HERZOG sample preparation machines and automatic labs are setting standards in the extractive industry worldwide. All large manufacturers of the metal, cement, mining and recycling sector are using HERZOG for a reliable, fast and precise quality control of their products.

Our expertise in engineering, machine construction, automation and sampling is the base for an optimal configuration, quick start-up and smooth long-term operation of our systems. HERZOG is your ideal partner in every stage of your project- including engineering, installation, validation and maintenance.

four steps


As early as in the budget and engineering phase HERZOG is providing support in assessment, concept development and detailed design of your project.

DetailsMachine Construction


Drawing up design requirements is the initial step to control the project design throughout the engineering process. Usually, basic elements like functions, maintainability, and availability are defined according to the clients’ needs. The client will benefit from the HERZOG expertise in sample preparation and automation. On-site visit of a HERZOG sales engineer can be helpful to take up the client’s request and clarify open issues.


Evaluation of sampling, sample preparation and automation procedures are integral part of the engineering phase. If necessary, our application experts process sample material according to your guidelines or test out alternative methods for sampling and sample preparation. Our design engineers assess all relevant procedures to determine key conditions for an optimal automation performance.


Based on the technical specification, feasibility study and budgetary framework HERZOG proposes a concept study aiming at achieving intended objectives, minimizing likelihood or errors and costs, and assessing potential risks. At this high-level design stage, engineering issues are defined and potential solutions are provided. Within a reiterative process between client and design department the best solution for the application will be identified. The decade-long experience of HERZOG will support you to significantly shorten and focus this phase.


Within the following detailed design phase HERZOG elaborates each aspect of the automation including, e.g., dimensions, operating parameters, maintenance provisions, electrical wiring, software interfaces etc. The detailed design provides you with deep insight into the automation performance and is the basis for the quotation.



HERZOG can rely on extensive expertise in the design, manufacture and assembly of sample preparation machines. Our machines are optimally designed to meet the requirements of quality assurance in the extractive industry and guarantee an above-average service life as well as excellent user and maintenance friendliness.



Quality is a central component of our corporate culture. Our organizational structure is strongly process-oriented and is subject to a continuous improvement process based on our quality, environmental and occupational safety management system. Through numerous measures such as process standardization, error feedback systems or supplier audits, we implement our claim to supply machines and plants with the highest possible quality.


For HERZOG, innovative ability means to provide the right structures and framework conditions in order to adapt quickly to changing market conditions. Anticipation of scenarios as well as a consistent and targeted implementation of new ideas is of critical importance. HERZOG relies on an interdisciplinary and cross-functional product development process with agile project management. Needless to say that in the age of digitalization the development of intelligent, networked and adaptive solutions is paramount to HERZOG.


The design of HERZOG machines and components guarantee high flexibility to meet the particular needs of our customers. Individual configurations and layouts can be easily realized in order to provide our customers with both maximum planning freedom and significant time and cost savings. The modular way of design allows adaptation and extension of any automation.



HERZOG has decades of experience in the field of automation technology. Our interdisciplinary team from the fields of mechanical engineering, electrical engineering, robotics and software design develops and implements automation solutions which are optimally tailored to the needs of our customers.



Process standardization and automation are the key enabler for reproducible and consistent analysis results. Due to the decade-long experience HERZOG has developed proven technologies to minimize material loss and to avoid cross-contamination during sample preparation. According to the material and preparation procedure, special measures are taken for preventing material waste and effective cleaning between each sample batch.


Modern production requires online monitoring of the manufacturing processes. HERZOG systems have been designed as high-speed solutions to guarantee an optimum process performance even at a high sample throughput. To achieve this goal, we use perfectly tuned components, optimized handling systems and intelligent control systems on PLC and Scada-level for full capacity utilization.


One of HERZOG main focuses is process reliability in each automation step to reduce errors, minimize downtime, and improve productivity. Therefore, HERZOG combines tried-and-tested technology, use of high-quality components and efficient process control with individual concepts for complete redundancy and backup.


Protection of operating personnel is a significant part of our automation process. Hazards and risks with any industrial application are thoroughly analyzed. HERZOG provides a broad portfolio to meet your unique process safety requirements.


Due to its long business relationships HERZOG cooperates with nearly all other manufactures in the different markets. That is why a large variety of instruments necessary for sample preparation including third-party machines, handling systems, analyzers (XRF, OES, CNS, radioactivity etc.), PLC, and sensory systems (balances, grain sizer, optical systems etc.) can easily be integrated.


