Thermo Scientific STF55433 User manual

Installation and Operating Manual
305435H03 • Revision B • November 2020
Thermo Scientific Lindberg/Blue M 1500°C
General-Purpose Tube Furnaces
Models: STF55433

© 2020 Thermo Fisher Scientific Inc. All rights reserved.
Thermo Fisher Scientific Inc. provides this document to its customers with aproduct purchaseto usein theproduct operation. This
document is copyright protected and any reproduction of thewholeor any part of this document is strictly prohibited, except with
thewritten authorization of Thermo Fisher Scientific Inc.
Thecontents of this document aresubject to changewithout notice. All technical information in this document is for reference
purposes only. System configurations and specifications in this document supersedeall previous information received by the
purchaser.
Thermo Fisher Scientific Inc. makes no representations that this document is complete, accurateor error-free and assumes no
responsibility and will not beliablefor any errors, omissions, damageor loss that might result from any useof this document, even
if theinformation in thedocument is followed properly.
This document is not part of any sales contract between Thermo Fisher Scientific Inc. and apurchaser. This document shall in no
way govern or modify any Terms and Conditions of Sale, which Terms and Conditions of Saleshall govern all conflicting
information between thetwo documents.

1500°C TubeFurnace305435H03 | 1
Tableof Contents
Table of Contents
Chapter 1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Explanation of Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7
Standards and Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
Electromagnetic Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
Chapter 2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Intended Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13
Non-Intended Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
Chapter 3 Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
AtmosphereSystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Chapter 4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17
Lifting and Carrying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17
Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17
ThermocoupleCheck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19
Heating Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-20
TubeAdapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-23
Chapter 5 Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25
Initial FurnaceStart-Up / Drying-Out Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-25
Chapter 6 Main Controller: 5x16 Segment Programmable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-27
Eurotherm 3216 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27
Operator Interface& HOME Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-28
Beacon Display and Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-28
Operator Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-29
SingleSet Point Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-29
AlternateSet Point Selection (SP2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30
Set Point Ramp Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-30
View or ChangetheDisplay Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-31
Auto Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32
Parameter List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-33
Offset Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-35
Alarms & Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-36
Sensor Break & Loop Break Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37
Over-TemperatureProtection (OTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-37
5-Program 16-Segment Controller Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-39
Chapter 7 Main Controller: 25x500 Segment Programmable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45
Eurotherm 3504 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45
Controller Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-45
3504 Controller HOME display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-46
Beacon Display and Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-46

Tableof Contents
2 | 305435H03 MinimiteTubeFurnace
TheOperator Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-47
Shortcut Key Presses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-47
To Select Manual Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-48
Program Segment Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-49
Programmer Types: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-52
To Select and Run aProgram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-54
Steps to Edit theTarget SP and Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-55
To CreateaProgram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-58
To ChangetheAccess level from L1 to L2 (Level 1 to Level 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-60
Auto Tune. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-61
To ChangetheDisplay Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-64
To ChangethePV Offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-65
To ChangetheALARM Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-66
To ChangetheALARM3 and its HYSTERESIS values (Deviation Alarm) . . . . . . . . . . . . . . . . . . . . . . . . .7-68
Chapter 8 Operation - 3216i Over Temperature Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-71
Over Temperaturecontroller Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-72
Operational Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-73
Chapter 9 Communication Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-79
Adapters - RS 485 to RS 232/USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-79
Host Computer & Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-79
3504_Controller Parameters for Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-80
3216_Controller Parameters for Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-80
Chapter 10 Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-81
ThermocoupleReplacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-81
Heating Element Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-83
Control ModuleReplacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-84
Solid- StateRelay Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-85
Control FuseReplacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-86
Heating Element Measuring System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-86
Cleaning and Decontamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-88
Chapter 11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-89
Chapter 12 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-91
Chapter 13 Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-93
Chapter 14 End of Life Care. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-95
WEEE Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-96
Chapter 15 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15-97

