Cole Parmer 650 Series User manual

Programmable Muffle Furnace
Instruction Manual
650-750 Series
625 East Bunker Court
Vernon Hills, IL 60061-9872
1-847-549-7600
1-800-323-4340
www.coleparmer.com

Table of Contents Programmable Muffle Furnaces
Introduction........................................................................................................................ 1
Installation.......................................................................................................................... 2
Selecting a Location........................................................................................................................ 2
Unpacking ....................................................................................................................................... 2
Preparing the Furnace ..................................................................................................................... 3
Figure 1-Furnace Layout................................................................................................... 4
Controls.............................................................................................................................. 5
Displays........................................................................................................................................... 5
Keypads........................................................................................................................................... 5
Circulating Fan (Model 750 only)................................................................................................... 6
Operation............................................................................................................................ 7
Control Mode .................................................................................................................................. 7
Ramp and Soak Mode ..................................................................................................................... 8
Creating a Ramp and Soak Program ............................................................................................... 9
Running, Stopping or Resuming a Program ................................................................................. 12
Viewing Program Status ............................................................................................................... 13
An Example Program.................................................................................................................... 14
High Temp Alarm............................................................................................................. 16
Open Thermocouple........................................................................................................ 16
Calibration........................................................................................................................ 16
Units ................................................................................................................................. 17
Power Failure...................................................................................................................17
Data Logging....................................................................................................................17
Trouble Shooting Table................................................................................................... 18
Service.............................................................................................................................. 19
Replacing a Heater ........................................................................................................................ 19
Replacing the Control Thermocouple ........................................................................................... 20
Replacing the Solid State Relay.................................................................................................... 20
Replacing the Magnetic (Safety) Relay ........................................................................................ 21
Replacement Parts .......................................................................................................... 22
Accessories and Supplies .............................................................................................. 23
Performance Characteristics.......................................................................................... 24
Specifications ..................................................................................................................25
Wiring Diagram ................................................................................................................ 26

Page 1 Programmable Muffle Furnaces
Introduction
Cole-Parmer 650/750 Series Programmable Muffle Furnaces are
available in three sizes: small (Model 14), medium (Model 58) and large
(Model 126). All models provide PID microprocessor temperature control
at operating temperatures from 50 to 1125 °C (90 to 2057 °F).
Furnace chambers are molded from alumina silicate ceramic fibers. Use of
this material provides low thermal mass for fast heat-up and cool-down, as
well as an unusually low exterior furnace temperature for safe operation.
The furnace is heated by electric resistance elements embedded in easily
removable side and base panels. The heating elements are designed to
ensure extended service life, even in atmospheres characteristic of high-
sulfur coal and coke samples.
Temperature readouts and control parameters are shown on two red 7-
segment displays. Two LED's indicate when heater power is being
applied or when an over-temperature error condition is encountered.
Temperatures can be displayed in either °C or °F.
These furnaces incorporate a variety of safety features. When the furnace
door is opened, power is automatically cut to the chamber heating
elements. The heater power is also cut out when the chamber temperature
exceeds the set temperature by 25°C (45°F) or more. The alarm condition
is indicated on the display while the alarm LED is lit. A ventilated base
design prevents damage to the bench or countertop.
The system microprocessor permits the user to customize a heating pro-
gram of up to 24 ramp and soak steps. The Model 750 can store 4, 24 step
programs, while the Model 650 can store one 24 step program. If desired,
a soak period of up to 23 hours, 59 minutes and 59 seconds may be
interspersed between any two successive ramps.

