Koehler K3919 Series Guide

Operation and Instruction Manual
REV B
Koehler Instrument Company, Inc.
1595 Sycamore Avenue • Bohemia, New York 11716-1796 • USA
Toll Free: 1-800-878-9070 (US only) • Tel: [phone] • Fax: [phone]
http://www.koehlerinstrument.com • e-mail: [e-mail]
Petroleum Testing & Analysis Instrumentation • Custom Design & Manufacturing
K3919X
Demulsibility Bath

K3919X Demulsibility Characteristics Bath
Operation and Instruction Manual
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K3919X Demulsibility Characteristics Bath
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CERTIFICATE OF CONFORMANCE
Demulsibility Bath
K3919X
This certificate verifies that part number K3919X, Demulsibility Bath, was
manufactured in conformance with the applicable standards set forth in this
certification.
Specifications: ASTM D2711
This unit is tested before it leaves the factory, to ensure total functionality and
compliance to the above specifications and ASTM standards. Test and inspection
records are on file for verification.
Jesse Kelly
Application Engineer
Koehler Instrument Company

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Table of Contents
1Introduction..................................................................................................................6
1.1 Koehler’s Commitment to Our Customers .........................................................................................6
1.2 Recommended Resources and Publications.....................................................................................6
1.3 Instrument Specifications...................................................................................................................6
2Safety Information and Warnings...............................................................................6
3Getting Started.............................................................................................................7
3.1 Packing List........................................................................................................................................7
3.2 Unpacking..........................................................................................................................................7
3.3 Setup..................................................................................................................................................7
4Descriptions.................................................................................................................8
4.1 Instrument Controls............................................................................................................................8
4.2 Accessories for Running Tests..........................................................................................................8
4.3 Temperature Controller Operation.....................................................................................................9
5Operation....................................................................................................................10
5.1 Bath..................................................................................................................................................10
5.2 Power...............................................................................................................................................10
5.3 Install the K39103 Demulsibility Stirrer............................................................................................11
5.4 Operation Procedure........................................................................................................................11
5.5 Cleaning the Stirrer..........................................................................................................................11
6Safety Features..........................................................................................................11
6.1 Over-Temperature Protection..........................................................................................................11
6.2 Over-Power Protection.....................................................................................................................11
7Maintenance...............................................................................................................12
7.1 Routine Maintenance.......................................................................................................................12
7.2 Replacement Parts ..........................................................................................................................13
8Wiring Diagrams........................................................................................................14
8.1 K39190 Demulsibility Bath, 115V ....................................................................................................14
8.2 K39199 Demulsibility Bath, 220-240V.............................................................................................15
9Troubleshooting ........................................................................................................16
9.1 Unit does not power up....................................................................................................................16
9.2 Unit is on and keeps resetting into start up routine .........................................................................16
9.3 Unit is on but bath does not heat up................................................................................................16
9.4 Bath heats up but temperature does not stabilize ...........................................................................16
10 Service........................................................................................................................16
11 Storage.......................................................................................................................16

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12 Warranty.....................................................................................................................16
13 Returned Goods Policy.............................................................................................17
Notes..................................................................................................................................18

