Marmonix MFU-6100 Modular Ultrasonic Flow Meter

The Marmonix MFU-6100 is a modular transit-time ultrasonic flow meter for non-invasive liquid flow measurement on closed pipes. Clamp-on / compatible transducers measure from outside the line on pipes about DN15–DN6000, with typical accuracy around ±1% of reading above 0.2 m/s for clean liquids such as water and process fluids.

Compare fixed and wall-mount options in the flow meters category. For permanent wall-mounted metering with AC/DC supply options, see also the MFU-6200 wall-mounted ultrasonic flow meter.

MFU-6100 ultrasonic flowmeter key features

What the MFU-6100 offers process and building teams:

• Transit-time ultrasonic measurement without cutting the pipe
• Pipe sizes about DN15–DN6000 with compatible transducers
• Typical accuracy ±1% of reading at rates >0.2 m/s · repeatability ~0.2%
• Backlit LCD for instantaneous/total flow, heat, velocity, and time
• Outputs: 4–20 mA, OCT pulse, and relay for control integration
• PT100 / analog inputs for heat measurement on compatible setups
• Low-power DC supply (about 24 V, <1.5 W) suited to OEM and BMS panels

Where teams use the MFU-6100 flow meter

Typical installations where the MFU-6100 fits include:

• Water & HVAC loops — non-invasive checks and continuous metering
• Process chemicals — clean liquids compatible with transit-time acoustics
• OEM / integrator panels — modular electronics for multi-pipe or compact cabinets
• Energy surveys — flow plus heat when PT100 sensors are connected

MFU-6100 typical specifications

MFU-6100 ultrasonic flow meter questions

Does the MFU-6100 require cutting into the pipe?

No — with clamp-on or other compatible transducers it measures from outside the pipe, so you can survey or meter without a process shutdown when the liquid and pipe are suitable.

When should I choose MFU-6100 instead of MFU-6200?

Choose the MFU-6100 for modular / OEM-style fixed metering on DC supply; choose the MFU-6200 when you want a wall-mounted transmitter with AC220V/DC24V options, Modbus RS-485, and optional SD logging for plant rooms.

What liquids work best with the MFU-6100?

Transit-time meters work best on relatively clean, ultrasonically conductive liquids (water, many oils and chemicals). Heavily aerated or slurry flows usually need a different technology.

Related: Flow meters · MFU-6200