125 PN16 connection. It has a plastic housing with brass and 316L stainless steel wetted parts and an IP65 enclosure rating.
The meter can be installed horizontally or vertically. On horizontal pipe runs, installation should be at least 45° from horizontal to help prevent debris accumulation.
The unit operates on a 24 Vac/Vdc power supply, with an optional user-supplied 3.6V ER26500 lithium battery for backup. Power consumption is approximately 1 W.
For installations requiring BACnet communication instead of Modbus, the TUF-1250-BN variant uses the same DN125 flowmeter body and provides BACnet MSTP communication.
Key Benefits
- Combines flow measurement, temperature sensing, and energy calculation in one compact unit
- Ultrasonic technology with no moving parts for reduced mechanical maintenance
- DN125 configuration with a 100 m³/h permanent rated flow rate
- 8-digit LCD for local temperature, flow, and energy readings
- Modbus® RTU communication for BMS and utility billing integration
- IP65-rated plastic housing
- Brass and 316L stainless steel wetted materials
- Optional 3.6V ER26500 lithium battery backup
- Suitable for horizontal or vertical installation
- CE and RoHS compliant
- Free UAE-wide shipping on genuine Dwyer stock
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 using Modbus for utility sub-metering
- HVAC and energy-management contractors
- Commercial and residential buildings requiring individual energy measurement
How to Specify & Commission It
- Confirm that the DN125 pipe size and 100 m³/h permanent rated flow rate are suitable for the intended piping system and load.
- Install the meter using the GB9119 flange, 5" DN125 PN16 connection and follow the manufacturer's installation requirements.
- For horizontal pipe runs, maintain the recommended installation 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 Modbus® RTU output to the compatible BMS or utility 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 Dwyer TUF-1250-MD designed for?
The TUF-1250-MD is designed for DN125 piping and has a 100 m³/h permanent rated flow rate.
What communication protocol does the TUF-1250-MD use?
This variant uses Modbus® RTU communication for integration with compatible BMS, monitoring, and utility billing systems.
What is the BTU accuracy class of the TUF-1250-MD?
The Series TUF 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 362 psi (25 bar).
What are the ambient and process 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 TUF-1250-MD 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-1250-MD and TUF-1250-BN?
Both models use the same DN125 flowmeter body and core specifications. The primary difference is the communication protocol: the TUF-1250-MD uses Modbus® RTU, while the TUF-1250-BN uses BACnet MSTP.
Is genuine Dwyer stock available with UAE shipping?
Yes. Genuine Dwyer 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 to place an order, contact General Tech Services LLC, UAE.
Call +971 6 5436933
www.generaltechshop.ae
