Name list of products gas appliance thermocouples gas heaters

Description:

A thermocouple is a very small thermal generator, which consists of two dissimilar metals fused together at what is known as a cold junction. Focused pilot flames heat the thermocouple and produce the needed voltage for the pilot plunger in the valve to stay open. If the pilot flame goes out for any reason, the pilot plunger will snap closed and gas will cease to flow.
 
Thermopile - An often accompanying term when speaking of thermocouples, a thermopile is nothing more than a series of thermocouples that are tightly bundled within a larger probe.  Gas appliances that require a larger amount of millivoltage to power the gas valve or other peripherals may use these higher output devices.

 Thermocouples and thermopiles are usually used in conjunction with one another and arranged radially around a central pilot hood.  Gas is fed into the central pilot and then diverted toward the adjacent thermocouples and thermopiles. While the power created is higher (up to 750mV for thermopiles), the purpose is generally the same, with the voltage being used to power electromagnets within the valve.

Thermocouple is a part that is working from thermo energy converse into electrical energy. It mainly functions as a provider of continuous electrical energy for magnet. It will stop providing electrical energy for magnet when the flame is put out by external factors, then the magnet acts so that the gas valve is closed, which prevent the danger from gas leakage.

The flame sensors are one of the following types:
1. Thermocouple: A device made of two different metals which creates a small electrical charge when heated at one end.
2. Thermopile: A probe that contains multiple thermocouples, therefore it can produce a larger electrical current.
3. Electrode sensor: The rod places the same role as thermocouple

Note: many pilot assemblies look different but all function in the same way. 

What's ODS?

ODS is designed based on pilot burner with an extra function.
Oxygen depletion sensors (ODS) are commonly found on heaters and fireplaces. The sensor is designed to shut off the gas if the oxygen level in the room drops from 21% (normal air) to 18.5% oxygen by volume or below.

Technical Characteristics

1. Type of connection to magnet unit: Nut, Coaxial, Faston

2. Lengths: 170-1850mm

3. Maximum temperature (head): Depending on the head type, up to 700°C maximum.

4. E.M.F. in open circult: ≥30mV(Normal) ≥16mv(Fast action)

5. Inner resistance: 8.5+0.22*L(mΩ)

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