LaserFlow Ex hazardous Area Velocity Sensor with Signature Flow Meter

  • Safe for use in Hazardous areas Class 1, Div 1, Zone 0 and ATEX category 1G approved
  • Effortless data collection With remote communication options and flowlink software you can monitor data anytime and anywhere
  • Non-Contact The LaserFlow can accurately measure velocity of water without contacting and disturbing the flow of the water
  • Self-learning The LaserFlow adaptive focus option allows the laser flow to perform a scan and adapt the focus to the point with the best signal strength, ideal for elevation changes
Product Options


LaserFlow EX Hazardous Area Velocity Flow Meter

The LaserFlow Ex is the first Class 1, Div 1, Zone 0 and ATEX category 1G approved non-contact flowmeter that measures subsurface velocity. The sensor uses non-contact Laser Doppler Velocity technology and non-contact ultrasonic level technology to remotely measure flow in open channel, using a laser beam at single or multiple points below the surface of the water.

The sensor uses an ultrasonic level sensor to determine a point below the surface to measure velocity. It then focuses a laser beam on this point and calculates the shift in frequency of the returned light. This makes the sensor suitable for many different monitoring applications, with an accuracy of +/-4.0 % of the actual flow rate.

The optional continuous wave Doppler Ultrasonic Area velocity technology can continue flow measurement uninterrupted during submerged conditions.

The specialised mounting bracket allows for installation from street level, which eliminates the need for costly and risky confined space entry.

Also, visits to the Laserflow are kept minimal by the built-in diagnostic tools that make for simple installation and maintenance.

Options Available:

  • Built-in/ remote ultrasonic options
  • Surcharge sensor (available Q3 2019)
  • IP 66 enclosure for TIENet Barrier

Signature Flow Meter

The new Isco Signature flow meter is designed for open channel flow monitoring applications. It supports flow measurement technologies including ultrasonic and bubbler. Flow can be calculated using standard open channel level-to-flow conversions, level to flow data points as well as user-defined equations, depending on the needs of the application. Unique features provided by the Signature flow meter help to verify data integrity. It logs key events such as power outages and changes in calibration to validate data accuracy. Stored data can be easily reviewed to detect any type of data alteration.

Manufactured by: Teledyne ISCO
Model: LaserFlow Ex hazardous Area Velocity Sensor with Signature Flow Meter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


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


LaserFlow® Ex Sensor
Size (H x W x D): 18.0 x 9.5 x 23.5 in (45.7 x 24.1 x 59.7 cm)
Weight : 24.8 lbs (11.25 kg)
Materials: Conductive Carbon Filled ABS, SST, Conductive Kynar®a, Anodized Aluminum, UV Rated PVC
Cable Lengths: 32.8 or 75.5 ft (10 or 23 m)b
Enclosure: IP68
Certifications: Class I, Division 1, Groups C-D, T4 Exia Class I, Zone 0, AEx ia op is IIB T4 Ga II 1 G Ex ia op is IIB T4 Ga IECEx ia op is IIB T4 Ga
Laser Class: Class 3R
Temperature Range: Operating: 14 to 140 °F (-10 to 60 °C) Storage: -40 to 140 °F (-40 to 60 °C)
Power Required: Input voltage: 8 to 26 VDC 11.5 VDC Nominal
Flow Accuracy: ±4% of readingc
Communication Protocol: TIENet™
Technology: Non-Contact, Subsurface Laser Doppler Velocity (patented)
Measurement Range: 0 to 15 ft/s (0 to 4.6 m/s)
Maximum distance from liquid surface to bottom of sensor: 10 ft (3 m)
Minimum depth: 0.5 in (0.01 m)c
Accuracy: ±0.5% of reading 0.1 ft/s (±0.03 m/s)
Minimum Velocity: 0.5 ft/s (0.15 m/s)
Technology: Non-Contact Ultrasonic
Measurement Range: 0 to 10 ft (0 to 3 m) from measurement point
Accuracy@ 72 °F (22 °C)

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

0.04 ft (±0.012 m) at <1 ft level change

Temperature Coefficient within compensated range:

± 0.0002 x D (m) per degree C

± 0.00011 x D (ft) per degree F

(D = Distance from transducer to liquid surface)

Beam Angle: 10° (5° from center line)
Ultrasonic Signal: 50 KHz
Deadband: Zero deadband from bottom of LaserFlow sensord

a Kynar® is a registered trademark of Arkema, Inc.

b Custom cable lengths also available.

c Under normal flow conditions.

d Deadband for remote TIENet™ 310 ultrasonic level sensor varies, depending on the type of mounting hardware.

Options and Accessories

•Redundant flow measurement with simultaneous Continuous Wave Doppler or Ultrasonic Level Sensing

•Permanent mounting hardware

•Sensor retrieval arm enables installation and removal without confined space entry

•Remote ultrasonic level sensor options for drop manhole and outfall applications



You can find a full video introduction to the LaserFlow EX HERE