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Calculates flow velocity without the need to cut into existing pipework

Time of Flight

Key features:

  • Ultrasonic transit time measurement
  • Intuitive menu with easy configuration
  • Flexible measurement


The Orakel Time of Flight Sensor is a non invasive liquid flow measurement tool that uses ultrasonic technology to calculate flow velocity without the need to cut into existing pipework.

How it works

Transit time ultrasonic flow meters send and receive ultrasonic waves between transducers, in both the upstream and downstream directions, in the pipe.

At ‘no flow’ conditions, it takes the same time to travel upstream and downstream between the transducers. Under flowing conditions, the upstream wave will travel slower and take more time than the (faster)  downstream wave. When the fluid moves faster, the difference between the upstream and downstream times increases. The transmitter processes upstream and downstream times to determine the flow rate.


Intuitive Menu
Driven by HMI, the intuative menu makes installation easy
Includes a full set of instrument and measurement diagnostics
Precision Positioning
An integrated signal oscilloscope optimises sensor positioning and diagnostics
Easy Configuration
Includes an internal database of pipe, fluid and lining materials:

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

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).
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.
Data analysis
An optional GSM data-logger can be added and date sent to an online portal for detailed analysis


Control unit: 230 x 309 x 90mm
Transducers: 60 x 30 x 35mm
Environmental Protection
Enclosures and glands: IP 68
Transducers: IP 66
Flow Range
0-25m/sec (bi-directional)
Velocity Resolution
+/-0.5% of measured value under ideal conditions
(gas/solids <10% of volume)
Modbus RS485 slave serial communications

Operating Temperature
Control unit: -10°C to +65°C
Transducers: -20°C to +150°C
Control unit: ABS flame retardant IP65N, Nema 4X
Transducers: 316 stainless steel
0.15% of measured value
Pipe Size
12Vdc PSU at 10W
3m cable is supplied as standard
Transducers operating at 1MHz


 Designed to measure liquids, the ORAKEL Time of Flight Sensor can measure almost any fluid that contains <10% solids or gas; including water, oils, petrochemicals, alcohol and more.

The ORAKEL Time of Flight Sensor is suitable for:
■ Liquid flows needing precision measuring
■ High and low temperature flows
■ Pipeline leak detection
■ Management of liquid transfer

Learn More

Download the latest information about the Orakel and Time of Flight Flow Meters.

Datasheets – EN
ORAKEL Time of Flight Datasheet
MMS D017 – ORAKEL control unit

Datenblätter – DE
MMS D030 – GmbH ORAKEL Time of Flight
MMS D029 – GmbH ORAKEL Control Unit

Watch our Predictive Data Monitoring Video here

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Whitewalls Industrial Estate,
Colne, Lancashire,