How to use Thermocouple Transmitters to Monitor Temperatures in Paint Systems – 8400818

This document illustrates using Acromag’s TT330 Series to monitor high temperatures in an automotive paint curing oven and transmit to the existing PLC 4-20mA input card/software setup.

Defining the Problem

The area around an auto manufacturer’s paint curing ovens is at elevated temperatures affecting the performance of locally installed instrumentation. Placing Signal Conditioners rated for high operating temperatures near the ovens allows the PLC controlling the process to be mounted in a lower temperature area. The Signal Conditioner will convert Thermocouples to 4–20mA outputs. Running current loops over long distances instead of Thermocouples reduces costs and minimizes the potential for measurement errors due to electrical noise.

System Requirements

Acromag model TT333-0700 is an Isolated Thermocouple to Current Signal Conditioner with a high operating temperature. It is rated for –40 to 80°C. The TT333-0700 output powers the loop to the PLC. Additionally, the plant can standardize its PLCs with less expensive current input cards over temperature input cards. This makes installations and programming throughout the plant more consistent.

Featured Products

• Loop-powered Isolated Thermocouple Transmitters: TT333-0700
• Programming options: TTC-SIP software kit or the Acromag Agility™ Config App