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JUMO safety temperature limiters/monitors with ATEX approval

25 June 2012

New safety temperature limiters/monitors (safetyM STB/STW Ex) with ATEX approval from JUMO represent the latest state of the art in safety engineering, the company says, and complete the JUMO product portfolio in this area. They can now also be used for reliable and early detection of potential dangers in Ex zones. 

The instruments are available in versions
- Ex II (1) G [Ex ia Ga] IIC and 
- Ex II (1) D [Ex ia Da] IIIC 

The primary tasks of safety temperature limiters are to monitor thermal processes and to bring systems to a safe operating state in the event of a malfunction. 

Other than previous approvals according to DIN EN 14597, SIL 3, PL e (Performance Level), and GL JUMO devices now have ATEX approval as well and can therefore also be used in Ex zones. 

The inputs are intrinsically safe [Ex ia] so that the corresponding probes can be directly connected. Therefore the use of a barrier is no longer necessary. The instrument is also certified according to DIN EN 50495 and DIN EN 13463-6 as an ignition source monitor (iPL 2) according to the ATEX directive. 

The new JUMO safety temperature limiter/monitor can be used to monitor critical processes in potentially explosive gas and dust atmospheres. 

It also meets the highly demanding requirements of DIN EN 61508 or DIN EN ISO 13849 due to a device concept that ensures reliable detection of errors thanks to its 1oo2D structure. As a result, it can also be used for applications based on the new Machinery Directive 2006/42/EC. 

The bright, clearly structured display with clear text display and background lighting ensures - in connection with the keyboard - a fast and uncomplicated configuration directly on the device. The menu structure is clearly arranged so that users can handle the safetyM STB/STW Ex safely and with ease. Thereby the startup time can be reduced. All safety-relevant process values are displayed, showing the most important functions with simple pictograms. 

A mini-USB connector is available at the front for the configuration with a PC or laptop. LEDs indicate whether the system is operating without errors or whether a pre-alarm or limit value alarm has been triggered.

The measurement input has a wide range of linearizations. It is freely configurable for RTD temperature probes, thermocouples, as well as current, voltage, and differential measurements. Two relay outputs (pre-alarm and limit value alarm) switch the process to a safe state in case of an error.

The system is re-enabled by an internal or external reset button as part of the limiter function.

Process values can be transferred to a recorder, controller, or higher-level control system using the standard analog output. 

Additional features such as password-protected access and adjustable level inhibit increase operational security and ensure greater safety for your process.

Power supplies are available from AC 110 to 240 V (-15/+10 %), 48 to 63 Hz, or AC/DC 20 to 30 V, 48 to 63 Hz.

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