Air quality indicator and control for air quality machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 26, 1993
Grant Date -
N/A
app pub date -
Oct 15, 1991
filing date -
Oct 15, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A portable air quality indication unit senses and indicates at least the ambient concentration of aerosols and particulates, the ambient concentration of a gas such as CO, the ambient temperature and the relative humidity, and displays the same. The gas concentration level and particulates concentration level are provided as good or satisfactory, bad or unsatisfactory, or fair/good, i.e., marginal depending on the relation of the detected level to the predetermined threshold level values of gas concentration, and particulates concentration. Temperature and relative humidity can be displayed on liquid crystal displays. A microprocessor circuit within the unit assumes a low-power standby mode, in which the gas and particulates sensor means are sampled at a relatively low rate, when the particulates level and gas concentration level are below their respective TLVs. However, when an abnormal level is detected, the microprocessor circuit assumes a high-sensitivity mode in which the gas sensors are sampled at a relatively high rate.
First Claim
Other Claims data not available