Commutation Modes On The 8400 - Burkert 8400 Manuel Utilisateur

Adjustmentandfunctionalities
9.7.1.

commutation modes on the 8400

Two commutation modes on the transistor or relay are available:
- hysteresis mode;
- window mode.
In hysteresis mode (see Fig. 26), the status of the transistor or relay
is changed:
- on detection of the high threshold (O HI) when the measured
temperature increases
- on detection of the low threshold (O LO) when the measured
temperature decreases.
Not inverted
Contact
ON
OFF
T°
OLO OHI
Fig. 26: Changing the output in hysteresis mode
Type 8400
Inverted
Contact
ON
OFF
OLO OHI
In window mode, the status of the transistor or relay output is
changed whenever one of the thresholds is detected (see Fig. 27).
Contact
ON
OFF
OLO OHI
Fig. 27: Changing the output in window mode
The time delay before commutation (DEL) is valid for both output
thresholds. Commutation is done if one of the thresholds (O HI, O
LO) is exceeded for a period longer than the time delay prior to com-
mutation, DEL (see Fig. 28).
T°
Not inverted
Contact
ON
OFF
T°
OLO OHI
english
Inverted
T°
31