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■ The UV tube is fragile. Handle carefully and avoid
dropping or sharp blows.
Consult the burner manufacturer's instructions for
mounting location. The scanner should view the
intersection of the pilot and main flames. It typically should
be aimed at the first third of the flame closest to the burner
nozzle, see Figure 2. Certain unburned hydrocarbons, oil
mist, recirculated flue gas or other contaminants may
mask and absorb the ultraviolet radiation.
Position the scanner within 18 inches (457 mm) of the
flame. Longer distances are allowed, but could limit the
field of view and may reduce the turndown or firing range
of the burner.
Mount the scanner to a 1/2" NPT pipe nipple to the burner.
Insure that the scanner body does not exceed 140° F
(60° C) from conducted, radiated, or ambient heat. To
protect from high temperatures, use the insulated coupling
(#49099) with a heat block seal (#400011) and source of
clean purging air (5 CFM typical), or a purge assembly
constructed with a 1/2" WYE fitting.
Keep the scanner lens and line-of-sight free of
contamination. Be aware that scanners looking up are
susceptible to dirt and dust settling. Soot, steam, and
unburned hydrocarbons may reduce or even mask the
radiation from the flame. A purging assembly as described
above may alleviate these problems.
Some burners have an open construction allowing the
scanner to view into a furnace. Avoid sighting background
sources of UV light. If necessary, mask the offending
background source by use of an orifice, the magnifying
lens assembly (#49600-98), or a combination of both to
reduce the field of view.
Test Procedures
Perform the following tests for every new installation and
at periodic maintenance intervals. Depending on the
burner equipment (such as pilot versus direct spark),
some of the tests may not be possible.
Measuring Flame Signal Strength
Insert the positive probe of a 0-15 VDC voltmeter (100k
ohm minimum input impedance) into the test point on the
control cover. Connect the negative probe to the GND or
terminal for the yellow wire. Readings greater than 4 VDC
are adequate.
Minimum Pilot Test
Run this test on pilot ignited burners to ensure that the
sensor will not detect a pilot flame too small to reliably light
the main flame.
Eclipse 90° UV Scanner, V2, Instruction Manual 852, 5/26/2016
CAUTION
44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวี ว ั ฒ นา กทม. 10170.
website:
https://www.add-furnace.com/
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1. Manually shut off the fuel supply to the burner, but not
to the pilot.
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