Koehler K18854 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
K18854, K18864, K18855, K18865
Low Temperature Torque Apparatus

Low Temperature Torque Apparatus
Operation and Instruction Manual
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Operation and Instruction Manual
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CERTIFICATE OF CONFORMANCE
Low Temperature Torque Apparatus
K188XX
This certificate verifies that part number K188XX, Low Temperature Torque
Apparatus, was manufactured in conformance with the applicable standards set
forth in this certification.
Specifications: ASTM D1478
ASTM D4693
ASTM D4950
FTM 791-334
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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WEEE Directive Compliance Statement
Background
The goal of the WEEE Directive is to encourage design of environment-friendly products that increase reuse,
recycling and other forms of recovery to reduce waste streams and applies to listed Electronic and Electrical
Equipment (EEE) and Koehler's equipment falls broadly into Appendix 1A; Section 9 Monitoring and Control
Equipment: Measuring, weighing or adjusting appliances for household or as laboratory equipment.
Any associated non-embedded equipment such as Lighting (Saybolt Color) and PCs/Printers also fall under WEEE.
If provided with an order these ancillary items must be WEEE compliant. For these and other reasons (printer
cartridges are regionalized) the equipment must be supplied through a third party supplier in Europe.
The WEEE Directive applies to electrical and electronic equipment falling under the categories set out in Annex IA
provided that the equipment concerned is not part of another type of equipment that does not fall within the scope
of this Directive. Annex IB contains a list of products which fall under the categories set out in Annex IA.
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2003:037:0024:0038:en:PDF
We do not qualify for any of the 10 exemption categories.
http://www.dpa-system.dk/en/WEEE/Products/Exemptions
Professional use
For equipment defined for ’professional use’ local authorities have no role to play. Producers and importers are
basically responsible for collection of WEEE recyclables from the professional user and for subsequent
management. A separate statement is given cataloging the items that require separation from the equipment
along with basic information on subsequent processing or recycling prior to disposal of the equipment.
http://www.dpa-system.dk/en/WEEE/Products/Private-or-professional-use
Responsibility for Registration and Annual Reporting:
Koehler will not sell directly to end users in the EU and so has no responsibility to register within each EU state and
to make annual reports. Koehler declares that this responsibility is born by the importer who is the first level of the
distribution chain and is subject to producer responsibility. We will communicate this in writing to our
distributor/importers in the EU stating they are responsible to satisfy WEEE registration and reporting requirements
in the EU states where they conduct sales activities.
It is illegal to market electrical and electronic equipment covered by producer responsibility without being
registered.
http://www.dpa-system.dk/en/WEEE/Producers/Whoissubjecttoproducerresponsibility
Product Design
Koehler's designs allow for complete disassembly to a modular level which usually allows for standard recycling. A
qualified refrigeration system technician must be consulted when disassembling and de-commissioning any
equipment with refrigeration systems.
Koehler's scientific testing equipment is robustly designed to function over a long service life and are typically
repaired many times over the course of years rather than being replaced. We believe that re-use and
refurbishment is the very best form of re-cycling.
All batteries must be readily removable not soldered in place.
Recycling instructions
In the event that replacement becomes necessary, we will include instructions, particularized to each instrument
that informs the customer of their recycling responsibilities and giving them guidance in doing this. All Koehler
equipment has been placed on the market since 13th August 2005 and so Koehler is defined as a "new WEEE
producer". As such we must provide information on refurbishment, treatment, and re-use.

