A flame sensor is a vital component in many types of combustion systems, such as gas furnaces, water heaters and boilers. The sensor detects the presence of flames and sends a signal to the control system to activate or deactivate the combustion process. It is essential for any combustion system to have a correctly functioning flame sensor to ensure safe and efficient operation.
In this article, we’ll take a look at how to test a flame sensor. We’ll cover how to identify the type of flame sensor in use, how to visually inspect it for signs of damage or wear, and how to check for electrical continuity. Let’s get started!
The first step in testing a flame sensor is to identify what type of sensor is being used. There are three main types of flame sensors: optical, ultraviolet (UV), and infrared (IR). Each type has its own advantages and disadvantages, so it’s important to identify which one you have before proceeding with the testing process.
Optical sensors are the most common type of flame sensors used in residential applications. They detect light emitted by a flame and send an electrical signal to the control system when it is detected. Optical sensors are reliable and easy to install but can be sensitive to dust and dirt particles in the air.
UV sensors are less common than optical sensors but offer better performance in dusty or dirty environments. They detect ultraviolet radiation emitted by flames and are more reliable than optical sensors in these conditions. However, they can be expensive and require periodic calibration.
IR sensors are the least common type of flame sensor used in residential applications. They detect infrared radiation emitted by flames and are less sensitive to dust and dirt than other types of sensors. However, IR sensors can be more expensive than other types and require periodic calibration as well.
Once you’ve identified what type of flame sensor you have, you’ll want to visually inspect it for signs of damage or wear. Look for any cracks or other damage on the plastic body or wires that could be preventing proper operation. If you see any signs of damage or wear, the sensor should be replaced before proceeding with further testing.
Checking Electrical Continuity
The next step is to check for electrical continuity within the flame sensor circuit using an ohmmeter or multimeter set to measure resistance (Ohms). You’ll need to disconnect all power sources before doing this test. Then, connect one lead from your meter to each terminal on the flame sensor and check that there is continuity between them (i.e., no resistance). If there is resistance present, then the sensor needs to be replaced before proceeding with further testing.
Testing a flame sensor is an important part of ensuring safe and efficient operation for any combustion system. In this article, we’ve gone over how to identify the type of flame sensor in use, how to visually inspect it for signs of damage or wear, and how to check for electrical continuity using an ohmmeter or multimeter set to measure resistance (Ohms). By following these steps, you can be sure that your combustion system will continue operating safely and efficiently!
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