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1 Introduction
The Demulsibility Characteristics Stirrer and
Constant Temperature Demulsibility Bath test
the ability of medium to high viscosity oils to
separate from water when turbulence and
water contamination are encountered according
to the ASTM D2711 test method and related test
specifications.
This manual provides important information
regarding safety, technical reference, installation
requirements, operating condition specifications,
user facility resource requirements, and operating
instructions for the D3919X Demulsibility
Apparatus and Data Acquisition Software. This
manual should also be used in conjunction with
applicable published laboratory procedures.
Information on these procedures is given in
section 1.2.
1.1 Koehler’s Commitment to Our
Customers
Providing quality testing instrumentation and
technical support services for research and testing
laboratories has been our specialty for more than
50 years. At Koehler, the primary focus of our
business is providing you with the full support of
your laboratory testing needs. Our products are
backed by our staff of technically knowledgeable,
trained specialists who are experienced in both
petroleum products testing and instrument service
to better understand your requirements and
provide you with the best solutions. You can
depend on Koehler for a full range of accurate and
reliable instrumentation as well as support for your
laboratory testing programs. Please do not
hesitate to contact us at any time with your
inquiries about equipment, tests, or technical
support.
Toll Free: 1-800-878-9070 (US only)
Tel: [phone]
Fax: [phone]
Email: [e-mail]
http://www.koehlerinstrument.com
1.2 Recommended Resources and
Publications
1. American Society for Testing and Materials
(ASTM)
100 Barr Harbor Drive
West Conshohocken, Pennsylvania 19428-
2959, USA
Tel: [phone]
Fax: [phone]
http://www.astm.org
email: [e-mail]
ASTM Publication:
ASTM D2711: Standard Test Method for
Demulsibility Characteristics of Lubricating
Oils.
2. Deutsche International Norm (DIN)
http://www.din.de
DIN Publication:
DIN 51353
1.3 Instrument Specifications
Models:
K39190
K39199
Electrical
Requirements:
115V 50/60Hz
220-240V 50/60Hz
Maximum
Temperature:
100°C (212°F)
Temperature
Control:
Micro Processor digital
control with LED display
Capacity:
Two (2) sample-water
mixtures
Bath Medium:
Water or suitable heat
transfer fluid
Bath Medium
Capacity:
38.5L (9 gal)
2 Safety Information and Warnings
Safety Considerations. The use of this
equipment may involve hazardous materials and
operations. This manual does not purport to
address all of the safety problems associated with
the use of this equipment. It is the responsibility of
any user of this equipment to investigate,
research, and establish appropriate safety and
health practices and determine the applicability of
regulatory limitations prior to use.
Equipment Modifications and Replacement
Parts. Any modification or alteration of this
equipment from that of factory specifications is not
recommended voids the manufacturer warranty,
product safety, performance specifications, and/or
certifications whether specified or implied, and
may result in personal injury and/or property loss.

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Replacement parts must be O.E.M. exact
replacement equipment.
Unit Design. This equipment is specifically
designed for use in accordance with the applicable
standard test methods listed in section 1.2 of this
manual. The use of this equipment in accordance
with any other test procedures, or for any other
purpose, is not recommended and may be
extremely hazardous.
Chemical Reagents Information. Chemicals and
reagents used in performing the test may exhibit
potential hazards. Any user must be familiarized
with the possible dangers before use. We also
recommend consulting the Material Data and
Safety Sheet (MSDS) on each chemical reagent
for additional information. MSDS information can
be easily located on the internet at
http://siri.uvm.edu or http://www.sigma-
aldrich.com.
3 Getting Started
The instructions for preparing the equipment
assume that the user is aware of the contents of
this document, which lists the warranty conditions
and important precautions.
3.1 Packing List
K39190/K39199
Demulsibility Constant
Temperature Bath,
115V 60Hz
220-240V 50/60Hz
K3919X-Manual
Operation and Instruction
Manual
Accessories (purchased separately, see Section
4.2 for more information):
K39180-SFW
Demulsibility Apparatus
Software Package
K39103
Demulsibility Stirrer
K39120
Separatory Funnel
K39130
Solvent Tank
K39140 / K39149
Forced Warm Air Dryer
(115V / 220-240V)
K39150
Sampling Gauge and
Centering Device
360-000-003
Digital Tachometer
250-000-09F
250-000-09C
ASTM 9F Thermometer
ASTM 9C Thermometer
K39170 / K39179
Conditioning Bath
115V 60Hz
220-240V 50/60Hz
3.2 Unpacking
Carefully unpack and place the instrument and
accessories in a secure location. Use extra care
while unpacking the Pyrex®glass jar. Ensure that
all parts listed on the packing list are present.
Inspect the unit and all accessories for damage. If
any damage is found, keep all packing materials
and immediately report the damage to the carrier.
We will assist you with your claim, if requested.
When submitting a claim for shipping damage,
request that the carrier inspect the shipping
container and equipment. Do not return goods to
Koehler without written authorization.
3.3 Setup
Equipment Placement. Place the instrument on a
firm, level table in an area with adequate
ventilation or in a hood. The unit may be leveled
by making minor turning adjustments to the feet
located at the base of the unit. Please note that
Koehler does not supply a level with this
equipment.
Ventilation. A fume hood or exhaust system is
required when operating the unit. Flammable
vapors and/or steam are generated during
operation and must not be permitted to
accumulate. A canopy-style hood may be used if
the height from the top of the unit to the canopy is
5 feet or less. The exhaust blower should have a
rating of 1000 C.F.M. or greater.
Power. Connect the line cords to properly fused
and grounded receptacles 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. Do NOT turn the power on unless the
bath is filled with the proper medium; otherwise,
damage may occur to the unit and the warranty
will be void.

