Thomas Scientific 5300A20/F48025-TS, 5300A25/F48025-80-TS Operation Manual And Parts List
Muffle Furnace
OPERATION MANUAL
AND PARTS LIST
Series 1285
Model Voltage Control Display
5300A20/F48025-TS 120V Single Setpoint Model °C
5300A25/F48025-80-TS 120V 8 Setpoint Programmable Model °C
LT1285X5 • 5/12/09
with OTP
with OTP
Table of Contents
Safety Information ..............................................................................................................................................3
Alert Signals..................................................................................................................................................3
Warnings ......................................................................................................................................................3
Introduction..........................................................................................................................................................5
Intended Use ................................................................................................................................................5
General Usage..............................................................................................................................................5
Principles of Operation ................................................................................................................................5
General Specifications ........................................................................................................................................6
Models 5300A20/F48025-TS and 5300A25/F48025-80-TS ........................................................................6
Environmental Conditions ............................................................................................................................7
Unpacking ..........................................................................................................................................................8
Installation ..........................................................................................................................................................9
Site Selection................................................................................................................................................9
Electrical Connections ..................................................................................................................................9
Operation, All Models ........................................................................................................................................10
Power Switch ..............................................................................................................................................10
Cycle Light ..................................................................................................................................................10
Door Safety Switch ....................................................................................................................................10
Single Setpoint Model with OTP ......................................................................................................................11
Single Ramp & Dwell ........................................................................................................................................15
8 Segment Programmable Models with OTP....................................................................................................17
Furnace Loading ..............................................................................................................................................31
Preventative Maintenance ................................................................................................................................32
General Cleaning Instructions ....................................................................................................................32
Troubleshooting ................................................................................................................................................33
Maintenance and Servicing ..............................................................................................................................35
To Replace a Heating Element ..................................................................................................................35
To Replace a Chromel/Alumel Thermocouple ............................................................................................36
To Replace Door Switches (Micro-Switch) ................................................................................................37
To Realign Door Switches (Micro-Switch) ..................................................................................................37
To Replace the Controller ..........................................................................................................................38
Replacement Parts............................................................................................................................................39
Single Setpoint Models with OTP ..............................................................................................................39
8 Segment Programmable Models with OTP ............................................................................................39
Ordering Procedures ..................................................................................................................................39
Wiring Diagrams................................................................................................................................................40
Warranty Repair and Service ............................................................................................................................44
2
Alert Signals
Warning
Warnings alert you to a possibility of personal injury.
Caution
Cautions alert you to a possibility of
damage to the equipment.
Note
Notes alert you to pertinent facts and
conditions.
Safety Information
This manual contains important operating and safety information. You must carefully read and understand the contents of this manual prior to the use of this furnace.
Your Thomas Scientific 5300A20/F48025-TS or
5300A25/F48025-80-TS Muffle Furnace has been
designed with function, reliability and safety in mind. It is
your responsibility to install it in conformance with local
electrical codes. For safe operation, please pay attention to
the alert signals throughout the manual.
Warnings
To avoid electrical shock, this furnace must:
1. Use a properly grounded electrical outlet of correct voltage and current handling capacity.
2. Be disconnected from the power supply prior to
maintenance and servicing.
Hot Surface
Hot surfaces alert you to a possibility of
personal injury if you come in contact
with a surface during use or for a period
of time after use.
3. Have the door switch operating properly.
To avoid personal injury:
1. Do not use in the presence of flammable or combustible materials; fire or explosion may result.
This device contains components which may
ignite such material.
2. Caution: Hot Surface - Avoid Contact. To avoid
burns, do not touch the exterior or interior surfaces of this furnace during use or for a period of
time after use.
3. Always wear safety glasses or a safety shield and
high temperature gloves when loading or unloading the furnace. Long sleeved, fire retardant clothing and a fire retardant apron is also recommended.
4. Refer servicing to qualified personnel.
3
SAFETY INFORMATION
Warning
Refer servicing to qualified personnel.
