Thermocouple Transmitters Monitor Temperatures in Paint Systems

Defining the Problem: 

A manufacturer’s paint curing ovens are located far away from the PLCs controlling the process. The ambient temperature around these ovens exceeds the performance ratings of the existing instrumentation.

Implementing the Solution:

1. Run a short amount of thermocouple wiring away from the direct heat of the ovens.
2. Install isolated Acromag thermocouple-to-current transmitters that re-use the existing PLC 4-20mA input cards.
3. Run 4-20mA copper wiring the rest of the distance, from the transmitters to the PLC panels.
4. Wire the transmitters’ 4-20mA outputs for either DC or looppowered PLC input connections. Acromag’s TT230 Series supports sourcing (3-wire) and sinking (2-wire) output.

Featured Products: 

• 2-Wire Thermocouple Transmitters
• TT233-0600 Software Interface Package TTC-SIP All trademarks are property of their respective owners. 

System Requirements:

Keep the existing PLC 4-20mA input cards and ladder logic programs to maintain process standards and avoid purchasing expensive thermocouple input cards or re-programming of the PLC

Why Acromag:

Our TT series offered an affordable solution with a higher operating temperature range (-40 to 80°C). The transmitters helped save on costs by using 4-20mA copper wire, which is less expensive than thermocouple wire. Most important, the manufacturer kept their PLC 4-20mAinput cards and software setup unchanged.