Process Unit 73 LF - Knick
Process Unit 73 LF - Knick
Process Unit 73 LF - Knick
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<strong>Process</strong> <strong>Unit</strong> <strong>73</strong> <strong>LF</strong><br />
System Functions<br />
10 11<br />
1<br />
cond<br />
24 V<br />
=<br />
power<br />
output<br />
<br />
=<br />
power<br />
supply<br />
RS485<br />
9<br />
2<br />
temp<br />
<strong>Process</strong> <strong>Unit</strong> <strong>73</strong> <strong>LF</strong><br />
cleaning<br />
contacts<br />
controller/<br />
limit values<br />
NAMUR<br />
contacts<br />
mA<br />
8<br />
3<br />
mA<br />
mA<br />
mA<br />
7<br />
4 5 6<br />
Fig. 1–1<br />
System functions <strong>Process</strong> <strong>Unit</strong> <strong>73</strong> <strong>LF</strong><br />
Fig. 1–1 shows the versatile system functions.<br />
You can connect 2- or 4-electrode cells (1) and a<br />
temperature probe. (2)<br />
The optional concentration function allows to calculate<br />
and display substance concentrations for<br />
certain solutions.<br />
Cell standardization is performed automatically<br />
by determining the cell constant, by entering a<br />
known conductivity value, by direct input of the cell<br />
constant, or by sample calibration.<br />
Accuracy of conductivity measurement and concentration<br />
determination can be further increased<br />
by compensating for the measured temperature.<br />
The instrument provides two galvanically isolated<br />
standard current outputs (0(4) to 20 mA) (7 and 8),<br />
which can each be assigned to conductivity, concentration<br />
or temperature. Optionally, the current<br />
output 2 (7) can also be used as analog controller<br />
output.<br />
A standard current input (0(4) to 20 mA) (3) (gal-<br />
1–2 Overview
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