29 Water piping 1-Valve 2-Pressure meter 3-12 –Valves of the grower parts 13- Diffusion pump14-Thyristor15 – Chamber16 –Bottom17- Small cover18- Big cover19 -Rod20-Cutter21- Current lead 122- Current lead 223-34 –Thermal sensor of the elements35- Funnel
30 To set and fix with the bolts the column to the frame
45 Maintenance Checking for vacuum seals and junctions Checking of water cooling systemChecking for thermal screens and hot zone elements wearCorrection of crucible position
46 Safety measures Electrical safety There are the following sources of electric safety: chains of power supply of the component parts of the grower,panels and blocks with electric apparatus and electric equipment, located on the control panel, crystallizer, power cabinet.Protection of maintenance staff against electrical shock is provided by the doors which can be opened by special key and by protective grounding.There are grounding bolts with special marks on the doors of the power cabinet and control unit.
47 Danger of thermal burns. There are the following sources of thermal burns: the heater, screens and the melt surface at monitoring of crystallization front through non-protected window, therefore after termination of technological process it is allowed to open the grower only after its complete cooling.To protect the eye of process engineer from thermal irradiation at monitoring of seeding process it is necessary to use the light filter.