In recent years, portable gas detectors have shrunk in size and cost while many new features have been added: automatic time-weighted average (TWA) and short-term exposure limit (STEL) calculations, data logging, man-down alarm, and wireless capabilities to name a few.
When monitoring in a duct for gas hazards, several factors should be considered, including the sampling conditions, gas characteristics and flow dimensions, in order to obtain a meaningful gas measurement. You must ensure, of course, that the sensor is not installed in conditions that will damage or hinder the sensorâ€™s capability to detect gas. This article will weigh the merits of in-situ (localized) sampling in the duct versus pumped sampling based upon sample conditions.
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