Koehler K1223 Series Guide

Operation and Instruction Manual
REV C
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
K1223X
High Temperature Convertible Oxidation
Bath

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
CERTIFICATE OF CONFORMANCE
Oxidation Stability Bath
K122XX
This certificate verifies that part number K122XX, Oxidation Stability Bath, was
manufactured in conformance with the applicable standards set forth in this
certification.
Specifications: ASTM D943
ASTM D2274
ASTM D2893
ASTM D4310
ASTM D6158
ACOS CD12-57
DIN 51586
DIN 51587
ISO 4263
ISO 12205
NF M 07-047
NF T 60-150
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

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
Table of Contents
1Introduction ...................................................................................................................5
1.1 Koehler’s Commitment to Our Customers .............................................................................................5
1.2 Recommended Resources and Publications.........................................................................................5
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.......................................................................................................10
5Operation .....................................................................................................................11
5.1 Bath......................................................................................................................................................11
5.2 Power ...................................................................................................................................................11
5.3 Flowmeter Calibration Procedure.........................................................................................................11
5.4 Flowmeter Calibration Data..................................................................................................................11
6Safety Features............................................................................................................12
6.1 Over-Temperature Protection ..............................................................................................................12
6.2 Over-Power Protection.........................................................................................................................12
7Maintenance.................................................................................................................13
7.1 Routine Maintenance ...........................................................................................................................13
7.2 Replacement Parts...............................................................................................................................13
8Wiring Diagrams..........................................................................................................14
8.1 K12230 Unit Wiring ..............................................................................................................................14
8.2 K12239 Unit Wiring ..............................................................................................................................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

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
12 Warranty.......................................................................................................................16
13 Returned Goods Policy...............................................................................................17
Notes..................................................................................................................................18

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
1 Introduction
The Koehler High Temperature Convertible
Oxidation Bath is a constant temperature oil bath
with solid state temperature control, calibrated flow
meters and a condenser water manifold for
oxidation stability and corrosiveness tests on
inhibited steam turbine oils, distillate fuel oils,
mineral transformer oils, extreme-pressure fluid
lubricants, gear oils, mineral oils, inhibited mineral
oil based steam turbine oils, mineral oil based anti-
wear hydraulic oils and diesel engine oil. The
instrument is a fully customizable oxidation bath
available with a selection of Sample Racks and
Flowmeter Stands to conform to a wide range of
standard test methods including ASTM D943,
D2274, D2440, D2893, D4310, D4636, D4871,
D5968, D6594, DIN 51394, DIN 51586, DIN
51587, FTM 791-5307, FTM 791-5308
specifications, which evaluates the oxidation
characteristics of oils in the presence of oxygen
and catalysts at elevated temperatures.
This manual provides important information
regarding safety, technical reference, installation
requirements, operating condition specifications,
user facility resource requirements, and operating
instructions for the High Temperature Convertible
Oxidation Bath 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 D943: Oxidation Characteristics of
Inhibited Mineral Oils
ASTM D2274: Oxidation Stability of Distillate
Fuel Oil
ASTM D2440: Oxidation Stability of Mineral
Insulating Oil
ASTM D2893: Oxidation Characteristics of
Extreme Pressure Lubrication Oils
ASTM D4310: Determination of Sludging
and Corrosion Tendencies of Inhibited
Mineral Oils
ASTM D4636: Corrosiveness and Oxidation
Stability of Hydraulic Oils, Aircraft Turbine
Engine Lubricants, and Other Highly
Refined Oils
ASTM D4871: Standard Guide for Universal
Oxidation / Thermal Stability Test Apparatus
ASTM D5968: Evaluation of Corrosiveness
of Diesel Engine Oil at 121°C
ASTM D6594: Evaluation of Corrosiveness
of Diesel Engine Oil at 135°C
2. International Organization for Standardization
(ISO)
1, rue de Varembé
Case postale 56
CH-1211 Geneva 20, Switzerland
Tel: [phone]
Fax: [phone]
http://www.iso.org
ISO Publication:
ISO 4263: Petroleum Products –Inhibited
Mineral Oils –Determination of Oxidation
Characteristics

