Manual of Operation and Instruction
Troxler NTO
Asphalt Content
Ignition Oven
Troxler Electronic Laboratories, Inc.
3008 Cornwallis Road • P.O. Box 12057
Research Triangle Park, NC 27709
Phone: 1.877.TROXLER
Outside the U.S.A.: +1.919.549.8661
Fax: +1.919.549.0761
www.troxlerlabs.com
Troxler products are protected by U.S. and foreign patents.
The Troxler NTO (New Technology Oven) Asphalt Content
Ignition Oven is protected by U.S. Patents US 6.054,323 and
US 6,436,718 and Canadian Patent CA 2,274,453.
Copyright © 2000 – 2009
Troxler Electronic Laboratories, Inc.
All Rights Reserved
No part of this manual may be reproduced or transmitted in any
form or by any means, electronic or mechanical, including
photocopying, recording, or information storage and retrieval
systems, for any purpose without the express written permission of
Troxler Electronic Laboratories, Inc.
Superpave is a trademark of the Strategic Highway Research
Program.
PN 109227
March 2009
Edition 5.0
ii
TROXLER SERVICE CENTERS
Troxler Corporate Headquarters
3008 Cornwallis Road
P.O. Box 12057
Research Triangle Park, NC 27709
Phone: 1.877.TROXLER (1.877.876.9537)
Outside the U.S.A.: +1.919.549.8661
Fax: +1.919.549.0761
Web: www.troxlerlabs.com
Technical Support
Phone: 1.877.TROXLER (1.877.876.9537)
E-mail: TroxTechSupport@troxlerlabs.com
Florida Service Center
2376 Forsyth Road
Orlando, FL 32807
Fax: 407.681.3188
Texas Service Center
2016 East Randol Mill Road
Suite 406
Arlington, TX 76011
Fax: 817.275.8562
Illinois Service Center
1430 Brook Drive
Downers Grove, IL 60515
Fax: 630.261.9341
Northern California Service Center
11300 Sanders Drive, Suite 7
Rancho Cordova, CA 95742
Fax: 916.631.0541
Troxler European Subsidiary
Troxler Electronics GmbH
Gilchinger Strasse 33
D.82239 Alling nr. Munich, Germany
Phone: ++49.8141.71063
Fax: ++49.8141.80731
E-mail: troxler@t-online.de
NOTE
To locate an independent, Troxler-authorized service
partner near you, call 1.877.TROXLER
(1.877.876.9537).
Troxler NTO iii
EU DECLARATION OF CONFORMITY
Application of Council EMC Directive 89/336/EEC, 93/42/EEC,
and Low Voltage Directive 73/23/EEC – as amended by
93/68/EEC.
Standards to which Conformity is Declared:
EN 61010–1+A2
EN 61326–1:1998
Manufacturer: Troxler Electronic Laboratories, Inc.
P.O. Box 12057
3008 Cornwallis Road
Research Triangle Park, North Carolina
27709
U.S.A.
Apparatus: Model 4730 and 4731
Asphalt Ignition Oven
Year of Declaration: 2000
iv
HOW TO USE THIS MANUAL
Before using the Troxler NTO (New Technology Oven) Asphalt
Content Ignition Oven or “oven,” read this manual carefully. Of
particular importance is the safety information in Chapter 2. Do not
attempt to op
safety warnings posted on the unit. Troxler stresses that the user is
solely responsible for ensuring the safe use of the oven. Neither the
manufacturer, its subsidiary, distributors, or representatives can
assume responsibility for any mishaps, damage, or personal injury
that may occur from failure to observe the safety warnings in this
manual and posted on the unit.
The oven allows measurement of the asphalt content of asphalt
mixes. After ignition testing, the remaining aggregates may be used
as sample for gradation measurements. The Troxler NTO Manual of
Operation and Instruction describes the installation, setup, and
operation of the system.
erate the oven before reading this manual and the
Troxler NTO v
CONVENTIONS USED IN THIS MANUAL
Throughout this manual, symbols and special formatting are used to
reveal the purpose of the text as follows:
WARNING
Indicates conditions or procedures that, if not followed
correctly, may cause personal injury.
CAUTION
Indicates conditions or procedures that, if not followed
correctly, may cause equipment damage.
NOTE
Indicates important information that must be read to
ensure proper operation.