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Our instrument manual will include this compliance statement and indicate that any collection of materials will be
handled by their authorized distributor. In the event that the distributor is unreachable or is no longer a distributor
for Koehler Instrument, Co., other arrangements may be made including accepting the materials directly.
Recycling is free of charge. Shipping is the responsibility of the end users. Whether shipping to a distributor or to
Koehler directly, safe, properly declared, and labeled packaging and shipping expenses are the sole responsibility
of the end user.
WEEE Marking
Since Koehler products are subject to the WEEE Directive we must display the WEEE symbol shown above in
accordance with European Standard EN 50419 on the equipment. It must be indelible, at least 5mm in height, and
clearly legible. If the equipment is too small the mark must be in the product literature, guarantee certificate, or on
the packaging. Rules on marking are established in section 49 of the WEEE Order.
Koehler Instrument Company, Inc.
c/o RECYCLING
1595 Sycamore, Ave.
Bohemia, NY 11716
As a minimum the following substances, preparations and components have to be removed from any separately
collected WEEE:
- Mercury containing components, such as switches or backlighting lamps (compact fluorescent lamps, CFL),
- Batteries
- Printed circuit boards if the surface of the printed circuit board is greater than 10 square centimeters (about 4 sq
in.),
- Toner cartridges, liquid and pasty, as well as color toner,
- Chlorofluorocarbons (CFC), hydrochlorofluorocarbons (HCFC) or hydrofluorocarbons (HFC), hydrocarbons (HC)
- Liquid crystal displays (together with their casing where appropriate) of a surface greater than 100 square
centimeters and all those back-lighted with gas discharge lamps,
- External electric cables
- Components containing refractory ceramic fibers as described in Commission Directive 97/69/EC of 5 December
1997 adapting to technical progress Council Directive 67/548/EEC relating to the classification, packaging and
labeling of dangerous substances (2),
- Electrolyte capacitors containing substances of concern (height > 25 mm, diameter > 25 mm or proportionately
similar volume)
2. The following components of WEEE that is separately collected have to be treated as indicated:
- Equipment containing gases that are ozone depleting or have a global warming potential (GWP) above 15, such
as those contained in foams and refrigeration circuits: the gases must be properly extracted and properly treated.
Ozone-depleting gases must be treated in accordance with Regulation (EC) No 2037/2000 of the European
Parliament and of the Council of 29 June 2000 on substances that deplete the ozone layer (4).

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Table of Contents
1Introduction..................................................................................................................9
1.1 Koehler’s Commitment to Our Customers.........................................................................................9
1.2 Recommended Resources and Publications.....................................................................................9
1.3 Instrument Specifications...................................................................................................................9
2Safety Information and Warnings.............................................................................10
3Getting Started...........................................................................................................10
3.1 Packing List......................................................................................................................................10
3.2 Unpacking........................................................................................................................................11
3.3 Setup................................................................................................................................................11
4Descriptions...............................................................................................................12
4.1 Instrument Controls..........................................................................................................................12
4.2 Temperature Controller Operation...................................................................................................12
5Operation....................................................................................................................14
5.1 Preparation for Operation ................................................................................................................14
5.2 Operating Instructions......................................................................................................................14
5.3 Calibration Procedure......................................................................................................................15
6Safety Features..........................................................................................................16
6.1 Over-Temperature Protection..........................................................................................................16
6.2 Over-Power Protection.....................................................................................................................16
7Maintenance...............................................................................................................17
7.1 Routine Maintenance.......................................................................................................................17
7.2 Replacement Parts ..........................................................................................................................17
8Wiring Diagrams........................................................................................................18
8.1 K18864 Unit Wiring (220-240V 60Hz) .............................................................................................18
8.2 K18865 Unit Wiring (220-240V 60Hz) .............................................................................................19
9Service........................................................................................................................20
10 Storage.......................................................................................................................20
11 Warranty.....................................................................................................................20
12 Returned Goods Policy.............................................................................................20
Notes..................................................................................................................................21