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4 Descriptions
4.1 Instrument Controls
Figure 2: Instrument Descriptions
1. Power Switch. This switch controls the power
to the entire unit. When the power switch is in
the ON position, the digital temperature
controller, the speed controllers and timers are
turned on.
2. Lamp Switch. This switch controls turning
ON/OFF the lamp for illuminating the test
samples.
3. Temperature Controller. The temperature
controller regulates the bath temperature for
the test procedure. Refer to Section 4.3 for full
operational details.
4. Timer: The apparatus consists of two digital
timers located on the left and right sides for
stirrer 1 and 2. These two timers are
independent of one another and can be set
using the up and down arrow keys. The run
time is set in minutes and counts down to
the end of the run The Start/Stop button is
used to start the motor and override the
counter for emergency stops.
5. Speed Controller / Tachometer: The speed
for each stirrer can be controlled and
displayed independently through the use of
the two controllers located at the top of the
apparatus. The digital tachometer registers
the motor speed in units of RPM. The
speed of the right and left stirrer motors can
be changed using the up and down arrows on
the tachometer. Some fluctuation of the
reading is to be expected as the motor turns,
but the stirrer will meet and exceed the ASTM
specifications. At the end of the run, the
tachometer may continue to display a reading
for about 30 seconds. Please ignore this as
the Tachometer will reset to zero momentarily.
6. Stirrer: The Demulsibility apparatus is
capable of holding two Stirrer assemblies.
These stirrers mount vertically in the
apparatus. The stirrer assemblies are
described in more detail in section 4.2 of this
manual.
7. Constant Temperature Bath: 9 gallon
(38.5L) capacity constant temperature bath
controlled by temperature controller described
in section 4.3 of this manual. Capable of
holding and maintaining the temperature of
two separatory funnels and stirrers.
4.2 Accessories for Running Tests
K39103 Demulsibility Stirrer
Complete stirrer assembly per Fig. 1 and Fig. 2
of ASTM D2711, including variable high speed
drive motor, stainless steel propeller shaft, top,
center and bottom bearings, and steel motor
housing with positioning plate. Entire assembly
mounts vertically in the K3919X Constant
temperature bath. Built in tachometer disc allows
for precise stirrer speed adjustment.
K39120 Separatory Funnel
Designed specifically to meet ASTM D2711 Fig.
3 requirement. Graduated from 0-500mL.
Solvent Tank
Immerses stirrer assembly for convenient
cleaning after testing.

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WARNING: The use of flammable cleaning
solvents is extremely hazardous and ignition may
occur. It is imperative that this instrument be
cleaned with only 1,1,1 –Trichloroethane in
accordance with the procedure described in ASTM
D2711. 1,1,1 –Trichloroethane is harmful if
inhaled or swallowed. Eye Irritant. High
Concentration can cause unconsciousness or
death.
K39140 / K39149 Forced Warm Air Dryer
Available in both 115V 50/60Hz and 220-240V
50/60Hz models High Output 1400W dryer and
brass cylinder mounted on a sturdy bass. Used to
rapidly dry stirrer assembly after cleaning. See
Figure 3 below:
Figure 3: Forced Warm Air Dryer
K39150 Sampling Gauge and Centering Device
Aids in accurately obtaining 50mL samples from
separatory funnels for the ‘percent water in oil’
determination. Designed specifically to meet
ASTM D2711 Fig. X1.1 requirement.
K39170 / K39179 Conditioning Bath
Available in both 115V 60Hz and 220-240V
50/60Hz models. Constant temperature water bath
holds 8 separatory funnels in two removable 4-unit
racks for conditioning prior to testing in
Demulsibility Apparatus. Includes microprocessor
digital temperature control, automatic water level
control and gabled cover.
360-000-003 Digital Tachometer
Handheld non-contact LCD tachometer takes
measurements up to 3 ft away with ±1rpm
accuracy. Supplied with four 1.5V AA batteries
250-000-09F / 250-000-09C ASTM 9F/9C
Thermometer
The ASTM 9F thermometer has a temperature
range from 20 to 230°F. The ASTM 9C
thermometer has a temperature from -5 to 110°C.
4.3 Temperature Controller Operation
Figure 4. Temperature Controller
1. Process Temperature Display. The
upper red LED display shows the process
temperature as read from the RTD probe.
2. Set Point Temperature Display. The
lower green LED display shows the set
point temperature of the controller.
3. Programming Key. Permits scrolling
through controller menu parameters. One
Level Forward
4. Down Key. Used to decrease the set
point temperature and to decrease or
change parameter values when
programming the temperature controller.
5. Up Key. Used to increase the set point
temperature and to increase or change
parameter values when programming the
temperature controller.
6. Exit / Function Key. This key is used to
exit or leave a level. One level backward

