Transmitter 9125 – Conductivity / resistivity measurement
Page 45
The TAB menu is used to configure the stored
USP curve: W.F.I. (Water For Injection) or P.W.
(Pure Water).
USP mode
USP is a standard used in the pharmaceutical industry.
It recommends the use of a non temperature-
compensated conductivity measurements and sets the
upper limits of acceptable conductivity for USP-
compliant water according to temperature. The alarm
delivered therefore varies according to the measured
temperature. For this, the instrument possesses two
stored curves:
a curve (W.F.I.) for conductivity measurements in
high purity water or for injectable preparations
(cf. table 1),
a curve (P.W.) for conductivity measurements in
purified water (cf. table 2).
NB:
This function is only possible in 2 electrode
measurements and when temperature
compensation has been deactivated.
T°C
Non-
compensated
conductivity
PS/cm
T°C
Non-
compensated
conductivity
PS/cm
T°C
Non-
compensated
conductivity
PS/cm
0
0.6
35
1.5
70
2.5
5
0.8
40
1.7
75
2.7
10
0.9
45
1.8
80
2.7
15
1.0
50
1.9
85
2.7
20
1.1
55
2.1
90
2.7
25
1.3
60
2.2
95
2.9
30
1.4
65
2.4
100
3.1
Table 1 - Temperature curve and conductivity requirements
for high purity water or for injectable preparations (non
temperature-compensated conductivity measurements).
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