About this manual
5
1.2.2
Pictographs
1.2.3
Instructions in the text
Work instruction: here you have to do something.
1.2.4
Abbreviations
DCU:
Display
Control
Unit
HPU:
Handheld Programming Unit
TC:
Electronic drive unit for turbopump
TPS:
Mains
pack
1.2.5
Symbols used
The following symbols are used consistently throughout the diagrams:
High vacuum flange
Fore-vacuum flange
Vacuum flange of the backing pump
Exhaust flange of the backing pump
Electrical connection
Sealing gas connection
Venting connection
Cooling water connection
Prohibition of an action to avoid any risk of accidents, the disregarding
of which may result in serious accidents
Warning of a displayed source of danger in connection with operation of
the unit or equipment
Command to perform an action or task associated with a source of dan-
ger, the disregarding of which may result in serious accidents
Important information about the product or this document
V
