HAMILTON Conductivity Standards – leading in long-term stability

Although seemingly a minor matter, calibration and verification of conductivity sensors is far from simple. This is particularly the case with measurements in the low conductivity range, for which stable and reliable calibration standards have been completely lacking up to now. Since a conductivity standard is not a buffer solution, contamination or entry of CO has a much greater effect the lower the value of the conductivity standard. Hamilton is the first manufacturer to offer conductivity standards in 1. and 5 μS/cm with a certified accuracy of ±1 %, and a lifetime of 1 and years respectively. The composition of these standards is patented, and the procedure for determining conductivity has been developed in collaboration with DFM1). State metrological institutes that deal with measurement of electrolytic conductivity have become aware of Hamilton standards since they lie in a low conductivity range and exhibit the type of stability that has never been achieved before (see illus., Stability over years, with test measurements by PTB ). During an interlaboratory test among prestigious European metrological institutes (PTB , DFM, DKD ) Hamilton standards were used as a measurement solution.

Unique Advantages

• Stable for at least 1 year (1. μS/cm), up to years
• Certified standards with traceable calibration from DFM (can be viewed at www.hamiltoncompany.com/cert)
• Expiration date on every bottle
• Bottles can remain open for up to 60 minutes and retain the certified value.

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