〈KEY〉 Angle brackets and a different typestyle indicate a
key or character (number or letter) to press on the
oven keypad. For example, “Press 〈START〉”
means to press the key labeled START.
DISPLAY A different typestyle is used in text to indicate
information or messages displayed on the oven.
DISPLAY - Typestyle
and shading used to
simulate the oven
display
♦ Diamonds indicate a list of things needed (such as
equipment) or things to know.
Check marks indicate the performance of an action.
With lists of check marks, follow the instructions in
the order of the check marks.
f Triangles indicate that more than one option is
available. Carefully select the option that applies.
vi
TABLE OF CONTENTS
CHAPTER 1. INTRODUCTION TO THE TROXLER NTO
Introduction................................................................................... 1–2
About This Manual....................................................................... 1–4
Features of the Troxler NTO ........................................................ 1–5
Parts and Accessories.................................................................... 1–7
Unpacking and Inspecting ............................................................ 1–9
CHAPTER 2. PRODUCT SAFETY INFORMATION
Introduction................................................................................... 2–2
Cautions and Warnings.................................................................2–4
Safety Warnings............................................................................ 2–6
CHAPTER 3. INSTALLATION
Site Selection................................................................................ 3–2
Oven Installation........................................................................... 3–3
Exhaust System Installation.......................................................... 3–5
CHAPTER 4. SETUP AND OPERATION
Keypad..........................................................................................4–2
Printer ........................................................................................... 4–4
First-Time Startup and Setup........................................................4–5
Daily Startup and Operation......................................................... 4–8
Daily Shutdown ..........................................................................4–14
CHAPTER 5. MAIN MENU
Oven Main Menu..........................................................................5–3
Burn Setup Menu..........................................................................5–4
Auto-Timer................................................................................. 5–15
Project Menu............................................................................... 5–20
Correction Menu.........................................................................5–20
Scale Menu ................................................................................. 5–20
Status Menu................................................................................ 5–21
Store Function............................................................................. 5–24
Miscellaneous Menu................................................................... 5–27
CHAPTER 6. CALIBRATION
Correcting %AC Measurements................................................... 6–2
Correction Menu...........................................................................6–8
Scale Menu ................................................................................. 6–13
Troxler NTO vii
TABLE OF CONTENTS (Continued)
CHAPTER 7. HANDLING DATA
Projects..........................................................................................7–2
Project Menu .................................................................................7–3
APPENDIX A. MAINTENANCE AND SERVICE
Troubleshooting............................................................................A–2
Cleaning .......................................................................................A–4
Replacing Parts.............................................................................A–8
Replacement Parts......................................................................A–14
Returning Parts for Service ........................................................A–15
APPENDIX B. MENU MAP
Menu Map Description.................................................................B–2
APPENDIX C. SPECIFICATIONS
Environmental Conditions............................................................C–2
Performance Specifications..........................................................C–3
Electrical Specifications...............................................................C–4
Mechanical Specifications............................................................ C–5
INDEX
WARRANTY
viii
LIST OF FIGURES
Figure
1–1 Parts and Accessories................................................1–8
2–1 Basket
3–1 Overall Schematic for Exterior Wall and Roof
3–2 Exterior Wall Penetration Using a Metal Elbow and
3–3 Exterior Wall Penetration Using a Metal Wall Cap with
3–4 Roof Penetration........................................................3–9
3–5 Exhausting to a Fume Hood....................................3–10
4–1 Oven
4–2 Printer Front Panel ....................................................4–4
4–3 Sample Basket Assembly........................................4–10
5–1 Sample Reduced Printout........................................5–11
6–1 Sample Aggregate Correction Factor Form ..............6–4
A–1 Printer with Doors Open ........................................ A–10
A–2 Inserting the Paper Roll.......................................... A–10
A–3 Insert Paper into Slot..............................................A–11
A–4 Printer Paper with Bottom Door Open...................A–11
A–5 Printer with Lower Door Open............................... A–12
A–6 Installing the Printer Cartridge...............................A–13
B–1 Troxler NTO Menu Map...........................................B–3
Title Page
Carrier............................................................2–8
Penetrations
Cap ............................................................................3–7
Screen........................................................................3–8
...............................................................3–6
Keypad............................................................. 4–2
Troxler NTO ix
LIST OF TABLES
Title Page
Table
4-1 Oven Keys .................................................................4–3
5-1
Recommended Minim
um Burn Times.......................5–6
x
CHAPTER 1
INTRODUCTION TO THE TROXLER NTO
This chapter provides a brief overview of the Troxler NTO (New
Technology Oven) Asphalt Content Ignition Oven. This information
includes a list of the parts and accessories, as well as instructions for
unpacking and inspecting the oven upon receipt.
