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• Using the Stage 1 temperature and conductivity requirement table the corresponding conductivity
limit at that temperature is determined.
• If the measured conductivity is not greater than the table value the water meets the requirements
of the test for conductivity. If the conductivity is higher than the table value, proceed with Stage 2.
Stage 1 table
Temperature and conductivity requirements *
(for the non‑temperature compensated conductivity measurements only)
Temperature
°C
Conductivity
µS/cm
0
0.6
5
0.8
10
0.9
15
1.0
20
1.1
25
1.3
30
1.4
35
1.5
40
1.7
45
1.8
50
1.9
55
2.1
60
2.2
65
2.4
70
2.5
75
2.7
80
2.7
85
2.7
90
2.7
95
2.9
100
3.1
(*) Values from USP ‑ NF Fifth Supplement
USP MEASUREMENT
Physical Tests / Water Conductivity (645) 3465‑3467