Water Flow


MF Pro

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.

Usage Type: Spot
Measurement technology: Electro-magnetic
Parameters measured: Flow velocity and water depth
Product Highlights: 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. Provides coloured graphics.
Measurement range: 0 … 6 m/s
Accuracy: ± 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

• Specifications

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 (optional)
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

Handheld unit display
Graphic colour display, transflective LCD 3.5′, QVGA
Handheld unit interface: 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)
  • MF pro

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