CONTENTS
Introduction................................................................................... 1–2
About This
Features of the Troxler NTO ........................................................ 1–5
Parts and Accessories.................................................................... 1–7
Unpacking and Inspecting
Manual....................................................................... 1–4
............................................................ 1–9
1. INTRODUCTION
Troxler NTO 1–1
INTRODUCTION
The two major components of hot-mix asphalt (HMA) are the
asphalt binder and the aggregate. Thus, accurate measurements of
the percent asphalt content (%AC) and aggregate gradation are
required for HMA quality control and assurance. The Troxler NTO
Asphalt Content Ignition Oven allows safe, quick, and reliable
measurement of the %AC of HMA samples and creates samples for
aggregate gradation measurements.
The oven employs a method developed by the National Center for
Asphalt Technology (NCAT) called pyrolysis, or ignition. In this
method, an HMA sample of known mass is prepared. The asphalt
binder in the sample is then burned. The change in sample mass
indicates the %AC. Standard sieve analysis of the remaining clean
aggregate provides the gradation.
The ignition oven test method is covered by the provisions of the
American Society of Testing and Materials (ASTM) Standard
D 6307, Standard Test Method for Asphalt Content of Hot-Mix
Asphalt by Ignition Method.
The oven can also be used in conjunction with a nuclear asphalt
content gauge, such as Troxler Models 3241–C, 3241 USS, and
3242. The nuclear gauge provides a fast method of measuring the
%AC when the aggregate gradation is not needed. The oven can be
used when a job requires aggregate gradation.
The nuclear gauge test method is covered by the provisions of the
ASTM Standard D 4125, Standard Test Method for Asphalt Content
of Bituminous Mixtures by the Nuclear Method. For more
information on Troxler's asphalt content gauges, contact your
Troxler representative.
1–2
WARNING
Do not attempt to operate the oven before reading this
manual and the safety warnings posted on the unit.
Troxler stresses that the user is solely responsible for
ensuring the safe use of the oven. Neither the
manufacturer, its subsidiary, distributors, nor
representatives can assume responsibility for any
mishaps, damage, or personal injury which may occur
from failure to observe the safety warnings in Chapter 2
of this manual and posted on the unit.
1. INTRODUCTION
Troxler NTO 1–3
ABOUT THIS MANUAL
The Troxler NTO Manual of Operation and Instruction provides
detailed information about the oven. The manual includes product
safety information, as well as instructions for selecting an
installation site, installing the oven, and using the oven to burn
HMA samples and to store sample data.
This manual is organized as follows:
Chapter 1, Introduction to the Troxler NTO – Provides a brief
overview of the oven and i
and accessories, and instructions for unpacking and inspection.
ts features, as well as a list of parts
Chapter 2, Product Safety Information – Includes inform
the safe use of the oven.
Chapter 3, Installation – Contains instructions for i
oven, including the criteria for selecting an installation site.
Chapter 4, Setup and Operation – Describes the oven keypad, and
provides instructions for setting u
shutting down the oven.
Chapter 5, Main Menu – Provides a detailed description of the
oven software, including examples and explanations of the
control menus.
Chapter 6, Calibration – In
correction factors, and for calibrating the integrated scale.
Chapter 7, Handling Data – Contains instructions on creating and
using project files and desc
download data.
Appendix A, Maintenance and Service – Provides maintenance
and service information, as well as instructions on basic
troubleshooting.
Appendix B, Menu Map – Shows a map of the menus in the oven
control software.
cludes instructions for determining
p, starting, operating, and
ribes how to view, erase, print, and
nstalling the
ation on
Appendix C, Specifications – Contains the environmental,
performance,
oven.
1–4
electrical, and mechanical specifications of the
FEATURES OF THE TROXLER NTO
The oven incorporates a number of features that provide
unparalleled efficiency, safety, usability, and flexibility.
