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Chessell 392

Our chart recorder is used to measure 3 pieces of equipment. For two of the three it works fine. On one particular piece of equipment the recorder shows an hour or two drop in temperature (approx. 5-10deg C) on the chart about once per week. This has been happening for a while now (~6 months). We have placed another recorder inside the unit which never shows a deviation from the set point and we have placed thermocouples in the unit and also did not see the drop in temperature as the chart recorder showed. A calibration technician rewired that particular pen but it did not change anything.

Do you have any suggestions?
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