Wahl Temp-Plates have heat-sensitive indicator positions that turn permanently black when the rated temperature point is reached.

When connected to the process control loop, this temperature-sensing device can provide accurate, stable and repeatable data to the process controller. That is, until something goes wrong. Then what happens?

Successful control of your cooling process and selection of a suitable control require a good understanding of the flow of heat in that process. No matter how intelligent or elaborate a control is, it cannot overcome the limits of basic thermodynamics in a system or process.

In this issue of Process Heating, we have two articles to help you optimize boiler maintenance and — in the event of idled equipment — boiler layup, as well as advice about temperature sensors for fired heaters and heat exchangers for food-grade applications.