The oven heats the HMA sample using an infrared (IR) element.
The use of IR radiation serves two purposes: it limits the heating of
the aggregate material in the HMA sample while producing a very
efficient and clean burn process.
The oven can be powered from a 120 V ac, 50/60 Hz, 12 A source
(Model 4730) or from a 208–240 V ac, 50/60 Hz, 12/13 A source
(Model 4731). The oven is therefore convenient for use in
construction trailers, where power sources may be limited.
The oven door lock helps ensure operator safety. The oven monitors
the state of the door, and will not apply electrical power to the IR
element if the door is open. The oven door is locked automatically
at the start of a burn cycle. The door remains locked until five
minutes have elapsed since the chamber temperature has peaked or
since the 〈ABORT〉 key was pressed.
1. INTRODUCTION
The sample basket assembly is designed to provide operator safety
while handling HMA samples, and to ensure an even burn of the
asphalt binder. A basket carrier is provided for lifting the baskets in
and out of the oven. A sample safety cage shields the hot sample
basket assembly while the asphalt sample cools.
The integrated scale continuously monitors the sample mass loss
during a burn cycle.
The oven features an Auto-Tare function that automatically tares
(zeroes) the integrated scale when no mass is present. The oven
software also enables the operator to tare the scale manually, to
calibrate the scale, and to verify the scale calibration.
The oven keypad and internal logic provide control, data storage,
and output flexibility. The keypad enables the operator to set up and
operate the oven, to store sample data, to calibrate and verify the
integrated scale, and to enter correction factors.
The oven includes an Auto-Timer function that can preheat the oven
automatically based upon start and stop dates and times entered by
the operator.
Troxler NTO 1–5
The oven features two audible indicators, an internally mounted
beeper and a louder annunciator mounted on the rear panel. The
beeper emits a short beep in response to a valid keystroke on the
oven keypad. It sounds a longer beep when the operator presses an
invalid key or the oven displays an error message. The annunciator
sounds when the door is unlocked at the completion of a burn cycle.
The red BURN COMPLETE indicator on the front panel also
lights when the door is unlocked.
The internal printer enables the operator to print sample data and
system status information, either automatically or manually.
Two ports, a serial communications port and an auxiliary port, are
mounted on the rear panel of the oven. The serial communications
port, the leftmost of the two ports (as viewed from the rear of the
oven), is used to output data to a serial device, such as a computer
or printer. The auxiliary (right) port is intended for factory use only.
The oven stores up to twenty user-defined aggregate correction
factors (ACFs), which are percentage values used to adjust the
measured asphalt content for specific aggregates.
During a burn cycle, the oven displays measurement units of
percent loss (%Loss). The %Loss measurement is the difference
between the sample weights before and after the burn cycle,
expressed as a percentage of the starting mass.
The oven offers two burn modes. The burn time can be set manually
by the operator (Program Time mode), or it can be adjusted
automatically by the oven (Auto-Control mode). In Auto-Control
mode, the oven limits the burn time according to the cutoff limit
specified by the operator. The cutoff limit can be defined in grams
or as a percentage.
The oven features three burn profiles, which define the operation of
the oven during a burn cycle. The Default profile should be used for
most materials; the two optional profiles can be used to optimize the
burn cycle for less standard mixtures.
The oven can store data for up to 200 HMA samples. Sample data is
stored in project files created by the operator. Up to twenty project
files can be defined. Sample data is stored in the active project file,
either manually using identification numbers entered by the
operator, or automatically using the Auto-Store function.
1–6
PARTS AND ACCESSORIES
Figure 1–1 shows the Troxler NTO and its accessories. Use this
figure to locate and identify the followi
1. The oven contains the electronics and IR heating element to
burn the asphalt binder from the aggregate. The oven includes
an internal printer used to print sample data and system status
information. An integrated scale (not shown) monitors mass
loss throughout the burn cycle. The oven’s exhaust duct vents
fumes produced during the ignition to a suitable ventilation
system.
2. The hearth plate (not shown) provides even distribution of heat
beneath the sample baskets.
3. The basket cover fits over the sample baskets.
4. The stackable sample baskets (2) hold the HMA sample for
burning.
5. The catch pan catches aggregate particles that may fall through
the bottom of the sample basket(s).
ng parts:
1. INTRODUCTION
6. The basket carrier provides added safety when moving the
sample basket assembly in and out of the oven.
