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.
Manufactured by: Teledyne ISCO
Model: LaserFlow® Ex hazardous area velocity sensor
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|
|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|
|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)|
|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