16 Intrinsically Safe Fieldbus Systems

16.1 INTRODUCTION

Fieldbus standard IEC 61158-2 defines the maximum dimensions for a fieldbus segment and its proper operation for the case of a safe area. These operations and calculations are for a network based on Foundation Fieldbus H1 or PROFIBUS-PA (MBP). Some additional constraints are imposed for proper operation of the network segment in the hazardous area for explosion protection as defined in IEC 60079.

16.2 Hazardous Area

In chemical industries in general and petrochemical industries in particular, which deal with oil and gases, a high degree of caution is always maintained because of the presence of flammable gases and oils. Heat and electrical arcing are the main reasons for fire/explosion ...

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