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MF pro – Water Flow Meter



OTT MF pro – Water Flow Meter

Handheld electromagnetic water flow meter with automatic discharge calculation

The OTT MF Pro is a user-friendly, low maintenance electromagnetic current meter for cost-efficient in-stream discharge measurement.

The OTT MF pro saves time in the field by automatically calculating discharge and its electromagnetic sensor head is maintenance-free, ideal for use in low-flow environments, and unaffected by large amounts of organic matter.

  • Spot
  • Electro-magnetic
  • Flow velocity and water depth
  • Low maintenance magnetic – inductive probe with level measurement for reliable flow measurements. Works well in low flow and turbulent conditions, cross – sections with weed growth and pollution. Applicable in streams and conduits.
  • 0 … 6 m/s
  • ± 2% of measured value ± 0.015 m/s ( 0 … 3 m/s ) and ± 4% of measured value ± 0.015 m/s ( 3 … 5 m/s )


  • Discharge automatically calculated: the OTT MF pro computes discharge automatically based on USGS and ISO methods, saving time and eliminating potential for error caused by written transcription 
  • Real-time velocity: velocity is graphed in real-time on the meter’s color display, allowing trends to be visualized quickly
  • Maintenance-free: the electromagnetic sensor head has no moving parts and is virtually maintenance-free
  • Versatile applications: the sensor’s magnetic inductive measurement principle makes the OTT MF pro ideal for use in low-flow conditions and environments heavy in organic matter, unlike mechanical or acoustic meters
  • User-friendly handheld: a lightweight, water-resistant handheld features a full color display that is easily readable even in bright sunlight
    Depth sensor: optionally included in the unit


Velocity measurement  
Measurement method Magnetic-inductive
Measuring range: 0 … 6 m/s
Accuracy at 0 ? 3 m/s ±2 % of meas. value ±0.015 m/s
Accuracy at 0 ? 5 m/s ±4 % of meas. value ±0.015 m/s
Zero stability ±0.015 m/s
0.001 at measured value <10
0.01 at measured value <100
0.1 at measured value >100
Depth measurement (option)  
Absolute pressure sensor with single point calibration
Measuring range: 0 … 3.05 m
Accuracy: The larger of ±2% of measured value or ±0.015 m
Methods for velocity measurement  
Streams: 1, 2, 3, 5, and 6 point measurement (ISO / USGS standards)
Conduits (canalization): 0.9 x Vmax; 0.2/0.4/0.8; 2D
velocity integrating method
Conduit profiles: Circular, rectangular, trapezoidal, 2/3 egg, inverted 2/3 egg
Methods for discharge calculation  
EN ISO 748 Mid and Mean section method
Power supply Lithium-ion battery
Lifetime 18 hours typ. (20°C)
Data memory capacity Up to 10 measuring locations (of 32 vertical profiles each)
Temperature -20 … +60°C (operation/storage)
Handheld unit display  
Graphic colour display, transflective LCD 3.5′, QVGA
Handheld unit interface: USB Mini B type, 5-pin
Export format TSV (Tab Separated Value) file format
Operating modes Real-time velocity measurement, Discharge profile (stream/conduit)
Noise suppression 50 Hz, 60 Hz (adjustable)
Cable lengths 2 m, 6 m,12 m, and 30 m
Sensor housing: ABS, glass-fiber reinforced
Handheld unit: Polycarbonate, moulded,by shock-absorbing elastomer (TPE)
Dimensions and weight  
Sensor body:  
L x W x H: 11.9 cm x 4.3 cm x 6.3 cm
Weight: 0.5 kg ( with 6 m cable)
Handheld unit:  
L x W x H: 21.8 cm x 9.3 cm x 5.3 cm
Weight: 0.68 kg
IP class of protection  
Sensor: IP68
Handheld unit: IP67 (USB cap attached)

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