7. The sample safety cage (not shown) shields the hot sample
basket assembly while the asphalt sample cools.
8. The soft-bristled brush (not shown) is used to brush soot from
the turbine blades of the oven’s exhaust fan when cleaning the
exhaust plenum box.
9. Insulated gloves* (not shown) protect hands and forearms
when moving the heated sample basket(s).
10. The Troxler NTO Manual of Operation and Instruction (not
shown) details how to operate and maintain the oven.
* Operators should verify that the insulated gloves meet local
safety laws and specifications.
Troxler NTO 1–7
S
OVEN
CIRCUIT BREAKER/
POWER SWITCH
BASKET
COVER
SAMPLE
BASKETS
INTERNAL
PRINTER
LOCK ARMS
KEYPAD
EXHAUST
DISPLAY
DUCT
ACCES
PANEL
CATCH
PAN
BASKET CARRIER
Figure 1–1. Parts and Accessories
1–8
UNPACKING AND INSPECTING
NOTE
To ensure the safe return of the oven to Troxler for
repair or maintenance, please keep the original shipping
box, pallet, and all packing materials. The box folds for
easy storage.
Upon receiving the oven from the factory:
1. Perform a complete inspection and inventory. If the shipping
case and/or any other part or accessory appears damaged, notify
the carrier and your Troxler representative immediately.
2. Cut the nylon bands from around the carton, then lift off the top
half of the box, and remove all accessory items.
3. Remove any packing material packed around the oven or inside
the oven chamber. Save all packing material, including the
plastic sheet used to cushion the inside of the chamber door
during shipping, for reuse if the oven needs to be returned for
service or repair. The box folds for easy storage.
4. Remove the bottom half of the box.
1. INTRODUCTION
Troxler NTO 1–9
5. Check the shipping case for the following items:
♦ Oven
♦ Hearth plate
♦ Sample basket assembly, including sample baskets (2),
catch pan, and basket cover
♦ Basket carrier
♦ Insulated gloves*
♦ Sample safety cage
♦ Exhaust duct
♦ Duct adapter, 3- to 4-inch
♦ Clamp, 4-inch hose
♦ Brush, soft-bristle
♦ Troxler NTO Manual of Operation and Instruction
♦ Material Safety Data Sheet (MSDS) Information Kit
6. Inspect the outside surfaces of the oven and accessories for
damage.
* Operators should verify that the insulated gloves meet local
safety laws and specifications.
1–10
CHAPTER 2
PRODUCT SAFETY INFORMATION
This chapter provides basic product safety information concerning
the Troxler NTO Asphalt Content Ignition Oven, as well as cautions
and warnings related to the safe use of the oven.
CONTENTS
Introduction................................................................................... 2–2
Cautions and
Safety Warnings
Warnings................................................................. 2–4
............................................................................ 2–6
2. PRODUCT SAFETY
Troxler NTO 2–1
INTRODUCTION
The Troxler NTO Asphalt Content Ignition Oven is designed to be
safe for the user. The system uses modern, refractory ceramic fiber
(RCF) materials to provide highly efficient insulation of the heated
chambers. This material is completely enclosed, and should present
no health risk to the operator during normal use in accordance with
this manual. RCF can present a potential health hazard if the fibers
become airborne and thus become respirable. Since, under normal
operating conditions, the design of the oven completely encloses
these materials, fibers should not become airborne during normal
use. Therefore, no special precautions are necessary when using the
oven to perform asphalt content analysis.
Special precautions should be taken during maintenance operations
or other activities that involve removal of the system sheet-metal
covers. These maintenance operations should be performed only
by authorized, experienced maintenance personnel. They include
removal of the rear or top panels for troubleshooting, cleaning, or
making repairs.
During the performance of such maintenance operations, observe
the precautions set forth in the Material Safety Data Sheets
(MSDSs) enclosed with the product. Wear respirators approved by
the National Institute for Occupational Safety and Health (NIOSH)
to prevent possible inhalation of airborne ceramic fibers. Wear
gloves and long sleeve clothing to prevent irritation of the skin.
Wear safety goggles to prevent irritation of the eyes. Unplug the
oven from its power source before performing any maintenance
operations.
