Siemens Maxum II Manual page 49

The circuits for the IS-TCD require special considerations to ensure that the circuit remains
intrinsically safe. For important information on the safe use of intrinsically safe circuits, refer
to the sections of this manual labeled "Intrinsically Safe Devices".
Figure 4-4
Explosion Protection Safety Standards
Manual, August 2017, A5E02220442001 Rev 8
Explosion Proof/Flameproof Thermal Conductivity Detector
Valves, Detectors, and External Systems
4.2 Detectors
49