Warning
This warning is presented for compliance with California
Proposition 65 and other regulatory agencies and only applies
to the insulation in this product. This product contains refractory ceramic, refractory ceramic fiber or fiberglass insulation,
which can produce respirable dust or fibers during disassembly. Dust or fibers can cause irritation and can aggravate preexisting respiratory diseases. Refractory ceramic and refractory
ceramic fibers (after reaching 1000°C) contain crystalline silica,
which can cause lung damage (silicosis). The International
Agency for Research on Cancer (IARC) has classified refractory ceramic fiber and fiberglass as possibly carcinogenic (Group
2B), and crystalline silica as carcinogenic to humans (Group 1).
The insulating materials can be located in the door, the hearth
collar, in the chamber of the product or under the hot plate top.
Tests performed by the manufacturer indicate that there is no
risk of exposure to dust or respirable fibers resulting from operation of this product under normal conditions. However, there
may be a risk of exposure to respirable dust or fibers when
repairing or maintaining the insulating materials, or when otherwise disturbing them in a manner which causes release of dust
or fibers. By using proper handling procedures and protective
equipment you can work safely with these insulating materials
and minimize any exposure. Refer to the appropriate Material
Safety Data Sheets (MSDS) for information regarding proper
handling and recommended protective equipment. For additional MSDS copies, or additional information concerning the
handling of refractory ceramic products, please contact the
Customer Service Department at Thomas Scientific at 1-800345-2100.
4
Caution
Do not exceed operating temperatures
shown in “General Specifications.”
Exceeding these limits will result in
severely reduced element life.
Introduction
Intended Use
The 5300A20/F48025-TS or 5300A25/F48025-80-TS
furnace is a general purpose laboratory and heat treating furnace. For optimum element life, Thomas
Scientific recommends observing these temperature
ranges: from 100°C (212°F) to 1093°C (2000°F) continuous use or from 1093°C (2000°F) to 1200C (2192°F)
for intermittent use. Continuous use is operating the
furnace for more than 3 hours and intermittent use is
operating the furnace for less than 3 hours.
All furnaces consist of: 1) a vented heating chamber;
2) a temperature controller; and 3) a door safety switch
for operator safety.
General Usage
Do not use this product for anything other than its
intended usage.
Principles of Operation
The furnace chamber is heated by open coil electric
resistance elements and is insulated with ceramic fiber
insulation. The controller is located under the furnace
chamber and is well insulated from the heat generated
in the furnace chamber. A door safety switch removes
power to the heating elements whenever the furnace
door is opened. The temperature is controlled by one
of three types of controllers.
5
General Specifications
Models 5300A20/F48025-TS and 5300A25/F48025-80-TS
Dimensions in Inches (cm):
Chamber: 7 (17.8) W x 5 (12.7) H x 10 (25.4) D
Overall: 13.25 (33.7) W x 19 (48.3) H x 19.5 (49.5) D
Weight: 56 lb. (25.4 kg)
Electrical Ratings:
Volts: 120
Amps: 14.5
Watts: 1800
Frequency: 50/60
Phase: 1
Temperature:
Operating Range: 2000°F (1093°C) continuous
2192°F (1200°C) intermittent
6
GENERAL SPECIFICATIONS
Environmental Conditions
Operating: 17°C to 27°C; 20% to 80% relative humidity, non-condensing. Installation Category II
(overvoltage) in accordance with IEC 664. Pollution degree 2 in accordance with IEC 664.
Altitude Limit: 2,000 meters.
Storage: -25°C to 65°C; 20% to 80% relative humidity
7
Unpacking
1. Visually check for any physical damage
to the shipping container.
2. Inspect the equipment surfaces that are
adjacent to any damaged area.
3. Open the furnace door and remove the
packing material from inside the furnace
chamber.
4. Vacuum the chamber prior to use to
remove the insulation dust due to shipment. (The 5300A20/F48025-TS and
5300A25/F48025-80-TS furnaces are
supplied with one ceramic shelf.)
5. Retain the original packaging material if
reshipment is foreseen or required.
8
Caution
Be sure ambient temperature does not
exceed 40°C (104°F). The recommended
ambient temperature is 17°C - 27°C.
