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Why did my perc detector (PD1) take almost 15 minutes to start working. Is that normal?

That would not be a normal warm-up time but it does happen occasionally. This occurrence is called “burning in” the sensor. Generally if it takes more than 1 minute to warm-up it is either the first time the unit has been turned on or it was left in an area with considerable moisture. The reason this happens is because the sensor is hydroscopic or wants water. The sensor is trying to burn out this moisture as it reaches its’ ready state (900 deg. F).