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Motherwell MTG 8900d

Motherwell MTG 8900d is a high-accuracy FMCW radar tank gauge for custody transfer and inventory measurement in bulk liquid storage. It combines precise non-contact level measurement with temperature, water-interface and density inputs for integrated tank gauging. Request a quote for Motherwell MTG 8900d from AxFlow.

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Product features

  • FMCW radar measurement → Provides continuous non-contact tank level measurement with no mechanical float system.
  • ±0.5 mm published level accuracy → Supports demanding inventory and custody-transfer measurement requirements.
  • OIML R85 certification → Supports use in legally controlled tank-gauging applications where applicable.
  • Dual FFT and peak tracking → Helps distinguish the true liquid echo from reflections inside the tank.
  • Integrated temperature interface → Allows temperature data to be combined with level information in the gauging system.
  • Water-level and density inputs → Supports a broader view of tank contents when the corresponding sensors are installed.
  • Fixed-roof and still-pipe antenna options → Enables adaptation to different storage-tank arrangements.
  • Gas-tight process connection up to 40 bar → Extends suitability to pressurised process conditions within the approved configuration.
  • Diamond and host-system compatibility → Simplifies integration into tank-farm monitoring and inventory systems.
  • Diagnostic interface → Supports commissioning, troubleshooting and planned maintenance with less unnecessary intervention.

Product description

Bulk storage terminals, refineries and tank farms need reliable level data for inventory control, transfer accounting and safe operation. Motherwell MTG 8900d is a digital FMCW radar gauge constructed for high-accuracy storage-tank measurement, including custody-transfer duties where repeatability, traceability and stable performance are critical. Its non-contact measuring principle also reduces the number of moving parts exposed to the stored product.

The gauge transmits a frequency-modulated continuous-wave radar signal and evaluates the difference between the transmitted and reflected frequencies to determine the distance to the liquid surface. Dual FFT processing and peak tracking help identify the correct echo in demanding tank geometries, while antenna options support fixed-roof and still-pipe installations. The platform can also accept temperature, water-level and density inputs and can be integrated with Motherwell Diamond tank-gauging systems or other host systems.

Current Motherwell data states level accuracy of ±0.5 mm, an integrated temperature-probe interface with ±0.1 °C accuracy and a gas-tight process connection rated to 40 bar. The 8900d is certified to OIML R85 for tank gauging and is intended for custody-transfer applications. Exact antenna, process connection, hazardous-area configuration and communications should be selected against the tank design, product properties and site standards.

For operators, the practical value is consistent measurement with limited mechanical wear, simplified diagnostics and a platform that can combine several tank variables within one gauging architecture. This can reduce manual intervention, support inventory reconciliation and improve maintenance planning across a tank farm. AxFlow can support specification of the correct Motherwell MTG 8900d configuration, integration requirements, service and spare-parts planning.


Motherwell MTG 8900d is used for high-accuracy liquid level measurement in bulk storage tanks. It is particularly relevant to inventory management and custody-transfer applications. AxFlow can help confirm the correct antenna, process connection and system interface for the tank.
Current Motherwell data specifies level accuracy of ±0.5 mm. Actual installed performance depends on the complete configuration, tank arrangement and commissioning. The required accuracy class and legal-metrology requirements should therefore be confirmed during selection.
The gauge can interface with temperature probes and accept water-level and density inputs. This allows several tank variables to be handled within the wider gauging architecture. The required sensors and host-system functions must be specified for each installation.
Motherwell states that the 8900d is intended for custody-transfer tank gauging and carries OIML R85 certification. Site-specific legal-metrology approval can still depend on the complete installation and local regulations. AxFlow can support the technical specification before procurement.
Selection should consider tank geometry, measuring arrangement, product properties, pressure, hazardous-area requirements and communications. Antenna and process-connection choices should match the actual installation. Contact AxFlow for product selection and availability.
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