A UV flame sensor is formed on a multilayer printed circuit board. The circuitry of the sensor includes a photodiode for detecting an input signal, an amplifier for amplifying the input signal, a FET for providing automatic gain control, and at least one capacitor for providing stability to the output signal of the amplifier. The capacitor is formed from a capacitance laminate buried in the PCB. Furthermore, the PCB is designed so that there are guard bands disposed on each layer of the PCB at i...

A flame retardant is provided which has excellent dispersibility in resin ingredients and can give flame-retardant resin moldings excellent in flame retardancy and mechanical properties.The flame retardant comprises magnesium hydroxide particles, a higher fatty acid, preferably stearic acid, bonded to part of the surface of the magnesium hydroxide particles, and a silicone oil having reactivity bonded to that surface part of the magnesium hydroxide particles which does not have the higher fatty ...

A highly efficient flame arrester adapted for use in preventing an external flame from backflashing upstream in a pipe, or a conduit, or a stream carrying a flammable substance. The flame arrester comprises a contained layer of nested ellipsoids formed from expanded metal sheets made from magnesium alloy foil. The arrester is useful in fuel tanks, combustion systems, sea-going tankers, hot water or space heaters, and the like.

A highly efficient flame arrester adapted for use in preventing an external flame from backflashing upstream in a pipe, or a conduit, or a stream carrying a flammable substance. The flame arrester comprises a contained layer of nested ellipsoids formed from expanded metal sheets made from magnesium alloy foil. The arrester is useful in fuel tanks, combustion systems, sea-going tankers, hot water or space heaters, and the like.

A flame detector having the following features is capable of simple and reliable determination of the occurrence or nonoccurrence of fire resulting from a flame based on waveforms detected from detection signals from infrared sensors. The flame detector includes an infrared sensor for detecting an infrared ray, a RAM serving as a waveform storing unit for storing a plurality of waveforms detected from an output signal from the infrared sensor, and a CPU serving as a wavelength determining unit f...

A flame arrestor for a flowing explosive gas (4), having a flame barrier (10, 20, 30) with a large number of defined passage gaps (17, 18), whose gap cross section is set with regard to the properties of the flowing gas (4), is cooled effectively and secured against a flame flashback in the case of continuous combustion by the fact that second gaps (18) having a smaller gap cross section are arranged adjacent to the first gaps (17) having the selected gap cross section.

A flame torch includes a body for receiving a lighter therein, a cap mounted to the body with a frame disposed thereto, a nozzle disposed to a front end of the cap with a pipe assembly connected between the lighter and the nozzle, an ignition device received in the cap and being operated by a button member which is movably disposed to a rear end of the cap, a connecting plate movably connected between the button member and a pushing plate of the lighter. The ignition device has a spark tube exte...

A replica flame (10) for a candle (12) having a wick (14) in a candlestick (16) comprising a simulated three-dimensional flame body (18). A structure (20) is for connecting the simulated three-dimensional flame body (18) to a top end (22) of the candle (12) at the wick (14). It will produce a uniquely realistic appearance for the candle (12) which seems lighted, but is not lighted, thereby making a safe product that will enhance realism to the candle (12).

A flame torch includes a casing in which a reservoir and a starter are respectively disposed, a button member disposed to the casing and receiving the starter therein, the button member having a first shoulder and a second shoulder recessedly defined therein, an extension portion connected to the starter and the reservoir respectively, an L-shaped plate disposed in the casing and having a first end thereof connected to a valve of the reservoir, a second end thereof having an extending plate, a s...

A highly efficient flame arrester adapted for use in preventing an external flame from backflashing upstream in a pipe, or a conduit, or a stream carrying a flammable substance. The flame arrester comprises a contained layer of nested spheroids formed from expanded metal sheets made from magnesium alloy foil. The arrester is useful in fuel tanks, combustion systems, sea-going tankers, hot water or space heaters, and the like.