Siemens Maxum II Manual page 40

Safety Systems - Oven
3.4 Isothermal Airless Oven Heater System (Split)
Channel
for Heating
Element
Figure 3-5
The heating elements are enclosed in hollow tubes running diagonally down the side of the
aluminum casing. The heating elements are inserted in the tubes from the top. During
operation, the open ends of the heating element tubes (which can be seen in Figure 3-4) are
equipped with screw-in, heat-retaining, explosion-proof plugs (figure 3-6) which prevent
flammable gases from contacting the hot surface of the heating element if the oven door is
opened. These plugs must be fully screwed in such that the threads are fully engaged.
Figure 3-6
40
Location of Temperature Probes and Heaters on Airless Oven
Heat Retainer Plug for Airless Oven
Insert Location
for RTD Probe
(Same as on
Opposite Side)
Explosion Protection Safety Standards
Manual, August 2017, A5E02220442001 Rev 8