Attached to our older model temp-humidity sensors (TR-3100/TR-3110/TR-3220) are two stickers: a wetness detection sticker and a temperature detection sticker.
Note that only one sticker (a temperature detection sticker) is attached to our newer model temp-humidity sensors (TR-3310/THA-3001/THA-3151/HHA-3151/HHB-3101).
If any of the stickers shows abnormality, you should replace the sensor immediately.
If it is pink it is normal.
If the sensor was used under high temperature conditions the sticker color will change as shown in the picture to the right.
RTR-503/503L, RTR-507/507L, RTR-574/574-H, RTR-576/576-H, RTR-53A, RTR-72, TR-702AW/702AW-H, TR-702NW/702NW-H, TR-72W, TR-72S, TR-72U, TR-72Ui, TR-72nw/72nw-H, TR-72wf/72wf-H, TR-73U, TR-74Ui/74Ui-H, TR-76Ui/76Ui-H, TR-77Ui
December 16, 2016