What type of sensor measures the temperature of flue gases exiting the boiler?

• A. Water Level Sensor
• B. Flue Gas Temperature Sensor
• C. Pressure Sensor
• D. Flow Rate Sensor

Answer: (B)

A flue gas temperature sensor is specifically designed to measure the temperature of the gases that exit the boiler. This measurement is crucial for a number of reasons. First, it helps ensure that the combustion process is operating efficiently. By monitoring the flue gas temperature, operators can identify potential issues such as incomplete combustion, which can lead to increased emissions and reduced efficiency.

Additionally, the temperature of the flue gases provides important information about the overall health and performance of the boiler. Excessively high temperatures can indicate problems such as burner issues or excessive fuel consumption, while low temperatures may suggest that the boiler is not operating at its optimal performance level. These sensors typically use thermocouples or thermistors that can withstand the harsh conditions of the flue gas environment.

In contrast, other types of sensors such as water level sensors, pressure sensors, and flow rate sensors serve different purposes within the boiler system. Water level sensors monitor the water level in the boiler, which is critical for safe operation but unrelated to flue gas measurements. Pressure sensors are used to monitor pressures within the system, while flow rate sensors measure the flow of water or steam but do not provide any data related to flue gases.