XSENS - XACT Water Cut Meter in field



The clamp-on XACT Water Cut meter provides accurate, reliable and cost effective 0-100% water cut measurement with high accuracy of +/-1% absolute over the whole range. The measurement happens on the outside of the pipe, offering a true non-intrusive clamp-on water cut meter.

Clamp-on design

Our water cut meter is clamped to the outside of a pipe and measures the percentage of Water-In-Oil (WIO) with ultrasonic signals straight through the pipe wall. The clamp on design allows for easy installation (2-3hrs) and it can be installed close to bends and valves if needed.

Measurement principle

By measuring the Speed of Sound (SoS) of acoustic signals through the water and oil mixture, we can determine the water cut.

XSENS has over many years and together with the Christian Michelsen Research Institute and NORCE uniquely created a model to measure the water-in-oil with high accuracy over the full 0-100% water cut range. The distance travelled per unit of time in meter per second (m/s) is very different for water and oil. Therefore, it is possible to measure the water cut in oil in a liquid mixture.

The figure on the right is illustrating that there is not a linear correlation between water cut and Speed of Sound. After years of investigating, XSENS found the correct model (not illustrated).


Since the meter is not in contact with the liquids due to it’s clamp-on design, it is not affected by erosion, corrosion, waxing, scaling or leakages. This makes the meter very reliable and robust, with minimal maintenance required.

Measuring Net Flow Rates

It is also possible to measure flow rates of oil and water at the same time as measuring the water cut. This is possible with our other product which combines both measurements: the XACT Liquid Flow & Fraction meter.

This meter is used to measure water cut in harsh industrial environments. It has a lightweight design and is available from 1.5 inch to 36 inch as standard and bigger on request. It comes with an integrated flow computer to provide the required outputs through analogue 4-20ma or digital Modbus signals.

There is no limit on pressure, viscosity or sour service as it does not affect the measurement or the meter itself. There is also no need for static mixers or flow straighteners.

For remote installations we can offer WiFi, cellular and satellite signals while adding solar panels for power. The meter can be accessed remotely through internet connection to be monitored and updated if needed.

Local displays for local reading of measurements can be added on request.

The meter is Ex Zone 1 and 2 certified for hazardous areas and can also be supplied without such certification to reduce cost.

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  • Measure water cut (WLR, Water Liquid Ratio) ranging from 0-100% with high accuracy +/- 1% absolute
  • Integrated flow computer provides water cut output
  • Clamp on design makes it easy to install (2-3hrs)
  • No need for static mixers or flow straighteners
  • No pressure drop


Xsens Specification

Item Requirement Range
General 1 Line size 1.5″ to 36″ and higher
2 Line Schedule Any
3 Pipe Class Any
4 Pipe Material Carbon Steel, SS316,Duplex (others)
5 Hazardous Area Protection Atex, IECEx Zone 1 and 2
6 Ingress Protection IP 66 (higher on request)
Process Conditions 7 Fluid Water and Oil mixture
8 Phase Liquid
9 Corrosive / Erosive Can handle both due to clamp-on design
10 Case Min Max
11 Flowrate m/s 0 40
12 Density No limit No limit
13 Design pressure No limit No limit
14 Design Temperature -20 deg C 100 deg C (higher as option)
15 Viscosity Range from water to heavy bunker oil
Sensor 16 Sensor Type Ultrasonic non-intrusive (clamp-on type).
Up to six pars (redundancy)
17 Measurement Principle Ultrasonic Speed of Sound
18 Housing Sensor Material SS316 / Aluminium
19 Cable from sensor to transmitter Armored, flame retardant type (xx meters length)
20 WIO (Water In Oil) range 0-100% WIO
21 Accuracy WIO (Water In Oil)  +/- 1% abs. (note 1)
22 Removable Assembly Yes
23 Electrical Connection 4-20mA / Modbus (WiFi, Canbus, Profibus and other on request)
24 Upstream Straight Length 2-5D (target)
25 Downstream Straight Length 2-5D (target)
Transmitter 26 Housing Material SS316 / Aluminium
27 Electrical Connection To custom specifications
28 Power Supply 12-24 VDC (external power, or other).
Typical 9,5Watt. 11 Watt at start up
29 Output Signal Modbus serial connected to flow computer via RS-485 /4-20mA
(others on request)
30 Mounting Integrated in sensor
Options 31 Pressure Transmitter NA
32 Temperature Transmitter 2*PT 100  elements included (note 2)
33 Flow Computer Included
34 Local Display Optional
35 Mounting Kit Included
36 Weight From 25 kg to150 kg depending on size
37 Dimensions See GA drawings from Xsens
Note 1 Poor mixing / stratified flow of oil and water can reduce accuracy in horizontal flow
Note 2 For installation at unstable temperature conditions, we recommend using local temperature readings