All maintenance operations should be performed with special effort
to minimize generating airborne fiber dust. Do not use compressed
air to clean and do not rub or wipe ceramic fiber surfaces. Although
no periodic cleaning of ceramic fiber surfaces is required, it is best
to use a vacuum cleaner equipped with a high-efficiency particulate
air (HEPA) filter system to remove any debris from the surfaces of
the ceramic fiber, if desired. This applies to the outside or inside of
the primary, heated oven chamber.
2–2
The oven is shipped with a packet of documentation that includes
MSDSs. In accordance with the Occupational Safety & Health
Administration (OSHA) Hazard Communication Standard (29 CFR
1910.1200), the MSDSs are designed to communicate important
information about the safe handling of refractory ceramic fiber
products, recommended protective measures, and health hazard
information.
For disposal information, please refer to the MSDSs enclosed with
the product. If you have any questions regarding these MSDSs,
please contact the nearest Troxler Service Center, as listed on
page iii.
2. PRODUCT SAFETY
Troxler NTO 2–3
CAUTIONS AND WARNINGS
Lower Rear of Oven (Identification of Interconnects)
♦ Cable for 120 V ac, 50/60 Hz (Model 4730) or 208–240
V ac, 50/60 Hz (Model 4731) power to the oven.
♦ The oven power source must have a reliable earth
ground connection, or a hazardous condition may occur
during oven operation.
♦ Two 9-pin serial interfaces: the left interface is used to
connect the oven to a serial device, such as a computer
or printer; the right interface is for factory use only.
Upper Right of Oven Door
♦ Surfaces of the oven are hot and may cause burns to
unprotected skin.
2–4
♦ Place oven on a non-combustible surface and 15 cm
(6 in.) away from any structure or other items.
♦ WARNING – Before opening the door, look through
the window to ensure that there is no combustion
occurring inside the oven.
♦ Always use the door as a shield when opening the door.
♦ If any flames appear at the top of the door, close it
immediately.
♦ When operating the unit, always wear protective
clothing.
Upper Sides of Oven
♦ Upper surfaces of the oven are hot and may cause burns
to unprotected skin.
♦ Place oven 15 cm (6 in.) away from any structure or
other items.
Top of Oven
♦ Upper surfaces of the oven are hot and will cause burns
to unprotected skin.
♦ During normal operations, the chamber door cannot be
opened during a burn cycle. However, if the door lock
should fail or be defeated by the operator, it may be
possible to open the door while combustion is occurring
inside the oven. If this should happen, flames may exit
from the top of the door. Therefore, there must be at
least 91 cm (3 ft) of clearance above the oven.
2. PRODUCT SAFETY
♦ WARNING – The unit must not be operated without an
exhaust system. Refer to Chapter 3 for information on
proper install
ation of the e
xhaust system.
Upper Rear of Electronics Module (Battery Holder)
♦ Carefully note the polarity of the DL2450 lithium
battery when installing it in the battery holder. A battery
may explode or leak if installed improperly.
♦ Do not dispose of batteries in a fire. A battery may
explode if exposed to excessive heat.
♦ If the lithium battery should leak, do not allow the
contents to come into contact with skin or eyes. If it
does, immediately wash the affected area with cold
water and seek medical advice.
Troxler NTO 2–5
SAFETY WARNINGS
The Troxler NTO Asphalt Content Ignition Oven is a safe, durable
unit. Troxler cannot anticipate every example of improper or
unauthorized use of this oven that may lead to malfunction or
accident. If a particular use is not specifically mentioned in this
manual as authorized, then assume that the use is unauthorized and
improper.
Always follow the safety warnings in this manual and the safety
procedures of your laboratory/company. Refer to the MSDSs
provided with each oven for further safety information. Troxler
recommends the following safety precautions.
READ ALL INSTRUCTIONS CAREFULLY
♦ The installation of t
code rulings.
♦ Troxler recommends the installation of a carbon monoxide
detector.
n must comply with local building
he ove
♦ Keep the area around the oven clear and free from all
combustible materials, gasoline, and other flammable vapors
and liquids. Failure to do so could cause fire or explosion.
♦ Place the oven on a level, sturdy, fireproof surface.
♦ The ambient temperature should be between 10 and 50 °C (50
and 122 °F), and the relative humidity should be less than 92%.
