Temperature Sensors

There are several scales used in measurement of temperature such as Fahrenheit[F] and Celsius[C] along with Kelvin[K] and Rankine. Below are Conversions:

F-32=1.8C

K=C+273.16

Thermal Resistors-

These are electrically conductive elements that are made to change electrical resistance with changes applied temperature. The sum of resistance is chosen by temperature coefficient of the material which is measured in ohms of resistance change per ohm of resistance per degree Celsius. A positive temperature coefficient device increase resistance with increases in temperature.

Thermistors-

A type of thermal resistor made up of carbon or ceramic like semiconductor formed of oxides of cobalt, manganese, copper, nickel, titanium,

Resistance ratio(rt/ro) is ratio of thermistor resistance at a specified temperature.

Parameters of Thermistors

Maximum Power-

The parameter is max. allowed constant power level that thermistor will hold.

Dissipation Constant-

The ratio of change in power dissipation for small changes in body temperature.

Sensitivity-

Ratio of resistance change to temperature change expresses as a percent change per degree of temperature.