Wika TSD-30 Manuel d'utilisateur télécharger pdf (Page 20)

20 WIKA operating instructions temperature switch model TSD-30

11613025.02 12/2011 GB/D/F/E

6.4 Switching functions

Hysteresis function

If the temperature uctuates around the set point, the hysteresis keeps

the switching status of the outputs stable. With increasing temperature,

the output switches when reaching the switch point (SP).

■

Contact normally open (HNO): active

■

Contact normally closed (HNC): inactive

With temperature falling again, the output will not switch back before

the reset point (RP) is reached.

■

Contact normally open (HNO): inactive

■

Contact normally closed (HNC): active

Window function

The window function allows for the control of a dened range.

When the temperature is between window High (FH) and window Low

(FL), the output switches on.

■

Contact normally open (FNO): active

■

Contact normally closed (FNC): inactive

When the temperature is outside window High (FH) and window Low

(FL), the output does not switch on.

■

Contact normally open (FNO): inactive

■

Contact normally closed (FNC): active

6. Commissioning, operation

Fig.: Hysteresis function

Fig.: Window function

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Wika TSD-30 Manuel d'utilisateur Page 20