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IMPORTANT NOTE: 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.
Setting the Temperature. Set the desired
operating temperature by adjusting the set
point with the up and down keys. The set point
will be displayed in the lower green Set Point
LED display and the actual temperature will be
displayed in the upper red Process LED
display. Please allow the instrument to fully
equilibrate before proceeding with any testing.
Temperature Calibration. This routine allows the
digital temperature controller to be calibrated
to a certified thermometer.
a. Use a certified calibrated measuring
device to acquire the temperature.
Calculate the difference between the
measuring device and the Process value
displayed on the controller.
b. Press the program key two times until PCt
is displayed in the lower green LED
display. Press the DOWN key. CAL will
display on the lower green display. If there
is a value observed in the upper red LED
display, add it to the calculated difference
obtained in the previous step. This is the
offset value.
c. Press the Program Key. The lower green
display will flash. Use the up or down keys
to adjust to the new calibration offset
value on the upper red display calculated
in the previous step. When the value has
been entered, the controller will
automatically store the value. The lower
green display will stop flashing. If further
adjustments are necessary, press the
Program Key again. Resume regular
operations by pressing the Exit / Function
key two times. Verify if the new calibration
is correct by observing the upper red
display and comparing the value with the
calibrated reference device.
Auto Tune. This routine allows the digital
temperature control to learn the heating
parameters needed for any particular set point
temperature. This operation should be done
when installing a new unit, after replacing or
changing the bath medium type, or utilizing a
different temperature set point 20% different
from the previously used set point
temperature.
a. Set the operating temperature to the
desired setting.
b. Press the up and down arrow buttons
simultaneously for about 5 seconds. When
Auto Tune is active, the lower green LED
display will blink TUNE. Auto Tune will
automatically toggle off when the set point
temperature is reached. Auto tune can be
terminated by pressing the up & down
buttons simultaneously again.
5 Operation
5.1 Bath
Fill the bath with the appropriate heat transfer
fluid based upon the testing temperature. Fill the
bath with the medium to 2" (5 cm) from the top of
the bath to allow room for fluid expansion. This will
provide the proper depth for immersing the
separatory funnels and allow for thermal
expansion. Install the RTD probe into the cork
holder at the top of the bath Place an ASTM 9C or
9F thermometer in the thermometer holder.
Testing
Temperature
Recommended Fluid
4 - 50°C*
Distilled water will be suitable.
Above 50°C
Koehler supplies highly refined white
technical oil (part # 355-001-001) that
contains an oxidation inhibitor to limit
clouding at higher temperatures.
5.2 Power
Turn on the main power switch to the unit.
WARNING: Do NOT turn the power on unless the
bath is filled with the proper medium; otherwise,
damage may occur to the unit and the warranty
would be void.

