SIT
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About SIT
SIT is an Italian manufacturer of gas-control components and burner-system parts with a product portfolio spanning pilot lights, thermocouples, gas injectors, solenoid valves, and integrated control blocks. The company has established itself as a supplier of modular gas-safety components used in industrial and commercial burner installations across Europe and globally. SIT components are commonly found in heating systems, cooking appliances, and industrial combustion equipment where repeatable ignition, flame detection, and gas flow regulation are required.
Frequently asked questions
Common questions about SIT from 3G Electric.
What temperature ratings are available in SIT thermocouple assemblies, and how do they differ?
SIT supplies thermocouples in two standard temperature ratings: 850 °C (designation 0200013) and 1000 °C (designation 0200015). Both use 9 mm × 1 mm probe geometry. The 850 °C rating suits ambient-temperature control and standard pilot-light applications, while the 1000 °C rating is specified where higher thermal mass or prolonged high-temperature exposure occurs. Selection depends on the flame-detection environment and burner design thermal profile.
How do SIT gas injectors (such as No. 14 and No. 27) determine gas flow to the pilot light?
SIT injectors are precision orifices that meter gas flow based on their nominal size. Injector No. 14 and No. 27 designations refer to specific orifice diameters, with higher numbers yielding larger flow rates. Pilot-light injector selection depends on the gas type (natural gas or LPG), supply pressure, and required flame size. Correct injector sizing ensures stable ignition and proper flame geometry for reliable flame-detection sensor response.
What is a SIT gas block (such as the Sigma series), and when is it used?
A SIT gas block is an integrated manifold that combines multiple gas-control functions—typically inlet filtering, pressure regulation, solenoid valve switching, and safety interlock logic—into a single assembly. The Sigma series (e.g., part 0845058) reduces installation complexity and space requirements in compact burner housings. Gas blocks are specified when a modular, pre-assembled control module is preferred over individual discrete components.
Are SIT components suitable for both natural gas and LPG applications?
Yes, SIT manufactures components for both fuel types. However, correct specification is critical: natural-gas and LPG systems operate at different pressures and require different injector orifice sizes and solenoid valve settings. Always verify the fuel type and supply pressure when selecting SIT injectors, thermocouples, and control blocks. 3G Electric can advise on fuel-specific part numbers.
What auxiliary components (plugs, contacts, terminals) does SIT supply, and why are they needed?
SIT manufactures threaded plugs (e.g., M10×1), intermediate contacts (M8×1), and electrical terminals to complete control-circuit connections in burner panels. These parts ensure correct electrical continuity between thermocouples, solenoid coils, and safety switches. They are wear items and are often replaced during routine maintenance to prevent intermittent electrical faults.
What does a SIT 5-flame pilot light accomplish, and where is it applied?
A multi-flame pilot (5-flame configuration) distributes ignition points around a larger burner head or furnace firebox, ensuring stable ignition and even flame detection across an extended combustion zone. This design is used in large-capacity industrial burners, oven systems, and furnaces where a single-point pilot would be unreliable. The multiple flame pockets provide redundancy and improve flame-sensor coverage.