Popular
online HVAC retailer DtiCorp.com is introducing the brand new Honeywell
S552BE IR Viewing Head. The
Honeywell S55xx product family comprises UV/IR viewing heads intended for flame
scanning applications. These viewing heads must be used with the P52x or P53x
family of signal processors to create a flame scanning system. See chart below
for viewing head part number options, and refer to the respective signal
processor manual for connection, set up and operation.
The S552B/BE viewing head is
designed for IR sensing only. It is basically an S550B/BE without the UV
capability, and a single line display. The S552B/BE display shows the two most
significant digits of the IR pulse count in red, as shown on the connected
signal processor unit. The Signal Processor detects and identifies the viewing
head model to which it is connected, and will only allow adjustments related to
that model to be performed. In the Model S552B/BE, these adjustments are:
a) Filter Selection 1-8
b) IR gain 0-699
The model S55XB and S55XBE series of
viewing heads have in place a sensor for sensing the internal temperature of
the head, which can be displayed on the attached signal processor. For the
P520/P522, press the “Reset” and the “Down” arrow key at the same time. The
temperature reading will be displayed in the four-digit readout. The reading
(indicated in °C) will disappear and the normal reading will continue after
several seconds. For the P532, a dedicated key is provided for each S55XB/BE to
display temperature.
IR Detector:
- The IR
solid state detector in the S550B/BE and S552B/BE viewing heads responds to IR
radiation/flicker in the flame. Flame flicker is caused by the combustion, or
forced air injected into the flame. This combustion air can be mixed with the
fuel (pulverized coal) or can be introduced separately. In either case, forced
air is introduced in such a way as to aid the combustion process. This air is
usually made turbulent by causing it to swirl with spin vanes located in the
burner barrel. Flame flicker is created when turbulent air mixes with the
flame. It is composed of random frequencies and the amount of high frequency
flicker is dependent on the fuel and burner.
- The
S550B/BE and S552B/BE viewing heads respond to flicker frequencies 16 Hz and
above. The lower frequencies are ignored so it is important to sight the
viewing head on the highly turbulent portion of the flame that contains the
higher frequencies. The location of the higher frequencies can be predicted by
examining the burner with regard to where the flame envelope begins and where
the turbulent air enters the flame. The optimum scanner location is parallel to
the burner center line. The use of a swivel mount is encouraged to allow for
line of sight adjustment.
UV Detector:
- - The UV
tube detector in the S550B/BE and S556B/BE viewing heads have a spectral
response of 190-215nm. The output of the detector is a pulse stream of randomly
spaced pulses whose average rate is proportional to the UV radiation present in
the flame.
- The
spectral range of the UV tube makes it ideal for discriminating between flame
and glowing refractory. As with any UV radiation, it can be absorbed or masked
by pulverized coal, unburned fuel, smoke, oil mist, dirt, dust and other
impurities in the fuel. As well, sour gas (H2S) can readily absorb 200nm UV
wavelengths, reducing the amount of ultraviolet radiation reaching the
detector. Care should be taken to select the proper viewing head for the fuel
used. Additionally, the contaminants that mask UV can be diluted by providing a
strong flow of air through the sight pipe to clear a viewing path through the
attenuating material.
- It may
also be desirable to sight the detector at an area containing fewer masking
agents such as near the burner nozzle or near the entrance of the combustion
air. Increasing the viewing area of the detector by shortening the sight pipe
or by increasing the diameter of the sight pipe can also reduce the attenuating
effects of masking agents.
- In
general, the UV viewing heads will work well on natural gas and light oil fuel
flames. The sighting for both oil and gas flames should be parallel to the axis
of the burner and aimed at the root of the flame, as with the IR detector. (See
previous section “IR DETECTOR”.) 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 can be achieved.
About Us: DtiCorp.Com
carries more than 35,000 HVAC products, including
industrial, commercial and residential parts and equipment from Honeywell,
Johnson Contols, Robertshaw, Jandy, Armstrong and more. Our online catalog is easy
to navigate and search, and all products have a picture and a description. If a
customer has any questions about a product, they can call and speak with one of
our product experts. Our mission is to offer the best prices anywhere to our
customers.
More
information about Honeywell S552BE:
