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UFM Guard

Contactless PIG-detector


A pig detector is essential for cleaning and testing transport lines for crude oil, liquefied gases and water. The advantage of the UFM Guard is that the clamp-on sensor is mounted on the outside of the pipe. The ultrasonic sensor registers if it is only the medium flows behind the pipe wall, or a pig. This non-invasive method is fast, reliable and helps prevent environmental pollution.

UFM Guard is non-invasive

At U-F-M we are specialists in ultrasonic clamp-on technology. This means that you bolt the UFM Guard sensor onto the outside of the pipe. The installation takes only a few minutes. Thanks to the compact design, it is even possible to mount the pig detector in a very tight space.

The non-invasive nature of this pig detector allows easy mounting on most pipelines. It is not necessary to interrupt the flow process for installation or monitoring.

UFM Guard clamp-on pig detector ATEX sensor | U-F-M | Ultrasonic Flow Management

  • non-invasive, no process interruptions
  • maintenance free
  • cost effictive
  • no moving parts
  • resistant to vibrations
  • IP 68 stainless steel housing
  • very accurate at low and high temperatures
  • ATEX flammable atmosphere approved
  • suitable for temperatures from -40°C to +92°C
  • OPTIONAL: DIN-rail for composing a ​​complete pig-detection system
  • detect blockades
  • detect pump cavitation
  • detect leaking valves
  • detect damage to bearings

This pig-detector has approval for ATEX zones.

-40°C to +92°C (Eex ia I/IIC)

This clamp-on PIG detector works on the basis of the friction between the passing pig and the pipe wall. The friction produces ultrasonic sound waves, perceptible to the sensor. This frequency differs from other background noise or vibrations caused by industrial environments. A large increase in noise indicates that the pig passes through the detection system, allowing time and location to be accurately recorded.

UFM Guard pig detection with ATEX sensor | U-F-M | Ultrasonic Flow Management



Will you not be performing flow measurements often enough to purchase the necessary equipment yourself? Rent the UFM Guard with us per day or per week. Take the measurements yourself, or leave it up to our service engineers.

We are happy to assist you with technical advice and support.


#ultrasonicflowmeter | U-F-M for sales, rental and service of ultrasonic clamp-on flowmeters