♦ Allow at least 15 cm (6 in.) between the oven and other vertical
structures.
♦ During normal operations, the chamber door cannot be opened
during a burn cycle. However, if the door lock should fail or be
defeated by the operator, it may be possible to open the door
while combustion is occurring inside the oven. If this should
happen, flames may exit from the top of the door. Therefore,
there must be at least 91 cm (3 ft) of clearance above the oven.
♦ Locate the oven no more than 1.2 m (4 ft) from the required
electrical power source (see Appendix C). Ensure that the
distance does
source
2–6
not place stress on the power cord. The power
must be wired by a qualified electrician.
♦ Connect the oven to a power source that provides proper voltage
and current (see Appendix C). Ensure that the oven, power
source, and ground co
de requirements are compatible.
♦ The oven power source must have a reliable earth ground
connection, or a hazardous condition may occur during oven
operation.
♦ Keep all cords away from the top and sides of the oven.
♦ Burning asphalt releases carbon monoxide. Ensure that the oven
is properly ventilated.
♦ Locate the oven in a well-ventilated room with access to a fume
hood or other suitable ventilation system. If the exhaust duct
shipped with the oven is used, locate the oven no more than
4.6 m (15 ft) from the exhaust outlet. Be sure to sufficiently
insulate the exhaust duct. Follow local code for exhaust outlet.
♦ Do not restrict the airflow in and around the bottom of the oven.
♦ Do not place any objects, other than those specified in this
manual, into the oven chamber.
♦ Remove all extraneous material in or around the oven.
♦ Keep the area around the oven clear and free from all
combustible materials, gasoline, and other flammable vapors
and liquids. Failure to do so could cause fire or explosion.
♦ Do not place anything on top of the oven.
♦ Never hit, puncture, or abuse the oven interior.
♦ Do not override the door lock.
♦ This oven should only be operated by personnel who are
familiar with the proper operation of the device.
♦ Do not use the oven for cooking, cleaning, or testing materials
other than asphalt or aggregate as defined by this manual.
2. PRODUCT SAFETY
♦ Do not attempt to dry any aggregates mixed with volatile
chemicals.
♦ Obtain and use appropriate safety equipment: heat-resistant
gloves that can withstand 650 °C, and a face shield to protect
the face.
Troxler NTO 2–7
S
S
♦ Troxler recommends wearing a face shield when handling hot
substances and operating the oven.
♦ Always wear heat-resistant gloves when handling hot
substances.
♦ Use the basket carrier to move hot sample baskets (see Figure
ys
2–1). Alwa
body, with the handle between your body and the open oven
door. This helps prevent the operator from backing into the hot
insulation on the inside surface of the door.
♦ Use care when loading and unloading the oven to avoid
touching or scraping the hearth plate, chamber sides, or IR
element.
♦ Avoid bodily contact with the IR element.
♦ Step away from the oven during ignition.
♦ If you see or smell smoke, discontinue use until the cause is
determined and corrected.
♦ Before opening the oven door, ensure that there is no glare on
the window due to light sources. If there is a glare, turn OFF
enough lights in work area to eliminate glare. Standing at a safe
distance from the oven, look into the window on the front of the
oven. If NO flame is visible, open the door cautiously.
keep the basket carrier to the left side of your
HANDLE
2–8
CAUTION
THE
E ARE NOT HANDLE
Figure 2–1. Basket Carrier
♦ Following a burn cycle, cover the asphalt sample and basket
assembly with the sample safety cage while the sample cools.
♦ To prevent personal injury, do not touch the interior or exterior
oven surfaces (except door and control panel) during use.
♦ Depending upon environmental and other conditions, the oven
can take several hours to cool off after power is removed from
the IR element. Do not touch the interior or exterior oven
surfaces (except door and control panel) for an extended period
after use.
♦ Only qualified personnel (Troxler service representatives)
should perform service and maintenance on the oven when
disassembly is required.
♦ Always unplug the oven before performing service or
maintenance.
♦ Allow the oven to cool completely before performing service or
maintenance.
♦ Soot may build up in the exhaust connector and pipe. Troxler
recommends that the exhaust plenum box be cleaned after every
30 burn cycles, as described on page A–5.
2. PRODUCT SAFETY
Troxler NTO 2–9
NOTES
2–10
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