Ambients above this level may result in
damage to the controller.
Caution
Allow at least six inches of space
between the furnace and any combustible
surface. This permits the heat from the
furnace case to escape so as not to create a possible fire hazard.
Installation
Site Selection
Install furnace on a sturdy surface and allow adequate
space for ventilation.
Electrical Connections
The electrical ratings are located on the specification
plate on the back of the furnace. Consult Thomas
Scientific if your electrical service is different than
those listed on the specification plate. Be sure the front
power switch is in the OFF position before connecting
the furnace to your electrical supply.The
5300A20/F48025-TS or 5300A25/F48025-80-TS furnaces are supplied with a power cord rated at 120V,
15 amps.
Warning
To avoid electrical shock, this furnace
must always use a properly grounded
outlet of correct voltage and current handling capacity.
9
Operation, All Models
Warning
To avoid personal injury do not use in the
presence of flammable or combustible
chemicals; fire or explosion may result.
This device contains components which
may ignite such materials.
Hot Surface
Caution: Avoid Contact. To avoid burns,
this furnace must not be touched on the
exterior or interior surfaces during use or
for a period of time after use.
Warning
Always wear safety glasses or a safety
shield and high temperature gloves when
loading or unloading the furnace. Long
sleeved, fire retardant clothing and a fire
retardant apron is also recommended.
Power Switch
Both the ON/OFF power switch and the digital display
will illuminate when power is switched ON. The furnace will begin to heat to its controller's current setpoint. (See the instructions for your type of controller
for information on checking and setting the setpoint.)
Cycle Light
The amber cycle light will illuminate whenever the
power is being applied to the heating elements. The
cycle light will turn on and off as the furnace reaches
the setpoint.
Door Safety Switch
The door safety switch removes power from the heating elements when the door is opened. Open and
close the door a few times; note that the amber
CYCLE light will switch off when the door is opened.
If this condition is not true, consult the
Troubleshooting section before proceeding. This
check must be done when the furnace is heating and
the cycle light is illuminated.
Warning
To avoid electrical shock, the door safety
switch must be operating properly.
10
Single Setpoint Model w/OTP
Output 1
Manual
AN
M
PAGE
Button
Single Setpoint Models
SCROLL
Button
Output 2
DOWN ARROW
Button
Temperature
Display
Display
Window
UP ARROW
Button
The single setpoint model w/ OTP furnace controller is a single setpoint controller which provides a
single digital display to indicate the current chamber
temperature or setpoint temperature. This temperature controller features sensor break protection, selftuning capability and over temperature protection
(OTP) with an additional OTP relay device.
Basic Operation
When the controller is turned ON it will perform a
short self-test and then display the measured value
(process value) in the HOME DISPLAY.
Buttons and Indicators
OP1 (Output 1): Illuminates when the logic output is
ON.
OP2 (Output 2): Illuminates when the relay output is
ON (will go out during an alarm situation).
PAGE button: Allows you to select a new list of
parameters.
Note
If at any time you want to return to the
HOME DISPLAY, simultaneously press
the PAGE and SCROLL buttons.
SCROLL button: Allows you to select a parameter
within a list of parameters.
DOWN button: Allows you to decrease a value.
UP button: Allows you to increase a value.
To View or Change the
Setpoint
To view the setpoint, press and release the UP or
DOWN buttons. If you want to change the setpoint,
continue pressing until the desired setpoint value is
displayed and then release the button. A few seconds
after the button is released, the controller will accept
the new value and revert to the HOME DISPLAY.
11
SINGLE SETPOINT MODEL W/OTP
To View the Display Units
From the HOME DISPLAY press the SCROLL button. The
display will show the temperature units in °C/F/K and then
return to the HOME DISPLAY. (Call Customer Service if you
require a different temperature unit.)
To View the % Output Power
From the HOME DISPLAY press the SCROLL button twice.
Press and release the UP or DOWN button to view the %
output power. This value is a read-only value and cannot be
changed.