Our digital solutions provide you with a comprehensive and quick overview of the performance of your automation system and machines. With the help of PrepMaster Analytics, you can easily obtain information about all the relevant key performance indicators of your plant including utilization, performance and maintenance status. Many machines are equipped with a sensor-based automatic system for tool condition monitoring (TCM) and predictive maintenance (PM).



Representative sampling is a critical success factor for achieving the highest quality analytical accuracy and precision needed in process control. Mastering primary sampling is especially important for the automated analytical laboratory.

HERZOG offers equipment, consultancy, seminars based on the principles of Theory of Sampling (TOS).



The Theory of Sampling (TOS) has been developed by the French scientist Pierre Gy (1924-2015). It is the only fully comprehensive approach covering all factors influencing representative sampling. TOS provides all necessary tools to achieve reliable material characterization and process control.

Only representative aliquots reduce the measurement uncertainty (MU) of the full sampling and analysis process to its desired minimum. Current MU approaches do not take sufficient account of all sources affecting the measurement process, in particular the impact of sampling errors. All pre-analysis sampling steps including laboratory mass reduction significantly influence the total MU.

Most sampling errors are not included in the current MU framework, including incorrect sampling errors (ISEs), which are only defined in the TOS. If ISEs are not appropriately reduced, or fully eliminated, all measurement uncertainty estimates are subject to uncontrollable and inestimable sampling bias which cannot be subjected to conventional bias-correction. TOS provides all the theoretical and practical countermeasures required for the task.

HERZOG and KHE Consulting offer consulting with a focus on representative sampling. In addition, we have developed a special course program to provide an introduction to the TOS principles and their application to industrial processes. Representative sampling is a critical success factor for the economic bottom line, helping to reduce or eliminate all unnecessary sampling, handling, preparation and measurement errors. Therefore, TOS principles are integral part of the project work for our clients.


HERZOG and KHE Consulting offer introductory seminars and comprehensive training courses on “Theory of Sampling”. The collaboration between both companies aims to raise awareness and teach practical competence in sampling and process monitoring also in the laboratory. The ultimate purpose is to reduce all unnecessary sampling and handling errors and maximize the process efficiency.

Seminar „Theory of Sampling“
Sampling stationary lots and streams of moving matter constitutes the beginning of a multi-stage process, which is frequently underestimated as an error sources in analytics. In fact, sampling errors dominate the total error budget by factors 10-25.
This seminar introduces all basic principles underlining representative sampling with a focus on primary sampling of stationary lots. The seminar addresses the six governing principles of sampling and the four working principles of sampling unit operations.
This seminar gives participants a working overview of how to guarantee that only representative sampling procedures and equipment are used. In case the existing procedures are found insufficient, TOS has the right tool box to implement the necessary improvements.

Seminar „Variographics“
This seminar presents the topic “Principles of variographics” for advanced operators and is based on the seminar “Theory of Sampling”.
Variographic analysis of process data is a versatile tool to analyze the variability of data and attribute it to sampling or analytical errors. In this way it is possible to determine the underlying reason for data fluctuations which is often hidden by the total error. The seminar teaches in a practical way how TOS can be employed to reduce and eliminate unnecessary errors which cannot be detected by ordinary statistical approaches.

After 35 years a.o. as research professor in Geoscience Data Analysis and Sampling at GEUS (National Geological Surveys of Denmark and Greenland), chemometrics professor with the ACABS research group, Aalborg University, Denmark, and professor (Process Analytical Technologies) at Telemark Institute of Technology, Norway, in 2015 he phased out this institutional career and established an international consultancy ( A geologist/geochemist/data analyst of training, since 2001 he has devoted his time to the theme of representative sampling of heterogeneous systems and processes (Theory of Sampling, TOS), PAT (Process Analytical Technology) and chemometrics (multivariate data analysis). In 2003 he organized the first World Conference on Sampling and Blending conference. Across all years he has put a strong emphasis on scientific outreach and academic teaching (he is the author of a chemometrics textbook, published in five editions (33,000 copies). He was chairman of the taskforce responsible for writing the world’s first horizontal (matrix-independent) sampling standard (2013). He is a member of five international scientific associations and societies.