Low-Level Conductivity Standards
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0.5, 1.0, 2.0, 5.0, 10.0 µS/cm For accurate pure water conductivity analysis. Important
levels fully bracketed.
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Aurical Company, Home of the gold Standard, manufactures and provides the Aurical
Low Level Conductivity Standards. These standards are essential for accurate conductivity
measurement in purified water. High accuracy is required for pure water and water
for injection in pharmaceutical manufacturing.
Methods for preparation of aqueous conductivity standards at these levels are well
established. However, traditional bottle packaging is not adequate for protection
and use. This is because carbon dioxide in the air dissolves in the standard and
changes the value. Bottle packaged standard is reliable for only one use. The remainder
must be discarded. The Aurical proprietary package overcomes this defect. The flexible
impervious package has a spout valve, which prevents room air from entering the
container. This means that the contents remain stable until the container is empty
allowing the full 500-mL for multiple calibrations and test.
Aurical Company makes these standards available at nominal values shown below. The
actual value and tolerance is provided on the label for each lot. Each container
of each lot is individually tested. The actual value and tolerance is the mean and
two standard deviations of the lot testing. These values are traceable to NIST SRMs
or the NIST Absolute Conductivity Method. Common single-shot standards cannot be
evaluated in this manner, nor can they avoid instant air CO2 contamination when
used. Where Aurical standards are definitive, single shot standards are only rough
estimates at best. Aurical Standards permit multiple samples from the same package,
helpful for validation.
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