OPERATING INSTRUCTIONS,
for Testing Oil Burners
OBSERVE THESE SUGGESTIONS
FOR MAXIMUM ACCURACY
(1) Tear strip from perforated Filter Paper sheet (in
SMOKE SCALE envelope); loosen Clamp Screw, insert
end of paper strip in slot (Fig. 1) and tighten Clamp
Screw; release Sampling Tube from rubber barrel Clip.
(2) Insert Sampling Tube at least 2 1/2 inches into
fl
ue
through 9/32 inch diameter hole located between fur-
nace/boiler
fl
ue outlet and draft regulator.
(3) Pull TRUE-SPOT Handle through TEN (10) full
pump strokes (Fig. 2).
(4) Remove Sampling Tube from
fl
ue, loosen Clamp
Screw and remove Filter Paper.
(5) Match color of smoke spot on Filter Paper strip to the clos-
est spot on 10 spot OIL BURNER SMOKE SCALE (RR-
776). In comparing color of smoke spot to chart, slide Filter
Paper strip between back of SMOKE SCALE and white plas-
tic slide, viewing smoke spot on Filter Paper through window
in center of color spots on SMOKE SCALE with smoke spot
backed by white plastic slide (Fig. 3).
(6) Take additional samples required by clamping Filter Paper
strip in slot so previous spot is visible outside the slot.
(a) Although TRUE-SPOT (0021-7012) has been modi-
fi
ed by addition of condensation Trap and Check Valve
Assembly, it is still good practice to warm a cold TRUE-
SPOT to room temperature before testing begins. This
will retard moisture buildup in condensate traps.
(b) About every 10th sample, tap Sampling Tube to
loosen soot or rust, tighten Clamp Screw without Filter
Paper in slot and purge with several rapid pump strokes
(room air).
(c) During sampling be sure to pull piston through 10
full strokes and hold for several seconds at end of each
pull stroke.
On pull stroke, use a steady pull motion such that a full stroke
is obtained in 3 or 4 seconds.
(d) Check TRUE-SPOT occasionally for leakage (SEE MAIN-
TENANCE INSTRUCTIONS).
(e) For maximum accuracy, hold SMOKE SCALE at arm’s
length from eyes when comparing smoke spot on Filter Paper.
(f) Keep SMOKE SCALE clean and store in envelope provided
when not in use.
MAINTENANCE INSTRUCTIONS
General
The design of Model 0021-7012 TRUE-SPOT makes
routine maintenance and replacement of worn or dam-
aged parts a simple matter. Maintenance includes emp-
tying condensate traps if necessary, checking for leak-
age, and periodic cleaning and lubrication. Replacement
parts may be ordered from the Parts List while speci
fi
c
maintenance instructions are discussed in detail in the
following sections.
1. Wetting of Filter Paper
(a) TRUE-SPOT (0021-7012) virtually eliminates Fil-
ter Paper wetting by trapping condensed moisture be-
fore it can contact Filter Paper. A combination trap and
check valve recessed in the pump’s cylinder head retards
condensed moisture on the Cylinder from reaching Fil-
ter Paper on exhaust strokes. The Trap threaded to
1.
2.
4.
3.
MAINTENANCE, cont’d.
the Clamp Screw holds condensed moisture which would nor-
mally wet Filter Paper on intake stroke. When Traps are
fi
lled
with excess condensate as indicated by Filter Paper wetting,
Traps should be removed for cleaning. Remove both Traps
with the wrench provided.
(b) Traps should be shaken and/or blown out. The Valve Disc
may be removed to facilitate this operation when cleaning
Check Valve Assembly. When replacing Valve Disc, make sure
stepped side of Disc faces inward.
(c) All surfaces adjoining Traps and Filter Paper should be
dried with a clean cloth, or reassemble and tighten Clamp
Screw without Filter Paper in slot and pull pump Handle
through 10 or 15 full pump strokes (room air).
2. Leakage
To check TRUE-SPOT for leakage on Pump Cylinder side of
Filter Paper, clamp piece of hard cardboard securely in slot.