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5.3 Install the K39103 Demulsibility
Stirrer
1. Place the Separatory funnel containing the
prepared sample into the K3919X
Demulsibility Bath using the stainless steel
spring clips to hold the glassware firmly.
2. Place the K39103 Stirrer assembly in the
drainage position (upper bracket), aligning it
so that the lower part of the stirrer extends into
the funnel.
3. Connect the two two-pin electrical leads at
the end of the stirrer to the connectors on
the bath. There are corresponding cables for
the left and right positions of the bath.
5.4 Operation Procedure
1. When the sample is at test temperature,
lower the stirrer from the drainage position
(upper bracket) to the test position (lower
bracket). Adjust the separatory funnel height
so that the bottom of the stirrer housing is 1
inch (2.54 cm) from the bottom of the funnel.
To make this adjustment, carefully slide the
funnel up or down as required.
2. Adjust the speed on the Tachometer. Set the
desired test time on the Digital Timer.
3. Turn on the Stirrer Motor by pushing the Start
button on the Digital Timer. The stirrer motor
will start and the timer will begin to countdown.
4. To adjust the speed to the proper R.P.M
setting, use the digital tachometer at the top of
the instrument. A separate calibrated digital
tachometer (part# 360-000-003) can be
purchased from Koehler used to check the
accuracy of the installed meter. The
optional hand-held non-contact LCD
tachometer takes measurements up to 3 feet
away with ± 1 R.P.M. accuracy. If used, the
digital tachometer should be held 18
inches from the rotating motor for best results.
An instruction manual is provided
with the tachometer.
5. Proceed to test in accordance with an
applicable standard test method.
5.5 Cleaning the Stirrer
When the test procedure has been completed,
clean the stirrer by immersing it in the solvent tank
containing 1,1,1 –Trichloroethane and operating it
at high speed for several minutes.
WARNING: The use of flammable cleaning
solvents is extremely hazardous and ignition may
occur. It is imperative that this instrument be
cleaned with only 1,1,1 –Trichloroethane in
accordance with the procedure described in ASTM
D2711.
Shut the Stirrer motor off and remove it from the
solvent tank. Allow the stirrer to air dry or use a
forced warm air dryer if the stirrer is to be reused
immediately.
6 Safety Features
The Koehler K3919X Demulsibility Apparatus is
equipped with several safety and protection
features, which are described in the following
sections.
6.1 Over-Temperature Protection
The Koehler K3919X Demulsibility Apparatus is
equipped with Over-temperature Protection (OTP)
circuitry, which prevents the unit from exceeding
unsafe operating temperatures. If the unit cannot
maintain the set point temperature and begins to
decline, the OTP circuitry may have been
activated. Please follow these steps.
1. Turn off the unit power switch and disconnect
the line cord.
2. Determine the source of the problem and
correct the situation.
3. Restart the unit. Monitor the operations to
ensure that the unit is operating properly. If
you are still experiencing trouble, please
contact Koehler technical service for
assistance.
6.2 Over-Power Protection
The Koehler K3919X Demulsibility Apparatus is
equipped with Over-power Protection circuitry,
which prevents the unit from unsafe electrical
conditions. If power to the unit is lost, then turn off
the main power and turn it back on again. The
main power switch also functions as a circuit
breaker.

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7 Maintenance
WARNING. Disconnect power to the unit before
servicing to avoid exposure to high voltages
and/or temperatures which may result in personal
injury or death. If you have any questions about
maintaining your equipment, then please do not
hesitate to contact the Koehler technical service
department.
7.1 Routine Maintenance
The K3919X Demulsibility Apparatus requires
little routine maintenance to provide many years of
continuous service. However, over the course of
time, some instrument parts may need to be
replaced. When ordering replacement part(s),
please provide the model number, serial number,
and product shipment date of your equipment so
that we can ensure you will receive the proper
replacement part(s).

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7.2 Replacement Parts
K3919X Demulsibility Characteristics Bath
K39103 Demulsibility Characteristics Stirrer
Part Number
Description
349-000-011
Flex Motor Coupling x 1/4 bore
289-002-015
Bearing, Flange ¼ ID x 3/8 OD x ½ L
160-104-002
Bearing, Sleeve ¼ ID x 3/8 OD x 3/8 L
289-002-014
Bearing ¼ ID x 3/8 OD x 3/4 L
288-024-001
Motor, DC Brushless, 24 VDC
Part Number
Description
275-103-044
Temperature Controller, 100-240V /2out
265-500-001
RTD Temp. Probe ¼ x 12”
381-115-003
Electronic Timer 115V 50/60 Hz
381-230-003
Electronic Timer 230V 50/60 Hz
091-032-001
Solid State Relay 4-31V DC 20A
K23700-03013A
Motor 115V 60Hz 1/20HP SS Shaft
K23700-03014A
Motor 230V 50/60HZ 1/15HP
K39180-0-10
Heater, 1000W, 115V
K39189-0-10
Heater, 1000W, 230V
360-115-016
Digital Tachometer
275-020-001
Motor Controller
090-120-014
Relay, 120V, 10A, SPDT
090-240-018
Relay, 240V, 10A, SPDT
279-115-002
Fluorescent Lamp
330-100-001
Starter Socket
240-230-014
Ballast, 230V, 50Hz
335-115-001
Fan 115V
335-230-001
Fan 230V, 50/60Hz
278-001-002
Fuse 1A, Slow-Blow Midget, 5 x 20mm
278-002-002
Fuse 2A, Slow-Blow Midget, 5 x 20mm
278-020-002
Fuse 20A, Slow-Blow Midget 250V
K294-0-14A
Stirrer Shaft and Blade Assembly