Page 2
Programmable Muffle Furnaces
Installation
Selecting a
Location
Unpacking
Choose a location for the furnace, which will provide an area of
approximately four square feet (2 ft x 2 ft). The bench or table selected
must be capable of supporting at least 60lbs for the Model 14, 90lbs for
the Model 58 or 110lbs for the Model 126. Appropriate electrical power
must be available. Locate the furnace within three feet of the power outlet
so that no extension cord is required.
CAUTION: Do not install closer than 6 inches to a wall of
combustible material.
It is recommended that the site have facilities for venting an accessory
Exhaust Tube Assembly which is available for use with the furnace.
Alternatively, the furnace may be located in a fume-hood if samples are
expected to produce toxic volatiles. Call Technical Services for more
information.
Cole-Parmer Muffle Furnaces are shipped in a single carton. After
unpacking, locate each item shown in the list below. Report any missing
items, by name and part number, to your Cole-Parmer branch or
representative. In the event of shipping damage, retain the carton and
packing material and file a claim with the final carrier.
Item
Furnace Assembly
Model 14 Model 14A
120 V, 50/60 Hz 208/240V, 50/60 Hz
Model 58
208/240 V, 50/60 Hz
Model 126
208/240 V, 50/60 Hz
Hearth Plate
Shelf (Model 126 Only)
Instruction Manual
Warranty Card

Page 3 Programmable Muffle Furnaces
Preparing the
Furnace
Special
Precautions
To prepare the muffle furnace for operation, perform the following
procedures:
1. Make certain all packing material is removed from furnace chamber.
2. Place hearth plate on the bottom of the chamber. Orient hearth plate
such that smooth surface faces upward. See Fig. 1, Page 4.
3. With the Model 126, the supplied shelf may be used. If desired, install
shelf by sliding it onto top of ledge protruding from each side of the
inner chamber walls.
4. If installing the accessory Exhaust Tube Assembly, first locate exhaust
port at top of furnace (see Fig 1, Page 4). Use three screws to secure
the port flange to the exhaust port. Attach tubing to port flange
using a hose clamp (provided). Finally, route free end of tube to
fumehood or other outside vent. If desired, exhaust tube may be cut to
length using a hacksaw.
These Muffle Furnace chambers contain alumina silicate ceramic
fibers. With continued use at temperatures above 1000 °C (1832
°F), these materials slowly convert to crystalline silica (cristobalite).
Long-term exposure to airborne cristobalite may result in severe
respiratory diseases in humans. Tests with laboratory animals
suggest that cristobalite is a possible carcinogen. Short-term effects
may include irritation to skin, eyes and the respiratory tract. Please
consult the Material Safety Data Sheet (MSDS) provided by Cole-
Parmer for further information.
This unit is not explosion proof. Do not use in the presence of
flammable or combustible materials; fire or explosion may result.
Unit contains components that may ignite such materials. Before
operating the furnace, always observe the following Safety
Precautions;
•Wear insulating gloves.
•Use tongs.
•Use Safety goggles.
•Never stand in front of an open furnace.

Page 4
Programmable Muffle Furnaces
Air In
3
2
4
19
8
56
7
10
11
Hearth Plate
Thermocouple
Exhaust Port
12
Figure 1-Furnace Layout
1Circulating Fan Switch (Model 750) 7 Program Run Key
2Heater LED 8 Set Temp Display
3Menu Key 9 Alarm LED
4Increase Key 10 Actual Temp Display
5Decrease Key 11 Power Switch
6Program Run LED 12 Door Switch
NOTE: The air in port is closed for Model 650 Furnaces.
See the following pages for keypad/display descriptions.

Page 5 Programmable Muffle Furnaces
Controls
Displays
Keypads
The following sections briefly describe the locations and functions
of various display fields and keypad controls. More detailed
descriptions are provided, when required, in the operating sections
of the manual.
The 650/750 Series controller features two bright, one-half inch LED
numeric displays used in setting up the furnace program or reading out the
furnace temperature. Two smaller LED's indicate, respectively, an alarm
condition or when power is being applied to the furnace heaters. Each
display field is discussed separately below.
Set Display In the Control and Ramp and Soak modes, shows the
furnace set temperature. During setup and
programming, indicates control parameters to be
set.
Actual Display In the Control and Ramp and Soak modes, shows
the actual furnace temperature. During setup and
programming, indicates the numerical value assigned
to the currently displayed control parameter.
Heat LED Lights when controller is calling for heat.
Alarm LED Lights if the actual furnace temperature exceeds the
set temperature by 25°C (45°F).
Run LED Lights when the furnace is running a ramp/soak
Program.
The 650/750 Series incorporates a four-key, tactile keypad. The
function of each key is discussed individually below. See Fig. 1
above for keypad locations.
MENU During programming or setup, successively pressing
the MENU key causes the controller display to
sequentially step through menu selections.
In Control mode, pressing the UP Arrow key,
increases the furnace set temperature, as indicated on
the Set display. During programming or setup, used to
step through menu options.
In Control mode, pressing Down Arrow key,
decreases the furnace set temperature, as indicated on
the Set display. During programming or setup, used
to step through menu options.
RUN Pressing the RUN key alternates muffle furnace
operation between the Control and Ramp and Soak
modes.

