Siemens Maxum II Manual page 51

Figure 4-6
Figure 4-7
Explosion Protection Safety Standards
Manual, August 2017, A5E02220442001 Rev 8
Flame Ionization Detector (without Insulation and Cover)
Flame Photometric Detector (without Insulation and Cover)
Valves, Detectors, and External Systems
4.2 Detectors
51