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| |  The Welker Stack Sampler (patent pending) is a true event sampler in that it operates only when the stack is actuated. Normally installed on emission lines to the stack, the sampler uses a flow generator to create a continuous flow in the system and takes composite samples with the patented Vanishing Chamber® head collection method. It samples a full range of products and common pollutants not obtainable from other comparably priced devices. The Stack Sampler can operate under vacuum (with auxiliary supply) or atmospheric pressure. It can sample timed, proportional to flow or on command. | |
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