SIWAREX WP231 is now approved NTEP approved for custody transfer applications

May 18, 2020

Siemens is pleased to announce it has successfully completed the National Type Evaluation Program (NTEP) evaluation of the SIWAREX WP231 and received the certificate of conformance from the National Conference of Weights and Measures (NCWM). This certificate of conformance allows the SIWAREX WP231 to be used in “legal for trade” c applications.


The SIWAREX WP231 is a weighing module for non-automatic scales such as hoppers, platform, and crane scales.  It has extensive diagnostic capability and limit value control, is well suited for industries demanding a high degree of accuracy, like food and beverage production, pharmaceutical, and chemical industries.   The advanced filtering capability of the SIWAREX WP231 allows accurate measurement in harshest environments.


The flexibility of the SIWAREX WP231 allows it to be integrated directly into the control system or operate standalone transmitting the weight measurement through the analog output or one of the onboard communication ports.


Key features of the SIWAREX WP231 include:


  • Accuracy of 0.05%
  • Measurement resolution of 4 million parts
  • 10 ms measurement rate


The WT231 weighing terminal measures the amount of product on a in a bin or tank where the mass of the material is required.  It is well suited for a wide range of industries: From food, pharmaceutical and chemical through mining, cement and steel making.


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Siemens Digital Industries (DI) is an innovation leader in automation and digitalization. Closely collaborating with partners and customers, DI drives the digital transformation in the process and discrete industries. With its Digital Enterprise portfolio, DI provides companies of all sizes with an end-to-end set of products, solutions and services to integrate and digitalize the entire value chain. Optimized for the specific needs of each industry, DI’s unique portfolio supports customers to achieve greater productivity and flexibility. DI is constantly adding innovations to its portfolio to integrate cutting-edge future technologies. Siemens Digital Industries has its global headquarters in Nuremberg, Germany, and has around 75,000 employees internationally.



Siemens Corporation is a U.S. subsidiary of Siemens AG, a global powerhouse focusing on the areas of power generation and distribution, intelligent infrastructure for buildings and distributed energy systems, and automation and digitalization in the process and manufacturing industries. Through the separately managed company Siemens Mobility, a leading supplier of smart mobility solutions for rail and road transport, Siemens is shaping the world market for passenger and freight services. Due to its majority stakes in the publicly listed companies Siemens Healthineers AG and Siemens Gamesa Renewable Energy, Siemens is also a world-leading supplier of medical technology and digital healthcare services as well as environmentally friendly solutions for onshore and offshore wind power generation. For more than 160 years, the company has innovated and invented technologies to support American industry spanning manufacturing, energy, healthcare and infrastructure. In fiscal 2018, Siemens USA reported revenue of $23.7 billion, including $5.0 billion in exports, and employs approximately 50,000 people throughout all 50 states and Puerto Rico.