Siemens Maxum II Service Manual page 18

Flame Photometric Detector
Figure 3-2
Combustion Chamber
● The burner nozzle consists of two annular gaps. The combustion gas H
outer annular gap and mixes with the combustion air from the inner gap. The carrier gas
flows from the nozzle into the dome-shaped flame.
● The exhaust is taken from the combustion chamber output via a flameproof joint.
● The glow plug is located above and to the side of the burner.
Optics
● The flame burns in a recessed area shielded from the fiber optic interface.
● The fiber optic cable connects to the photo multiplier tube (PMT) module in the EC.
● The optical interference filter is built into the PMT module
● All connections between the combustion chamber and the photomultiplier are absolutely
light-tight.
● The ignition cable of the FPD is routed through an EEx-e feed through to the EC.
Heater
The FPD is supplied with an external heater. Condensation would be formed in the FPD at
temperatures below 80°C and have a negative influence on the measuring properties. The
detector is insulated to prevent moisture from entering it.
18
Flame Photometric Detector Major Components
flows out of the
2
Maxum Edition II Detectors
Service Manual, May 2018, A5E42019847001