Teledyne ISCO LaserFlow® Ex

LaserFlow® Ex

  • 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


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

Manufactured by: Teledyne ISCO
Model: LaserFlow® Ex

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



Yes, the ordering process is very easy. Orders can be made via purchase order or by credit/debit card. Once we have the paperwork we can delivery next day to any location in Europe. Provided with the equipment is a quick start guide, and if you need extra support, the technical support engineers can be contacted via phone call.
No, all of our flowmeters are competitively priced and rental is an ideal option for cutting costs to a fraction of a full priced new flowmeter.
No problem. The quick start guide is designed to make installing the flow meters a simple task. Everything you require for set up will be found in the peli-box supplied with the flowmeter.
Every flow meter is tested upon shipping and return as part of our ISO9001 procedure. Also, as part of this procedure, the flow meter is calibrated once a year. If a copy of the calibration certificate is needed let us know.
The flow meters typically provide an accuracy of ±1 to 2% of rate, so if you are measuring 100l/sec then the accuracy is between 98-102l/sec.
We are here to help. If the self-help and quick start guides do not help, then call one of our technical support engineers on +44 (0) 1527 882060. We have supplied and supported many clamp on rental installations throughout Europe.
First, contact us for a quote. If you are happy with the quote then send us a purchase order. Or alternatively call us with credit card details and fill out and send us a rental agreement form.
If the stock is permitting, and all paperwork is received by 12pm then flow meters can usually be available the next day.
The minimum hire period for flow meters is one week.
Once you have the meter you can rent it for as long as you need it. However, it would help if you can let us know that you wish to extend the rental period. Upon return the meter is off-hired and once checked and tested, an invoice will be issued to you. Also, if you extend your rental past a 4, 8 or 12 week rental threshold, then you are entitled to a discount.
You are only charged for the period of time for which you have the flowmeter. So, if a flowmeter is returned 3 days late you are only charged for 3 extra days, and each of these days is charged at one fifth of the weeks hire cost.
Normally, you will use your own courier but if you have any problems let us know and we can arrange a pick up the day after you notify us, but you will be charged for the carriage and this cost will be added to the invoice.
Without exception, all our flow meters are tested. If you need a 110v plug instead of the standard 230v plug let us know.
All of our standard transducers will do -40degC to +150degC, but this will depend on your application.
  • Liquid: below 50mm CFLP transducers are required, 50-1000mm CRS-402 transducers and 150-8000mm CRS-401 transducers. All the bits you need can be supplied, and delivered with the meter.
  • Gas: below 80mm CRS-402 is required, for 80-300mm the CRS-401/CRV-310 and for above 300mm the CRW-312 transducers are required.
  • High temperatures: For liquid we can measure +450degC for liquid and for gas/steam +250degC. But please consult RS Hydro.
Of course, we make a small surcharge for each set of transducers. Most applications only require one set, but on occasion some people may require two, for more diverse pipe sizes and applications.
An ultrasonic wall thickness gauge, that measures to within 0.05mm, is provided as standard with all flow meter rental packages.
The screendump facility on the integrated dataloggers on all our flow meters, allows you to photograph any screen and download it to your pc.
After the equipment has been shipped, it is the responsibility of the hirer. However, in our experience it is rare that any of our flow meters are damaged. Our flow meters are tough, as well as accurate, and reliable.
We have hired more ultrasonic clamp on flow meters than any other company in Europe. We are now one of the world's largest distributors of GE Panametrics flow meters. We always review your application before hire so no unwanted surprises are encountered. Every effort has been made to make your flow meter hire and enjoyable experience: quick start guides to help you set up with ease, online videos for further help, rugged packaging for extra durability anywhere, and real flow engineers available for online/telephone support.