AADCO has developed a family of gas purifiers, supplementing the AADCO line of hydrogen and pure air generators, which are specifically designed to accommodate any laboratory's requirements for clean gases. Specific units purify particular gases so that one need never worry about getting in a "bad" cylinder. Not infrequently you may receive one or more. cylinders of gases from your supplier which are labeled ULTRAHIGH PURITY only to find that instrumentation which has been customarily producing meaningful data suddenly begins to behave erratically. Tracking the source of the problem is a simple matter if only one cylinder of gas has been changed. You simply revert to the original cylinder and the performance becomes as before, provided the offending cylinder was not so badly contaminated as to make unusable an expensive 2-stage regulator or has not polluted the entire flow system of the receiving equipment. Should more than one cylinder have been changed, the problem is further compounded while you seek out the "bad" cylinder or cylinders. This rapidly becomes an object lesson that a label of Ultra High Purity or Zero Grade will sometimes hold empty promise and deliver a seeming non-ending series of problems. Working through a batch-of cylinders to find one or two which will prove satisfactory is oftentimes an unrewarding exercise. AADCO's gas purifiers are designed to assure the user that any cylinder will be just as good as the best cylinder without the worry or expense. It no longer becomes necessary to purchase only the highest grade of gases, with their contingent worry as to purity.

Most laboratory instrumentation can become badly contaminated -with impure gases,. necessitating complete dismantling and rebuilding of the flow systems. Dirty helium or nitrogen can. seriously contaminate the complete carrier gas flow system in any gas chromatograph. Impure hydrogen will cause rapid deterioration of any Nickel catalyst system used in the conversion of CO or C02 to methane and cause nonreproducibility. It will also cause extremely high backgrounds from flame ionization detectors and make almost inoperable some Total Organic Carbon Analyzers used in water analysis. Other detection systems adversely affected by impure hydrogen are: the Hall Detector, the Dohrmann microcoulometric systems, Dohrmann TOC systems, Phosphorus/Nitrogen thermionic detectors and flame photometric systems. Optimum performance from all of the above will be commonplace with pure hydrogen.

HYDROGEN

The AADCO model 560 Hydrogen Purifier will accept hydrogen from any source (other than those laden with any sulfur compounds) and deliver hydrogen, under pressure, of such purity as to defy detection of any contaminant in the effluent by any known analytical technique. These sources may include hydrogen cylinders, hydrogen generators, or in-plant hydrogen. These compact units are placed downstream of the source and source pressure regulator so as to eliminate all components of the source system,