K60094 Portable Heated Oil Test Centrifuge
Operation and Technical Manual
K60094-Manual
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6-
4. Down Arrow.
Used to decrease the set
point temperature and to decrease or
change parameters when programming
temperature controller.
5. Up Arrow.
Used to increase the set point
temperature and to increase or change
parameters when programming temperature
controller.
6. Output.
Indicates that the heater is “ON”.
WARNING:
The
digital
temperature
controller
for
the
unit
comes
pre-
programmed from the Koehler factory.
Please do NOT attempt to re-program the
digital temperature controller as this will void
the product warranty. If assistance is
required, please do not hesitate to contact
the Koehler technical service department.
Adjusting the Set Point Temperature.
This routine
allows the user to adjust the pre-programmed
set point temperature of the digital temperature
controller.
a. Press
Set
b. Use
UP ARROW
or
DOWN ARROW
to
adjust value of the temperature parameter
to the required value
c. Press
Set
again to store the value, this will
be the new set point.
5 Operation
5.1 Power Connection
Plug the provided line cord into the power receptacle
located at the back of the instrument then connect to
properly fused and grounded receptacle with the
correct voltage as indicated in section 1.3 or on the
back of the unit.
WARNING:
For safety, disconnect the power when
performing any maintenance and/or cleaning.
5.2 Test Procedure
1. Switch both the Pre-heater and Bowl Heater
Power Buttons to the ON position. The
temperature displays will flash on and each
unit will begin to heat to the set test
temperature.
2. With the aid of the two left most non-heated
centrifuge tube holders, fill each of two
centrifuge tubes to exactly the 50-mL
(100-part) mark with the test sample.
3. Fill each tube with solvent to exactly the
100-mL (200-part) mark.
NOTE:
Read the top of the meniscus at
both the 50-mL and 100-mL (100-part and
200-part) marks
NOTE:
If experience indicates that a
demulsifier is required and one has not
already been added to the solvent, add to
each tube quantity of demulsifier solvent
stock solution that has previously been
determined to be satisfactory for the crude
oil under test. Stopper each tube tightly
and invert the tubes a minimum of 10
times to ensure that the oil and solvent are
uniformly mixed.
WARNING:
In
general,
the
vapor
pressures of hydrocarbons at 60°C
(140°F) are approximately double those at
40°C (104°F). Consequently, tubes should
always be inverted at a position below eye
level.
NOTE:
Where the crude oil is very viscous
and mixing of the solvent with the oil is
difficult, the solvent may be added to the
centrifuge tube prior to the oil to facilitate
mixing. In this case, extreme care must be
taken to fill the centrifuge tube to exactly
the 50-mL (100-part) mark with solvent
and then to exactly the 100-mL (200-part)
mark with the sample.
4. Place stoppers loosely on the centrifuge
tubes to prevent pressure buildup during
heating.
5. Place centrifuge tubes into the two right
most preheated centrifuge tube holders
and heat contents of the tubes to 60°C ±
3°C (140°F ± 5°F).
6. Once the sample temperature reaches
and is stabilized at the desired test
temperature, secure the stoppers and
invert the tubes ten (10) times to ensure
uniform mixing of the oil and solvent.
7. Open the lid and load filled tubes into both
tube holders.
WARNING
:
Exercise
caution
when
handling heated samples.
