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IM 12D08N04-01E
10-5
10. Appendix
Setting up SC402G for USP item 645 monitoring
First enable USP item 645 in service code 57. Change the setting from 0 (default) to 1
(enabled).
This activates uncompensated conductivity in the display menu. The E13 alarm feature
is also enabled. For E13 the FAIL alarm (S4) is triggered when the uncompensated
conductivity exceeds the relevant value in the graph.
USP warning alarms can be selected for any of the 4 relay outputs.
Service codes 40 to 43 are for these alarms. The setpoint is the safety margin in %, and
is set as described in sections 5-1-3 & 5-2-2.
Temperature in
°
C
0 25 50 75 100
microSiemens/cm
3.5
3
2.5
2
1.5
1
0.5
0
Fig. 10-1.
Conductivity limit as a function of Temperature as per USP item 645
(Conductivity with no temperature compensation)