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8 Wiring Diagrams
8.1 K39190 Demulsibility Bath, 115V

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8.2 K39199 Demulsibility Bath, 220-240V

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9 Troubleshooting
WARNING: Troubleshooting procedures involve
working with high voltages and/or temperatures
which may result in personal injury or death, and
should only be performed by trained personnel.
Please do not hesitate to contact Koehler for
assistance.
9.1 Unit does not power up
1. Establish that the socket outlet is providing
proper and adequate voltage.
2. Check if Overpower Protection circuitry
located directly behind the temperature
controller inside the front tray has been
activated.
3. Check if line switch is in the ON position.
4. If problem persists, please call the Koehler
technical service department for assistance.
9.2 Unit is on and keeps resetting into
start up routine
For 220V units, make sure that the socket
outlet is greater than 215V.
Check if there is a steady and reliable power
source.
Make sure the connector plug on the rear
panel is firmly plugged in.
9.3 Unit is on but bath does not heat up
Make sure that the actual temperature
reading is not higher than the set-point
temperature.
Determine if the temperature controller is
properly calibrated by comparison to an
ASTM standard thermometer.
Determine if the Over Temperature
Protection (OTP) circuitry as been activated.
9.4 Bath heats up but temperature does
not stabilize
Make sure there are no drafts from open
doors, windows, or environmental control
vents in the vicinity of the bath.
If the set temperature is close to ambient,
then you may need to circulate cold water
through the coils in order to achieve proper
temperature stability.
10 Service
Under normal operating conditions and with
routine maintenance, the K3919X Demulsibility
Apparatus should not require service. Any service
problem can be quickly resolved by contacting
Koehler’s technical service department either by
letter, phone, fax, or email. In order to assure the
fastest possible service, please provide us with the
following information.
Model Number:
Serial Number:
Date of Shipment:
11 Storage
This laboratory test instrument is equipped with
electrical components. Storage facilities should be
consistent with an indoor laboratory environment.
This testing equipment should not be subjected to
extremes of temperature and/or moisture.
This equipment was shipped from the factory in
a corrugated cardboard container. If long term
storage is anticipated, re-packing the instrument in
a water-resistant container is recommended to
ensure equipment safety and longevity.
12 Warranty
We, at Koehler, would like to thank you for your
equipment purchase, which is protected by the
following warranty. If within one (1) year from the
date of receipt, but no longer than fifteen (15)
months from the date of shipment, Koehler
equipment fails to perform properly because of
defects in materials or workmanship, Koehler
Instrument Company, Inc. will repair or, at its sole
discretion, replace the equipment without charge
F.O.B. its plant, provided the equipment has been
properly installed, operated, and maintained.
Koehler Instrument Company must be advised in
writing of the malfunction and authorize the return
of the product to the factory. The sole
responsibility of Koehler Instrument Company and
the purchaser’s exclusive remedy for any claim
arising out of the purchase of any product is the
repair or replacement of the product. In no event
shall the cost of the purchaser’s remedy exceed
the purchase price, nor shall Koehler Instrument
Company be liable for any special, indirect,
incidental, consequential, or exemplary damages.
KOEHLER INSTRUMENT COMPANY, INC.

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DISCLAIMS ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTIES OF FITNESS FOR A
PARTICULAR PURPOSE. Please save the
shipping carton in the event the equipment needs
to be returned to the factory for warranty repair. If
the carton is discarded, it will be the purchaser’s
responsibility to provide an appropriate shipping
carton.
13 Returned Goods Policy
To return products for credit or replacement,
please contact Koehler Customer Service with
your purchase order number, our packing
list/invoice number, the item(s) to be returned and
the reason for the return. You will be issued a
Returned Authorization (RA) number, which must
be prominently displayed on the shipping
container when you return the material to our
plant. Shipping containers without an RA number
prominently displayed with will be returned to the
sender. Goods must be returned freight prepaid.
Returns will be subject to a restocking charge, the
application of which will depend upon the
circumstances necessitating the return. Some
returns cannot be authorized, including certain
products purchased from outside vendors for the
convenience of the customer, products
manufactured on special order, products shipped
from the factory past ninety (90) days, and
products which have been used or modified in
such a way that they cannot be returned to stock
for future sale.

K3919X Demulsibility Characteristics Bath
Operation and Instruction Manual
K3919X-Manual -18-
Notes

K3919X Demulsibility Characteristics Bath
Operation and Instruction Manual
K3919X-Manual -19-
Notes