ABSTRACT
Thermistors are recognized as very sensitive temperature sensors. As such, they have found a great deal of use in a wide variety of chemical applications. Any process or chemical reaction that produces or absorbs heat can be detected. It is up to the investigator to properly control physical processes and ingeniously manipulate chemical characteristics of a system under study in order to obtain useful results. Thermal probes are examples of this artful manipulation. Some thermistor probes were designed to mimic potentiometric probes such as the glass electrode. This chapter describes direct probes of this sort. Another set of thermistor probes were developed around flow systems. In this case, the thermistor monitored a specific reaction taking place in a column just before the thermistor. The chapter also summarizes the reported applications of these devices. Each of the many thermistor probe devices has distinct characteristics which make it suitable for use in specific cases.