1500°C TubeFurnace305435H03 | 3
Figures
Figures
Figure1 Laboratory TubeFurnace............................................................................................................ 2-14
Figure2 Control Wiring ............................................................................................................................ 4-18
Figure3 Thermocouple............................................................................................................................ 4-19
Figure4 Heating Element Installation ........................................................................................................ 4-21
Figure5 Customer Wiring ........................................................................................................................ 4-22
Figure6 Timeto Target Programmer ........................................................................................................ 7-52
Figure7 Ramp RateProgrammer ............................................................................................................. 7-52
Figure8 Graph datawithout Auto tune(Shown examplefor 1500°C Furnaces) ............................................ 7-63
Figure9 Graph datawith Auto tune(Shown examplefor 1500°C Furnaces) ................................................. 7-63
Figure10 ThermocoupleReplacement ................................................................................................... 10-82
Figure11 Heating Element Replacement ................................................................................................ 10-84
Figure12 Control ModuleReplacement .................................................................................................. 10-84
Figure13 Control ................................................................................................................................ 10-85
Figure14 Wiring Diagram STF55433 series ........................................................................................... 12-91
Figure15 Wiring Diagram STF55433P Series ......................................................................................... 12-92

Figures
4 | 305435H03 1500°C TubeFurnace

1500°C TubeFurnace305435H03 | 1-5
Safety Precautions | Chapter 1
Safety Precautions
Explanation of Symbols
This symbol when used aloneindicates important operating instructions which reducethe
risk of injury or poor performanceof theunit.
DANGER : Indicates ahazardous situation which, if not avoided, will result in death
or serious injuries.
WARNING : Indicates ahazardous situation which, if not avoided, could result in
death or serious injuries.
CAUTION : Indicates asituation which, if not avoided, could result in damageto
equipment or property.
Beforeinstalling, using or maintaining this product, pleasebesureto read themanual
and product warning labels carefully. Failureto follow theseinstructions may causethe
product to malfunction, which could result in injury or damage
This symbol indicates possiblepinch points which may causepersonal injury.
This symbol indicates surfaces which may becomehot during useand may causeaburn
if touched with unprotected body parts.
WARNING : This symbol indicates situations wheredangerous voltages exist and
potential for electrical shock is present.
This symbol indicates aneed to usegloves during theindicated procedures.
If performing decontamination procedures, usechemically resistant gloves.
Usegloves during thedaily usage.
WARNING : This symbol indicates asituation which firehazards exits in theProduct.
WARNING : Unauthorized repair of your Furnacewill invalidateyour warranty.
Contact Technical Serviceat 1-800-438-4851 for additional information.

| Safety Precautions
1-6 | 305435H03 1500°C TubeFurnace
Chapter 1
This symbol indicates power is ON.
This symbol indicates power is OFF.
This symbol indicates Alternating current.
This symbol indicates Earth ground power.
This symbol indicates Protectiveconductor terminal.

