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The scanner swivel mount Part No. 60-1664-4 (BSP) 60-1664-3 (NPT) is used to adjust the scanner
sighting angle after the scanner has been installed. The swivel mount is used as indicated the figures in
this document.
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The Orifice restricts the field of view (target area), reduces air flow, maintains air flow, maintain air
block, and increases discrimination between flame and background radiation. The orifice is secured
within the ball of a swivel mount with an orifice retainer or the orifice can be placed within a one inch
union (not provided).
The scanner should ideally sight a target area of 4 to 25 square inches (25-150 cm2) of the flame front.
The flame front is a plane within the combustion space separating the region of unburned fuel from the
burning fuel.
Note: There is an inverse relationship between discrimination and sensitivity.
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The heat insulating nipple Part No. 35-127-3 (BSP); 35-127-1 (NPT) prevents heat transfer from the
hot sight pipe to the scanner head.
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The sealing union (60-1199) is used whenever a union or seal is required for scanner piping. The size is
one inch US standard taper pipe thread (1" NPT). The sealing union has a quartz window to block off
the scanner from the furnace pressure and heat. When the sealing union is used, the 1" tee/wye is used
for the purge air inlet. Be sure the quartz window is properly seated to seal off the scanner. Do not over-
tighten union collar because damage to the window may result. For best results, hand tighten union col-
lar.
FIGURE 6.
1%-28)2%2')
1.
The control and scanner should be powered at all times (except for repair, cleaning or replacement)
to reduce any harmful effects of atmospheric humidity.
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Distributed By: M&M Control Service, INC. 800-876-0036 Sales@mmcontrol.com
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