A stack relay primarily senses which factor rather than another?

A stack relay is designed to monitor and respond primarily to temperature changes rather than other factors. Its main purpose is to ensure that temperature levels remain within safe operating limits, especially in environments where machinery or equipment can be adversely affected by heat.

When temperature thresholds are crossed, the stack relay can activate or deactivate systems such as fans or alarms to manage the environment effectively. In contrast to options that refer to humidity, light, sound, or pressure, the stack relay's function is specifically tied to temperature control, making it essential for maintaining operational integrity and safety in various applications.

This focus on temperature rather than other senses emphasizes the stack relay's role in managing heat-related risks and ensuring the proper functioning of systems that could potentially overheat.