Temp, measure/determine.

Temperature, measure and determine it in kiln.

In most cases, the temperature sensor and indicator is called the "dry bulb".

Kiln temperature is measured using a standard RTD sensor(resistance temperature detection, also call PT100 in europe). This method of determining temperature is so popular that it has almost become an industry standard. For short distances between the dry bulb and control panel, a two wire version can be used. For longer distances between the dry bulb and control panel, the three or four wire is preferred (as the controller compensates for the resistance in the longer wire). In some cases, the signal is converted to either voltage or mA signal. For example, the 4-20mA current-loop is a signal type which can both power the transmitter and provide a nearly interference free signal.

In most standard kilns, two dry bulbs are used(one in the front and one in the back). By having two dry bulbs, the controller can read the entering air temperature and thereby provide a more accurate temperature control. In some cases, a relay is tied into the forward and reverse fan cycle. Dependent upon fan direction, the relay sends one of the dry bulb signals to the controller. Though uncommon, a technique sometimes used is that of reading both dry bulb signals into the controller. Practically speaking, there is no real benefit of such a network unless one sensor were to fail. Were a sensor to fail, the second sensor would simply keep operating. If a two sensor relay system looses one sensor, the controller would simply disregard the reading and not try to adjust the temperature.

If a chart recorder of a similar method of constant recording is used, you will often be able to determine the problem, just by analyzing the chart.