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I have a customer making liquid food products (sauces, etc), in a steam jacketed kettle. They're measuring temp with a 3-wire RTD, mounted in a flush mount sensor similar to Pyormation's TTA. The sensor is installed near the bottom of the tank, in the steam jacketed area. The top 2 feet or so of the tank are not steam jacketed.
http://www.pyromation.com/Catalog/fd11.pdf
The RTD signal goes to a Prosense XTD transmitter, and the 4-20 signal is looped to a PLC, chart recorder, and panel meter. All of those readings are the same value.
They sometimes have an issue where the value from the transmitter is about 50 deg F higher than the temperature measured by sticking a mechanical thermometer into the top 6 inches or so of the product.
We're not sure if it's an issue with the electronics, or simply a matter of a temperature gradient within the tank.
Any suggestions on ways to narrow down the issue?
http://www.pyromation.com/Catalog/fd11.pdf
The RTD signal goes to a Prosense XTD transmitter, and the 4-20 signal is looped to a PLC, chart recorder, and panel meter. All of those readings are the same value.
They sometimes have an issue where the value from the transmitter is about 50 deg F higher than the temperature measured by sticking a mechanical thermometer into the top 6 inches or so of the product.
We're not sure if it's an issue with the electronics, or simply a matter of a temperature gradient within the tank.
Any suggestions on ways to narrow down the issue?