Termopara typu Master 4150.674

Master 4150.674 termocouple, catalogue article 696.799.009, manufacturer codes 4150.674 and 696.799.009. Brand: Master. Category: Air heaters components. A thermocouple of this type is a flame-sensing safety device used in gas-fired appliances that have a pilot burner. It generates a small millivoltage when heated by the pilot flame; that voltage holds the gas valve open. If the pilot goes out, the voltage drops and the valve closes, stopping gas flow. This part sits between the pilot burner and the gas valve, typically connected by a threaded nut at the valve end and a probe that enters the pilot flame. When selecting a replacement thermocouple, the key parameters are the probe length and the connection thread (usually 1/4" or 3/8" BSP). The output voltage is not normally specified because it is a characteristic of the thermocouple type; most pilot safety circuits are designed for a standard thermocouple output. The overall length must match the distance from the pilot burner to the gas valve. Ensure the thermocouple is intended for the fuel gas in use – natural gas or LPG – although generic types often work for both. When replacing, check that the probe tip sits correctly in the pilot flame and that the nut seals tightly. Also verify that the valve’s pilot safety circuit is in good condition; a faulty valve can cause a thermocouple to fail prematurely. Always reference the original part number or measure the existing unit to confirm fit.