Our upgrade for functional safety

In order to meet the high requirements for functional safety, the TB225 is not only suitable for use with all approved sensors in accordance with DIN EN 14597 but has also been revised with regard to compliance with EN 61508 for SIL (Safety Integrity Level). It is now the only temperature limiter in its price segment to attain SIL 2. In addition, users will be relieved of time-consuming research, as there will be manufacturer certificates for SIL-certified safety process lines consisting of sensor and evaluation unit, depending on the device and sensor. Since the decisive characteristic values and failure probabilities are thus known, all that is left to do is select the appropriate actuator.

Less storage, less space required
Due to the integrated wide-range power supply, the TB225 can handle direct and alternating current in single model and is therefore universally applicable. Significantly fewer variants must be kept in stock, which also reduces storage and costs accordingly. The temperature limiter saves space not only in the storage but also in the control cabinet thanks to its slim and compact design.

  • Greater economy
    the TB225 offers affordable SIL2 safety

  • Universal application possibilities and low storage costs
    the wide-range power supply and the many variants offer high flexibility

  • Less space required
    due to its compact design and DIN rail mounting, the TB225 can be used even in cramped installation situations

  • Safe and simple configuration and easily recognizable safety-relevant process values
    the well-structured plain text display offers safety and maximum convenience

  • Clear error detection
    in case of alarm, the display changes color to red

Your technical adviser from Martens
"To protect people, the environment, plants and process goods, temperature limiters such as the TB225 are used, among other devices, as the 'last' safety mechanism in the area of thermal process technology and monitoring."

Your technical adviser from Martens

Well-advised with the GHM GROUP.


Do you need additional information? We will be happy to advise you on all aspects of our products and solutions. If you have any questions, please use our contact form. Our service team will reply promptly with important tips and technical information.

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Safe and easy configuration

Double thermocouples and Pt100 sensors as well as standard signals (0/4..20mA or 0/2..10V) can be connected via the universal inputs. The safety function is provided via the main relay with a fully configurable threshold value. To enable a pre-alarm, a secondary relay with independently adjustable limit value is provided for additional signaling. In addition, there is an analogue output which can be individually configured within the measuring range of the temperature input. The TB225 also features a safe 3-way galvanic isolation between input, output and auxiliary voltage to minimize interference signals.

Thus, users benefit from a compact, easily configurable and universally applicable temperature limiter that offers certified SIL 2 safety at an unbeatable price. Including a high-quality service which is available quickly and directly from the GHM GROUP.

More information on industrial electronics​​​​​​​​​​​​​​

Clear error detection and process values in plain text display.

Clear error detection and process values in plain text display.

The TB225's well-structured plain text display makes it easy to identify all safety-relevant process values. For fast and clear troubleshooting, the display switches to red in case of an alarm. Since the description of all parameters is also distinct, the configuration can be carried out very easily without the need for an instruction manual or a PC. 

A whole range of our compact solutions with functional safety.

More about our products

GHM GROUP – where quality and variety are the key variables

GHM Messtechnik GmbH is a leading specialist and full-range supplier for innovative measurement and control technology. With a global focus and passionate employees, the company develops and produces a wide range of more than 2,000 high-quality device types for all essential areas of industrial sensors and electronics.

The customer is the company's primary focus

The GHM GROUP continues in its consistent efforts to permanently advance measuring and regulation technology with innovative developments and application-specific solutions with high customer value.

Efforts are centred on the development of customer-oriented solutions that are appropriate for the market and tailored to the high demands of industry and producing industry.


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You can reach us by phone Mo-Th from 7:00 am to 5:00 pm and
Fr from 7:00 am to 4:00 pm.


GHM Messtechnik GmbH  |  GHM GROUP – Martens
Kiebitzhörn 18  |  22885 Barsbüttel  |  GERMANY