1500°C TubeFurnace305435H03 | 1-7
Safety Precautions | Chapter 1
Safety Considerations
DANGER :
Usethis product only in theway described in theproduct literatureand in this manual.
Beforeusing it, verify that this product is suitablefor its intended use. If theequipment
is used in amanner not specified by themanufacturer, theprotection provided by the
equipment may beimpaired.
Do not modify or useequipment in amanner other than expressly intended.
Modification of equipment other than that for which it is explicitly designed could cause
severeinjury or death. Any customer after-market retrofit violates thewarranty of the
equipment.
Do not modify or disconnect any safety features provided. Disconnection of theunit
safety features could allow theunit to becomeoverheated and start on fire, causing
personal injury or death, product and property damage.
Do not usecomponents or materials not specifically designed for this equipment.
Failureto comply with this precaution could result in damageto equipment used or the
furnaceand may createan overheat situation. Also, do not useanything other than
OEM exact replacement equipment and parts. Not using OEM replacement parts could
causefaulty instrumentation readings. inoperableequipment or temperatureovershoot.
Both situations may causepersonal injury or death, product, and property damage.
Beforeusing, user shall determinethesuitability and integrity of theproduct for the
intended useand that theunit has not been altered in any way. Misapplication may
compromisethesafety of theend user or thelifeof theproduct.
WARNING : UseappropriatePersonal ProtectiveEquipment (PPE) per local
protocols.
Your unit must beproperly grounded in conformity with national and local electrical
codes. Do not connect theunit to overloaded power sources.
Disconnect theunit from all power sources beforecleaning, troubleshooting, or
performing other maintenanceon theproduct or its controls.
CAUTION : This product contains refractory ceramic fiber or other refractories which
can result in thefollowing:
May beirritating to skin, eyes, and respiratory tract.
May beharmful if inhaled.
May contain or form cristobalite(crystallinesilica) with useat high temperature
(above871°C (1599.8°F)) which can causesevererespiratory disease.
Possiblecancer hazard based on tests with laboratory animals. Animal studies to
dateareinconclusive. No human exposurestudies with this product havebeen
reported.

| Safety Precautions
1-8 | 305435H03 1500°C TubeFurnace
Chapter 1
WARNING : This product can exposeyou to chemicals including arsenic, which is
known to thestateof Californiato causecancer. For moreinformation go to
www.P65Warnings.ca.gov.
WARNING : Beforemaintaining this equipment, read theapplicableSDS (Safety
DataSheets). SDS is provided with unit.
WARNING : When installing, maintaining or removing thefiberglass insulation, the
following precautions will minimizeairbornedust and fiber:
Keep personnel not involved in theinstallation out of thearea.
Useagood vacuum to clean area and equipment. Useadust suppressant if
sweeping is necessary. Do not usecompressed air.
Useadisposablemask suitablefor nuisancedust.
Wear long sleeveclothing, gloves, hat and eyeprotection to minimizeskin and
eyecontact. Do not wear contact lenses.
Thoroughly wash self after work is complete.
Launder work clothing separatefrom other clothes and thoroughly clean
laundering equipment after use. If clothing contains alargeamount of dust and/or
fiber, disposeof rather than clean.
Promptly placeused ceramic fiber parts and dust in plastic bags and disposeof
properly.

1500°C TubeFurnace305435H03 | 1-9
Safety Precautions | Chapter 1
Standards and Directives
Thetubefurnaces complies with thefollowing standards and guidelines:
European Union
TheEuropean voltagemodels of this product meet all theapplicable
requirements of theEuropean Directives and thereforedisplay theCE
Marking. Themost current EU Declaration of Conformity may beobtained
from themanufacturer.
Product Safety
This product family has been tested to applicableproduct standards by UL aNationally
Recognized Test Laboratory (NRTL).
Electromagnetic Compatibility
FCC Statement (USA)
Any changes or modifications not expressly approved by theparty
responsiblefor compliancecould void theuser’s authority to operatethe
equipment.
NOTE: This equipment has been tested and found to comply with thelimits for aClass A
digital device, pursuant to part 15 of theFCC Rules. Theselimits aredesigned to provide
reasonableprotection against harmful interferencewhen theequipment is operated in a
commercial environment. This equipment generates, uses, and can radiateradio
frequency energy and if not installed and used in accordancewith theinstruction manual,
may causeharmful interferenceto radio communications. Operation of this equipment in
aresidential area is likely to causeharmful interferencein which casetheuser will be
required to correct theinterferenceat his own expense.
Canadian ISED IC Notice
This ISM digital apparatus complies with Canadian ICES-001.
Cet appareil ISM est conformeá lanormeNMB-001 du Canada.

