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Products > Automatic Water Samplers > 700 Series Modules >

 750 Area Velocity Flow Module

Area Velocity - no weir or flume needed! Handles submerged, surcharged, and reverse flow.

The sensor on the 750 module uses patented Doppler technology to directly measure average velocity in the flow stream. An integral pressure transducer measures liquid depth to determine flow area. The 6712 sampler then calculates flow rate by multiplying the area of the flow stream by its average velocity.

The 750 gives you greater accuracy in applications where weirs or flumes are not practical, or where submerged, full pipe, surcharged and reverse flow conditions may occur. With area velocity you don’t have to estimate the slope and roughness of the channel. And Isco’s exclusive 500 kHz Doppler penetrates farther into deep flow streams than 1 MHz systems, whose shorter wavelength can cause them to give “nearsighted” velocity measurement in typical wastewater applications. The Doppler system continuously profiles the flow stream, eliminating profiling and calibration required by electromagnetic systems.

Standard Features

  • Sealed Area-Velocity sensor resists fouling by oil and grease. Streamlined shape sheds debris.
  • Choice of standard (10 ft) and extended (30 ft) level measurement range.
  • During the program’s operation, flow, velocity, and level values are viewable on the sampler's LCD display.
  • Level and velocity data stored in the sampler are available for later retrieval, reporting, and graphing using Isco Flowlink® software.

Applications

  • Accurate open channel flow measurement without a weir or flume
  • Pretreatment Compliance
  • Stormwater Runoff Monitoring
  • Permit Enforcement
  • Sewer Flow Monitoring
  • Combined Sewer Overflow Studies
  • Inflow and Infiltration Studies
  • River and Stream Gauging

Options and Accessories

  • Choice of Standard and Low Profile Area Velocity Sensors.
    - Standard Sensor is recommended for larger pipes and turbid flows with high concentrations of suspended solids and entrained air.
    - Low Profile Sensor is recommended for shallows flows, typically down to 1" (25 mm).
  • Isco mounting rings make it easy to install the area velocity sensor in round pipes, manhole inverts, and other open channels.
  • Isco Street Level Installation Tool to install monitoring system from ground level, eliminating the costs and hazards of confined space entry.

Specifications
750 Area Velocity Module
Size (HxWxD): 4.9 x 5.7 x 2.0 in (12.4 x 14.5 x 5.1 cm)
Weight: 0.9 lbs (0.4 kg)
Material: Polystyrene
Enclosure: NEMA 4X, 6 IP67
Power: 9 to 14V DC (provided by 6700 Series Sampler)
Program Memory: Non-volatile, programmable flash; can be field updated through sampler
Operating Temperature: 32° to 120°F (0° to 49°C)
Storage Temperature: 0° to 140°F (-18° to 60°C)
Level-to-Area Conversions
Channel shapes: Round, U-shaped, rectangular, trapezoidal
Data points: Four sets of 50 level-area points
Level-to-Flow Rate Conversions
Weirs: V-notch, rectangular, Cipolletti
Flumes: Parshall, Palmer-Bowlus, Leopold-Lagco,Trapezoidal, H, HS, HL
Manning Formula: Round, U-channel, rectangular, trapezoidal
Data Points: Four sets of 50 level-flow rate points
Equation: Two-term polynomial
Area Velocity Sensor – Standard and Extended Range
Size (LxWxH): 6.6 x 1.6 x 1.2 inches (16.8 x 4.1 x 3.0 cm)
Weight, incl. cable: 2.1 lbs (0.96 kg) for standard range probe with 25 foot cable; 3.9 lbs (1.8 kg) for extended range probe with 50 ft cable.
Materials: Polybutadiene-based polyurethane, stainless steel; PVC and CPVC cable
Operating Temperature Range: 32° to 160°F (0° to 71°C)
Compensated Temperature Range: 32° to 100°F (0° to 38°C)
Velocity Measurement
Method: Doppler Ultrasonic, 500 kHz
Velocity range: -5 to +20 ft/s (-1.5 to 6.1 m/s)
Minimum depth: 0.25 ft (75mm), typical
Level Measurement
Method: Submerged pressure transducer
Standard range probe: Measurement range 0.05 to 10 ft (0.015 to 3.05 m); max level 20 ft (6.1 m)
Extended range probe: Measurement range 0.05 to 30 ft (0.015 to 9.1 m); max level 40 ft (12.2 m)
Level Accuracy - Standard Range Probe, for indicated level range. Includes non-linearity, repeatability, and hysteresis at 25°C (77°F)
0.033 to 5.0 ft (0.01 to 1.52m): ±0.008 ft/ft (±0.008 m/m)
>5.0 ft (>1.52 m): ±0.012 ft/ft (±0.012 m/m)
Level Accuracy - Extended Range Probe, for indicated level range. Includes non-linearity, repeatability, and hysteresis at 25°C (77°F)
0.05 to 15ft (0.015 to 4.57m): ±0.03 ft (±0.009 m)
0.05 to 21ft (0.015 to 6.4m): ±0.09 ft (±0.027 m)
0.05 to 30ft (0.015 to 9.14m): ±0.3 ft (±0.09 m)
Area Velocity Sensor – Low Profile
Size (LxWxH): 6 x 1.3 x 0.75 inches (15.2 x 3.3 x 1.9 cm)
Weight, incl. cable: 2.1 lbs (0.96 kg)
Materials: Epoxy, CPVC, stainless steel; PVC and CPVC cable
Operating Temperature Range: 32° to 122°F (0° to 50°C)
Cable length: 25 ft (8m) standard. Up to 75 ft (22.8 m) with optional extension. Up to 1000 ft (300 m) with optional Quick Disconnect Box.
Velocity Measurement
Method: Doppler Ultrasonic, 500 kHz
Velocity range: -5 to +20 ft/s (-1.5 to 6.1 m/s)
Minimum depth: 0.08 ft (25mm), typical
Level Measurement
Method: Submerged pressure transducer
Range: 0.033 to 10 ft (0.01 to 3.05 m); max allowable level 20 ft (6.1 m)
Level Accuracy: Depths from 0.033 to 5.0 ft (0.01 to 1.52m): ±0.008 ft/ft (±0.008 m/m); Depth >5.0 ft (>1.52 m): ±0.012 ft/ft (±0.012 m/m). Accuracy per foot of change from calibrated depth @ 77°F (25°C). Includes non-linearity and hysteresis.


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