Signifying a breakthrough in digital safety limiters for thermal applications, Martens, a member of the GHM Group, has introduced the Safety-TL4896 for switch panel installation. “The Safety-TL4896 is innovation at its best, offering users a host of cost and resource savings,” comments Jan Grobler, managing director of GHM Messtechnik South Africa.
Representing a first in digital safety temperature limiters available worldwide, the Safety-TL4896 complies with all relevant European safety regulations. It has a reaction time of 0,5 seconds, shutting down the system if it detects an unsafe condition, and will ensure continuous operation with the added feature of a pre-alarm in the event of temperature fluctuation. A front panel LED indicates alarm conditions, complemented by information on the backlit display that identifies the cause in plain text.
The Safety-TL4896 satisfies all DIN EN14597 requirements and has been issued with a SIL2 certificate. Other key features include:
• The instrument operates as an indicator since it can be installed directly in the control panel instead of on the top rail. Therefore, any additional indicator element can be omitted.
• The integrated temperature output signal eliminates the need for additional interfaces to the PLC or scada.
• The reset function is executed directly on the device, thus no additional control element is needed.
• Configuration of the unit takes place directly from the front buttons and graphic display, eliminating the need for any additional interface devices and software.
“The Safety-TL4896 represents a first for thermal applications that enhance plant performance within the bounds of compliance to local regulations,” concludes Grobler. “The addition of the pre-alarm, which triggers before the actual alarm limit is reached, makes it possible to initiate corrective active at an early stage thus avoiding unnecessary plant shut-downs.”
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