| Safety Precautions
1-10 | 305435H03 1500°C TubeFurnace
Chapter 1
South Korean EMC Statement
사용자안내문이기기는업무용환경에서사용할목적으로적합성평가를받
은기기로 서가정용환경에서사용하는경우전파간섭의우려가있습니다 .
EMC Registration is doneon this equipment for business useonly. It may cause
interferencewhen theproduct would beused in home.
Evaluation of Chemicals - Regulations and
Directives
Proposition 65 - California
REACH - Europe
Thermo Fisher Scientific is committed to meeting all complianceobligations to evaluate,
communicateand register any Substances of Very High Concern (SVHC) and finding
alternates whereappropriate.
RoHS - Europe
Thermo Fisher Scientific is determined to reducetheimpact on theenvironment and so
can declarethat this product fully complies with theEuropean Parliament’s RoHS2
(Restriction of Hazardous Substances) Directive2011/65/EU, with respect to all the
following substances:
Lead (0.1%)
Mercury (0.1%)
Cadmium (0.01%)
Hexavalent chromium (0.1%)
Polybrominated biphenyls (PBB) (0.1%)
Polybrominated diphenyl ethers (PBDE) (0.1%)
Our complianceis witnessed by written declaration from our suppliers and/or component
testing. This confirms that any potential tracecontamination levels of thesubstances
listed aboveor below themaximum level set by thelatest regulations areexempt dueto
their application.
WARNING : Cancer and ReproductiveHarm - www.P65Warnings.ca.gov

1500°C TubeFurnace305435H03 | 1-11
Safety Precautions | Chapter 1
RoHS – China
This product complies with therequirements of thelegislativeact Administration on the
Control of Pollution Caused by Electronic Information Products (ACPEIP). Thefollowing
label of conformance, may befound on theproduct:

| Safety Precautions
1-12 | 305435H03 1500°C TubeFurnace
Chapter 1

1500°C TubeFurnace305435H03 | 2-13
Introduction | Chapter 2
Introduction
Thermo Fisher Scientific STF55433 is areliable, energy efficient 1500°C laboratory tube
furnacedesigned for years of dependablelaboratory service. TheSilicon Carbideheating
elements and low thermal mass Moldatherm®insulation providefast duty cycles, energy
conservation, and efficient programming. Refer to Table1 “Thermo Fisher Scientific
STF55433 Series TubeFurnaces” for specifications.
Features and Benefits
Controlled heat-up rateeliminates thermal shock to materials.
Quick heat-up and cool-down rates.
Energy efficient Moldatherm insulation suitablefor high interior-exterior temperature
differential. Theunit is rated for amaximum operating temperatureof 1500°C.
Main power ON/OFF switch on control panel and act as disconnecting devicefrom
Mains Power.
Digital instrumentation for precisetemperaturesetpoint and display. Microprocessor
automatically optimizes control parameters during furnaceoperation.
Three sizes of tubeadapters availableto accommodate1 in., 2 in., and 3 in. outside
diameter process tubes.
Doublewall construction.
Front control panel is recessed at thetop. This featureprovides easy viewing of the
control LED and protection for thecontrol instrumentation.
Intended Use
This furnaceis intended as ageneral purposelaboratory, ashing and heat treating furnace
at 1500°C for continuous (over 3 hours) or intermittent (under 3 hours) use, for industrial,
laboratory and commercial applications only. Thefurnaceis designed for thermal
technology applications in laboratories, such as thosefound in manufacturing trades and
industry, schools, universities and biology. It is used for ageing, analysis, tempering,
decomposing, baking, annealing, hardening, soldering, oxidizing, reducing, incineration
and preheating.
This tubefurnaceis suited for usewith process tubes with 1in.,2 in., and 3 in. OD
diameter, e.g. for heating under inert gas atmosphere. Please note that tubes
are not provided by Thermo Fisher Scientific.

