LaserFlow® Non-contact Velocity Sensor

Advanced laser Doppler technology for non-contacting area velocity flow measurement

LaserFlowThe LaserFlow velocity sensor remotely measures flow in open channels with non-contact Laser Doppler Velocity technology and non-contact Ultrasonic Level technology. The sensor uses advanced technology to measure velocity with a laser beam at single or multiple points below the surface of the wastewater stream.

The sensor uses an ultrasonic level sensor to measure the level and determines a sub-surface point to measure velocity. The sensor then focuses its laser beam at this point and measures the frequency shift of the returned light.

The LaserFlow is ideal for a broad range of wastewater monitoring applications. It is compatible with both the Teledyne ISCO Signature Flowmeter and the Teledyne ISCO 2160 LaserFlow Module, depending on the type of installation.

During submerged conditions, flow measurement continues without interruption with optional continuous wave Doppler Ultrasonic Area Velocity technology.
With its specially designed mounting bracket in place, the LaserFlow can be deployed and removed from street level. This avoids the risk and expense of confined space entry. A variety of communication options enable programming and data retrieval from a remote location. Information about data quality can be recorded and transmitted with the flow data.

Additionally, built-in diagnostic tools simplify installation, maintenance, and advanced communication options reduce site visits. 


Lessons on LaserFlow - Episode 3: Peak Detect

Lessons on LaserFlow - Episode 2: Compatible Technologies

Lessons on LaserFlow - Episode 1: Introduction to LaserFlow

​LaserFlow Non-contact Velocity Sensor Overview

​Introduction to LaserFlow Operation


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.


High Velocity Flow Monitoring in a Sanitary Sewer Using LaserFlow App NoteApplication Note
LaserFlow Velocity Sensor and Signature Flow Meter Redundant Flow Measurement App NoteApplication Note
Non-contact LaserFlow performanceApplication Note
Signature Flow Meter Expansion Box App NoteApplication Note
Flow Monitoring Product Guide BrochureBrochure
LaserFlow BrochureBrochure
Teledyne ISCO Water & Wastewater Product GuideBrochure
Alden Lab - LaserFlow Flow Accuracy CertificateCase Study
Influent Flow Monitoring at Wastewater Treatment PlantCase Study
Non contact Laser System Solves Flow Measurement Challenges at Rzeszow Wastewater Treatment PlantCase Study
Wastewater Treatment Plant Influent Flow MonitoringCase Study
LaserFlow DatasheetDatasheet
LaserFlow Ex DatasheetDatasheet
Teledyne Isco 2160 LaserFlow ModuleDatasheet
Point-Nine Factor for Near Surface Flow MeasurementsPoster
TIENet® LaserFlow EX® Velocity Sensor Safety and Certification SheetSafety and Certification Sheet
TIENet™ LaserFlow™ Velocity Sensor Safety and Certification SheetSafety and Certification Sheet
2160 LaserFlow Module User ManualUser Manual
LaserFlow Ex User ManualUser Manual
TIENet 360 LaserFlow AV Sensor User ManualUser Manual


​LaserFlow® Non-contact Velocity Sensor

​Dimensions (HxWxD):
​14.96 x 10.3 x 22.32 in (38.01 x 26.21 x 56.7 cm)
​Laser Class:
​Class 3R
​Temperature Range:
​Operating: -20 to 60° C (-4 to 140° F)
Storage: -40 to 60° C (-40 to 140° F)
​Flow Accuracy:

Accuracy @ 22° C

±0.006m (0.02 ft) at < 1 ft level change

​± 0.012m (0.04 ft) at > 1 ft level change

​Power Required:
​Input voltage: 8 to 26V DC
12V DC Nominal

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




System Versatility

From industrial applications to manhole installations, the LaserFlow offers versatile configuration options to give you the flexibility to measure flow in most open channel applications. The sensor is compatible with both the Signature flowmeter for permanent discharge compliance monitoring, and the 2160 module for everything from portable surveys to permanent installations. Both flowmeters have a variety of communication options for remote data access and programming, eliminating the need for frequent site visits.

Single or Multiple Point Measurement

Depending on your application needs, the LaserFlow device can be programmed to take velocity measurements at single or multiple points below the water's surface, producing an accurate mean velocity reading.

Remote Ultrasonic Option

In applications where the level measurement point of the built-in ultrasonic and the measurement point of the laser velocity are of different elevations, such as a freefalling outfall or drop manhole, the remote ultrasonic option can be used so that both measurement points reference the same elevation.

Due to unique site requirements, various mounting hardware is available for use with the LaserFlow sensor and 310 remote ultrasonic sensor.

Optional Submerged Functionality

During submerged conditions, when water reaches the LaserFlow, the optional bottom-mounted TIENet™ 350 Area Velocity sensor seamlessly takes over the flow rate measurement. The sensor provides ultrasonic Doppler velocity measurement and Differential Pressure level measurement. This option measures flow in the pipe/channel. By measuring velocity over a large area, the ultrasonic Doppler technology provides more accurate flow measurement during submerged conditions.

Optional Redundant Measurement

For redundant flow measurement at critical monitoring sites, a unique flexibility is added by the optional 350 sensor when mounted at the bottom of the pipe. This sensor provides redundant velocity, level, and flow data from the same site as the LaserFlow device.

Easy and Secure Retrieval/Replacement Without Manhole Entry

Following initial installation and adjustment, the sensor can be installed or removed as needed without manhole entry in most situations, using the optional sensor retrieval arm to grasp the handle.

The handle's simple yet effective locking mechanism holds the sensor securely in place, and is easy to engage and release from above ground.

Standard Features

  • Non-contact velocity and level measurement                  
  • Single or Multiple Point measurement below the liquid surface                  
  • Rugged, submersible enclosure with IP68 ingress protection                  
  • Zero deadband from measurement point in non-contact level and velocity measurements                  
  • Quality readings without manual profiling                  
  • Bidirectional velocity measurement


  • Permanent and portable flow measurement for CSO, SSO, I&I, SSEs, CMOM, and other sewer monitoring programs     
  • Shallow flow measurement in varying pipe sizes                  
  • Wastewater treatment plant influent, process, and effluent flow measurement
  • Industrial process and discharge flow measurement                  
  • Stormwater conveyance and outfall                  
  • Irrigation canals and channels

Options and Accessories

  • Flow measurement during submerged conditions via Ultrasonic Doppler technology                  
  • Redundant flow measurement with simultaneous Continuous Wave Doppler or Ultrasonic Level Sensing                  
  • Permanent and temporary mounting hardware                  
  • Sensor retrieval arm enables installation and removal without confined space entry                  
  • Remote ultrasonic level sensor options for drop manhole and outfall applications