The IRIS Model S506 is a UV (ultraviolet) Viewing Head that responds to the
very short wavelength radiation emitted by flames. This is the radiation
caused by the combustion process, that is, oxygen combining with hydrocarbons,
not radiant energy caused by the heat of flame. The S506 has a peak response
of 200 nm (nanometers) and covers a very narrow spectral range, 185-206 nm.
This narrow range is very selective in detecting flames and discriminating
from glowing background.The S506 uses a specially designed UV tube that has excellent quenching
characteristics and, with the unique electronics circuitry used in the S506,
results in a wide linear range. This characteristic is extremely important for
being able to discriminate between burners in difficult application such as
low Nox gas burners.
In general, the S506 will work very well on natural gas flames. It will
respond to oil flame but with a lower signal level. The sighting should be
parallel to the axis of the burner and aimed at the root of the flame.
Photographs of gas and oil flames using visual and UV-sensitive film show
clearly that the UV zone is much smaller than the visible zone, and the
highest UV intensity occurs near the root of the flame. In addition, the zone
of higher UV intensity does not overlap the same zones of adjacent or opposing
burners so that, with proper sighting, discrimination is predictable.
The S506 employs self-checking which is implemented by using a shutter that
blocks the flame light path every second for 200 milliseconds. Each time the
shutter closes the flame signal drops out resulting in a chopped flame signal.
This chopped flame signal is fed to unique patented circuitry in a signal
processor which monitors this (chopped) signal in a fail-safe manner.
Please call or email for pricing and availability at 281-42-1321 or [email protected].