| Introduction
2-14 | 305435H03 1500°C TubeFurnace
Chapter 2
Non-Intended Use
This furnaceis not intended for thefollowing:
To heat up food.
For drying or heat treatment of substances which releasegases or vapors into the
atmospherethat areflammableor dangerously explosivewhen mixed with air.
This furnaceis equally unsuitablefor theheat treatment of combustibledusts and
fibrous materials.
Specifications
Figure 1 Laboratory Tube Furnace
Table 1 Thermo Fisher Scientific STF55433 Series Tube Furnaces
*COM = Unit includes maleand femaleRS 485 Digital Communications DB-9 ports.
Model STF55433BC-1
STF55433BCOMC-1*
STF55433PBC-1
STF55433PBCOMC-1*
Heating Zone30.5 cm (12 in) 30.5 cm (12 in)
Temp. Range100°C to 1500°C 100°C to 1500°C
Process tubediameter 2.5-7.5 cm (1-3 in.) 2.5-7.5 cm (1-3 in.)
Overall
(L x W x H)
48.3 x 58.4 x 43.2 cm
(19 x 23 x 17 in)
48.3 x 58.4 x 43.2 cm
(19 x 23 x 17 in)
Main Control 3216p 3504
Over Temp controller 3216i 3216i
Electrical 208/240 V
50/60 HZ
25 A
208/240 V
50/60 HZ
25 A
Shipping Weight 123 kg
(270 Lb.)
123 kg
(270 Lb.)
3216p = 1/16 DIN, 5 program 16 segment digital dual display controller.
3504 = 1/4 DIN, 25 program 500 segment digital dual display controller.
3216i = 1/16 DIN, Over temperaturedigital dual display controller.

1500°C TubeFurnace305435H03 | 3-15
Pre-Installation | Chapter 3
Pre-Installation
Unpacking
Carefully unpack and inspect theunit and all accessories for damage. If you find any
damage, keep thepacking materials and immediately report thedamageto thecarrier.
Wewill assist you with your claim, if requested. Do not return goods to Thermo
Fisher Scientific without written authorization. When submitting aclaim
for shipping damage, request that thecarrier inspect theshipping container and
equipment.
Insidethefurnacecabinet is abag containing:
User Manual, SDS, User Information Instructions*
Heating elements, Elements straps, Element Terminal Clamp, Element Clamp Tool &
Bag of AluminaSilicaFibre.
Tubeadapters
Operating Conditions
High concentrations of sulfates, chlorides, fluorides, alkalis and V2O5can havecorrosive
effects on theceramic fiber. Contact Thermo Scientific for additional information about the
effects of specific atmospheres on furnaceperformance.
With prolonged use, hairlinecracks can develop in theinsulation materials. Theseminor
cracks will not affect thefurnace's performance. Werecommend turning off thefurnace
completely when not in use. Theheating unit is not damaged by rapid heating and cooling
cycles.
Environmental Conditions
*NOTE May becontained on optional USB thumb drive.
Indoor UseOnly.
Class of Equipment Class I
Mains Supply
Fluctuations
Mains supply voltagefluctuations not to exceed ±10% of
thenominal voltage.
Operating Therecommended ambient temperatureis 17°C to 27°C
(62.6°F to 80.6°F); 20% to 80% relativehumidity, non-con-
densing.
Installation Category II (over-voltage) in accordancewith IEC
664. Pollution degree 2 in accordancewith IEC 664. Do not
exceed ambient temperatureof 40°C (104°F).
AltitudeLimit 2,000 meters (6561.68 feet).
Storage-25°C (-13°F) to 65°C (149°F); 20% to 80% relative
humidity.

| Pre-Installation
3-16 | 305435H03 1500°C TubeFurnace
Chapter 3
Atmosphere Systems
TheSTF55433 Series tubefurnaces aredesigned for usewith combustibleor inert
atmospheres when contained in aprocess tube.
WARNING : Do not usecombustiblegases directly in this furnace. Process gasses
must always becontained in aseparatetube.
CAUTION : Avoid combustibleproducts which generatetoxic or hazardous vapor or
fumes. Work should only bedonein aproperly vented environment.
NOTE Thermo Fisher Scientific tubefurnacemust beused with process tubes. Do not
operatethefurnacewithout an appropriately installed customer supplied process tube
or other customers supplied vessel.

1500°C TubeFurnace305435H03 | 4-17
Installation | Chapter 4
Installation
Lifting and Carrying
Transport
1. For transport, do not lift thedeviceusing installed components (e.g. tubeadapter or
process tube) as lifting points.
2. Lift at thebottom sides of thefurnacewith NIOSH rated straps and/or using
appropriatenumber of personnel per local safety policies and regulations.
Location
Install thefurnacein alevel area free from vibration. To permit proper air flow, leaveat
least 12"(30.48 cm) of spaceon all sides of theunit and 12"(30.48 cm) abovetheunit.
Wiring
For detailed wiring information, refer to:
Figure13 “Wiring Diagram STF55433 series”
Figure14 “Wiring Diagram STF55433P Series” at theend of this manual.
CAUTION : Besureambient temperaturedoes not exceed 40°C (104°F). Ambient
abovethis level may result in damageto thecontroller. Therecommended ambient
temperatureis 17°C to 27°C (62.6°F to 80.6°F).
CAUTION : Allow at least 12"(30.48 cm) of spacebetween thefurnace, at least
12"(30.48 cm) abovethefurnaceand any combustiblesurface. This permits theheat
from thefurnacecaseto escapeso as not to createapossiblefirehazard.
WARNING : To avoid electrical shock, this furnacemust beinstalled by acompetent
electrician who ensures compatibility among furnacespecification, power sourceand
ground coderequirements.
CAUTION :
Heavy loads. Lift with care!
1. To avoid injury through physical strain, such as strain traumaand slipped discs, do
not attempt to lift thefurnacealone.
2. To avoid injury through dropped loads, wear Personal ProtectiveEquipment (PPE)
per local protocols, such as safety shoes, when lifting thefurnace.
3. To avoid crushing your fingers or hands or damaging thefurnace, do not useany
other lift points than thebottom sides of thefurnace.
NOTE Thefurnaceand control arewired and bolted together at thefactory. The
control must bewired to apower sourcebeforeoperation (refer to Section “240 VAC
Operation”).

| Installation
4-18 | 305435H03 1500°C Tube Furnace
Chapter 4
Figure 2 Control Wiring
240 VAC Operation
The STF55433 models are 240 VAC furnaces. Power and ground wires are not provided
with these furnaces. Note that the heating elements also must be installed (Refer to
Section “Heating Elements”).
1. Determine the length of wire needed to connect the furnace to the power source.
Furnace installation requires two power wires and one ground wire. Refer to below
Table for minimum recommended wire gauge sizes.
2. Label the power wires Line1 and Line2 and label the ground wire Ground.
3. Swing the control back panel down to the horizontal position (refer to Figure 2
“Control Wiring”). Use of flexible or rigid conduit and necessary fitting per local
electrical codes are recommended.
4. Thread the Line, Neutral, and Ground wires through the 7/8 in. knock-out in the
bottom rear panel. Use a screwdriver to insure proper placement of the appropriate
wires to the terminal.
5. Check that all electrical connection are secure.
6. Replace the control back panel.
7. Connect into a 240 VAC, grounded line. The furnace draws approximately
26.6 amps at 240 VAC.
Ground
Connected
Solid State
Relay
NOTE For Europe, L2 connection at furnace is wired to Neutral.
NOTE Electrical installation must be performed by a qualified electrician.
Consult local electrical codes for proper sizing of power and control wiring.
Wire Screw Wire Gauge
Line L1 10AWG
Neutral L2 10AWG
Ground GND 10AWG