Endress+Hauser NRF81 - Page 205

Tankside Monitor NRF81 Operating menu
Endress+Hauser 205
Hysteresis
The level of the product in a tank is not constant but slightly varies, due for example to
filling disturbances. If the level oscillates around the changeover level (Minimum level),
the algorithm will constantly switch between calculating the value and holding the
previous result. To avoid this effect a positional hysteresis is defined around the
changeover point.
Hmin
Hr
1
2
A0028720
 54 HTG hysteresis
1 Value calculated
2 Value held/manual
H
min
Minimum level
H
r
Hysteresis (→  208)