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
ISO 12205: Petroleum Products –
Determination of the Oxidation Stability of
Middle Distillate Fuels
3. Energy Institute (IP)
61 New Cavendish Street
London, WIM 8AR, United Kingdom
Tel: [phone]
Fax: [phone]
http://www.energyinstpubs.org.uk/
IP Publication:
IP 388
4. Deutsche International Norm (DIN)
http://www.din.de
DIN Publication:
DIN 51394
DIN 51586
DIN 51587
5. Federal Test Method (FTM)
FTM Publication:
FTM 791-5307
FTM 791-5308 (with ten-unit test holder)
1.3 Instrument Specifications
Models:
K12230
K12239
Electrical
Requirements:
115V 60Hz, 27.3A
220-240V 50/60Hz,
14.6A
Temperature Range:
Ambient to 200°C
(392°F)
Temperature Control
Stability:
±0.2°F (±0.1°C)
Test Capacity:
Dependent on Sample
Rack Type
K1223-R943 -
12
K1223-D2440 -
12
K1223-D4636 -
10
Flow Rate:
Dependent on
Flowmeter Stand Type
K1223-3L -
3 ± 0.1 L/hr
K1223-10L -
10 ± 0.5 L/hr
Bath Capacity:
19 gal (72L)
Bath Medium:
Silicone Heat Transfer
Fluid
Dimensions:
(w x d x h, in.(cm))
25.5 x 24 x 42
(65 x 61 x 107)
Net Weight:
60 lbs (27.22kg)
Shipping Dimensions:
29 Cu. ft.
Shipping Weight:
213 lbs (96.6 kg)
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.
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.

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
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
K1223X High Temperature Convertible
Oxidation Bath
K70519 RTD Temperature Probe Assembly
K1223X-Manual High Temperature Convertible
Oxidation Bath Operation and Instruction
Manual
Accessories (purchased separately, see Section
4.2 for more information):
K12200-SFW Oxidation Stability Software
Package
3.2 Unpacking
Carefully unpack and place the instrument and
accessories in a secure location. 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.
Air Supply Requirement. This unit requires an air
source capable of supplying a flow rate of 94 or
167 mL/min per test cell depending on type of flow
meter installed. The air should be free from
moisture, oil, and particulate matter. A drying
tower should be incorporated to remove any
contaminants. Air inlet pressure should not exceed
10 psi.
NOTE: Koehler Instrument does not supply air
source required for running instrumentation.

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
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, power is supplied to the unit,
turning on the digital temperature controller.
2. Motor Switch. This switch controls turning
ON/OFF the motor for stirring the bath
medium.
3. Temperature Controller. The temperature
controller regulates the bath temperature for
the test procedure. Refer to Section 4.3 for full
operational details.
4. Flowmeter Adjustment Knob. Used to adjust
inlet flowrate during Flowmeter Calibration and
Testing Procedure.
5. Flowmeter. For indicating and monitoring of
the Oxygen flow rate during the test method.
6. Motor. Powers the stirring shaft and blade for
stirring the bath medium for bath temperature
uniformity.
7. Oxidation Test Cell Assembly. Oil Sample is
placed within oxygen test tube and is
contacted with oxygen in the presence of
water and an iron-copper catalyst at an
elevated temperature.
8. Water Outlet. Water exit location of internal
oxygen cooling manifold system. Bath
consists of eight outlet nozzles equipped with
turn valves.
9. Water Inlet. Point of connection for Water
feed for internal oxygen cooling manifold
system.
10. Air Inlet. Point of connection for Oxygen feed
to Oxidation bath. For Flowmeter Calibration,
Certified Flowmeter is to be connected to this
inlet. Flowmeter Calibration is discussed in
detail in section 5.4 of this operation manual.
4.2 Accessories for Running Tests
The following accessories may be purchased
separately for use with the K12230 / K12239
Convertible Oxidation Bath:
For ASTM D943 and D4310:
Part Number
Description
K12281
Oxidation Cell Assembly
Consisting of:
(2) Viton O-Ring
(1) Oxygen Delivery Tube
(1) Oxygen Test Tube
(1) Condenser
(1) Thermometer Bracket
(1) Oil Level Indicator Strip
(1) Sampling Tube Holder
(1) Sampling Tube Spacer
(1) PTFE Stopper
(1) Syringe Sampling Tube
Flexible Tubing
For delivery of Oxygen to the
Oxidation Cell
250-002-001
Oxidation Cell Thermometer
Range: 80 to 100°C
K12210
Catalyst Coil
Low-metalloid steel wire and
electrolytic copper wire wound in a
double spiral. Packed in a sealed
glass tube with a Nitrogen
Atmosphere. Ready for use.

