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Transus Instruments is a manufacturer and supplier of ground breaking Ultrasonic Flowmeters and Ultrasonic Transducers. Transus Instruments’ UIM Series of Ultrasonic Gas Flowmeters use our patented Broadband Continuous Wave© signal processing and high efficiency titanium transducers to provide reliable and precise flow measurement even in the most extreme applications. The UIM 4F has four paths as standard. It has been tested to meet the international standards for custody transfer metering including AGA-9 and OIMLR137 (class 0.5). The UIM-3/3F has 3 paths as standard. It is designed for industrial applications such as flare gas, shale and coal seam gas, landfill and biogas as well as process gases. Please see our Products page for details.

The Transus Instruments team bring with them decades of experience and each has contributed to the development of a broad range of ultrasonic flowmeters and other instruments. Their shared knowledge of the industry is unmatched and it is enhanced by previous experience in senior management positions in other leading companies. The Transus Instruments’ engineering team can also assist your company with product development from transducers to complete flowmeters. Please see our Services page for details.

“smart solutions to complex measurement challenges

Introducing the UIM 4F DUO


The UIM-4F DUO consists of two fully independent measurements in a single flow body. The UIM 4F DUO is available in 4 + 3 version as well as a 4 + 4 version at a lower price than our competitors’ 4 + 1 and 4 + 2 units. In the 4 + 3 version the main measurement is done by the UIM-4F four path and the secondary measurement by the UIM-3 path. The four path measurement is certified to OIML R 137 (class 0.5). By using a three path secondary measurement, the UIM-4F DUO provides the diagnostics needed to detect potential issues. Our competitors typically use only a single path or dual path for their secondary measurement, which does not have the sensitivity to detect small profile changes.

The 4 +4 version provides two fully independent measurements with custody transfer accuracy certified to OIML R 137 (class 0.5). For more information visit our Products Page or download the information leaflet.


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  • [18 September 2018]
    In conjunction with our partners, Liaoning SC Technology Company, Ltd., we will be exhibiting our UIM Series of ultrasonic gas flowmeters at the Gasex Conference and Exhibition in Hangzhou, China (October 29-31, 2018). Please visit us at the SC Technology Company booth to see the UIM Series and other leading-edge gas measurement products.
  • [21 February 2018]
    Please visit Wexon Oy at the upcoming Advanced Engineering 2018 Exhibition in Helsinki, Finland to discuss your gas flowmetering requirements. The exhibition will be on 29th and 30th of May 2018 at Messukeskus Helsinki, Finland. Wexon Oy will present their products at booth number 3a19. For more information the website address is
  • [18 January 2018]
    UIM-4F available up to 30” pipe size. The pipe size range of the UIM-4F Custody Transfer Ultrasonic Flowmeter now covers pipe sizes from 3” to 30”. Download the latest data sheets with the specifications in metric or US units.
  • [10 January 2018]
    We are very pleased to announce that Wexon will represent Transus Instruments in Finland. Wexon is a supplier of a wide range of sophisticated industrial instrumentation including many flowmeter technologies. Visit their website at http://www.wexon.fi. For contact details see our contacts page.
  • [3 October 2017]
    UIM-4F 3” size now meets OIML class 0.5. The new 3” version of the 4 path UIM-4F Ultrasonic Gas Flowmeter was successfully tested at DNVGL Laboratories to OIML R137 Class 0.5. Tests were witnessed by NMI and formal certification is pending. The UIM-4F size range from 4” to 16” already have OIML R137 Class 0.5 certification.
  • [4 July 2017]
    UIM Series flowmeters now CRN and CSA approved! We are pleased to announce that the UIM Series flowmeters are now approved for the use in Class I, Division I hazardous environments in both Canada and the United States. In addition, the UIM Series flowmeters have also received the CRN (Canadian Registration Number) for the compliance to ASME B31.3 of the complete product range. The certification process included pressure testing the transducers to 10x design pressure. Customers in the US and Canada please contact our partner Procon Systems if you wish to know more about our products and solutions we can offer you http://www.proconsystems.com/contact_us
  • [1 May 2017]
    Transus Instruments introduced the UIM Series Flowmeters at the European Flow Measurement Workshop (4-7 APRIL 2017, Noordwijk,The Netherlands). View photo. Arjan Stehouwer, General Manager of Transus Instruments BV, also presented a paper “Type approval testing of a low power fully intrinsically safe ultrasonic flowmeter”. Download a copy
  • [11 March 2017]
    A-B-T bv to represent Transus Instruments in Belgium and the Netherlands. Follow this link for details
  • [12 February 2017]
    European Flow Measurement Workshop.
    Please visit our booth at the upcoming European Flow Measurement Workshop (4-7 APRIL 2017,  Noordwijk, The Netherlands) to see the new UIM-4F and UIM-3 ultrasonic gas flowmeters. We will also present a paper at the workshop. Details on the workshop will be available on the EFMW website: http://www.efmws.eu
  • [2 February 2017]
    Procon Systems Inc
    to represent Transus Instruments in North America. Follow this link for details
  • [24 January 2017]
    Transus Instruments Pty Ltd
    has moved. We have moved our Australian office to the historical “Westella” building in central Hobart. Our street address is now 181 Elizabeth Street, Hobart, TAS, Australia 7000. Our postal address (PO Box 87, South Hobart, TAS 7004) remains the same. Photo
  • [2 December 2016]
    UIM-4F Four Path Custody Transfer Flowmeter now AGA-9 compliant !