An open loop sensor is a type of sensor that does not rely on feedback from the system being monitored to function properly. Instead, the sensor produces an output based on the input it receives and does not take into account any changes in the system being monitored.

Open loop sensors are typically used in simple control systems where the relationship between the input and output is well understood and does not vary significantly over time. They are generally less expensive and simpler to implement than closed loop sensors, which do rely on feedback from the system being monitored.

Examples of open loop sensors include temperature sensors, pressure sensors, and flow sensors. These sensors produce an output that is directly related to the input they receive, and do not take into account any changes in the system being monitored.