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
250-000-40C
ASTM 40C Thermometer
Range: 72 to 126°C
380-100-001
Silicone Carbide Paper
Used to polish steel and copper
wire prior to winding into catalyst
coils. 100-grit with cloth backing.
K24000
Wire Coiling Mandrel
Mounts on bench for winding steel
and copper wire into catalyst coils
meeting ASTM specifications.
K12250
Steel Wire
Low metalloid steel wire, 0.0625”
(1.59mm) diameter, for catalyst
coils. Supplied in 1000 ft (304.8m)
lengths.
K12260
Copper Wire
Electrolytic copper wire, 0.064”
(1.63mm) diameter, for catalyst
coils. Supplied in 1000 ft (304.8m)
lengths.
For ASTM D2274:
Part Number
Description
K122-0-18
Oxygen Delivery Tube
K122-0-19
Oxidation Test Tube
K122-0-20
Condenser
250-000-40C
ASTM 40C Thermometer
Range: 72 to 126°C
For ASTM D2440:
Part Number
Description
K12110-01000
Oil Receptacle and Head Set
K12130
Copper Catalyst Coils
Sealed in a glass jar with a
nitrogen atmosphere. Pack of 24
(12 sets)
332-005-010
Drying Tower
250mL with ground glass stopper
and side tubes
332-005-011
Glass Filter Crucible
250-000-40C
ASTM 95C Thermometer
Range: 100 to 130°C
For ASTM D2893:
Part Number
Description
K122-0-18
Oxygen Delivery Tube
K122-0-19
Oxidation Test Tube
K122-0-31
Slotted Cork Stopper for Test
Tube
250-000-40C
ASTM 40C Thermometer
Range: 72 to 126°C
For ASTM D4636, D5968, D6594:
Part Number
Description
K351-0-1
Sample Tube
K351-0-2
Sample Tube Head
K351-0-3
Air Tube
K351-0-4
Thermocouple Tube
K351-0-5
Condenser, Allihn Type
K351-0-6
Oil Sampling Tube (for D4636)
K351-0-7
Spacer
K351-0-8
PTFE Adapter
K351-0-13
Oil Sampling Tube (for D5968 and
FTM 791-5307)
K351-0-14
Specimen Hanger (for D6594)
K293-0-12
Thermocouple, Type J
K29319
Digital Thermometer, 220-240V
Microprocessor based digital
thermocouple thermometer with
ten-channel input.
Monitors Type J thermocouples
from sample tubes.
K35090
Test Panel Assembly Fixture
Holds square-shaped metal
specimens for tying with cord (for
ASTM D4636 Alternate procedure
and FTM 791-5308)
K35095
Test Panel Assembly Fixture
Holds square-shaped metal
specimens for typing with cord (for
ASTM D5968)

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
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
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.

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
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
WARNING: Be sure to read the safety and hazard
warnings, the installation procedure and any of the
standard test methods mentioned in the
introduction before operating this instrument.
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
viscometers and allow for thermal expansion.
Testing
Temperature
Recommended Fluid
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.
Above 110°C
Koehler supplies a clear silicone heat
transfer fluid (part # 355-001-002) with
high oxidation resistance and low
volatility.
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.
5.3 Flowmeter Calibration Procedure
Prior to testing, the flow meters should be set to
deliver 3 L/hr of oxygen to the samples for test
methods D943, D2274, D2440 and D4310.
Calibrate the Flowmeters to 10 L/hr for test
method D2893, D4636, D5968 and D6594.
To calibrate the Flowmeters on the instrument it is
necessary to have an additional Calibrated and
Certified Flowmeter capable of reading the air flow
rate for your desired range.
1. Connect the air source to the Calibrated and
Certified Flowmeter.
2. Connect the Certified Flowmeter to the Air
Inlet Connection on the Flowmeter Rack of the
Oxidation Bath.
NOTE: Each Flowmeter must be calibrated
individually.
3. Turn off all flowmeters except the flowmeter
you wish to calibrate by turning the adjustment
knobs counterclockwise.
4. Turn on Air Source and adjust Certified
Flowmeter to read desired flowrate (3 L/hr or
10 L/hr) depending on the type of flowmeter
being used. The reading should be taken from
the center of the ball.
5. Compare the reading on the Certified
flowmeter with the flowmeter being calibrated.
Adjust the flowmeter on the instrument to read
the same flowrate as the Certified Flowmeter.
6. Periodically check the flowmeter settings.
Once the flowmeters have been calibrated, it
should be unnecessary to reset the
flowmeters for as long as samples of similar
viscosity are being tested. Nevertheless, it is
recommended that the flowmeter settings be
checked periodically.
5.4 Flowmeter Calibration Data
3 L/hr Flowmeter K122-2-29
Max. Flow
73 mL/min
Min. Flow
3 mL/min
Metered Fluid
Air
Tube Number
032-41-SA
Float Material
Sapphire
Float Density
3.98 g/mL
Standard Conditions
STP: 1 atm at 70°C
Room Temperature
65.3°F (18.5°C)
Metering Temperature
70.0°F (21.1°C)
Metering Pressure
14.70 psia
Metering Density
0.001200 g/mL
Density at STD. Cond.
0.001200 g/mL
Metering Viscosity
0.01812 cp
Accuracy
Standard

