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Span PacT 61-W-H2O and 261-W-H2O (Welded Instruments)

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The welded (W) single-oven instrument is used where the minimum concentration required is below 0.1 ppm (100 ppb). These systems are used for concentrations down to about 10 ppb in inert background gases. (The minimum concentration is actually set by the minimum practical permeation rate.) They feature all electropolished 361L seamless stainless steel tubing, orbitally-welded joints, VCR® connections at service access points and special components for high purity service.