Usp Mode - Hach POLYMETRON 9125 Operator's Manual

Transmitter 9125 – Conductivity / resistivity measurement

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:
NB:
This function is only possible in 2 electrode
measurements
compensation has been deactivated.
T°C
0
5
10
15
20
25
30
Table 1 - Temperature curve and conductivity requirements
for high purity water or for injectable preparations (non
temperature-compensated conductivity measurements).
The TAB menu is used to configure the stored
USP curve: W.F.I. (Water For Injection) or P.W.
(Pure Water).
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).
and
Non- T°C Non-
compensated compensated
conductivity conductivity
S/cm
0.6 35
0.8 40
0.9 45
1.0 50
1.1 55
1.3 60
1.4 65
when temperature
T°C Non-
compensated
conductivity
S/cm S/cm
1.5 70 2.5
1.7 75 2.7
1.8 80 2.7
1.9 85 2.7
2.1 90 2.7
2.2 95 2.9
2.4 100 3.1
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