Burkert Type 8041 - Manual (Page 42)

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Adjustmentandcommissioning
The wiring of the relay determines the function of the relay:
Normally Open (NO) or Normally Closed (NC).
The following parameters of the relay output can be set:
- the switching way: window or hysteresis (see chap. 9.9.1)
- the value of the low switching threshold, as a percentage of the
full scale (see chap. 9.9.2)
- the value of the high switching threshold, as a percentage of
the full scale (see chap. 9.9.2)
- the time delay before switching: from 0 to 100 seconds (see
chap. 9.9.3).
9.9.1. choosing the switching way of the
relay output
Two switching ways of the relay are available, window or hysteresis.
In window switching, the state of the relay output is changed
whenever one of the thresholds is detected (see Fig. 35 and
Fig.
36).
State of the relay output
deactivated
actived
Low threshold High threshold
m/s
Fig. 35: Change of state of the relay output in window switching
with a relay wired as NO
State of the relay output
deactivated
actived
Low threshold High threshold
m/s
Fig. 36: Change of state of the relay output in window switching
with a relay wired as NC
In hysteresis switching (see Fig. 37 and Fig. 38), the state of the
relay output is changed:
• when both the high threshold is detected and the fluid velocity
increases;
• when both the low threshold is detected and the fluid velocity
decreases;
State of the relay output
deactivated
actived
Low threshold High threshold
m/s
Fig. 37: Change of state of the relay output in hysteresis switching
with a relay wired as NO
English
Type 8041