Page 6
Programmable Muffle Furnaces
Circulating Fan
(Model 750 only)
Just above and to the left of the Actual Display is the
power switch for the Circulating Fan. When turned
on, outside air is circulated through the bottom of the
furnace chamber under the hearth, were it is heated,
and into the furnace chamber. Two to four air
changes per hour can be expected with the fan on.

Page 7 Programmable Muffle Furnaces
Operation
Safety
Considerations
Control Mode
When operating the muffle furnace, always observe the following safety
precautions:
•Wear insulated gloves.
•Use tongs.
•Never stand in front of an open furnace.
•Use the supplied hearth plate on the chamber bottom.
•Use safety goggles.
The 650/750 Muffle Furnaces feature two modes of operation:
• Control
• Ramp and Soak
Each is discussed separately in the following sections.
In Control mode, the muffle furnace maintains a set temperature
until that set temperature is changed.
To set a temperature and initiate Control mode operation, perform the
following:
1. Place the power switch in the ON position.
2. If the Run LED is lit or blinking, press Run key until the indicator
remains off.
3. Observe the set temperature in the Set Display window.
4. To increase the set temperature, press the UP arrow key.
5. To decrease the set temperature, press the DOWN arrow key.
6. When the desired set temperature is shown, release the UP or DOWN
arrow key. The muffle furnace automatically begins controlling to
the set temperature.
Note: To rapidly increase or decrease the set temperature,
Press and hold the appropriate arrow key. To
slowly increment or decrement the set temperature
one degree at a time, press and immediately
release the arrow key.

Page 8
Programmable Muffle Furnaces
Ramp and Soak
Mode
In Ramp and Soak mode of operation, the muffle furnace executes a
sequence of program commands. During a ramp period, the muffle
furnace temperature is controlled to increase (or decrease) at a linear rate
set by the operator. During a soak period, the furnace maintains a constant
temperature for a time interval selected by the operator.
Program Steps
A program consists of a sequence of operations or "steps" which the
muffle furnace is set up to perform. The programmed operations are
executed in the order entered: step 1, step 2, step 3, etc. A single program
may have a maximum of 24 steps, or as few as two (one must be an End).
Program steps may be selected from among the four basic operations
described below. The corresponding display for each operation is shown
at the left:
A Set Point (SP) program step causes the furnace set temperature (shown
in the Set Display) to be linearly increased or decreased ("ramped") at a
selected rate. The Set Point operation begins at the current set temperature
and finishes at the programmed Set Point temperature.
Soak causes the final set temperature from the preceding step to be held
for a time interval of up to 23 hours, 59 minutes and 59 seconds. This
duration may be extended by adding further Soak steps or using a Jump
Loop (see below).
A Jump Loop operation causes program execution to jump to another
designated program step. Each program step, up to the Jump Loop, is
then sequentially repeated. Use of a Jump Loop allows a programmed
temperature cycle to be repeated up to 100 times. A Jump Loop cannot be
used as the first step in a program.
Program execution proceeds sequentially through each program step until
an End is encountered, or until all 24 program steps have been completed.
An End may be set up to cause the furnace to maintain the final set
temperature indefinitely or simply to turn off heater power.
If no End is used, all 24 program steps will be completed, then the furnace
will maintain the final programmed set temperature.

