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YOKOGAWA SC450G |
YOKOGAWA SC450G
SC450 is designed to measure specific conductivity with contacting electrodes. This method is proven to offer very high measurement accuracy especially in pure and ultra pure water applications. This high accuracy is achieved in combination with well designed sensors that have a shielded field to assure a cellconstant that is not influenced by the installation of the sensor and not influenced by external fields.
The SC450 a has self tuning pre-amplifier to eliminate the measuring errors that are associated with system capacity of sensor and cabling or with polarization associated with high conductivities and cell fouling.
The integrity of the signal across the electrodes is monitored continuously to activate a call for maintenance or a fail message in the rare occasion that cell fouling would cause erratic readings.
The standard SC450 covers almost all Conductivity Applications including all special software functions in the standard analyzers to reduce the number of configurations. This results in less inventory and less training needs for users that have multiple Conductivity applications.
Some examples
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Demineralization: The standard SC450 has NaCl temperature compensation ** including the influence that dissociation of water molecules has on the Conductivity of the sample. The analyzer reads in Conductivity or in Resistivity units; readings in mS/m and mS/cm are possible and the output can represent traditional hyperbolic or logarithmic functions as well as bilinear. This is simply achieved by completing the 21 point output table. Demineralization also includes regeneration of the columns. SC450 is also equipped with temperature compensation methods to make this measurement accurate. Accurate measurement at high conductivities can be done with high cellconstants and/or with 4-electrode sensors. |
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Condensate monitoring: Condensate is ultra pure water alkalized with Ammonia or Morpholine. Accurate monitoring of condensate requires dedicated temperature compensation for these alkalizers. These curves are standard in the SC450. Condensate is also often sampled through a Cation column to remove the alkalizer and to amplify the signal that ingress of salts has on the Conductivity. Cation Conductivity analysis requires as well a dedicated Temperature Compensation and this is also available in all standard SC450 analyzers. |
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Water For Injection. This is an important application in the Pharmaceutical industry. Since USP23 it is possible to monitor the quality of this water on-line using Conductivity analysis. However the USP<645> describes precisely the maximum Conductivity per temperature range that is allowed. This table is present in the standard SC450 to guarantee full compliance to the USP requirements. |
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High Conductivities. Inductive Conductivity is the first method that comes to mind when high conductivity samples must be measured. Often overlooked is the 4-Electrode technique that allows high accuracy analysis of strong electrolytes with small and compact sensors. The SC450 offers especially for a 4-electrode measurement a S*C till 10000 mS*C in which C is themunique measuring range of 1 cellconstant. | |
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