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1 Introduction
The Koehler Low Temperature Torque
Apparatus determines the extent to which a
sample grease retards rotation of a test bearing
when subjected to low temperatures. A grease
sample is packed into an automotive wheel
bearing or a slow speed ball bearing and cold
soaked at the test temperature. The spindle
(automotive grease) or inner bearing ring (ball
bearing grease) is then rotated at 1 RPM while the
restraining force on the test rig is measured and
displayed digitally. Torque values calculated from
the force determinations measure the viscous
resistance of the grease. Models equipped with
the optional data acquisition system provide a test
record for reporting purposes.
This manual provides important information
regarding safety, technical reference, installation
requirements, operating condition specifications,
user facility resource requirements, and operating
instructions for the Low Temperature Torque
Apparatus. 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: [email protected]
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: [email protected]
ASTM Publication:
ASTM D1478: Standard Test Method for
Low Temperature Torque of Ball Bearing
Grease
ASTM D4693: Standard Test Method for
Low Temperature Torque of Grease
Lubricated Wheel Bearings
ASTM D4950: Standard Classification and
Specification of Automotive Service
Greases
2. Federal Test Method (FTM)
FTM Publication:
FTM 791-334: Grease Torque Test
1.3 Instrument Specifications
Models:
K18854, K18855
K18864, K18865
Electrical
Requirements:
220-240V 50Hz 20 A
220-240V 60Hz 20 A
Temperature
Range:
Ambient to -54°C (-65°F)
(Models K18854 and
K18864 only)
Optional
Temperature
Range:
Ambient to -73°C (-100°F)
(Models K18855 and
K18865 only)
Temperature
Control Stability:
±1°F (±0.5°C)
Refrigeration:
Air Cooled Mechanical
Cascade Hermetic System
Cabinet:
Floor-mount, polished
stainless steel exterior,
rides on swivel casters

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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.
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
Low Temperature Torque Apparatus with Test
Rigs for ASTM D1478 (1) and ASTM D4693 (1)
installed.
K18860-0-43A Mounting Rod (1)
K18860-0-43A Calibration Weights (4)
K185-0-47B Bearing Packer (1)
K185-0-51B Large Bearing Cup Remover (1)
K185-0-51A Small Bearing Cup Remover (1)
K185-0-50 Bearing Installer (1)
K185-0-56 Bearing Cup Installer (1)
K185-0-44 Bearing Holder
K18860-0-23 Sleever Trust Indicator
K18854-Manual Low Temperature Torque
Apparatus Operation and Instruction Manual
Additional Accessories (purchased separately)
K18871 Data Acquisition Package
289-001-006 Test Bearing, 6204, for ASTM
1478
K18860-0-24 Inboard Test Bearing, for ASTM
D4693, LM-67010-LM-67048 tapered roller
bearing
K18860-0-16 Outboard Test Bearing for ASTM
D4693, LM-11910-LM-11949 tapered roller
bearing
Additional Required Materials
1,1,1-Trichloroethane
WARNING: –Harmful if Inhaled. High
concentrations may cause unconsiousness or
death. Contact may cause skin irritation or
dermatitis. Eye Irritant. May produce toxic
vapors if burned.
Stoddard Solvent
WARNING: –Combustable. Health
Hazard. Keep away from heat, sparks, and open
flames. Avoid build-up of vapors and eliminate
all sources of ignition, especially non-explosion
proof electrical apparatus and heaters. Avoid
prolonged breathing of vapor or spray mist.
Avoid contact with eyes and skin
n-Heptane
WARNING: –Flammable. Health hazard.
Keep away from heat, sparks, and open flames.
Keep container closed. Use with adequate
ventiliation. Avoid prolonged breathing of vapor or
spray mist. Avoid prolonged or repeated skin
contact.
Laboratory Oven
Capable of maintaining 70 ± 3°C
Ultrasonic Cleaner
Bransonic 220 or Equivalent
Nylon Spatula
Run-in Stand for D4693 Test Bearing