Page 9 Programmable Muffle Furnaces
.
Creating a Ramp
and Soak Program
Model 650 Model 750
Display Display
Creating a program consists of constructing a sequence of the four basic
operations, Set Point (ramp), Soak, Jump Loop and End,) to produce a
desired temperature cycle. For each operation selected, several options
also must be specified. To enter a ramp and soak program, perform the
following procedures:
Note: During programming, the MODE key serves as an
"enter" key to select a value shown on the Actual
Display for a corresponding parameter shown on the
Set Display.
1. Verify the RUN LED is not lit. If it is, press the RUN key until it
goes out.
2. Press the MENU key. The No Program display should appear
(see left).
NOTE: If no key is pressed for one minute, the display
automatically reverts to Control mode.
3. Press the UP-Arrow key once to present the program entry menu
selection.
Note: Model 750 will prompt for program number (1 to 4),
while Model 650 prompts for single program entry
(Yes/No).
4. Use the UP or DOWN Arrow key to select the desired program
number. Up to four programs can be entered (Model 750 only).
5. Press the MENU key to initiate entry of the first program
number (Model 750 only), or when the Actual display indicates
YES (Model 650).
6. Press the UP or DOWN Arrow key until the Actual Display
shows the number of the step to program. Press the MENU
key to enter the desired program step (1 to 24).
7. The Set Display then indicates 'StyP to signify that the step type
must be selected from a menu of four operations being shown in
the Actual Display. The four menu selections are Set Point (ramp),
Soak, End or Jump Loop. These menus appear as shown on the
left. Repeatedly press the UP or DOWN Arrow key until the
desired step type appears:
NOTE: For step 1 in a program, the jump loop option is
not available.

Page 10
Programmable Muffle Furnaces
8. If the desired program step is a ramp to a Set Point, press the
MENU key to select it when the Actual Display reads "SP”.
Otherwise, skip to step .11.
9. If a ramp to a Set Point is selected, the Set Display first indicates
"SP" to signify that the operator must select a final target
temperature, or set point. Use the UP or DOWN Arrow key to
adjust the Actual Display to indicate the desired final temperature
for the ramp.
Press the MENU key to enter the selected set point temperature.
10. The Set Display then indicates "rAtE" to prompt the operator to
select a desired heating or cooling rate in °C/min or °F/min. Press
and hold the UP or DOWN Arrow key until the desired rate is
shown in the Actual Display.
Press the MENU key to enter the selected rate. Proceed to step 21.
11. If the desired program step is a Soak, press the MENU key to select
it when the Actual Display shows "'SoAh.". Otherwise, skip to step
15.
12. If a Soak is selected, the Set Display first indicates "HOUr" to signify
that the operator must select the number of hours for which the current
set temperature will be maintained. Use the UP or DOWN Arrow
keys to adjust the Actual Display to indicate the desired number of
soak hours (maximum of 23 hours).
Press the MENU key to enter the selected number of soak hours.
13. The Set Display then shows "Min" to indicate that the operator must
select the number of additional minutes for which the current set
temperature will be held. Use the UP or DOWN Arrow keys to set the
Actual Display to the desired number of soak minutes (maximum of
59).
Press MENU to enter the selected number of soak minutes.
14. The Set Display then shows "SEC" to indicate that the operator must
select the number of additional seconds for which the current set
temperature will be held. Use the UP or DOWN Arrow key to adjust
the Actual Display to indicate the desired number of soak seconds
(maximum of 59).
Press the MENU key to enter the selected number of soak
seconds. Proceed to step 21.
15. If the desired program step is a Jump Loop, press the MENU key to
select it when the Actual Display shows "JL.'" Otherwise, skip to step
18.

Page 11 Programmable Muffle Furnaces
16. If a Jump Loop is selected, the Set Display first indicates "JS" to
signify that the operator must select the step number destination for
the jump. Use the UP or DOWN Arrow key to adjust the Actual
Display to indicate the desired step number.
NOTE: The jump step number must be lower than the
current step number. The jump cannot be to the
current step or a higher step.
Press the MENU key to enter the selected jump step.
17. The Set Display then shows “JC” to indicate that the operator must
select the number of times the jump loop is to be repeated.
Use the UP or DOWN Arrow key to adjust the Actual Display to
select the number of times the loop is to be repeated.
Press the MENU key to enter the selected number of jump counts.
18. If the desired program step is an End, press the MENU
key to select it. Otherwise, skip to step 11.
19. If End is selected, the Set Display shows "End" and the Actual
Display shows one of the two options for an End step. To view
each selection, repeatedly press either the UP or DOWN key. The
options appear as shown on the left.
20. If the final temperature is to be held indefinitely at the end of the
ramp and soak program, press the MENU key when "HoLd" is
displayed on the Actual Display. If heater power is to be turned off at
the end of the program, press the MENU key when the Actual Display
indicates "OFF." Proceed to step 21.
21. Once a program step is entered, the display indicates “no rtn”.
If further steps are to be programmed, press the MENU key to
continue programming. The next program step will be displayed.
Return to step #6 of this procedure to add more program steps.
Up to 24 can be entered per program. The Model 750 can
accommodate four 24-step programs.
22. If no further program steps are required, press the UP Arrow key.
The displays indicate “YES rtn”.
Press the MENU key to return to control mode operation. To
initiate the program, see Running, Stopping or Resuming a Program.

