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Universal Current Meter

With thousand of instruments deployed in a wide variety of applications over several decades, the OTT C31 has proven quality, precision and reliability.

Depending on the accessories used, the OTT C31 universal current meter covers a large variety of applications: As a rod-mounted or cable-suspended current meter, providing a measuring range from 0.025 to 10 m/s, it is suitable for measurements in small streams as well as in large rivers with cable way systems, or for use on survey vessels.

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Flow velocity from 0.025 m/s to 10 m/s (depending on propeller type)
Current meter contact 1 contact / revolution
Service life > 1 million switching cycles
Operating voltage range max. 9 V DC
Solenoid switch Pressure – tight up to 30 bar
    • Current meter body: Stainless steel, corrosion resistant
    • Current meter propellers: Standard aluminium, anodized
      Alternatively: Plastic – Hostaform C, yellow
    • D x L up to propeller tip: 35 x 310 mm
    • Weight without propeller: 1.26 kg


Measurement modes Pulse, time, integration mode, and integration measurement with remaining time determination
Measuring times 5 ,10 ,15, 20, 30, 40, 50, 60, 80, 100, 120 s, and infinitely
Resolution: Time / Pulse measurement 0.1 s / 0.1 pulses
Accuracy: Time / Pulse measurement ±0.01 s / ±0.5 pulses
Display of the flow velocity Optional
Display LCD, 4-digit numbers, 10 mm in height
Power supply 9 V block battery (IEC 6LR61)
Allowable ambient temperature -20°C to +60°C
Dimensions including rubber covers 128 mm x 125 mm x 65 mm (L x W x H)
Weight, complete 670 g
Class of protection IP65
Interface USB