Controller Parameters
Home display
°C: Temperature units in Celsius. Temperature units can not
be changed without entering the configuration. Contact
Customer Service if a different temperature unit is required.
OP: % output power demand.
IdHi: Deviation high alarm. Factory preset to 50.
AL List (Alarm List)
IdHi: Deviation high alarm. Factory preset to 50.
3FSL: Full scale low alarm. Factory preset to -99°C.
Cannot be adjusted by end users.
Atun List (Autotune List)
tunE: One-shot autotune enable.
Pid List (Proportional, Integral, Derivative)
Pb: Proportional band (in display units). Factory preset to 5.
12
ti: Integral time in seconds. Factory preset to 0.48.
td: Derivative time in seconds. Factory preset to 0.8.
ACCS List Code: Access code (Code needed to enter or
change the other configuration parameters which are not
normally accessible.) Not accessible.
SINGLE SETPOINT MODEL W/OTP
Note
The following alarm messages are factory default settings and may vary if you
have changed the configuration of your
controller:
IDHi: = 50°C
2FSH = 1225°C
Alarms
The controller will flash an alarm message in the home
display if an alarm condition is detected.
2FSH: Measured value full scale high alarm. The full
scale high alarm is for furnace protection. It cannot be
accessed from the user list.
IdHi: Measured value deviation high alarm. The deviation alarm is factory preset at 50°C. If the chamber temperature rises to 50°C above the setpoint temperature,
this error condition will alert end users. The furnace will
continue to control temperature at the alarm setpoint,
which was defined as 50°C above the setpoint. End
users must power off the furnace and contact Customer
Service for troubleshooting assistance. Do not reset this
alarm below 20°C at any time.
S.br: Sensor Break: check that sensor is connected correctly.
L.br: Loop Break: check that the heating circuits are
working properly.
Ld.F: Heater Circuit Fault: indication of either an open or
short solid sate relay, a blown fuse, missing supply or
open circuit heater.
Sensor Break Protection
This controller provides sensor break protection in the
event the thermocouple opens. If an open thermocouple
condition occurs, the digital display will blink “S.br” and
the power to the heating element will be shut OFF (Cycle
light will extinguish).
Over-Temperature Protection
(OTP)
The OTP will be in effect during any alarm condition
when the temperature of the furnace has deviated
beyond the limit. The “Deviation High” alarm is the only
alarm value which can be changed. To change it, press
the SCROLL button until “IdHi” appears on the display.
13
SINGLE SETPOINT MODEL W/OTP
Note
Furnace must be at ambient
temperature before starting a tune.
Press the UP or DOWN button to select the OTP value
you desire. We recommend a value of 20° above your
working temperature to provide protection for your
workload.
In addition to over-temperature protection, units containing a single setpoint controller w/OTP feature a
mechanical OTP relay device which disconnects power
from the elements in an alarm condition (only in furnaces with OTP relay).
Tuning
This controller incorporates a self-tuning feature which
determines the optimum control parameters for the
best temperature accuracy with your load and setpoint.
Use this feature the first time you use your furnace and
each time you change either your setpoint or the type
of load you are heating. Thomas Scientific recommends you use this feature to provide the best temperature accuracy the controller can attain. To use the tuning feature:
1. Adjust the setpoint to your desired value.
14
Note
“Stat” and “Sp.rr” in Sp list must be
set to OFF or “tunE” will not initiate.
Note
Tune has completed when “tunE”
stops flashing on display.
2. Press the PAGE button until display reads,
“Atun.”
3. Press the SCROLL button. Display will read,
“tunE.”
4. Press the UP or DOWN button to select, “on.”
5. Simultaneously press the PAGE and
SCROLL buttons to return to the HOME DISPLAY. The display will alternately flash
between “tunE” and the HOME DISPLAY
while tuning is in progress.
6. The controller will then turn the heating on
and off to induce an oscillation. When the
measured value reaches the required setpoint
the first cycle will end.
7. Tuning will be complete after two oscillation
cycles and then the tuner will turn itself off.
8. Normal control function will resume after the
controller calculates tuning parameters.
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