Co-Locating Air Sampling Probes and Flow Sensors

J. Glissmeyer (Battelle Northwest)

Air sampling probes and stack flow sensors are often included in the emission stacks at nuclear facilities. Makers of stand-alone flow sensors require that their sensor be located considerable distance upstream and downstream of flow disturbances, including air sampling probes. The data show; however, that both air sampling probes and flow sensors can be located in the same cross section of a stack or duct. Some vendors of commercial integrated probe-sensor assemblies have been doing this for years. A separation of as little as 2 inches between the air sampler nozzle body and the flow sensor ensures satisfactory performance of both the air sampling probe and the flow sensor.

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