​LaserFlow® Ex

Intrinsically Safe, Non-Contact, Subsurface Velocity Sensor

The LaserFlow Ex 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 can be installed in hazardous areas defined as Class 1, Div 1, Zone 0 and ATEX category 1G.

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 Ex is ideal for a broad range of wastewater monitoring applications. With Teledyne ISCO's TIENet Barrier, it is compatible with both the Teledyne ISCO Signature Flowmeter​ and the 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 Ex 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 its visits.

​For applications within the United Kingdom requiring certification by The Environment Agency, LaserFlow is designated MCERTS Class 2.




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


Standard Features:

  • Instrinsically Safe Class 1, Div 1, Zone 0 and ATEX category 1G

  • MCERTS Class 2

  • 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


Flow Measuring Product GuideBrochure
LaserFlow BrochureBrochure
Water and Wastewater Product GuideBrochure
LaserFlow Ex DatasheetDatasheet
Point-Nine Factor for Near Surface Flow MeasurementsPoster
TIENet LaserFlow EX Velocity Sensor Safety and Certification SheetSafety and Certification Sheet
LaserFlow_Ex_User_Manual_Rev-CUser Manual
TIENet Barrier Installation GuideUser Manual


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.


​LaserFlow Ex

​Dimensions (HxWxD):
​18.0 x 9.5 x 23.5 in (45.7 x 24.1 x 59.7 cm)
​Laser Class:
​Class 3R
​Temperature Range:
​Operating: -10 to 60° C (14 to 140° F)
Storage: -40 to 60° C (-40 to 140° F)
​Flow Accuracy:
​±4% of reading
​Power Required:
​Input voltage: 8 to 26V DC
11.5V DC Nominal

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