Speedy Pulsar Contacting doppler flow velocity sensor

Speedy is a steamlined, easy to fit liquid velocity sensor for use in channels, pipes or sections where no Primary Measurement Device (PMD) exists.

Pulsar’s Speedy velocity sensor communicates digitally and is designed to connect to Pulsar’s FlowCERT open channel flow monitor via FlowCERT’s on-board RS485, it provides the velocity measurement for velocity x head calculations of flow rate where no primary measurement device exists. Speedy can be mounted up to 250m from the FlowCERT controller. Speedy is available as a “wedge” sensor with a stainless steel base plate or as a pipe mounted sensor.

Speedy operates with one of the following Pulsar controllers:

    • Velocity Interface
      2 relays
      1x 4-20mA output
    • FlowCERT
      5 relays
      2x 4-20mA outputs
      Requires a Pulsar transducer
    • Ultimate
      8 relays standard (expandable)
      2x 4-20mA outputs standard (expandable)
      Two channel system (expandable
      Requires a level transducer


  • Streamlined, easy to fit sensor
  • In channels, pipes where no PMD is fitted
  • Wedge base mount or pipe mount option
  • Reliable proven and easy set up

Technical Specification


Constructions: Wedge sensor: installation on channel bottom
Pipe sensor: installation using nozzle and cutting ring joint in pipes
Construction material/description: Wedge sensor: Polyurethane, stainless steel 1.4571, PVDF
PA pipe sensor: stainless steel 1.4571, polyurethane, FEP coated cable
Sensor body weight: Nominal 1.5kg (3.3lbs)
Cable length: Up to 50m (164ft)
Cable types: LiC11Y 2×1.5 + 1x2x0.34
Cable diameter: 8.4mm ± 0.25mm (0.33in ± 0.01in)


IP rating: IP68
Operating temperature: -20°C to +50°C (-4°F to +122°F)
Storage temperature: -30°C to +70°C (-22°F to +158°F)
Operating pressure: Max. 4bar (58psi)


Accuracy/Repeability: 1% of the measured range or ±0.03m/s (±0.1ft/s)
Resolution: 3mm/sec
Measurement range: -6m/s to +6m/s (-20ft/s to +20ft/s)
Measurement principle: Doppler (flow velocity). Flow velocity sensor with v measurement using Doppler principle and temperature measurement to compensate temperature effects on speed of sound.
Measurement frequency: 1MHz
Zero point drift: 0 – absolutely stable zero point
Sonic lobe: ±5 degrees
Temperature measurement: -20ºC to +60ºC ±0.5ºC (-4°F to +140°F ± 32.9°F)

Reference : http://www.pulsar-pm.com

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