Freiburg,  Baden-Wuerttemberg 
  • Booth: 1530

Looking for speed measurement? We are your first choice!

RHEINTACHO Messtechnik GmbH - a German based company with longstanding tradition - has been engaged since 1901 in the field of rotational speed, a crucial control quantity for mechanical processes.

Just over 85 employees are employed at the company’s headquarters in Freiburg.

In-house product development, production and assembly departments guarantee quick and innovative solutions to customers’ individual requirements.

The production range incorporates a wide range of solutions of a high technical quality, principally in the field of rotational speed: sensors, hand-held measuring devices, rotary encoders and switching devices.

RHEINTACHO UK Ltd is specialized in the production of non-electronic measurement and indication instruments as well as tacho generators.

RHEINTACHO China acts as localized sales and support center for genuine RHEINTACHO product, and provides timely application and technical support for Chinese and Asian customer base.

RHEINTACHO Vision Systems S.A.S., with its Headquarters in Buhl (France), is specialized in the development, production and sales of camera-based inspection systems. 

Brands: Rotational Speed Sensors, Digital Hand-Tachometers rotaro, Mechanical Hand-Tachometers htm, Rotational Speed Monitor Systems rotas, Portable Stroboscopes, Stationary Stroboscopes

 Press Releases

  • The FP series of speed sensors are especially suitable for use in environments with extreme temperature loads, e.g. encapsulated motors or installation situations with limited heat exchange.

    Due to the intelligent and modern electronic design, mechanics and electronics are very well suited to withstand extreme temperature loads.

    This was verified with a long-term high temperature test in which the sensor was exposed to temperatures up to +160 °C.

    The completely newly developed series of sensors for the rotational speed and direction detection has the following additional technical data:

    • High-tech plastic sensor with 90° phase shift
    • Insertion depths: 35 mm and 45 mm
    • Protection class: IP65
    • Standstill detection (from 0 Hz)
    • High temperature resistance

    With the sensor electronics used here, the FP series offer reliable signal detection already from zero speed.

    The electronics are based on the 2-channel Differential-Hall principle and are suitable, for example, for applications in the fields of electric drives and forklift trucks.

    In developing this new series, the Freiburg-based sensor manufacturer is relying on the FK sensors that have already been successfully used in numerous applications for many years. Optimizations in terms of housing geometry, materials and electronics design offer potential customers a high degree of innovation and performance while maintaining the successful and reliable concept of the FK series.

  • What are you looking for when considering the use of speed detection inside your electric drive? High IP-rating? Zero-Hz-capability? Different connectors? High temperature resistance?

    We recommend, to have a close look on RHEINTACHO´s speed sensor series FQ, FP, FM and FK. The chances are high that you find exactly what you are searching for.

    Since more than a decade, the Freiburg–based specialists are supplying speed sensors for the demanding use in electric drive systems for various applications: Material handling, indoor-vehicles, electric fan drives and many others.

    General features

    All models of these sensor families are equipped with a proven differential-hall technology for safe and reliable detection of rotational speed even in critical electrical and magnetic environmental conditions. The 2-channel design allows not only detection of rotational speed but also the direction of rotation.

    Especially in the price-sensitive market of electric drives, users can choose RHEINTACHO sensors matching their needs regarding:
    - The required signals
    - The necessary protection class for their specific applications
    - Interface via cable
    - Connector integrated into the sensor body

    A wide variety of cable lengths and connector types round off the customization options.

    The sensors can be used in a wide range of temperatures (up to +140 °C) due to the housings made of high-quality plastic as well as other constructive measures. The housing material used has exceptional mechanical properties. For example, compression strength and material durability reach values that already allow for substitution of metal housings depending on the respective application. Among other features, the electrical structure provides a very wide range of possible supply voltages and a high level of EMC stability. The Hall element which are used cover a wide frequency range.

    The geometric design as flange sensor automatically ensures the proper installation position required for good signal determination.

    The most important features at a glance:
    - 2-channel differential-hall sensor
    - Housing made of high-performance plastic
    - Large detection distance possible
    - Wide frequency range
    - Wide temperature range

    Where this success story started: The FK series

    The FK series has proven over the last decade as a kind of world-standard for speed detection inside electric drives. And the many copies are to be seen as a grant of honors for an outstanding successful product. The 2-channel sensor design allows for both the speed and direction of rotation to be measured simultaneously using two phase-shifted signals. The temperature resistance and EMC resistance of this sensor achieves top values, thanks to its electronic design and the use of specially chosen materials.