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
Barometric Pressure
764.0 mm of Hg
Scale Reading (mm)
Flow (mL/min)
150
73.0
140
63.7
130
56.8
120
49.2
110
42.5
100
36.4
90
31.3
80
26.3
70
21.1
60
16.8
50
12.7
40
10.0
30
6.9
20
4.6
10
3.0
10 L/hr Flowmeter K127-2-29
Max. Flow
264.0 mL/min
Min. Flow
16.0 mL/min
Metered Fluid
Air
Tube Number
062-01-ST
Float Material
316 stainless steel
Float Density
8.04 g/mL
Standard Conditions
STP: 1 atm at 70°F
Room Temperature
70.0°F
Metering Temperature
70.0°F
Metering Pressure
14.70 psia
Metering Density
0.001200 g/mL
Density at STD. Cond.
0.001200 g/mL
Metering Viscosity
0.01812 cp
Accuracy
Standard
Barometric Pressure
760.0 mm of Hg
Scale Reading (mm)
Flow (mL/min)
150
264.0
140
233.5
130
203.5
120
178.0
110
156.0
100
137.0
90
118.0
80
100.0
70
83.5
60
67.8
50
55.5
40
45.0
30
34.5
20
24.5
10
16.0
6 Safety Features
The Koehler K12230 / K12239 Convertible
Oxidation Bath is equipped with several safety and
protection features, which are described in the
following sections.
6.1 Over-Temperature Protection
The Koehler K12230 / K12239 Convertible
Oxidation Bath 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 K12230 / K12239 Convertible
Oxidation Bath 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.

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
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 K12330 / K12339 Convertible Oxidation
Bath 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).
7.2 Replacement Parts
†For 115V model ONLY (K12230)
‡For 220V model ONLY (K12239)
Part Number
Description
050-001-028
Single Pole Switch, 15A
275-103-036
RTD Temperature Safety Limit,
120V†
275-103-037
RTD Temperature Safety Limit,
230V‡
278-104-002
Slow-Blow Fuse, .25A, 5x20mm
271-025-004
Circuit Breaker, 25 Amp, 2 Pole
265-600-001
RTD Temp Probe, .25 x 4”, 600F
275-103-024
Temperature Controller 100-240V, 1
out
K122-12-2-22A
Back Heater, 115V, 1500W†
K122-12A-2-22A
Back Heater, 230V, 1500W‡
K122-12-2-22B
Middle Heater, 115V, 1500W†
K122-12A-2-22B
Middle Heater, 230V, 1500W‡
K122-12-2-22C
Front Heater, 115V, 750†
K122-12A-2-22C
Front Heater, 230V, 750‡
K23700-03013A
Stainless Steel Shaft Motor, 115V,
60Hz, 1/20HP†
K23700-03014A
Stainless Steel Shaft Motor, 230V,
50/60W, 1/15HP‡
K70519
RTD Assembly
K122-2-29
Flowmeter with Curve, 3 L/hr
K127-2-29
Flowmeter with Curve, 10 L/hr

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
8 Wiring Diagrams
8.1 K12230 Unit Wiring

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
8.2 K12239 Unit Wiring

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
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 Overtemperature 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 K12230 / K12239
Convertible Oxidation Bath 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.

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
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.

K1223X High Temperature Convertible Oxidation Bath
Operation and Instruction Manual
K1223X-Manual
Notes