One Wire Semiconductor
These types of sensors are our go-to temperature sensors for several reasons. They are one of the most inexpensive temperature sensors on the market and have an excellent accuracy of +/- 0.2°C. They deploy a semiconductor temperature sensor, coupled with on board microchip that not only stores calibration data and its own unique serial number, but also communicates by a single wire, using a serial communication protocol that is easy to read. Having individual serial numbers allows up to 10 sensors to be strung together only requiring one input. Unless you have specific requirements that force you to choose another temperature sensor, we recommend the One Wire. Output is typically a 3.3 - 5V serial communication.
RTD's, PT's, and Thermo Elements
These types of temperature sensors change their resistance when exposed to different temperatures. Their accuracy is among the best but the changes in resistance result in a fraction of a volt making it difficult to measure accurately, specifically with long sensor wire runs or in noisy environments, such as mechanical rooms. Output is typically in millivolts or low volts.
Infrared Temperature Sensor (IR) (Contactless)
This type of temperature sensor is contactless and measures the infrared light emission to calculate the temperature. Their accuracy is excellent but does have interferences to be aware of. It allows easy sensor installation, just point the sensors beam-like window towards the heat source you want to measure. Output is typically a IC2 or some protocol of a serial communication.
Infrared Temperature Sensor (IR) Array (Contactless)
This type of temperature sensor also uses infrared light emission to calculate the temperature. Their accuracy is superior for measuring difficult surfaces. It typically uses 8 x 8 IR sensors and either creates a thermal signature as a crude 64-pixel image or a calculated average temperature across the field. This can be useful in several cases such as measuring the temperature of aerated water, as it combines the temperatures of the infused air with that of the liquid. Again, it allows easy sensor installation, just point the sensors beam-like window towards the heat source you want to measure. Output is typically a IC2 or some protocol of a serial communication.