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Conductivity Polarization monitoring
Polarization effects in the boundary layer between the sensor and the solution to be measured limit the
measuring range of conductive conductivity sensors.
The transmitter can detect and indicate polarization effects using an innovative, intelligent signal evaluation
process.
United States Pharmacopeia (USP) and European Pharmacopoeia (EP)
The requirements on ultrapure water in the pharmaceutical industry are specified by the American USP and
the European EP.
The transmitter meets the USP/EP requirements on conductivity measuring systems:
• Precise temperature measurement at point of conductivity measurement
• Simultaneous display of uncompensated conductivity values and temperature possible
• Display resolution 0.01 μS/cm
• Exact adjustment of the transmitter in the factory with traceable precision resistances (optional)
• Exact adjustment of the sensors in the factory in accordance with ASTM D 1125-9 resp. ASTM D 5391-99
(optional)
• Temperature-dependent measured value monitoring acc. to USP and EP.
The "Advanced Plus" software package provides the limit value functions for pharmaceutical waters acc. to USP
and EP:
• Water for Injection (WFI) acc. to USP <645> and EP
• Highly purified water (HPW) acc. to EP
• Purified water (PW) acc. to EP
The uncompensated conductivity value and the temperature are measured with the USP and EP limit value
functions. The measured values are compared with the tables described in the standards. If a limit value is
exceeded, an alarm is displayed. Additionally, a pre-alarm can be defined to indicate undesired operation states
before they occur.
Oxygen Suitable sensors
Amperometric sensors:
• with Memosens technology
• 12 and 40 mm design
Aplication-optimized calibration models
The transmitter offers separate functions for zero-point calibration and slope calibration. This allows for
optimum adaption to the process.
The calibration models range from simple slope calibration in vapour-saturated air to slope calibration with
indication of absolute air pressure and relative humidity at measuring place.
The latter model allows you to calibrate during operation as well as during sterilization or cleaning.
The transmitter has individual calibrations and sterilizations counters for sensor and membrane cap. The
counter for the membrane cap can be reset after each cap replacement.
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