TELEDYNE ISCO 2150 Area Velocity Module


Teledyne ISCO’s 2100 Series offers flexible, modular design and easy configuration for a wide range of networked open-channel flow monitoring applications, including Inflow and Infiltration studies, CMOM and AMP data collection, and river monitoring.
Compact, stackable, NEMA 4x, 6P (IP68) modules snap together to provide the capabilities needed for practically any site and monitoring requirement.


Standard Features

  • Rugged, submersible enclosure meets NEMA 4X, 6P (IP68) environmental specs.
  • Chemically resistant epoxy-encapsulated sensor withstands abuse, resists oil and grease fouling, and eliminates the need for frequent cleaning.
  • Replaceable high-capacity internal desiccant cartridge and hydrophobic filter protect sensor reference from water entry and internal moisture.
  • Pressure transducer vent system automatically compensates for atmospheric pressure changes to maintain accuracy.
  • The quick-connect sensor can be easily removed and interchanged in the field without requiring recalibration.
  • Up to four 2100 Series flow modules can be networked by stacking and/or extension cables.
  • Software features:
    • Secure data storage. All data are continuously stored in flash memory to protect against loss in case of power failure
    • Easy to upgrade. New operating software can be downloaded into non-volatile flash memory, without affecting stored program and data.
    • Records and stores input voltage and temperature data.
    • Variable rate data storage lets you change the data storage interval when programmed conditions occur. This feature assures maximum information about an exceptional event – such as an overflow – while conserving power and data capacity during normal conditions.
    • 38,400 bps communication provides speedy setup and data retrieval.


  • Portable and permanent-site AV flow monitoring for inflow and infiltration, capacity assessment, sewer overflow, and sewer studies.
  • Measures shallow flow is small pipes. Low-profile velocity sensor minimizes flow stream obstruction, and senses velocity in flows down to 1 inch (25 mm) in depth.
  • Stack modules you need to build a compact, integrated system.
  • Monitor multiple flow streams at the same time.
  • Obtain redundant measurements to guarantee integrity.
  • Remotely locate modules and connect them via cable.
  • Expand your monitoring system as your requirements evolve.


​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​2150 Flow Module

Size (HxWxD):

2.9 x 11.3 x 7.5 in (74 x 287 x 191 mm)


2.0 lb (0.9 kg)

Materials of construction:

High-impact polystyrene, stainless steel

Enclosure (self-certified):

NEMA 4X, 6P (IP68)

Temperature Range:

-40° to 140° F (-40° to 60° C) operating and storage

Power Required:

12 VDC nominal (7.0 to 16.6 VDC), 100 mA typical, 1 mA standby

Power Source:

Typically, a Teledyne Isco 2191 Battery Module, containing 2 alkaline or 2 rechargeable lead-acid batteries. (Other power options are available; ask for details.)

Typical Battery Life:

(using 15-minute data storage interval) Energizer® Model 529 alkaline – 15 months; Teledyne Isco rechargeable lead-acid – 2.5 months

Program Memory:

Non-volatile programmable flash; can be updated using PC without opening enclosure; retains user program after updating.

Built-in Conversions

Flow Rate Conversions:

Up to 2 independent level-to-area conversions and/or level-to-flow rate conversions.

Level-to-Area Conversions:

Channel Shapes – round, U-shaped, rectangular, trapezoidal, elliptical, with silt correction; Data Points – Up to 50 level-area points.

Level-to-Flow Conversions:

Most common weirs and flumes; Manning Formula; Data Points (up to 50 level-flow points); 2-term polynomial equation

Total Flow Calculations:

Up to 2 independent, net, positive or negative, based on either flow rate conversion

Data Handling and Communications

Data Storage:

Non-volatile flash; retains stored data during program updates. Capacity 395,000 bytes (up to 79,000 readings, equal to over 270 days of level and velocity readings at 15-minute intervals, plus total flow and input voltage readings at 24-hour intervals)

Data Types:

Level, velocity, flow rate 1, flow rate 2, total flow 1, total flow 2, input voltage, temperature

Storage Mode:

Rollover; 5 bytes per reading.

Storage Interval:

15 or 30 seconds; 1, 2, 5, 15, or 30 minutes; or 1, 2, 4, 12, or 24 hours; Storage rate variable based on level, velocity, flow rate, total flow, or input voltage

Data Retrieval:

Serial connection to PC or optional 2101 Field Wizard module; optional modules for spread spectrum radio; land-line or cellular modem; 1xRTT. Modbus and 4-20 mA analog available.


Teledyne Isco Flowlink for setup, data retrieval, editing, analysis, and reporting

Multi-module networking:

Up to four 2100 Series Flow Modules, stacked and/or remotely connected. Max distance between modules 3300 ft (1000 m).

Serial Communication Speed:

38,400 bps

2150 Area Velocity Sensor

Size (HxWxD):

0.75 x 1.3 x 6.0 in (19 x 33 x 152 mm)

Cable (Length x Diameter):

33 ft x 0.37 in (10 m x 9 mm) standard. Custom lengths available on request.

Weight (including cable):

2.2 lbs (1 kg)

Materials of construction:

Sensor – Epoxy, chlorinated polyvinyl chloride (CPVC), stainless steel; Cable – Polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC)

Operating Temperature:

32° to 140° F (0° to 60° C)

Level Measurement


Submerged pressure transducer mounted in the flow stream

Transducer Type:

Differential linear integrated circuit pressure transducer


Standard: 0.033 to 10 ft (0.010 to 3.05 m)
Optional: up to 30 ft (9.15 m)

Maximum Allowable Level:

34 ft (10.5 m)


±0.01 ft from 0.033 to 10 ft (±0.003 m from 0.01 to 3.05 m)

Long-Term Stability:

±0.023 ft/yr (±0.007 m/yr)

Compensated Range:

32° to 122°F (0° to 50°C)

Velocity Measurement


Doppler ultrasonic, frequency 500 kHz

Typical Minimum Depth:

0.08 ft (25 mm)


-5 to +20 ft/s (-1.5 to +6.1 m/s)


(in water with uniform velocity profile, speed of sound = 4,850 ft/s, for indicated velocity range); ±0.1 ft/s from -5 to 5 ft/s (±0.03 m/s from -1.5 to +1.5 m/s); ±2% of reading from 5 to 20 ft/s (1.5 to 6.1 m/s)

Temperature Measurement


±3.6° F (±2° C)

2191 Battery Module

Size (HxWxD):

6.0 x 9.6 x 7.6 in (152 x 244 x 193 mm)

Weight (without batteries):

3.2 lb (1.4 kg)

Materials of construction:

High-impact polystyrene, stainless steel

Enclosure (self certified):

NEMA 4X, 6P, (IP68)


Two 6-volt Energizer Model 529* alkaline (25 Ahrs capacity) or Teledyne Isco Rechargeable Lead-acid (5 Ahrs capacity) recommended. *Note – Energizer 529 ER does not give specified life.