• Velocity Flow Meter

Velocity Flow Meter

  • Velocity: 0 to +20 ft/s (0 to +6.09 m/s)
  • Level: 0 to 10 ft (0 to 3.05 m)

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The perfect handheld solution for wastewater and environmental flow monitoring.

Knowledge gained through years of in-the-field flow measurement experience has come together in the Hach FH950 Handheld Flow Meter. Designed for use in both environmental and sewer/wastewater flow measurement scenarios—whether you’re profiling streams and rivers or providing redundant verification of wastewater flow data—even the smallest hassles have been addressed. And the result for you? Massive time savings. From the field to the office, the Hach FH950 increases your efficiency at every turn. 

Designed for Accuracy and Efficiency

The lightweight, battery-powered Hach FH950 was designed to provide accurate velocity and level measurements while simplifying the entire measurement process in rugged field environments. Multiple user-friendly features designed into the FH950 allow you to quickly and easily determine stream velocities for required discharge measurements, calibrate area velocity flow meters, or verify primary devices such as weirs and flumes.

Easy Programming and Data Transfer

The FH950’s rugged, lightweight and user-friendly design allows for easy set-up, operation and data management. With an easy-to-use, menu-driven user interface that is readable even in bright sunlight, the FH950 has the ability to store both velocity and level information right within the meter, minimizing field time by up to 50%. Once the data is collected, simply download to a PC via the USB connection, eliminating the need for labor intensive manual data transfer.

Maintenance-Free Electromagnetic Sensor

Available with either Velocity or Velocity and Level capabilities, the FH950’s electromagnetic sensor has no moving parts and never requires mechanical maintenance, making it one of the lowest maintenance solutions on the market.

Smart Sensor Capabilities

With an innovative and compact sensor shape with intelligently-designed flow characteristics, the FH950 delivers reliable measurements at low velocities, in very shallow water, and in turbulent flow conditions. It even takes accurate readings in sediment, weed or organic debris-choked water. Plus, with an optional pressure cell for automatic level measurement and sensor positioning, the Hach FH950 is known for having as much brain as it has brawn.


  • Wastewater
  • Collection Systems
  • Environmental
Method Electromagnetic
Accuracy ±2% of reading ±0.05 ft/s (±0.015 m/s) through the range 
0 to 10 ft/s (0 to 3.04 m/s); ±4% of reading from 10 to 16 ft/s.(3.04 to 4.87 m/s)
Zero Stability ±0.05 ft/s (± 0.015 m/s)
Range 0 to +20 ft/s (0 to +6.09 m/s)
Method Diaphragm type: Absolute pressure with single point calibration
Accuracy (static)The larger of ±2% of reading or ±0.504 in (0.015 m). Steady state temperature and static non-flowing water.
Range0 to 10 ft (0 to 3.05 m)
Resolution 0.01 value <100; 0.1 value <1000; 1.0 value ≥1000
Minimum Water Level1.25 in (3.18 cm)
Material ABS, glass-filled
Environmental Rating IP68
Dimensions of Sensor 4.7" L x 1.7" W x 2.5" H / (11.9 L x 4.3 W x 6.3 H cm)
Cable Material Polyurethane jacketed
Cable Lengths 5, 20, 40, and100 ft.(1.5, 6.1,12.2, and 30.5 m)
Portable Meter
Material Polycarbonate with a thermoplastic elastomer (TPE) overmold
Environmental Rating IP67
Dimensions of Portable Meter 8.6" L x 3.7" W x 2.1 H / (21.8 L x 9.3 W x 5.3 H cm)
Storage Temperature Range -4 to 140°F (-20 to 60°C)
Operating Temperature Range -4 to 131ºF (-20 to 55ºC)
Battery Charge Temperature Range 32 to 104°F (0 to 40°C)
Battery Type Lithium-Ion, rechargeable
Battery Life Gauge 5 segment bar graph
Battery Life 18 hours heavy typical day use†; 68°F (20°C) 
†Defined as 30 minutes of set up, 6 one-hour periods of continuous use with sensor active and display at maximum brightness, 30 minutes of sleep mode between use periods, data download and power off.
Battery Charger AC wall outlet charger
USB Connector Type Mini-B, 5-pin, rated to IP67 when capped
Graphics DisplayColor, LCD; 3.5" QVGA, transflective (readable in direct sunlight)
Measurement ResolutionMeasurement <10: 0.001, Measurement <100: 0.01, Measurement > 100: 0.1 
Keypad Alpha-numeric
Operating Modes Real-time, Profiling
Profiling Types Stream, Conduit
Conduit Shapes Circular, Rectangular, Trapezoidal, 2/3 Egg, Inverted 2/3 Egg
Stream Entries Fixed, Non-Fixed Stations
Firmware Sensor and portable meter firmware are field upgradeable via USB
Noise Rejection User selectable 50Hz, 60Hz
Units of Measure Velocity: ft/s, m/s, cm/s, mm/s
Flow: ft3/sec, million gal/day, gal/day, gal/min, m3/sec, m3/min, m3/hour, m3/day, liters/s, liters/min
Depth: in, ft, m, cm, mmµ
Stream Flow Calculation Mean-section, Mid-section
Diagnostics Self test, keypad, display, event log
Conduit Profile Methods 0.9 x Vmax, 0.2/0.4/0.8, Vel. &Lvl. Integrator, 2D
Stream Profile Methods 1, 2, 3, 5 and 6 point (Velocity method - USGS and ISO)
File Types Real-time, Profiling, Event Log
Data Storage Up to 10 metering sites with 32 vertical profiles per site.
Maximum Number of Real-Time Files Three each with 480 readings at 1 per second
Language Support English