I am used to seeing conductance expressed as mhos. What are “Siemens” and how are they related to mhos?
Siemens has replaced the older expression of mhos used for expressing the basic units of conductance. One mho equals one Siemen. Units used to define conductance are: 1/ohm = 1 mho = 1 Siemen(S) = 1000 mS = 1,000,000 S. Back to Top • Can any standard be used for calibration? Thermo Fisher Scientific manufactures 4 standards for conductivity measurements. Four standard values are available: 12.9 mS standard (Orion 011006), 1413uS (Orion 011007), 100uS (Orion 011008) and 111.9 mS (Orion 011005). All of these are NIST Traceable Standards and come conveniently packaged as 5 X 60ML bottles. These are all recommended for use with Orion Conductivity meters for the most accurate calibrations. Alternatively, you can use other conductivity standards with the Orion conductivity meters. The Certificates of Analysis for Orion solutions can be obtained by specific lot code from the “Certificates of Analysis” button found on the homepage of this website. Back to Top • What are the differences in the
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