51
Operating and commissioning
Type 8228
PVAR: choose a measurable variable (impedance in W.cm, conductivity in S/cm, temperature in °C, temperature
in °F or total dissolved solids in ppm) associated with transistor output 1 resp. transistor output 2 or associate
the “warning” message (see chap. 9.12.4, chap. 9.13.2 and chap. 9.13.3) with transistor output 1 resp. transistor
output 2.
If the selected transistor output is linked to the "warning" event, the transistor switches as soon as such an event
is generated by the device.
See also chap. "10.3 Solving a problem".
MODE: choose the operating, hysteresis or window, for transistor output 1 or transistor output 2 (see Fig. 34 and
Fig. 35).
LOW: enter the low switching threshold value for transistor output 1 or transistor output 2 (see Fig. 34 and
Fig. 35).
HIGH: enter the high switching threshold value for transistor output 1 or transistor output 2(see Fig. 34 and
Fig. 35).
CONTACT: choose the type of off-position (normally open, NO, or normally closed, NC) of transistor output 1 or
transistor output 2 (see Fig. 34 and Fig. 35).
DELAY: choose the value of the time delay prior to switching, for each transistor output.
Switching only occurs if one of the thresholds, high or low (functions “High” or “Low”), is exceeded for a duration
longer than this time delay (see Fig. 34 and Fig. 35). The time delay before switching is applicable to both output
thresholds.
Hysteresis operating
The change of status is done when a threshold is detected (increasing measured value: threshold high (function
High) to be detected; decreasing measured value: threshold low (function Low) to be detected).
NO = normally open NC = normally closed
contact
Low High
process value
contact
Low High
process value
Fig. 34: Hysteresis operating
Window operating
The change of status occurs whenever one of the thresholds is detected.
NO = normally open NC = normally closed
contact
Low High
process value
contact
Low High
process value
Fig. 35: Window operating
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