Northlight Parade, Brierfield, Nelson, BB9 5EG / UK
+44 (0) 7858 476987



An  ultrasonic clamp on flow meter, the Orakel Time of Flight flow meter is a non invasive liquid flow measurement tool. It is used for monitoring flows in closed pipes and can be easily installed without stopping the process.  It uses ultrasonic technology to calculate flow velocity without the need to cut into existing pipework. Transducers are simply clamped onto the exterior wall of the pipe. This makes it ideal for measuring liquids in industrial process applications.

Ultrasonic clamp on flow meters work by sending an ultrasonic signal from one transducer to the next and measuring the time it takes for that signal to be received. This is known as Transit Time. Signals are sent through the pipe in both an upstream and downstream direction.

If there was no flow in the pipe, the transit time would be the same in either direction. However, when there is a flow, sound moves faster when travelling in the same direction as the flow and slower when moving against the flow. When the fluid moves faster, the difference between the upstream and downstream times increases. The difference in time between upstream measurement and the downstream measurement is used to calculate the flow.

Transit time ultrasonic flow meters can be configured in a Z, V and W pattern. The best configuration depends on factors such as pipe size, the condition of the pipe, or the characteristics of the liquid inside the pipe. The most common configuration is the V shape where two transducers are positioned on the same side of the pipe. When positioning the transducers, measure the pipe diameter and put the same distance between the transducers.


Intuitive Menu
Driven by HMI, the intuative menu makes installation easy
Precision Positioning
An integrated signal oscilloscope optimises sensor positioning and diagnostics
Flexible Measurement
Liquid can be measured in M, m3, USgal, mg, cf, bbl and Imp bbl. All measured values can be selected as flow rate per second, minute, hour or day and are automatically totalised.
Easy Configuration
Includes an internal database of pipe, fluid and lining materials:
Built in Parameters
Built-in fluid parameters allow calculations to compensate for speed of sound, density, viscosity, specific heat capacity and temperature (if temperature is known from optional temperature probe).
Includes a full set of instrument and measurement diagnostics
Data analysis
An optional GSM data-logger can be added and date sent to an online portal for detailed analysis

LINING:None, Cement, Epoxy, Glass, PP, PVDF, Rubber, Other
PIPE:Carbon Steel, Stainless Steel, Cast Iron, Ductile Iron, Copper, PVC, Aluminium, Asbestos, Fibre Glass – Epoxy, Other
FLUID:Water, Sea Water, Kerosene, Gasolene, Fuel Oil, Crude Oil, Freon R134a, Freon R22, Diesel Oil, Castor Oil, Peanut Oil, Ethylene glycol, Glycol/Water 50%, Alcohol, Other


 Designed to measure liquids, the ORAKEL ultrasonic clamp on flow meter can measure almost any fluid that contains <10% solids or gas; including water, oils, petrochemicals, alcohol and more.

It is suitable for the following applications:

  • Liquid flows needing precision measuring
  • High and low temperature flows
  • Pipeline leak detection
  • Management of liquid transfer
  • Process metering and flow measurement
  • Hot and cold water metering and flow measurement
  • Potable water measurement
  • Flow measurement of liquid ingredients

The ORAKEL Time of Flight flow meter is a cost effective alternative to traditional in-line meter installation.


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