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Koehler model K18500 High Temperature
Wheel Bearing Grease Tester is suitable for this
purpose. Alternatively, a drill press may be used
if the proper speed, load and duration can be
maintained
Arbor Press
3.2 Unpacking
This unit comes packed in a crate. Remove the
bath from the crate and place on the floor with
approximately 12” of space between the back of
the bath and the wall for airflow. Blocking the
airflow will cause a malfunction to occur.
WARNING: Be sure two or more individuals
are available for extracting and moving the
instrument from box to the floor. Individuals must
lift in accordance to proper technique. See Figure
below.
Unwrap the unit and wipe the shell with a soft cloth
to remove smudges caused by wrapping material.
Very high ambient temperatures would also affect
the efficiency of the unit. It is advisable to maintain
the environment of the machine below 22.78°C
(73°F).
Connect the line cord to a properly fused and
grounded receptacle with the correct voltage as
indicated in section 1.3.
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.
It is strongly suggested that a voltage
stabilizer be used to prevent voltage
variability. The unstable voltage may cause
damage to the unit.
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. Choose a location that
accommodates the following dimensional
requirements:
Length (side-to-side): 5 ft. (1.53m)
Depth (front-to-back): 3 ft. (1.0m) plus 6 in. (15
cm) for air circulation
After uncrating, roll the unit into position, allowing
6 inches (15.25 cm) of clearance in back of the
unit for air circulation, then chock in place.
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
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 torque meters, compressors
and drive systems of the unit are powered on.
2. Temperature Controller. The temperature
controller regulates the chamber temperature
for the test procedure. Refer to Section 4.2 for
full operational details.
3. Spindle Temperature: Displays the
temperature of the interior of the ASTM D4693
test rig in °C.
4. Left Drive Motor Switch: Controls the ASTM
D1478 test rig motor drive
5. Right Drive Motor Switch. Controls the
ASTM D4693 test rig motor drive
6. Torque: Two meters display the load values
(NOT THE TORQUE VALUES) from the test
rigs in lbs, arranged as follows:
ASTM D1478 Test Rig –Left side meter
ASTM D4693 Test Rig –Right side meter
Over-torque cut-off feature –The torque
meter is equipped with an automatic cut-off
that interrupts power to the drive motor when
measured torque exceeds a programmed
limit. This limit is factory preset at 55 lbs to
protect the load cell and drive system
components.
To reset the drive unit after cut-off, depress
both buttons on the face of the meter
simultaneously and release.
To charge the cut-off limit:
a) Depress the button on the right side of the
meter to confirm the current cut-off valve.
b) While depressing the button, adjust the
value by turning the recessed set screw on the
face of the torque meter with a small slotted
screwdriver.
CAUTION –Do not adjust the cut-off value
higher than 55 lbs or damage to the drive
system and/or load cell may occur during
operation.
4.2 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.

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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.
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.

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5 Operation
5.1 Preparation for Operation
Preparing the ASTM D1478 Test Rig
1. Follow the procedure outlined in ASTM D1478
for selecting and preparing the test bearing.
Use the supplied bearing spindle and grease
cup to pack the test bearing.
2. Insert the packed test bearing into the test
housing and secure the clamp cap securely
over the test bearing
Preparing the ASTM D4693 Test Rig
1. Prepare the bearings for packing by solvent
washing them as per the method and
permitting them to air dry.
NOTE: New bearings must be
conditioned by rotating them at 1000 RPM at
room temperature for 48 hours under a load of
110 NM.
2. Pack the bearings with the test grease as
specified in the method using a grease
packer.
3. Press the bearing cups into the test hub using
the supplied cup fixture and an arbor press.
Be certain that the bearing cups are fully
seated in the housing.
NOTE: Never use a hammer or any
other object to “knock” the bearing cups into
place. This may result in damage to the test
housing.
4. Slide the inner bearing onto the spindle
locating the keyway on the shaft with the
notch on the inside of the bearing. Be careful
not to rotate the bearings during assembly.
Next, place the bearing housing on the
spindle. Followed by the outer bearing.
5. Install the inner compression plate onto the
shaft with the shouldered end facing away
from the hub. Slide on the spring followed by
the outer compression plate with the shoulder
facing the hub. Slip on the washer and thread
on the nut, but do not tighten.
6. Carefully mount the test assembly in a vertical
position in a vise equipped with soft jaws.
Position the test spindle so that the flat face of
the spindle contacts the jaws. Tighten the vise
just enough to secure the spindle.
7. Slip on the brass calibration cylinder and
tighten the nut until the compression washer is
flush with the top of the brass cylinder. The
unit now has a 400N load on it.
8. Slide the thermocouple into the end of the test
rig and tighten the nut. Remove the test rig
from the vise.
9. Place the test rig in an oven at 70°C for one
hour prior to testing, as per ASTM D4693
specifications.
5.2 Operating Instructions
1. Set the Cold Chamber Temperature:
a) Turn the POWER Switch to the ON
position, followed by the BLOWER Switch.
b) Set the temperature by using the
ascending and descending arrows on the
Chamber temperature control.
c) When the chamber has cooled to the test
temperature as indicated on the chamber
temperature display, allow several minutes for
the temperature to stabilize before
proceeding.
2. Insert the Test Rig:
a) Open the cabinet cover and latch the
cover supports in place.
CAUTION: Never leave the cover open while
the unit is unattended. Injury or damage to
components may occur should the cover
unexpectedly drop. Remove the Plexiglas
vapor barrier.
b) Insert the test rig onto the appropriate
shaft and fasten in place:
ASTM D1478 –Left
ASTM D4693 –Right
For ASTM D4693: Connect the thermocouple
in the test rig to the plug inside the cold
chamber.
3. Position the Test Rig Relative to the Load
Cell:

