Steaming and impregnation
Steam is used to preheat the cellulose material and remove trapped air. Dilute acid such as sulphuric acid is added.
Precise temperature measurement is needed to ensure the right steam temperature in the process. This is accomplished using a compact high accuracy model PR 5337A hockey-puck style temperature transmitter mounted in a temperature sensor. The 5337A is powered by a PR 4116 universal transmitter which also converts the 4...20 mA signal to a 0...10 VDC signal for the PLC.
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