D7261_13
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Select Mode D, Mark 5 deluxe,
or Diesel, Mark 10 operation.
Depress pushbutton D, or
Diesel, for Mode D operation.
Sequential illumination of
the pushbuttons will cease,
and the depressed
pushbutton will stay lit.
The correct syringe drive
speed is set automatically.
To remove any contaminants from
the syringe barrel and stirrer,
run two 50-milliliter
portions of the fuel
to be tested through the mixing
system in clean cycles as
follows.
Remove the plunger from a
new 50-milliliter syringe
and wipe the tip using
a clean, lintless
wipe to remove any sheen
caused by excess lubricant.
Insert a plug into the exit
hole of the syringe barrel
at 50 milliliters plus or
minus 1 milliliter of fuel
and place the syringe barrel
on the emulsifier mount,
turning to lock in place.
To mitigate the buildup
of static charge,
only nitrile gloves
are recommended for use
while handling the
syringe barrel.
Ensure that the syringe
barrel is properly
aligned concentrically
with the mixer shaft
and is not touching
the propeller.
Proper alignment can be verified
by grasping the syringe barrel
and moving the same
until the propeller
on the end of the mixing shaft
is free and not touching.
Misalignment can
cause plastic shavings
to form and collect
on a coalescer filter,
resulting in erroneous
test results.
This applies to all
instruments manufactured
prior to July 1988
that have not been
serviced by MC Electronics,
Incorporated, since that date.
Since July 1988,
with ASTM approval,
all new instruments and
those returned for service
have had a standoff
installed on the mixer shaft
to prevent the syringe barrel
from coming into contact
with the mixer blades.
Initiate the clean cycle by
depressing the Start pushbutton
on the Mark 5 or the
Clean 1 pushbutton
on the Mark 10, as designated
by the annunciator light.
Warning-- do not
operate the mixer
without having a syringe
with fuel in place.
The mixer bearings depend
on the fuel for lubrication.
At the end of the
first clean cycle,
when the mixer motor stops,
remove the syringe barrel
from the emulsifier,
discard the fuel,
and drain the
syringe thoroughly.
Add 50 milliliters plus or
minus 1 milliliter of fuel
into the syringe and
place the syringe barrel
on the emulsifier mount.
Turn to lock in place.
Visually inspect that the
syringe barrel is properly
aligned concentrically
with the mixer shaft
and is not touching
the propeller.
Add about 15 milliliters to
20 milliliters of the fuel
to be tested into a new vial.
Wipe the outside of the vial
with a clean, lintless wiper
and insert the vial into
the turbidimeter well,
aligning the black
mark on the vial at 90
degrees from the white line on
the front of the turbidimeter
well.
Rotate the vial until the
black mark on the vial
aligns with the white line on
the front of the turbidimeter
well.
See figure 1 of the
written standard.
This vial of clean
fuel is required
for setting the meter reading
to 100 in 13.8 of the written
standard.
Initiate the second
clean cycle on the Mark 5
by pressing the Reset and
Start pushbuttons sequentially.
Initiate the second clean
cycle on the Mark 10
by pressing the Clean 2
pushbutton as designated
by the annunciator light.
At the end of the
second clean cycle,
when the mixer motor stops,
remove the syringe barrel
from the emulsifier,
discard the fuel,
and drain the
syringe thoroughly.
Add 50 milliliters plus or
minus 1 milliliter of fresh fuel
sample into the syringe.
Handle the syringe
in such a manner as
to minimize warming of the
fuel sample by body heat.
Using a fresh plastic
tip on the hand
pipette, add 50 microliters
of double-distilled water,
8.7 of the written standard,
to the fuel sample as follows.
Holding the pipette in
hand, give a slight twist
to the plastic tip to
ensure a tight seal.
Push in the plunger.
Immerse the tip just
below the water surface.
Release the plunger and
withdraw from the water
slowly to avoid
water drops adhering
to the outside of the tip.
Immerse the tip of the pipette
just below the fuel surface
in the center of the
syringe, figure 5
of the written standard.
To ensure the water
drops break away cleanly
and fall to the bottom, push
and hold in the plunger,
withdraw the pipette,
and release the plunger.
Place the syringe barrel
on the emulsifier mount,
turning to lock in place.