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For ASTM D1478:
Attach one end of a connecting cord of
suitable length to the test rig as indicated
in ASTM D1478 and the other end to the
hook on the load cell rod in the chamber.
Use the DRIVE Switch to position the test
rig and take slack out of the cord,
observing the precautions in ASTM
D1478.
For ASTM D4693:
Using the DRIVE Switch, rotate the test rig
so that the torque arm is positioned
slightly (not more than 3mm) above the
load cell contact but not touching. Do not
position the torque arm by rotating it
relative to the hub.
4. Cold-Soak the Test Rig:
a) Replace the plexiglass vapor barrier and
close the cover.
b) Allow the cold chamber to recool to the
test temperature.
c) Cold-soak the test rig in accordance with
the applicable specification:
ASTM D1478 –3 hours
ASTM D4693 –5 hours
5. Start the Torque Determination:
At the end of the cold-soak period, start the
torque determination as follows:
a) Measure and record the temperature of
the test rig (ASTM D4693).
b) Turn the DRIVE Switch to the ON position
and allow the unit to operate for the required
test duration. Make the necessary torque
observations as per the test method standard.
6. Remove the Test Rig:
When the test is completed, shut down the
drive unit and remove the test rig. Clean
immediately or place in an oven at 70°C to
preclude rusting (ASTM D4693). Refer to the
applicable test method standard for
information on cleaning and storage of
bearings and test rigs.
7. Dry the Test Chamber:
After testing has been completed and the
refrigeration system shuts down, allow the test
chamber to return to room temperature before
wiping it dry with a clean cloth. This will
minimize frosting of the chamber and the
cooling coils during the next usage.
5.3 Calibration Procedure
There are two procedures for calibrating the strain
gauges and load cells. Calibration Method “A”
uses an electronic resistance standard to insure
proper calibration of the torque measuring
instrument. This is the primary procedure for
calibrating. Procedure “B” conforms to ASTM
D4693 and should be used only as a secondary
check after calibration by Method “A”.
NOTE: Calibration Procedure “A” is
performed at the manufacturer’s facility and should
be performed on an annual basis thereafter.
Calibration procedure “B” can be performed for
verification purposes.
Load Cell Calibration Method “A”:
1. Remove the access panel on the right side of
the torque cabinet. This will allow access to
the rear of the strain gauge meters. Remove
the plastic cover on the front of strain gauge
indicator by placing the tip of a jeweler’s
screwdriver under the bottom center of the
bezel and lifting.
2. Turn on the power to the cabinet and permit
the displays to stabilize. On the left side of
each meter are two set screws. The top one is
the zero adjust and the bottom one is the span
adjustment. Using a jeweler’s screwdriver, set
the meters to read zero using the zeroing
adjustment.
3. Turn off the main power and connect the 60K
Ohm resistor supplied with the load cell to the
following materials:
Calibration for the right-side (ASTM D4693)
Test Rig:
One end of the resistor is inserted into
Terminal 4 (black wire) and the other end is
inserted into Terminal 6 (green wire).