Page 12
Programmable Muffle Furnaces
Running, Stopping
or Resuming a
Program
Model 750
Display
Prior to running the program in memory, first make certain that the
current set temperature is the temperature from which the program is to
start. For example, a program intended to ramp the furnace temperature
from ambient to 600 °C, if started with the current set temperature at
1000 °C, will actually ramp the temperature down from 1000 °C to 600
°C. Use the UP/DOWN arrow keys to change the set temp if necessary.
To run the program currently in memory, perform the following steps:
1. Press the RUN key once. The Run indicator light begins to flash and
the displays indicate the first program number (Model 750) or the first
program step (Model 650). If running a program from a Model 650,
skip to step 3.
2. If running a program from a Model 750, use the UP or DOWN arrow
keys to cycle the Actual display to the desired program number, 1
through 4, or NO to cancel. Use the MENU key to select the desired
program number to run.
3. The displays now indicate the first program step. Program execution
will begin at the current program step. To change the program step
use the UP or DOWN arrow key until the desired step is displayed.
Press the RUN key to initiate the run, beginning at the program step
number shown.
Observe that the Run indicator comes on full signifying that the
furnace is in the ramp and soak mode with a program underway.
To stop a running program, press the RUN key. The RUN LED will
turn off and furnace operation returns to the Control mode, with the
set temperature at the last value achieved by the program.
To Resume program execution after stopping a program, press the
RUN key. The RUN LED will begin to blink. Press the MENU key.
The displays indicate “x rESU”, where x is the last executed program
step. Press the RUN key again. The program will continue executing
at the point it was stopped.

Page 13 Programmable Muffle Furnaces
Viewing Program
Status
While a ramp and soak program is running, the status of the current
program step may be viewed. With the Run LED lit to indicate
the program is running, successively press the MENU key. Each
control parameter associated with the current program step then is
displayed sequentially. The parameter type is indicated in the Set
Display, while the value for the parameter appears in the Actual
Display. A final press of the MENU key returns the displays to
tracking the actual and set temperatures.
The specific control parameters displayed in any instance depend
upon whether the current step is a Set Point or a Soak operation. The
sequence of control parameters displayed in each case, and the
corresponding Set Display messages (left), is as follows:
Set Point or Soak Step
End Set Point Target final temperature at the
completion of the ramp.
Rate Rate of change of temperature, in
°C/min, for the ramp.
Elapsed Jump Count
If a Jump Loop is in progress, indicates
the number of times the loop has been
executed.
Step Current program step.
Hour Hours remaining in the soak step.
Min Minutes remaining in the soak step.
Sec Seconds remaining in the soak step.

