Coulometric device within a unit for state primary standards

The operating principle and composition of the VNIIFTRI coulometric device is based on a three-chamber electrochemical cell of vertical construction that is part of the set of primary state standards for the pH scale and indices of pX ion indices. Metrological characteristics of the device ensure reproducibility of pH in the standard with an error of not more than 0.003 in the range of pH = 1.0–12, and this corresponds to the best world analogs.     

State primary standard for the units of volume density of electrical charge of ionized air and the number density of air ions state standards

The operating principle and structure of the state primary standard for the units of volume density of electrical charge in ionized air and of the number density of ions in air, GET 177–2010, are described. Its areas of application are demonstrated. The characteristics of the most widespread air ion counters and of industrial and household ionizers are discussed.     

Physical quantities and units in gas analysis

Translated from Izmeritel'naya Tekhnika, No. 7, pp. 55–57, July, 1990.