Wika PGS23.160 Uživatelský manuál stáhnout pdf (Strana 13)

WIKA operating instructions pressure gauge model PGS with reed contacts

14000322.01 03/2011 GB/D/F/E

7. Contact protection measures

7.1. Inductive load with DC voltage

With DC voltage the contact protection can be achieved via a free-

wheeling diode, connected in parallel to the load. The polarity of the

diode must be arranged so that it closes when the operating voltag

e is on.

Example:

Contact protection

measure with free-

wheeling diode

Contact

Diode

Contact

7.2. Inductive load with AC voltage

With AC voltage two protection measures are possible:

Example:

Contact protec-

tion measure with

voltage-depend-

ent resistor VDR

Example:

Contact protection

measure with RC

element

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Wika PGS23.160 Uživatelský manuál Strana 13