3Wire FBTU2X is a wall-mounted ultrasonic flow meter designed for long-term liquid flow measurement and optional BTU / heat energy monitoring. It uses transit-time ultrasonic measurement technology to measure flow accurately without moving parts.
For IoTWatt 4.0 projects, FBTU2X provides the flow and BTU data needed to analyse chilled water systems, cooling load, chiller COP, pump operation, heat exchanger performance, abnormal flow behaviour and verified energy savings.
Flow measurement is essential for understanding chilled water, cooling water, process water and utility system performance. Without flow data, it is difficult to verify cooling output, detect abnormal flow, evaluate pump operation, calculate BTU or understand whether the system is operating efficiently.
FBTU2X provides a practical and cost-effective monitoring solution for long-term liquid flow measurement. With suitable Pt100 temperature transducers, it can also calculate heating or cooling energy using flow rate and supply / return temperature difference.
FBTU2X is best positioned as an ultrasonic flow and optional BTU meter for chilled water systems, HVAC monitoring, plant utilities, process water, energy audits and IoTWatt 4.0 cooling system analytics.
IoTWatt 4.0 can combine flow, temperature and electrical power data to calculate cooling performance, chiller efficiency and system behaviour over time.
Provides accurate and stable liquid flow readings using transit-time ultrasonic flow measurement technology.
With suitable Pt100 temperature transducers, FBTU2X can calculate heat energy from flow and temperature difference.
The ultrasonic measurement method has no moving mechanical parts, reducing wear and maintenance requirements.
Clamp-on transducers allow flow measurement without cutting the pipe, water shutdown or pressure loss.
Suitable for permanent installations, larger pipes or applications where clamp-on installation is not ideal.
Supports integration with PLC, SCADA, BMS, EMS, IoT gateways and IoTWatt 4.0 platforms.
Supports reliable long-term flow measurement for monitoring, reporting and performance analysis.
Converter protection up to IP67 and transducer protection up to IP68 for demanding environments.
Supports pipe diameters from DN25 to DN6000, depending on selected transducer and application.
Suitable for chilled water, cooling water, process water, raw water, reclaimed water, plant effluent, potable water, chemical liquids and other compatible liquids.
When paired with Pt100 temperature sensors, FBTU2X can support chilled water BTU monitoring, hot water energy measurement and HVAC energy monitoring.
Designed for continuous flow and optional BTU monitoring in industrial, commercial, HVAC and utility applications.
| Installation Method | Description | Best Use |
|---|---|---|
| Clamp-On Type | External transducers are clamped onto the outside of the pipe. | Retrofit projects, operating systems, no pipe cutting, no water shutdown and no pressure loss. |
| Insertion Type | Insertion sensors are installed into the pipe wall. | Larger pipes, permanent installations and applications where clamp-on measurement is not ideal. |
| Pipe-Type Meter | A dedicated meter pipe section is installed in-line. | Permanent metering points where stable measurement and controlled installation conditions are required. |
Correct installation depends on pipe material, pipe condition, pipe diameter, straight pipe availability, liquid quality, air bubbles, scaling and the selected transducer type.
| Item | FBTU2X Specification |
|---|---|
| Product Type | Wall-mounted ultrasonic flow meter |
| Measurement Principle | Transit-time ultrasonic flow measurement |
| Flow / BTU Capability | Flow measurement; optional BTU / heat energy measurement |
| Accuracy | ±1% |
| Display | 2 x 20 character LCD with backlight |
| Signal Output | 4-20 mA output, OCT pulse output and relay output |
| Signal Input | 3-way 4-20 mA input |
| Temperature Input | Supports Pt100 temperature transducer for heat / energy measurement |
| Communication | RS485 serial interface, Modbus support |
| Pipe Diameter | 25-6000 mm |
| Flow Rate | 0 to ±7 m/s |
| Straight Pipe Requirement | Upstream 10D, downstream 5D, 30D from pump |
| Liquid Type | Water, hot water, chilled water, city water, sea water, waste water, sewage, chemicals, plant effluent, beverage, ultra-pure liquids and others |
| Medium Temperature | -30°C to +160°C |
| Converter Operating Temperature | -20°C to +60°C |
| Flow Transducer Operating Temperature | -30°C to +160°C |
| Power Supply | DC 8-36 V or AC 85-264 V optional |
| Power Consumption | 1.5 W |
| Converter Dimension | 132 x 150 x 85 mm |
| Converter Protection | IP67 |
| Transducer Protection | IP68 |
FBTU2X supports different transducer selections based on pipe size, liquid condition, temperature and installation method.
