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Old December 20th, 2017, 12:25 AM   #1
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sparkie is offline
Join Date: Nov 2014
Location: KS
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Temperature Controls in a Glycol Chilling System

I'm starting on the controls of a set of glycol cooling vats this week. Something the customer wants is a centralized HMI to control and monitor all the vats, but he also wants to be able to set the temperature at the each vat. Each vat also has a roughly foot and a half deep threaded thermal well for a temperature sensor. My questions are two-fold.

I'm thinking of using a Type J RTD to monitor temperature. Is there any reason these will not work for this type of application?

I'm running into an issue with changing the temperature at the vats and at the HMI. I have to parallel them so that neither takes precedence in sending the data to the PLC. I was thinking of using a temperature controller to read the RTD and send a 4-20mA back out to the PLC, but the issue still remains with viewing and changing the setpoint from each individual station. Any suggestions on this?
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