Endress+Hauser Mycom CLM 152 Operating Instructions Manual page 46

Instrument configuration
Current output signal
with logarithmic
Fig. 7.4 characteristic
44
Sensor Range 20 mA input
CLS 50 200 mS/cm – 1000 mS/cm
CLS 52 2.00 mS/cm – 1000 mS/cm
0.200 µS/cm – 200.0 µS/cm
k = 0.01
2.00 µS/cm – 2000 µS/cm
k = 0.1
20.0 µS/cm – 20.00 mS/cm
k = 1
200 µS/cm – 200.0 mS/cm
k = 10
k = 0.01
200 kΩ cm – 20.00 MΩ cm
k = 0.1
20.0 kΩ cm – 2000 kΩ cm
k = 1
2.00 kΩ cm – 200.0 kΩ cm
The minimum current output spread TD is determined by the switching step in which the knee point is located.
It is 10% of the switching step end value (see Table »linear«).
The measured value for the knee point must be less than (20 mA value – TD).
The 0/4 mA value must always be defined as 0 S/cm.
C) Logarithmic current output signal characteristic
20
12
(10)
4
I = 4 (0) mA + 8 (10) mA log
(0)
0 20
Input range of knee value
Conductivity
20.0 µS/cm – 200.0 mS/cm
200 µS/cm – 200.0 mS/cm
20.0 nS/cm – 20.00 µS/cm
0.200 µS/cm – 200.0 µS/cm
2.00 µS/cm – 2000 µS/cm
20.0 µS/cm – 20.00 mS/cm
MΩ
20.0 kΩ cm – 2000 kΩ cm
2.00 kΩ cm – 200.0 kΩ cm
0.200 kΩ cm – 20.00 kΩ cm
Values in brackets for
CD value
100
current output 0...20 mA
20 mA value
40 60
Current output meas. range [%]
Mycom CLM 152
80 100
i_out_lg.cdr
Endress+Hauser