108
According to the “USP” directive (U.S.Pharmacopeia), Section 645
“Water Conductivity” the conductivity of pharmaceutical waters can
be monitored online. To do so, the conductivity is measured without
temperature compensation and is compared with limit values (see
table on next page).
The water is usable when the conductivity is below the USP limit. If the
conductivity values are higher, further test steps must be performed
according to the directive.
Configuring:
•
SNS
menu group:
When “USP function“ has been selected, the measuring range
is fixed to 00.00.....99.99 μS/cm. Temperature compensation is
switched off. Temperature is monitored.
If the USP limit is exceeded, a 22 mA signal is output.
USP Function
Temperature/Conductivity Table as per USP
Temp (°C)
Cond (
μ
S/cm) Temp (°C)
Cond (
μ
S/cm)
0
0.6
55
2.1
5
0.8
60
2.2
10
0.9
65
2.4
15
1.0
70
2.5
20
1.1
75
2.7
25
1.3
80
2.7
30
1.4
85
2.7
35
1.5
90
2.7
40
1.7
95
2.9
45
1.8
100
3.1
50
1.9
Содержание Stratos Pro A201COND
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