SEDL / STP / STP1000-EB / STP39194S

A Study of Large Sets of ASTM G 84 Time-of-Wetness Sensors

Heckher, JJ
Institut de Génie des Matériaux, Boucherville, Quebec

Boulanger, J
Institut de Génie des Matériaux, Boucherville, Quebec

Noël, D
Institut de Génie des Matériaux, Boucherville, Quebec

Dufresne, R
Université de Montréal, Montreal, Quebec

Pinon, C
Université de Montréal, Montreal, Quebec

Pages: 19    Published: Jan 1990

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Abstract

Three sets of 32 to 39 ASTM time-of-wetness G 84-84 sensors were exposed during summer and winter in Montreal. For the summer periods, all sensors responded well to rain but had a very different sensitivity to dew, with some sensors never responding to dew. For the winter period all sensors responded well to condensation below the freezing point. The ASTM sensor selection criteria are sound for atmospheres having a small dew time-of-wetness compared to the rain time-of-wetness. For atmospheres having a large dew time-of-wetness, the sensors should be tested in order to discard those which are not very sensitive to the dew. A sensitivity factor for each sensor within a given set can be determined experimentally in order to increase the precision of the time-of-wetness values.