SB02A: The Reliable Safety Barrier

The SB02A Zener barrier combination comprising three distinct barriers of types Z040, Z041, and Z042, was specifically developed for the use of load cells with WTX weighing terminals. It is characterized by a low line resistance in the excitation lines and can be installed on a 35-mm DIN rail as per EN 60715.

It is their task to limit the energy transmitted from the non-Ex area to the Ex area, both in normal operation and in the event of a fault. The barrier limits the current and voltage in the intrinsically safe circuit if the voltage on the non-intrinsically safe side reaches excessively high values or if a short circuit occurs on the intrinsically safe side.

For this circuit arrangement, the BASEEFA (British Approvals Service for Electrical Equipment in Flammable Atmospheres) has granted a system Certificate of Conformity (BAS 09.0142 IECEx and BAS 01.7005 ATEX), which is in accordance with the values for inductance and capacitance stipulated in the declaration of conformity Ex Guide 16 ATEX 0001.

Reliable measurement

  • Three optimized safety barriers for intrinsically safe installation, for use with all common SG transducers such as HBM strain gauge load cells
  • Protective separation from Zone 2 non-hazardous and hazardous areas in accordance with Statement of Conformity TÜV 99 ATEX 1484 X II 3G Ex nA IIC T4 Gc

Reliable use, due to certified EC type-examination certificate

Safe handling

  • For measuring amplifiers with DC sensor supply balanced to ground
  • Can be used with the HBM WTX110 and WTX120 systems
  • Detailed documentation including circuitry and wiring diagrams

Specially matched to HBM sensors and HBM measuring amplifiers

EC type-examination certificates

  • ATEX BAS01 7005
    • II (1) GD: [Ex ia Ga] IIC (-20°C ≤ Ta ≤ 60 °C)
    • II (1) GD: [Ex ia Da] IIIC (-20°C ≤ Ta ≤ 60 °C)
    • I (M1): [Ex ia Ma] I (-20°C ≤ Ta ≤ 60 °C) 
  • IECEx BAS 09.0142
    • [Ex ia Ga] IIC, [Ex ia Ma] I

Suited to be used in many regions and applications in process and factory automation

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Safety barriers EEx ia II C


SB02A Product Literature

Title / DescriptionLanguage
Data Sheets
Safety Instructions
German, French, English
Declaration of Conformity
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