    FM series – the all-integrated-sensor

    With the FM series, RHEINTACHO added a model, featuring connectors integrated directly into the sensor housing to its sensor portfolio. The sensor is made of a proven high-tech-plastic. The intelligent design, allows for the use of various connectors. And what is even more important to achieve the best possible installation: various connector outlet directions are possible. This is increasing your flexibility of design significantly.

    The connector output can be turned to 0°, 90° and 270°. This allows for the optimal adjustment according to the individual installation situation. The connector can be produced to be compatible with various common standards e.g.: AMP, Deutsch, and Yazaki.

    With the mating plug in use the entire unit is in accordance with the IP67 protection class. One of the standards the EMC values fulfil is the EN 13309:2010 construction machinery standard, amongst others. The mating plug can safely be assumed to be the limiting factor in light of the sensor's temperature resistance of up to 140°C.

    0-Hz-detection and highest temperature stability: FP series

    The FP comes with completely new designed sensor electronics. Resulting into major differences to the existing sensor series:
    - Standstill detection (from 0 Hz)
    - High temperature resistance

    These features are achieved thanks to smart electronic design, a careful choice of components and the use of state-of-the-art sensing elements. The other specifications are set to offer a high grade of exchangeability with the other discussed sensor series:
    - Insertion depth: 35 mm and 45 mm
    - Protection class: IP65

    FQ series – the one for the dirty jobs

    Thanks to a smart design of the sensor head with its cable outlet in either 90° or 180°, the FQ is achieving the high protection class of IP69K.

    Thanks to different sensor lengths, cable outlet directions and connector options, this product line offers users a high degree of flexibility, enabling adaptation to entirely individual requirements. And even if none of the available models is suitable, RHEINTACHO will be pleased to draw on its recognised expertise in customised solutions to develop the right solution for you.

    Why IP69K? RHEINTACHO Sales Manager Wolfgang Sexauer: "There is one main reason why we were motivated to develop this new series. We see a tendency to specify higher IP classes in many applications for safety reasons, than was the case a few years ago."

    The FQ product line is consequently a further development of the well-established FK product line, which fulfils protection class IP65.

    RHEINTACHO wholeheartedly welcomes higher specifications from users in regard to its sensors. "Our experience has shown that specifying too low an IP class and putting the onus on users via operating and maintenance instructions, is not practical. This simply doesn’t work", continues Wolfgang Sexauer. "When a machine is to be cleaned with a steam jet for practical reasons, it is difficult to convince the operators otherwise – regardless of what is found in the operating manuals. Subsequent problems "in the field" are then inevitable. Whether in consideration of all actual costs a more cost-effective, lower-specified  component is then the means of choice is at least questionable. And just for this reason we are expanding the proven FK product line to include the FQ series with its higher protection class. We always strive to offer the best technical and economic solution, tailored to the specific application."

  • RHEINTACHO FC und FE rotational speed sensors have proven themselves for years under difficult conditions in many applications. However, in connection with a customer project, a test like this has never been previously required or executed.

    Based on his experience of his devices in the field and the high disturbance potential when using (electronic) components under difficult conditions, our customer had extremely high requirements on the stability of his components, and in this case the rotational speed sensors, against temperature changes.

    The RHEINTACHO Project Team designed a combination for this application consisting of two rotational speed sensors from the modular system of RHEINTACHO: mechanically it is based on the FC sensor and electronically on the FE sensor version as a 2-channel hall-difference sensor. It is also suitable for detecting rotational speed and direction as well as being able to detect standstill (0 Hz). The connection interface uses a common type of Deutsch-plug. The protection class of the sensor is IP6K9K / IP67.

    Due to the intelligent and modern electronic layout, the mechanical and electronics are very capable of withstanding extreme temperature change stress. And as such, the development team at RHEINTACHO was very excited to see the test results for the test procedure as follows.

    The test procedure is very simple and extremely demanding:
    1000 change cycles between -40°C and 125°C. The change time between the temperature limits is maximum 30 seconds. The dwelling time at the temperature limits is 40 minutes each.

