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Pressure switches: Differences in meaning and functions

Pressure switches are indispensable for a whole range of industrial and process engineering processes. In theory, their task sounds quite simple. When the pressure at the process connections of the switches reaches a preset value, the pressure switch opens or closes a switching contact.

In practice, however, the development and production of these components require the highest precision, because a lot depends on them. They automate processes and replace the decision and action of a human being at their places of use.


Pressure switches by ARGO-HYTOS

ARGO-HYTOS offers both classic pressure switches and electronic pressure sensors. There is still no way around classic switches in process control. Our pressure switches TS51 with one and TS52 with two adjustable pressure switching points impressively demonstrate the reasons for this.

They can be set up easily, precisely and quickly using one or two setting rings with an easy-to-read scale. The adjustment rings then engage reliably and prevent accidental adjustment of the pressure switch values.

The pressure switches also impress with their robustness and long service life. Their measuring cells, enclosed in stainless steel, have a service life of more than 50 million pressure cycles. The two pressure switches are also suitable for use in harsh environments thanks to protection class III and protection class IP67. They are shock and vibration resistant and available for different pressure ranges.


For which pressure ranges are the pressure switches TS51 and TS52 designed?

The TS51 pressure switch is available in the pressure ranges 0 - 250 bar and 0 - 400 bar, and the TS52 pressure switch is also available in the pressure range 0 - 100 bar. You can easily recognize the different models by the model designation with number, for example TS52-250 or TS51-400. The switching points start in each case at 1/20 of the measuring range - thus at 5, 12.5 and 20 bar. All achieve switching point accuracy with deviations of less than +/-2.5 percent of full scale. One (TS51, normally open) or two (TS52, normally closed/ normally open) digital PNP switching outputs are available for signal output.


ARGO-HYTOS temperature switches

In various other processes, no pressure switching reactions are required, but a precise reaction when reaching certain temperatures in a medium. For this area of application, ARGO-HYTOS has developed the TM1 temperature switch with the common installation length of 250 millimeters. It is intended for use in liquid media. Like the pressure switches, it has a robust, durable stainless steel housing around its measuring cell.

The switch features a very good response time and a short ready delay time. Its measuring range extends from minus 25 to plus 140 degrees Celsius. Between minus 20 and plus 140 degrees Celsius, you can freely define two temperature switching points. You set these using the intuitive switching point adjustment already established with our pressure switches.

Here, too, a mechanical lock on the setting rings ensures that the switching points cannot be changed unintentionally or by vibration. Other important data of the TM1 temperature switch are:

    • two PNP switching outputs (normally closed / normally open)
    • temperature influence per 10 K: 0.1 K
    • repeatability: +/- 0.1K
    • setting accuracy: +/- 3K



    Pressure sensors by ARGO-HYTOS

    Our pressure sensors demonstrate the logical technical evolution of the mechanical pressure switches that have proven themselves over many years. These sensors reliably meet the new requirements of today's process engineering. In addition to pure process control, the continuous recording and collection of data is also required here in order to configure processes and procedures even more precisely.

    Analog pressure signals can also be connected and operated with electronic control units. For this purpose, external control units receive analog signals from several measuring points and generate digital switching signals from them. However, this combination means increased technical effort with high costs. Sophisticated electronic pressure sensors such as the TSE3-D offer considerably more possibilities while at the same time providing convincing cost-effectiveness.

    Pressure sensors also give you more flexibility, precision and reliability than mechanical switches. Locally programmable and independent of a control unit, the sensors allow more control over all switching operations - even at minimal pressure.

    When switching frequently or under vibration, the TSE3-D shows a clear advantage over mechanical switches with robust precision. It reliably maintains its pressure switching points even under extreme loads - without mechanical wear or material fatigue. Thanks to the high-contrast display, you can always easily and quickly read off all settings and current process data locally.

    What are the technical features of the TSE3-D electronic pressure switch?

    • metallic thin film cell as measuring cell
    • developed for industrial use with fluid media
    • media temperature range: -25° C to 80° C
    • measuring range: 0 to 400 bar
    • switching point: 1.5 to 400 bar
    • analog start point: 0 to 320 bar
    • analog end point: 80 to 400 bar
    • adjustable in steps of 0.5 bar
    • switching point accuracy: < +/- 0.4 percent of span
    • repeatability: < +/- 0.1 percent of span
    • response time: less than 1.5 milliseconds
    • two switching signals
    • 1x for display of set pressure value or analog signal
    • 1x pressure value or communication via IO-Link (COM2)


    More about IO-Link in the pressure sensors from ARGO-HYTOS

    IO-Link makes actuators and sensors directly addressable and permanently provides you with data from their processes. IO-Link is the global standard for communication-capable interfaces. The long prevailing, confusing juxtaposition of signal and interfaces thus ended and is now unified by IO-Link.

    With IO-Link Safety and IO-Link Wireless, the communication protocol and interface directly brings enhancements for simplification in process engineering. Even with classic binary sensors, this significantly reduces the effort and costs for installations and operation.

    This downward compatibility is another major advantage of IO-Link. Existing architectures fit seamlessly into the new network, making the changeover easier for you. You don't have to rebuild your process technology. Instead, simply take it with you.

    You can easily integrate older point-to-point connections and standard cabling into IO-Link. For future new developments and redesigns, you will need fewer interfaces in your sensor technology.

    IO-Link provides you with three transmission rates and allows easy device replacement. A wired connection now only requires three wires of a parallel cable instead of up to 19, as was previously the case. In addition, the parameterization of your sensors with the control unit is now fully automatic.

    This and many other features and possibilities of IO-Link make your processes more efficient and faster. Above all, however, this standard saves you high costs. It makes your company fit for the future and Industry 4.0.

    Real-time information is indispensable in all company processes - including that of your actuators or sensors. Pressure sensors with IO-Link from ARGO-HYTOS provide you with this reliably.


    ARGO-HYTOS: Your expert for pressure switches

    Around the globe, world market leaders in the field of plant and mechanical engineering or for mobile machinery rely on components and systems from ARGO-HYTOS due to their high precision and reliability. ARGO-HYTOS is constantly developing itself and its products so that you can also develop further. Together we create progress. Please feel free to contact us if you have any questions or suggestions.

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