YSI IQ S ENSOR N ET MIQ/C6 - Manual (Page 23)

MIQ/C6 Settings
4 - 11 ba76033e01 01/2012
Within the proportional band, a concentration increase by 1 mg/l
causes a decrease of the current output by 1 mA. If, for example, the
measured concentration is 5 mg/l, 11 mA are output:
The highest concentration with which the controller works within the
proportional band is 8 mg/l (corresponding to Imin = 8 mA), the lowest
one is 2 mg/l (corresponding to Imax = 14 mA).
Settings
( )
mg/l mg/l
mg/l
mA
1 mA 12 I
Controller
5 4
− ⋅ + =
( )
mA 11 mg/l 1
mg/l
mA
1 mA 12 I
Controller
= − ⋅ + =
Setting Selection/Values Explanation
Measured variable Main variable
Adjoining variable Main variable
designates the actual
measured parameter
of the sensor (e.g.
pH, oxygen, etc.).
Adjoining variable
designates an
additional measured
parameter (e.g.
temperature).
Nominal value within the measuring
range (sensor-
dependent) Nominal value the
measured value is
regulated to
Xp 5 ... 100 %
-5 ... -100 %
of the measuring
range Proportional band of
the controller.
Negative values
result in a positive
characteristic curve.
Imin 0 ... 20 mA Lower current
limitation *
Imax 0 ... 20 mA Upper current
limitation *
* Note:
Spacing between
Imin and Imax:
at least 5 mA