Valco electronic Valve Oven ユーザーズマニュアル

The following table explains the symbols used on Thermo Finnigan instruments. 
Not all of them are used on the TRACE GC Ultra gas chromatograph and Valve 
Oven.

Direct Current

Alternating Current

Both direct and alternating current

Three-phase alternating current

Earth (ground) terminal

Protective conductor terminal

Frame or chassis terminal

Equipotentiality

On (Supply)

Off (Supply)

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