A water temperature switch is a type of ______ device used to alert us to an abnormal condition.

A water temperature switch is a type of ______ device used to alert us to an abnormal condition.

• A. Alarm
• B. Communication
• C. Supervisory
• D. Control

Answer: (C)

A water temperature switch is best described as a supervisory device because its job is to monitor a condition and provide a status signal indicating that something is outside normal limits. It doesn’t automatically change the process by itself (that would be the role of a control device), nor is it simply an alarm that sounds or displays a warning independent of the system. Instead, it supervision the condition and feeds information to the control system or operator so the appropriate action can be taken. If it were used to directly trip equipment to stop the process, it would be a control device; if its primary purpose were just to emit an audible/visual warning, it would be an alarm.

A water temperature switch is best described as a supervisory device because its job is to monitor a condition and provide a status signal indicating that something is outside normal limits. It doesn’t automatically change the process by itself (that would be the role of a control device), nor is it simply an alarm that sounds or displays a warning independent of the system. Instead, it supervision the condition and feeds information to the control system or operator so the appropriate action can be taken. If it were used to directly trip equipment to stop the process, it would be a control device; if its primary purpose were just to emit an audible/visual warning, it would be an alarm.