Low Temperature Torque Apparatus
Operation and Instruction Manual
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4. Turn on the power to the unit and permit the
display to stabilize. Check the panel reading
against the reading in the load cell manual.
Adjust as necessary using the setscrew on the
lower left side of the panel meter. Confirm that
the serial number of the load cell corresponds
with the one in the manual.
Calibration for the left-side (ASTM D1478)
Test Rig:
NOTE: Resistor value and load cell
constants are pre-programmed in the display
meters. Only need to calibrate with standard
weights provided.
With no rod attached and no load applied on
the left side the display should read “0”.
Screw in rod and place load #1 onto the rod.
The display should now read a negative value
of 11 lbs. Each additional weight should
register an additional 11 lbs. Continue adding
loads until reaching desired calibration range.
Adjust span screw on display accordingly to
calibrate to equivalent negative weight.
Calibration Procedure “B” ASTM D4693 only:
Included with the Low Temperature Torque
Apparatus is a set of 5 kg calibration weights.
Three of these weights are 5 kg. The fourth,
marked #1, totals 5 kg when used with the
threaded support rod. These weights are to be
used to measure calibrate the ASTM D4693 load
cell only.
1. Turn the power on and let the unit run for
several minutes.
2. Remove the threaded rod from the load cell
and zero the strain gauge indicator.
3. Insert the weight support rod and slip on the
weight marked #1. The strain gauge should
display 11 lbs. Each additional weight should
register an additional 11 lbs. Adjust the span
screw to make any correction.
NOTE: Handle weights very carefully
when placing them on the load cells as they
are delicate instruments. Rough handling of
the weights may change their 5 kg value.
Load Spring Calibration
Check the calibration of the load spring on the
ASTM D4693 test rig four times per year. A
calibrated spring tester is recommended for this
purpose.
6 Safety Features
The Koehler Low Temperature Torque
Apparatus is equipped with several safety and
protection features, which are described in the
following sections.
6.1 Over-Temperature Protection
The Koehler Low Temperature Torque
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 Low Temperature Torque
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.

Low Temperature Torque Apparatus
Operation and Instruction Manual
K18854,55,64,65-Manual -17-
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
For maximum refrigeration efficiency,
periodically remove the front louvers and clean the
condenser with either compressed air or a
vacuum. When the air chamber is at room
temperature, wipe away any moisture that has
accumulated. This will minimize frosting of the
cooling coil. Change the oil in the speed reducers
once per year using the oil specified in the
manual. Wash the test rig components in a
suitable solvent and air dry. Do not permit wet rigs
to sit out as the components will corrode. Wipe
down the exterior of the cabinet using a soft cloth
sprayed with household cleaner. 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
Part Number
Description
050-001-033
Switch, Blower Interlock
050-230-002
Switch, Rocker Green Lens, 230V
090-240-021
Contactor, DPST, 30A, 240V
091-032-001
Relay, Solid State, 4-32 VDC, 20A
275-103-037
Temp Safety Limit, 230V, RTD
278-001-002
Fuse, 1A, Slo-Blo, 5 x 20 mm
278-002-002
Fuse, 2A, Slo-Blo, 5 x 20 mm
278-020-004
Fuse, 20A, 600VAC, Time Delay
278-104-002
Fuse, .25A Slo-Blo 5 x 20 mm
301-002-007
Timing Belt
K18860-1-30
Test Shaft Method D1478
360-000-001
Load Cell
360-230-001
Strain Gauge Indicator, 230VAC
289-001-006
Test Bearing
289-001-009
Ball Bearing

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Operation and Instruction Manual
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8 Wiring Diagrams
8.1 K18864 Unit Wiring (220-240V 60Hz)

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Operation and Instruction Manual
K18854,55,64,65-Manual -19-
8.2 K18865 Unit Wiring (220-240V 60Hz)