Trace Moisture Standards in Reactive Gases

Span Pac™ H2O-R Moisture Standards Generators from KIN-TEK (USA) create known calibration standards of trace moisture in reactive gases such as chlorine and HCL. These systems use Trace Source™ permeation tubes to dynamically add a known amount of water vapor to a flow of dried reactive matrix gas.

Concentrations from < 10ppb to over 100ppm are possible by selecting suitable permeation tubes. At any concentration level, multi-point calibrations over a 400:1 range are easily achieved.

The Span Pac™ H2O-R method is based on the standard additions technique. A small flow of dry inert gas flows over the Trace Source™ permeation tube to create a base moisture standard. A variable portion of the base mixture is added to a flow of the reactive gas to form the calibration standard. Calibration is based on the change in concentration due to addition of moisture from the Trace Source™ permeation tube. This method compensates for residual moisture in the dry matrix gas. Mixture concentrations are traceable to NIST through physical standards.

Applications include on site moisture monitor calibration and production of controlled atmosphere for catalysis studies, corrosion rate studies and filter capacity tests.