1 Introduction
2 The intrinsic safety protection technique
3 Intrinsically safe systems
4 Intrinsically safe system control drawings
5 Entity concept
6 Entity parameters
7 Entity concept control drawings
8 Assessing the intrinsic safety of simple loops
9 Loop operation considerations
10 Special considerations for multi-channel associated
apparatus loops
11 Assessing the intrinsic safety of complex loops
12 Intrinsically safe apparatus that adds energy to the
loop
13 Considerations for intrinsically safe bus systems
14 Conclusion
15 References
Figures
1 - Example of a typical control drawing
2 - Control drawing for an intrinsically safe apparatus
examined under the entity concept
3 - Control drawing for an associated apparatus examined
under the entity concept
4 - Two-wire loop with neither conductor connected to
ground using two single-channel associated apparatus
5 - Two-wire loop with neither conductor connected to
ground using one dual-channel associated apparatus
6 - Control drawing for two-channel associated apparatus
with Vt and lt parameters
7 - Complex loop with two intrinsically safe apparatus and
three two-channel associated apparatus
8 - Control drawing for three two-channel associated
apparatus with Vt and lt
9 - Control drawing for intrinsically safe apparatus with
multiple circuits
10 - Control drawing for intrinsically safe apparatus
11 - Control drawing for hand-held communicator
12 - Typical intrinsically safe bus configuration