What is the purpose of a gas thermocouple?

The purpose of a gas thermocouple is to provide a safety feature in gas-powered appliances, such as water heaters, furnaces, and gas stoves. Its primary function is to detect the presence of a pilot flame and ensure that the gas valve remains open to supply gas to the appliance.

Here's how it works: The gas thermocouple consists of two different metal wires joined together at one end to form a junction. When the pilot flame is lit, it generates heat that reaches the junction of the thermocouple. This temperature difference between the junction and the other end of the thermocouple creates a small electrical voltage. The generated voltage is directly proportional to the temperature difference.

The gas valve, which controls the flow of gas to the appliance, is connected to the other end of the thermocouple. The electrical voltage produced by the thermocouple is used to keep the gas valve open. As long as the pilot flame is burning and the thermocouple detects the heat, it generates the voltage that holds the gas valve open, allowing gas to flow to the appliance.

However, if the pilot flame goes out due to a draft, malfunction, or any other reason, the thermocouple will no longer sense the heat. As a result, the electrical voltage drops, causing the gas valve to close automatically. This safety feature prevents the uncontrolled release of gas into the appliance and surrounding area, reducing the risk of gas leaks and potential hazards.

SQ-4 Long and Short Pin Horizontal insertion without earth wire universal gas thermocouple

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