Pull Handle out about one inch and release. TRUE-SPOT
Handle should return to approximately original position. Fail-
ure to do so indicates TRUE-SPOT leak caused by rubber Cup
or loose Check Valve Assembly.
3. If TRUE-SPOT Leaks
(a) To examine rubber Cup for damage, turn Cylinder Cap
counterclockwise and pull plunger out of Cylinder. Plunger
should be rotated slowly at end of stroke to prevent possible
damage to rubber Cup due to burrs on Cylinder Cap retainer
slots. If Cup shows suf
fi
cient wear or damage to cause leak-
age, replace as described under PARTS REPLACEMENT.
(b) If Cup shows only slight wear, relubrication as described
in Section 6 will stop leakage.
(c) To examine Rubber Hose connecting pump to metal
Sampling Tube,
fi
rst tighten Clamp Screw securely; then turn
coiled guard Spring clockwise off connection at pump. Replace
defective hose with Bacharach part no. 0021-0071.
4. Parts Replacement
The complete TRUE-SPOT Assembly can be disman-
tled for cleaning or parts replacement with the excep-
tion of the Handle (0021-0033) and Cup (0021-0035). Re-
moval of either of these two parts from the Rod for any
reason except replacement is not advised. Damage to
the rubber parts will occur as a result of forced removal.
If Handle or Cup must be replaced, cut the rubber
part in need of replacement away from Rod. Install re-
placement by pressing tapered end of rod through hole
in rubber piece until retaining shoulder is en-
gaged. MAKE CERTAIN CUP OR HANDLE
IS ORIENTED ON ROD CORRECTLY AND
CYLINDER CAP IS IN PLACE BEFORE FINAL
ASSEMBLY.
5. Cleaning TRUE-SPOT
TRUE-SPOT should always receive a complete
cleaning prior to renewal of lubrication (see Section
6), but individual parts should be cleaned as required.
To thoroughly clean TRUE-SPOT, instrument
should be completely torn down. Do not remove Han-
dle or Cup except under conditions outlined in Section
4. An approved degreasing safety solvent may be used
to clean old lubricant fron Cup and Cylinder bore.
WARNING: Always take precautions and fol-
low manufacturer’s directions when using solvent.
To clean Cylinder, saturate a swab with solvent
and work into bore until free of encrusted lubricant.
Remove Valve Disc (0021-0037) from Check
Valve Assembly. Clean and make certain
ports are clear. When replacing Valve Disc,
make sure stepped side of Disc faces inward.
Condensed
fl
ue gas which has formed a deposit
on the Rod should be removed by scraping or sand-
ing with emery cloth. This will prevent Cylinder Cap
wear which results from Rod working against hole in
Cylinder Cap.
6. Relubricating TRUE-SPOT
Tendency for TRUE-SPOT to “pull hard” at
a sampling speed of 3 to 4 seconds per stroke
with Filter Paper in place is usually due to
lack of lubrication. Clean TRUE-SPOT thor-
oughly as described above before lubricating.
Bacharach Pump Lubricant (0021-0040)
has been selected for superior lubricat-
ing qualities, viscosity, chemical inertness,
and long life. Substitutes are not advised.
Best means of applying is to spread enough lu-
bricant around the outside of the Cup so that when
Cup is wrapped with one layer of muslin cloth, lu-
bricant is squeezed through fabric weave. Any thin,
lint-free fabric including muslin is satisfactory.
Insert lubricated and fabric wrapped Cup
into Cylinder bore and work back and forth un-
til a thin
fi
lm of lubricant remains on the bore. It
will probably be necessary to apply more lubri-
cant to the Cup, rewrap, and repeat the proce-
dure several times before a satisfactory thin, even
fi
lm remains. Do not apply too much lubricant, or
seepage will result when TRUE-SPOT is stored.
After Cylinder bore is lubricated, work lu-
bricant remaining on muslin cloth onto out-
er rim of Cup and reassemble TRUE-SPOT.