    The impressive result: all tested rotational speed sensors passed the “torture“ test being fully functional afterwards.

  • M8-rotational speed sensors and ABZ sensors from RHEINTACHO detect temperature additionally. With both above mentioned speed sensor series, RHEINTACHO is beginning to integrate temperature recording in addition to rotational speed measurement.

    Further sensor series are now being developed.

    And with the ABZ-sensor, RHEINTACHO is even going a step further: the recording of rotational direction and position are also included.

    For recording temperature, an NTC temperature element with the following specifications is used: ± 1.5 °C above the total operating range, NTC 4.7 kOhm, ±1 % @ R25; B25/85-value: 3830 K.

    Recording can of course be application/customer-specific in combination with other components.

    Depending on the application, the evaluation of the temperature signal has to be adapted to the differing installation conditions. In hydraulic applications, the homogenizing effect is supported by the hydraulic fluid. In electro-motors, the use of a temperature signal side in a speed sensor requires significantly more adaptation as the installation position has very different ambient conditions from the common installation position of the temperature sensor.

    The indisputable advantage of being able to call up several parameters at the same time is still actual. The cost advantages are complex and are not only limited to the installation costs, but also do not include requiring further sensor access gates.

    The advantages are obvious:

    • Material costs: one complete sensor with its own electronics, own housing and connection interface are saved.
    • Installation effort: complete elimination of one installation process.
    • Design simplification: Saving an additional sensor access including all possible side effects like improving design freedom and reducing leakage opportunity.

    Wolfgang Sexauer, Sales Manager: "At first glance, the idea is captivating and logical, as is every good idea. However, as usual, we can certainly say that the problem was in the detail. Especially when considering the realization of the series product, many challenges had to be overcome. But now the products are available, and sales is developing above our expectations. We are sure further series will follow."


  • Rotational speed sensors
    RHEINTACHO is specialized in developing and manufacturing rotational speed sensors for the harshest environments....

  • Rotational speed sensors use various magnetic proximity measuring principles to monitor the speeds of machine components in a range between 0 and 30,000 rpm. The application itself determines the measuring principle used. The sensors' resistance to high pressure, temperature changes, electromagnetic interference, aggressive media, water and steam jets is crucial for their operability and service life. RHEINTACHO offers a wide range of standard products for the most varied applications, with suitable measuring systems and electronics, appropriate housings, designs and connections. The German company also provides custom solutions, quickly and inexpensively.

  • Portable and stationary stroboscopes
    Stroboscopes are versatile instruments for the visualization of very fast movements. They are important and necessary tools for the inspection and control of machines and manufacturing lines e.g. in printing or textile industries....

  • Stroboscopes are versatile instruments for the visualization of very fast movements. They are important and necessary tools for the inspection and control of machines and manufacturing lines e.g in printing or textile industries.

    Stroboscopes could also be used for the non-contact measuring of rotational speed. If the stroboscope flash frequency matches the frequency of movement, the test object appears stationary. It can be observed and its frequency of movement recorded.

    The range of products available today allows bandwidths exceeding three metres to be illuminated.

    The extremely robust and precise hand-held stroboscopes are used to conduct measurements in difficult industrial environments and are specifically designed for maintenance work / commissioning and inspections.

    They are very easy to use: moving parts are optically “frozen” and thereby made visible to the human eye. In the apparent standstill thus generated, for example mechanical movements such as those on packaging and filling machines can be visualized, and defective components or sub-optimal settings can be can be identified or corrected during operation.

    In this field, RHEINTACHO hand-held stroboscopes in heavy-duty industrial design offer an ideal range of tried and tested potential solutions.

  • Digital hand-tachometers rotaro
    RHEINTACHO’s tried and tested digital handtachometer record rotational speeds and run lengths....

  • RHEINTACHO’s tried and tested digital handtachometer record rotational speeds and run lengths.
    The digital hand-tachometers are just as useful when setting up plants and machinery as during service jobs, monitoring manufacturing processes or in development laboratories. Example applications include measuring the rotational speeds of engines, pumps and turbines, as well as of mixers, centrifuges and conveyors; it can also measure the velocities and lengths of all kinds of sheets and belts.

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