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8.3 USP Function (Contacting mode)
The Mycom CLM 152 is able to measure and monitor uncompensated conductivity
according to the USP (United States Pharmacopeia) guidelines.
When equipped with the USP option, the instrument fulfills the USP requirement of
measuring conductivity and monitoring for deviation at the same time.
The monitoring function is automatic and can be enabled via the Commissioning menu.
USP Requirements on Measurement
The following measurement procedure is employed:
The measurement is performed uncompensated, and the current measured value is
compared to a reference value for pure water (see table below).
If the values measured exceed the reference values, an alarm condition is signalled via
the USP contact.
The transmitter must fulfill the following USP requirements for a quasi-compensation:
Temperature measurement at the place of the conductivity measurement
Temperature is to be rounded down to the next 5°C step.
The valid monitoring value is to be determined via a table (see table below)
Alarm signalling when the limit is exceeded
Temperature (°C) Conductivity (µS/cm) Temperature (°C) Conductivity (µS/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
The USP function can be activated in the Commissioning / System set-up / Output
relays menu.
The following settings can be adjusted following activation:
® Commissioning (Start-up)
® USP contact
Function Selection Factory setting
Hysteresis Entire measuring range 0 µS/cm
Pickup delay 0 to 60 s 0 s
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