Endress+Hauser ria45 - Page 29

RIA45 Commissioning
Endress+Hauser 29
t
Measured value
Hysteresis
Hysteresis
Setpoint
Setpoint
Setpoint
active
Setpoint
not active
A0010189-EN
 9 Outband operating mode
InBand
The limit value is violated as soon as the measured value to be checked drops below or
exceeds a minimum or maximum value specified beforehand. The hysteresis is located at
the insides of the band.
t
Measured value
Hysteresis
Hysteresis
Setpoint
Setpoint
Setpoint
active
Setpoint
not active
A0010192-EN
 10 Inband operating mode
Special situation: hysteresis and delay at one limit value
In special cases when the hysteresis and limit value display are activated, a limit value is
switched based on the following principle.
If the hysteresis and limit value delay are activated, the delay is activated when a limit
value is overshot and measures the time since the value overshoot began. If the measured
value drops back below the limit value, the delay is reset again. This also happens if the
measured value falls under the limit value but is still above the specified value of the
hysteresis. The next time the limit value is exceeded, the delay time becomes active and
starts measuring from 0.