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INSTALLATIONS
Moisture Monitoring Leak Location System for 25,000 SQF of Glass Curtain Wall
Erie Insurance Building, Erie, Pennsylvania 

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The unfinished structure, showing where the MSLL sensors would be placed between the curtain wall aluminum transom and the EPDM roofing membrane. The North side and West side curtain wall systems were monitored using this approach.
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Generation 1.0 wireless MSLL sensor tag:
  • 4"L x 0.75"W x 0.008"H (8 mils thickness)
  • Flexible plastic film
  • Senses water in close proximity
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Wireless MSLL sensor mounted on a specially designed moisture-wicking device
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 Wireless MSLL sensor assembly installed at base of curtain wall below base aluminum transom
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Wireless MSLL sensors monitor the internal water drainage of a dry glazing curtain wall installation
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View along one section of  monitored curtain wall as MSLL system is installed and calibrated
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View along the same section now finished. The wireless sensors are surveyed to detect water infiltration. Results are uploaded to a database.
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A moisture survey performed on the installed MSLL probes in Zones 1, 2 and 3. Each data point in the chart above represents the average of 50 individual readings:
  • The change in moisture readings between the survey and dry installation baseline was normalized to the dry baseline Upper Control Limit (UCL)
  • Probe locations 6 and 9 have moisture readings above the UCL and indicate a very high probability (> 0.997) of moisture infiltration
  • Probe location 1 has a moisture reading just below the UCL
  • Probe locations 2, 4, 5, and 10 to 13 have moisture readings above the dry installation baseline
Note that the area in the chart between the installation dry baseline (0.0) and the UCL (1.0) represents the measurement uncertainty of the installed MSLL sensors. In this case, the UCL represents approximately 5% of the sensor's full-scale reading. Each installation baseline is calibrated in the dry (moisture-free condition). Any reading in a following survey that rises above the UCL indicates a very high probability that moisture has been detected by a sensor.

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