There is a mention of roofing materials among the description of applications for Moisture sensors, and also a rather unclear answer to the length of time these sensors last as it were. If these moisture sensors were placed under roofing materials, to detect moisture intrusion on say an annual basis as a preventative maintenance measure, how many years could such a sensor last on a roof? 5, 10, 15, 20+ years, or its unknown because no one has had one up on a roof that long?
Also, could such a sensor be read through a thick layer of materials, like stucco lath or a deck coating on other parts of buildings; again for the purpose of water intrusion detection?
Do they need to be “wet” to report as such, or is near proximity to say being on a wet board enough to detect moisture?
1. Regarding sensor lifespan, RFMicron sensors do not use batteries and are only powered when the sensor is read, which means that for most of the time, the sensor is in an inactive state. Furthermore, the materials used to construct our sensors are highly stable and nearly impervious to corrosion. We also subject our sensor designs to accelerated aging and stress testing during qualification. As such, we believe the operational lifespan of our sensors is at least 15 years.
2. In terms of reading through a thick layer of building materials, RFMicron sensors can be read through most building materials, including stucco and deck coating. However, if the sensor is integrated with a full-metal roof and the sensor is within several millimeters of the metal, then the roof may shield or interfere with the sensor antenna. In these cases, the sensor would need to be separated from the metal roof by several centimeters.
3. The RFMicron sensor does not need to be “wet” to detect moisture. Our sensors have been used to determine moisture content of various wood products by being placed in proximity to the wood.
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Axzon (formerly RFMicron)
3700 N. Capital of Texas Hwy
Austin, TX 78746
Tel: (512) 535-4647 Axzon.com