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US4151738A Toxic gas monitor having automatic calibration 失效
有毒气体监测仪具有自动校准功能

Toxic gas monitor having automatic calibration
摘要:
A gas monitor for monitoring the concentration of particular atmospheric constituent includes a sensor and a signal processor that provides concentration-indicating output signals in response to successive samples admitted to the sensor. The processor multiplies the sensor signals by a calibration signal. It automatically recalibrates the monitor by periodically causing a sample having a standard concentration to be admitted to the sensor and adjusting the calibration signal to provide a corresponding predetermined output signal level.
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