Water Flow

Ott C31

The Ott C31 Universal Current Meter is a proven mechanical instrument for precise flow velocity measurements in rivers, open channels, drainage systems, and pipelines. Designed for use with hand held wading rods, or suspended from bridges, boats, and cableway installations, the Ott C31 has delivered reliable hydrometric measurements worldwide for decades.

Its robust, nickel plated brass construction, precision propeller system, and magnetically actuated impulse generation ensure dependable operation even in sediment laden, chemically aggressive, or turbulent waters.

When combined with the Ott Z400 Signal Counter, the Ott C31 forms a complete, field ready solution for accurate and efficient spot discharge measurements.

Typical Applications

• River and stream gauging
• Open channel and drainage flow measurements
• Bridge and cableway discharge measurements
• Wading rod measurements
• Hydrometric surveys and monitoring campaigns

Key Features – Ott C31

• Mechanical current meter with magnetically generated impulses (no internal power supply required)
• Rugged stainless steel shaft and oil filled propeller hub for smooth, low friction operation
• Watertight and pressure tight impulse device for reliable use in harsh environments
• Compatible with wading rods, sounding weights, winches, and cableway systems
• Long term proven design with thousands of installations worldwide

Ott C31 Measurement Performance

• Measurement type: Spot measurement
• Measured parameter: Flow velocity
• Measurement range: 0.025 … 10 m/s
• Accuracy: ± 2%

Ott Z400 Signal Counter

The Ott Z400 Signal Counter is the ideal handheld accessory for use with the Ott C31. It records the impulses generated by the current meter propeller and converts them into precise flow velocity measurements.

Depending on configuration, the Z400 can display time, impulse count, or directly calculated flow velocity, making it suitable for both manual calculations and rapid field assessments.

Key Features – Ott Z400

• Handheld, battery powered signal counter for mechanical current meters
• Multiple measurement modes:
  • Impulse measurement
  • Time measurement
  • Integration measurement (ideal for suspended measurements)
• Optional direct display of flow velocity (Z400 version M)
• Acoustic signal (buzzer) for impulse and ground contact indication
• USB interface for configuration and current meter equation setup
• Robust IP65 housing for field use

Compatibility

• Fully compatible with Ott C31 Universal Current Meter
• Supports rod mounted and cable suspended measurements
• Works with ground contact systems for integration measurements

System Benefits: C31 + Z400

• Proven mechanical accuracy combined with modern electronic counting
• Flexible deployment from wading rods to cableways
• Reliable measurements in challenging hydraulic conditions
• Simple operation with clear visual and acoustic feedback
• Long service life and low maintenance requirements

Why Choose the Ott C31?

The Ott C31 Universal Current Meter, paired with the Ott Z400 Signal Counter, delivers a robust, accurate, and time tested solution for professional hydrometric flow velocity measurements. This combination remains a trusted standard for water authorities, consultants, and researchers worldwide.

This product is manufactured by Ott and proudly represented by Aqualab Scientific.