Which item is not a sensor used by the detectors?

Which item is not a sensor used by the detectors?

• A. PID
• B. Hydrogen Cyanide (HCN) sensor
• C. Oxygen sensor
• D. Battery indicator LED

Answer: (D)

Sensors are devices that actively detect environmental conditions or hazards and convert that information into a signal. In this context, a PID detects a broad range of volatile organic compounds using UV ionization, an HCN sensor is designed to specifically respond to hydrogen cyanide, and an oxygen sensor measures the level of oxygen in the environment. The battery indicator LED, however, is just a status display showing the device’s power level. It doesn’t measure any gas or environmental parameter, so it isn’t a sensor.

Sensors are devices that actively detect environmental conditions or hazards and convert that information into a signal. In this context, a PID detects a broad range of volatile organic compounds using UV ionization, an HCN sensor is designed to specifically respond to hydrogen cyanide, and an oxygen sensor measures the level of oxygen in the environment. The battery indicator LED, however, is just a status display showing the device’s power level. It doesn’t measure any gas or environmental parameter, so it isn’t a sensor.