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首页> 美国政府科技报告 >Capacitance Probe for Measurement of Moisture Content in Open Pore Thermal Insulations
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Capacitance Probe for Measurement of Moisture Content in Open Pore Thermal Insulations

机译：开孔孔隙保温中水分含量测量的电容探针

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Low slope roofs often experience deterioration by moisture condensation and water seepage within the built-up structure. Instrumentation to date for measuring the amount of moisture in roofing has had limited success and has centered on large aerial surveys. This paper documents the design of instrumentation to measure the moisture content by volume of porous building materials. The final configuration includes a fork-like 24 pin capacitance probe and an electronic circuit which outputs a voltage corresponding to the wetness measured. The probe is intrusive yet nondestructive, and gives localized readings which are good for grid surveys. An accompanying electronic circuit allows for real-time capacitance readings with dc voltage output. This instrumentation has been calibrated for board and ceiling fiberglass as well as phenolic insulations. Insertion methods place the probe as deep as six inches into fiberglass with minimal disturbance to the material. Tests within a small-scale roof testing apparatus have shown that moisture movement can be quantitatively followed successfully. The uncertainty of moisture determination is 10%. The method is accurate within the moisture content range of 0 to 30% for fiberglass while a wider, yet undetermined, range exists for phenolic. 17 refs., 33 figs., 1 tab. (ERA citation 14:019742)

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