FBTU2X can measure many liquid types. Final application suitability should be checked based on pipe material, liquid condition, temperature, turbidity, air bubbles and installation method.
For chilled water and HVAC systems, flow and temperature difference are required to understand actual cooling output. When FBTU2X is used with temperature sensors, IoTWatt 4.0 can compare cooling output against electrical input to understand system performance.
| Monitoring Area | What FBTU2X Provides | IoTWatt 4.0 Value |
|---|---|---|
| Chilled Water Flow | Continuous flow data for primary, secondary or process cooling circuits. | Understand flow profile, abnormal flow and system operating behaviour. |
| BTU / Cooling Load | Flow plus supply / return temperature difference. | Calculate cooling output and compare with chiller power input. |
| Chiller COP | BTU output data combined with electrical kW input. | Support WattMind chiller efficiency analytics and performance tracking. |
| Pump Optimisation | Flow trend compared against pump energy and operating schedule. | Identify excessive flow, throttling, bypassing or inefficient pumping behaviour. |
| Energy Audit Evidence | Flow, BTU and load profile records. | Support digital energy audit reports, savings verification and operational recommendations. |
FBTU2X gives IoTWatt 4.0 the flow and optional BTU data needed to move from “chiller kWh only” to real cooling efficiency analysis.
Chilled water BTU measurement, cooling system performance monitoring and chiller plant performance analysis.
Cooling water, process water, plant utility, reclaimed water and plant effluent flow monitoring.
Supports BTU measurement, cooling load calculation, pump optimisation and abnormal flow detection.
Supports building cooling system analysis, heat exchanger energy tracking and cost centre allocation.
Connect through RS485 / Modbus to automation, monitoring and energy management systems.
Flow and BTU data can be connected to IoTWatt 4.0 for long-term monitoring, analytics and reporting.
FBTU2X can be connected through RS485 / Modbus to IoT gateways and energy management platforms. When integrated with IoTWatt 4.0, flow and BTU data can be combined with power meter data, temperature readings, equipment status and energy cost data.
| IoTWatt 4.0 Use | How FBTU2X Supports It |
|---|---|
| Chiller COP Monitoring | Combines BTU output and electrical input to support chiller efficiency visibility. |
| Cooling Efficiency Tracking | Analyses cooling performance, abnormal flow and system behaviour over time. |
| Pump and Flow Analytics | Supports flow profile analysis against pump operation, energy and control schedules. |
| Digital Energy Audit | Provides flow and BTU evidence for audit findings, savings opportunities and performance verification. |
| EECA / Energy Reporting | Supports cooling system and utility-level data collection for energy management reporting. |
| WattSave Savings Verification | Supports before / after verification for chiller tuning, pump optimisation and chilled water improvements. |
Use FBTU2X with IoTWatt 4.0 when chilled water, cooling water or process water systems must be monitored for flow, BTU, efficiency, abnormal behaviour and verified savings.
The following visuals support the FBTU2X wall-mounted ultrasonic flow meter, transducer connection and product configuration information above.
FBTU2X wall-mounted ultrasonic flow meter
FBTU2X product and connection view
Saturn Pyro supports 3Wire FBTU2X ultrasonic flow meters for chilled water BTU monitoring, cooling system analysis, process water metering, chiller COP analytics, IoTWatt 4.0 digital energy audit projects, EECA reporting data collection and verified savings initiatives in Malaysia.
Malaysia
