YSI IQ S ENSOR N ET DIQ/S 182 XT - Manual (Page 125)

System 182 Outputs
6 - 29 ba76022e01 12/2011
Application example  Feedback control of the D. O. concentration
 Sensor: TriOxmatic 700 IQ (measuring range: 0 ... 60 mg/l)
The control parameters form the following (negative) characteristic
curve:
Fig. 6-14 Characteristic curve for application example
The controller works with the following gain:
Control parameters Value
Nominal value 4 mg/l
Xp 10 % of the measuring range or 6 mg/l
Imin 8 mA
Imax 14 mA
Io 12 mA
ti 0 s (no I controller part)
td 0 s (no D controller part)
0
8
14
12
Imax
Imin
Current I [mA]
Measured value [mg/l] 4 2 8
Io
Nominal value
Xp
mg/l
mA
1
mg/l 6
mA 6
K = =