2110 Ultrasonic Flow Module ​

For redundant level measurement with 2150, or standalone ultrasonic level/flow measurement

2110 Ultrasonic Flow ModuleThe 2110 Ultrasonic Module provides accurate non-contact liquid level measurement, using built-in software to calculate flow in weirs, flumes and streams. When used in conjunction with Teledyne ISCO’s Flowlink® data handling software, that information can be managed and used in a wide variety of ways. 

With the 2110, an ultrasonic sensor mounted above the flow stream transmits sound waves, which are reflected by the liquid surface. The elapsed time between transmitted and returned signals determin​es the liquid level. 

The device then calculates flow rate, using the liquid level reading and a built-in conversion for the specified primary device or natural stream boundaries. 

It can also be used for redundant level measurement to complement Teledyne ISCO’s 2150 Area Velocity Flow Module​.


When you purchase instruments from Teledyne ISCO, you not only receive innovative, high quality products, you also receive excellent customer service and product support. Your initial purchase is only the beginning of Teledyne ISCO's ongoing commitment to their customers.


2100 Series Flow Modules BrochureBrochure
Isco 2110 Ultrasonic Flow Module DatasheetDatasheet
2110 Ultrasonic Flow Module and Sensor Safety and Certification SheetSafety and Certification Sheet
2110 Ultrasonic Flow Module User ManualUser Manual


​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​2110 Ultrasonic Module

Size (HxWxD): 2.9 x 11.3 x 7.5 in. (7.4 x 28.7 x 19.1 cm)
Weight: 2.4 lbs. (1.08 kg)
Material: High-impact molded polystyrene, stainless steel
Enclosure (self-certified): NEMA 4X, 6P (IP68)
Power Required: 7 to 15V DC, typical operating current 60 mA at 12V DC, 0.3 mA standby
Typical Battery Life: *15 months (Level, temperature, and flow rate at 15-minute intervals; input voltage and total flow at 24 hour storage interval.) *Note: Using Energizer 529 alkaline batteries, discharged to a no load voltage of 4.2V DC per battery or 8.4V DC combined from the 2191 Battery Module.
Program Memory: Non-volatile, programmable flash; can be updated using PC without opening enclosure;retains user program after updating
Number of modules connected together: Up to 4, field interchangeable
Maximum distance between modules: 3,300 ft. (1,000 m)
Wiring between remote modules: Twisted pair for communication, pair for power, gauge dependent on distance

Level-to-Flow Rate Conversions

Weirs: V-notch, rectangular, Cipolletti, Teledyne Isco Flow Metering Inserts, Thel-Mar
Flumes: Parshall, Palmer-Bowlus, Leopold-Lagco, trapezoidal, H, HS, HL
Manning Formula: Round, U-shaped, rectangular, trapezoidal
Data Points: Up to 50 level-flow rate points
Equation: 2-term polynomial
Total Flow Calculations: 1 independent, net positive or net negative, based on flow rate conversion
Data Storage Memory: 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 readings at 15 minute intervals, plus total flow and input voltage readings at 24 hour intervals)
Data Types: Level, flow rate, total flow, temperature, input voltage
Storage Mode: Rollover with variable rate data storage based on level, flow rate, total flow, or input voltage
Storage Interval: 15 or 30 seconds; 1, 2, 5, 15, or 30 minutes; or 1, 2, 4, 12, or 24 hours
Bytes Per Reading: 5
Setup and Data Retrieval: Serial connection to IBM PC or compatible computer with Teledyne Isco Flowlink Software (Version 5.1 or newer recommended)
Baud Rate: 38,400
Operating temperature: 0° to 140°F (-18° to 60°C)
Storage temperature: -40° to 140°F (-40° to 60°C)

Ultrasonic Sensor

Enclosure: NEMA 4X 6P (IP68)
Length x diameter: 3.08 x 1.9 in (7.8 x 4.8 cm)
Cable: 32.8 ft x 0.3 in (10 m x 0.8 cm)
Weight (including cable): 2.0 lbs (0.9 kg)
Level Measurement (@ 20-25°C, 30-70% RH, stable, non-stratified air) ​
Frequency: 150 KHz, 95KHz
Cone Angle:
Range: *150 kHz - 4 to 72 in (0.1 to 1.8 m), 95 kHz - 12 to 144 in (0.3 to 3.6 m). *Note: Zero deadband possible for 150 kHz sensor only, when installed with horizontal mounting bracket. Minimum range specifications not guaranteed at maximum operating temperature.
Accuracy: The greater of ±0.013 ft. (3.96 mm) or ±0.0084 ft. (2.56 mm) per foot (0.305 m) from calibration point
Typical Temperature error: ± the sum of 0.0042 ft. + 0.00012 ft. per degree from 68°F

2191 Battery Module

Size (H x W x D): 6.0 x 9.6 x 7.6 in. (15.2 x 24.4 x 19.3 cm)
Weight (without batteries): 3.2 lbs. (1.4 kg)
Material: High-impact molded polystyrene
Enclosure (self-certified): NEMA 4X, 6P (IP68)
Batteries: 6V alkaline lantern or lead-acid lantern, quantity 2
Capacity: 25 Ahrs

​For a full list of product specifications, see the datasheet.



Standard Features

  • Digital communication between sensor and flow module makes it immune to RF interference.
  • Sensor deflector plate resists condensation.
  • Minimal deadband in level measurement.
  • Chemically resistant (PVDF) sensor package.
  • Modular, stackable design snaps together with other 2100 modules to quickly create application-optimized configurations.
  • Software features:
    • Variable data storage rates can automatically be switched when conditions vary
    • Communicates at 38.4k baud for speedy setup and data retrieval.
    • Easily upgradeable. New operating software can be downloaded into non-volatile "flash" memory, without affecting your stored program or data.
    • Rollover memory with variable rate data storage lets you change the data storage interval when programmed conditions occur.
    • Secure data storage. All data are continuously stored in “flash” memory to protect against loss in case of power failure. 
    • Records and stores input voltage information to let you know when to change batteries.


  • CSO, SSO, I&I, cMOM, SSEs, Sewer flow monitoring.
  • Open-channel flow measurement with or without primary devices.
  • Redundant level measurement in combination with Teledyne ISCO 2150 Area Velocity Flow Modules, or other AV systems.
  • Non-contact flow measurement in streams containing harsh chemicals, grease, or suspended solids.

Options and Accessories

  • Direct connect, modem, or wireless communication options let you choose the best data retrieval method for any job.
  • Bracket, suspension, or insertion mounting of ultrasonic sensor makes setup quick and flexible.
  • AC power adapter for fixed sites.