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Steaming and impregnation- temperature measurement

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 converter which also converts the 4 ... 20 mA signal to a 0 ... 10 VDC signal for the PLC.

Neutralization / inhibitor control - temperature measurement

The slurry from the pre-treatment is neutralized and can also be treated to control inhibitors which can interfere with the fermentation process.
Temperature measurement is done with fast reacting TC-sensors and the PR 5337A HART 5/7 transmitter which provides precise CJC compensation, isolation and conversion to a noise-robust 4 ... 20 mA signal. The 5337 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.

Product tank - level measurement

The ethanol from the distillation process contains about 90% ethanol. The ethanol product is stored in a tank before being shipped from the plant.

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Membrane filter press - signal conversion

The fine particle solid residue is separated from the distillation stillage by filtration and used as fuel for energy production or as substrate for development activities in higher value applications. The process water is sent to the biogas plant at the industrial site. All process water streams from the plant are treated biologically before being discharged.
DP transmitters are used to measure the pressure difference across the membrane filter press, assuring the highest system stability.
Each DP transmitter is energized by the PR 4114 universal transmitter with the PR 4510 display / programming front attached. The 4114 also converts the DP signal to a 0 ... 10 VDC signal.

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Universal Transmitter PR 4116 Input : RTD / TC / Ohm / potentiometer / mA / V Output : current, voltage and 2 relays Accuracy : Better than 0.1% of sel. range Operating temperature : -20°C to +60°C Protection degree : IP20	Programmable LED Indicator PR 5714 Display : 4-digit 14-segment LED Input : mA / V / Ohm / RTD / TC / Potentiometer Output : 2 relays and analog Accuracy : Better than 0.1% of sel. range Operating temperature : -20°C … +60°C Protection degree (mounted in panel) : IP65 / Type 4X	Universal Transmitter PR 4114 Input : RTD / TC / Ohm / potentiometer / mA / V Output : Current / voltage Accuracy : Better than 0.1% of sel. range Operating temperature : -20°C … +60°C Protection degree : IP20
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Yuden-tech is an authorized distributor of PR electronics. With courtesy of PR electronics, this article is reposting from their website. (https://www.prelectronics.com/applications/chemical/)