Moisture Sensor Technology: A Summary of Techniques for Measuring Moisture Levels in Building Envelopes.
Moisture Sensor Technology: A Summary of Techniques for
Measuring Moisture Levels in Building Envelopes.
Healy, W. M.
ASHRAE transactions, Vol. 109, No. 1, 232-242, February
building envelopes; moisture; sensors; instrumentation;
As moisture-related problems increase in homes, the need
for sensors to accurately measure the moisture level in
the building envelope grows. Sensors are needed to
assist in model verification, to indicate the
effectiveness of moisture abatement steps, and to warn
of potential moisture intrusion. The most popular
sensors currently used by building scientists are those
based on electrical resistance, but a great deal of
dissatisfaction exists with this technique. Installation
of these sensors is difficult, drift in the response
causes transient changes in the measurements, and
calibration has proven to be a challenge. Numerous
techniques promise better accuracy and easier use than
the electric resistance probes, but work is needed to
produce a sensor small enough to fit unobtrusively in a
wall cavity. This work has identified many existing
techniques for measuring moisture and presents
advantages and disadvantages of each.