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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


Velocity measurement


Measurement method


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


0.01 at measured value


0.1 at measured value


Depth measurement (optional)


Absolute pressure sensor

with single point calibration

Measuring range:

0 ... 3.05 m


The larger of ±2% of measured value or ±0.015 m

Methods for velocity measurement



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


18 hours typ. (20°C)

Data memory capacity

Up to 10 measuring locations (of 32 vertical profiles each)


-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


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


0.68 kg

IP class of protection




Handheld unit:

IP67 (USB cap attached)

Related Categories
Water Quality Multiprobes