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Velocity Flow Meter

Velocity Flow Meter

Product Code:FH950

Need more Info? (514) 354-2511 - 1-800-463-4363

Features and Benefits

The lightweight, battery-powered FH950 Velocity Flow Meter was designed to provide accurate velocity 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, or use the FH950 to quickly calibrate area velocity flow meters, or verify primary devices such as weirs and flumes.

User-Friendly Interface Minimizes Field Time and Reduces Manhours by 50%
The FH950's rugged, lightweight and user-friendly design allows for easy set-up, operation and data management. An easy-to-use, menu-driven user interface includes a graphics display that is readable even in bright sunlight. The ability to store and download velocity and entered depth information within the meter, minimizes field time up to 50%. Discharge calculations are automatically calculated by the meter.
Conveniently download collected data to a PC via the USB connection, eliminating the need for labor intensive manual data transfer.
Maintenance-Free Electromagnetic Sensor
The FH950's electromagnetic sensor has no moving parts and never requires maintenance, making it the lowest maintenance solution on the market. Turbulent, noisy and low velocities are easily metered.

When the sensor is placed in flowing water, its magnetic field creates a voltage that is sensed by electrodes embedded in the sensor. The voltage amplitude, proportional to the water velocity flowing around the sensor, is electronically processed by the smart sensor's microprocessor and is digitally transmitted through the cable to the portable meter display.
See the Difference the FH950 Makes!
  • Reduce manhours 50% — the step-by-step user interface simplifies programming, delivers real time data, and downloads direct to PC — allowing a single person to take the readings and eliminating post site visit manual data transfer from log book to PC
  • Automatically calculates total discharge based on USGS and ISO metho — reduces time to manually calculate and likelihood of errors
  • Real-time velocity graphed on color display— visualize velocity trends quickly
  • Lowest maintenance solution on the market— electromagnetic velocity sensor with no moving parts never requires mechanical maintenance
  • Lightweight, rugged portable meter — only 1.5 pounds
  • Water resistant electronics
  • Rechargeable portable meter
  • Data Storage for up to 10 profiles (metering sites) with 32 stations (vertical profiles) per profile (site)
  • Easy-to-use, menu-driven interface display remains readable even in bright sunlight
  • Ideal for use in waters with organic matter; the magnetic inductive measurement principle is not negatively affected by these conditions like acoustics or mechanical meters.


  • Streams-NSIP (USGS National Streamflow Information Program)
  • Rivers
  • Weir/Flume/Flow Meter Calibration
  • Sewers
  • Mining Channels
  • Irrigation Channels




±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)
0 to +20 ft/s (0 to +6.09 m/s)

ABS, glass-filled
Environmental Rating
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
Polycarbonate with a thermoplastic elastomer (TPE) overmold
Environmental Rating
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 Display
Color, LCD; 3.5" QVGA, transflective
(readable in direct sunlight)
Measurement Resolution
Measurement <10: 0.001, Measurement <100: 0.01,
Measurement > 100: 0.1
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
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, mm
Stream Flow Calculation
Mean-section, Mid-section
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



Engineering Specifications
  1. The flow meter shall be a portable, velocity meter with electromagnetic sensor.
  2. The sensor technology shall be electromagnetic, with no moving parts and cable able to be disconnected from meter.
  3. The range of velocity measurement shall be 0 to +20 ft/s (0 to 6.09 m/s)
  4. The flow meter shall include a USB port for data downloads to a personal computer.
  5. The flow meter shall measure noisy and turbulent velocities.
  6. The flow meter shall be capable of storing up to 10 monitoring sites and 32 vertical profiles, and performing basic open channel profiling in the field.
  7. The flow meter shall have a 5 segment bar graph battery life gauge.
  8. The flow meter shall have a system self-check function.
  9. The flow meter shall have a battery saver mode/auto shut-off.
  10. The flow meter shall be battery powered using rechargeable Lithium Ion batteries.
  11. The flow meter shall have an external AC recharging capability.
  12. The flow meter shall have a graphical display. The display shall be color LCD, 3.5" QVGA, transflective (readable in direct sunlight).
  13. The flow meter shall automatically calculate total discharge based on USGS and ISO methods.
  14. The flow meter shall be water resistant, rated to IP67.
  15. The weight of the flow meter shall be no greater than 1.5 lbs (0.68 kg) without the sensor and no greater than 2.6 lbs (1.18 kg.) with the sensor and 20 feet of cable.
  16. The portable flow meter shall have a 21-key alphanumeric key pad, including power, hot keys and arrow keys.
  17. Noise rejection levels shall be user selectable at 50Hz or 60Hz.
  18. Real-time velocity shall be graphed on the flow meter's display.
  19. The flow meter shall be the Hach FH950 Portable Velocity Flow Meter.
Velocity measurements - Velocity Flow Meter Velocity measurements - Velocity Flow Meter



FH950 Portable Flow Meter System
System includes portable flow meter, electromagnetic sensor with specified cable length, universal sensor mount, USB cable, wading rod mount, power supply/charger, neck strap, thumb screw kit, soft case, and disposable cloth for cleaning.
FH950 X 0 X X X
Hach FH950, English 1        
Cable Length
5 foot (1.5m)     0 0 5
20 foot (6.1m)     0 2 0
40 foot (12.2m)     0 4 0
100 foot (30.5m)     1 0 0



FH950 Portable Meter
FH950.1 FH950 Portable Flow Meter (includes battery, battery charger and meter), English
Sensor Only
EM950.0005 Electromagnetic sensor w/5 ft (1.5 m) cable
EM950.0020 Electromagnetic sensor w/20 ft (6.1 m) cable
EM950.0040 Electromagnetic sensor w/40 ft (12.2 m) cable
EM950.0100 Electromagnetic sensor w/100 ft (130.5 m) cable
9073400 Fabric Carrying Case
9073600 Lithium Ion Battery
9072600 Battery Charger
9070800 USB Cable, 3 ft (1 m)
75015 Universal Sensor Mount
9071700 Adjustable Meter Mount
9073500 Wipe Cloth, used for cleaning
9073200 Sensor Thumb Screw Kit
9072700 Lanyard
Contact factory for information on Standard and Top Setting Wading Rod Kits or Suspension Cable Kits.
NOTE: Additional cable cannot be added after order is entered.



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