With the syringe in place,
initiate the automatic portion
of Test Mode D on the Mark 5 by
pressing the Start pushbutton,
figure 6 of the
written standard,
or the run switch,
figure 2 of the written
standard on the Mark 10.
If, for any reason, it
is desired to interrupt
the sequence and start
over, the Reset pushbutton
will cancel the test in
progress and reset the program
to the beginning of the clean
segment of the test cycle.
The automatic program
for the Mark 5
starts with a read
meter indication--
four short tones followed by a
10-second full-scale adjustment
period.
During this period, depress the
illuminated arrow pushbuttons
on the Mark 5 to adjust
the meter to read 100,
figure 7 of the
written standard.
The 100 reading is
automatically set on the Mark 10
and does not require
any adjustment.
After the full-scale
adjustment period,
the mixer motor activates,
and the emulsion process
is initiated.
If the Mark 5 meter adjustment
cannot be completed at this
time, final adjustment may be
accomplished during the second
meter adjust period, occurring
later in the test sequence.
A few drops of fuel can seep
from the hole in the emulsifier
head during a high-speed
mixing operation.
This should not affect
the test results.
If the emulsifier
speed of the Mark 10
is outside of acceptable limits,
the error alert indicator
on the Mark 10 will illuminate,
and ERR-05 will be displayed.
The Mark 5 does not
have an error alert.
When the mixer stops
after emulsification,
remove the syringe barrel
from the emulsifier
and partially insert
the plunger to seal
the open end of the syringe.
Invert the syringe, exit
hole up, remove the plug,
and exhaust the entrapped
air in the syringe barrel
without significant fuel loss
by carefully inserting plunger
to a 50-milliliter mark.
Use a clean wipe
over the exit hole
to capture the small
amounts of fuel
which may be extruded as foam.
Affix a new coalescer, 8.3.4
of the written standard,
to the end of the
syringe barrel.
Warning-- use of an
incorrect coalescer,
such as a jet fuel coalescer,
will give erroneous results.
Place the entire
syringe assembly
into the syringe
drive mechanism,
figure 8 of the
written standard.
To minimize the effect of
plunger resistance-- drag--
in the syringe barrel, align
the syringe assembly vertically
in the syringe drive mechanism
with the end of the syringe
plunger parallel with push bar
of the syringe drive mechanism.
Position a waste container
beneath the coalescer
to collect the unwanted portion
of the processed fuel sample
during the coalescing period.
Electrically bond the coalescer
to the micro-separometer
to prevent buildup of an
electrostatic charge that
could result in ignition
of flammable test fluids.
Fasten the alligator
clip to the coalescer
and insert the plug in
the chassis ground jack,
figure 8 of the
written standard.
Other suitable
grounding methods may
be used for previous models.
Each micro-separometer
instrument
is furnished with
a ground lead that
has an alligator clip on one end
and a banana plug on the other.
The second meter adjust
period for the Mark 5
will occur after
four short tones.
Adjust the meter reading
to 100 if necessary.
The Mark 10 does not
require any adjustment.
The syringe drive
mechanism will start down
at the end of the meter adjust
period, forcing the water
and fuel emulsion
through the coalescer,
figure 8 of the
written standard.
During this operation, remove
the vial from the turbidimeter
well and discard the fuel.
Collect the last 15 milliliters
of fuel sample being processed
from the coalescer, figure 9
of the written standard, when
the collect sample annunciator
lamp, marked C and S,
illuminates and a pulse tone
of short duration sounds.
To lessen the amount of air
introduced into the fuel
during this operation, position
the vial at a slight angle
and allow the fuel to flow
down the inner surface.
Remove the vial just prior to
when the last amount of sample
is expelled from the coalescer.
Wipe the outside of the vial
with a clean, lintless wiper
to remove any
fingerprints and fuel.
Place the sample vial into
the turbidimeter well.
Align the marks on the vial
and on the control panel
in front of the well.
At the end of the
settling time, one minute,
a steady, four-second
duration tone
will alert the operator that
the meter is about to activate.
At the end of the
tone, the meter
will automatically activate
for approximately 10 seconds.
Read the DSEP rating,
displayed as a whole number,
at the midpoint of the
10-second meter read cycle,
indicated by a short,
one-second tone.
Numerical values obtained
outside the measurement range
from 50 to 100 are
undefined and invalid.
See 5.2 and note 2 of
the written standard.