Supply voltage: 10 – 24 Vdc or USB 5 Vdc with limited capability. Flow tube: one piece chemical inert Perfluoroalkoxy (PFA) ID 1/8″ and 1/4″.± 1.0% of reading at calibration temperature standard at 20 ☌ (68 ☏).Configuration and monitoring software includedĬhemical Inert Low Flow Ultrasonic Inline Liquid Flowmeter.Immune for changes of fluid velocity profile and Reynolds number.Bi-directional with indication of positive and negative flow.Process connections: 3/8″ John Guest, 1/2″ NPT or 1/2″ BSPP male.O-ring Viton, Nitrile, EPDM, Silicone or Kalrez.Flow tube materials PEEK® / 316L Stainless Steel or PEEK® / Glass.USB interface for configuration and monitoring.400 HzĪnalogue 0 – 5 / 10 V or 4 – 20 mA – scalable Outputs: Pulse NPN / PNP – to replace pulse flowmeters – max.Pressure rating: 10 bar (145 psi) / 30 bar (435 psi).Repeatability: ± 0.1% over 25 – 100% of the range.Ultra Low and Low Flow Ultrasonic Inline Liquid Flowmeter In practice, this gives the Atrato an excellent immunity to Reynolds number changes and a good high viscosity performance. It is therefore irrelevant whether the fluid velocity profile is fully formed with turbulent flow or completely laminar with a classic parabolic profile. In addition, the sound waves travelling down the tube in the Atrato operating system are symmetrical, and as a result, any changes in the fluid’s velocity profile across the pipe diameter will be averaged out by the signal as it passes from the transmitter to the receiver. As the flow increases, these signals go out of phase, and this phase shift is measured to an accuracy equivalent to 250 picoseconds. This gives a very stable zero flow condition and is the basis of the flowmeter’s high-ratio between minimum and maximum flows. As the system is fully balanced at zero flows, the two signals are identical and cancel each other out. The signal to noise ratio is remarkable, as there is little background noise and high signal strengths. The strong radial ultrasonic signal sends symmetrical pulses directly into the tube the sound travelling down the pipe can be considered as a plain wave. The Atrato system of low flow meters uses the well-proven time of flight measuring method, which is far more reliable and accurate than Doppler shift measurement, wherein, reflected signals are required from irregularities in the liquid. The USB interface on two of the three versions permits the user to directly monitor the rate and total on their laptop while also altering some of the operating parameters, such as the pulse resolution and units.
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