Page 14
Programmable Muffle Furnaces
An Example
Program
The ASTM method for Ash Analysis of Coal and Coke (D 3174-89)1
specifies the following ramp and soak operations:
Step 1: Ramp from ambient to 500 °C at 8.0 °C/min (i.e., in 1 hour)
Step 2: Ramp from 500 °C to 750 °C at 4.2 °C/min (i.e., in 1 hour)
Step 3: Soak at 750 °C for two hours
Step 4: Turn off power to the heaters and allow to cool
To set up and run this program, perform the following procedures.
Programming Step 1:
1. With the Run LED off, press the RUN key. Press the MENU key
until the displays indicate “no Prog”.
2. Press the UP arrow key. The displays will now indicate “YES
PrOg” (Model 650) or “1 PrOg” (Model 750). Press the MENU
key again.
3. The displays now show “1 StEP”. Press the MENU key to begin
programming at step #1.
4. Press the UP or DOWN arrow key until the displays indicate “SP
StyP”. Press the MENU key to select the set point ramping
command.
5. Use the UP or DOWN arrow keys to display the desired set point
in the upper display (500°C). When the displays indicate “500
SP” (500 set point), press the MENU key to select the
temperature.
6. The controller will next prompt for the ramping rate. Use
the UP or DOWN arrow keys to enter the desired ramping
rate in degrees/min (8.0°C/min). Press the MENU key to
select the ramping rate.
7. The first step is now programmed. The controller will then
display “no rEtn”. Press the MENU key to remain in the program
editing mode. “2 StEP” is then displayed. Press the MENU key
to continue.
Programming Step 2:
8. Press the UP or DOWN arrow key until the displays indicate “SP
StyP”. Press the MENU key to select the second set point
ramping command.
9. Use the UP or DOWN arrow keys to display the desired set point
in the upper display (750°C). When the displays indicate “750
SP” (750 set point), press the MENU key to select the
temperature.
1American Society for Testing and Materials, Gaseous Fuels: Coal
and Coke, Vol.05.05, Section 5, pp.326-8

Page 15 Programmable Muffle Furnaces
10. The controller will next prompt for the ramping “rate”. Use
the UP or DOWN arrow keys to enter the desired ramping
rate in degrees/min (4.2°C/min). Press the MENU key to
select the ramping rate.
11. The controller will then display “no rEtn”. Press the MENU key
to remain in the program editing mode. “3 StEP” is then
displayed. Press the MENU key to continue.
Programming Step 3
12. Press the UP or DOWN arrow key until the displays indicate
“SoAh StyP”. Press the MENU key to select soak as the step
type.
13. The displays will now show “0 Hour”. Use the UP or DOWN
arrow keys to display the desired soak time in hours (2). Press
the MENU key to select two hours of soaking.
14. The controller will next prompt for the desired minutes of
soaking “0 Min”. Press the MENU key to select zero
minutes.
15. The controller will next prompt for the desired seconds of
soaking “0 Sec”. Press the MENU key to select zero
seconds.
16. The total soak time is now programmed; 2 hrs, 0 minutes
and 0 seconds. The controller will then display “no rEtn”.
Press the MENU key to remain in the program editing
mode. “4 StEP” is then displayed. Press the MENU key to
continue.
Programming Step 4
17. Press the UP or DOWN arrow key until the displays indicate End
StyP. Press the MENU key to select the end command.
18. Press the Up arrow key until the displays show “oFF End”. Press
the MENU key to select.
19. Once and End statement is programmed, the controller will
prompt the user to save the current program, “SAVE”. Press the
MENU key to save the program. The controller then returns to
normal control mode.
Follow the procedures on page 12 to run the program.

Page 16
Programmable Muffle Furnaces
High Temp
Alarm
Open
Thermocouple
Calibration
All Cole-Parmer Furnaces come equipped with high temperature alarms.
When an alarm condition occurs, power to the heaters is removed while
the Set display flashes between the current set temperature and “HI”.
The high temperature alarm will activate when the actual temperature is
greater than the set temperature by more than 25°C (45°F). The alarm
condition will continue until the actual temperature falls within 5°C
(9°F) of the set temperature.
When the displays show “oPEn xx”, where “xx” designates the last set
temperature, an open thermocouple is being detected. Check the
thermocouple connection and replace if necessary.
To calibrate the furnace, place a reference thermometer or thermocouple
lead inside the furnace chamber located as close to the geometric center
of the chamber as possible. Set the furnace to the desired temperature
and allow enough time for the temperature to stabilize.
CAUTION: Use thermometers/thermocouples
suited for operation at temperatures equal to or
higher than the desired calibration temperature.
Note the temperature as indicated by the reference thermometer.
Compare it to the temperature in the Actual display. If the two readings
do not agree, press the MENU key twice. The displays should show “0
CAL”. Use the UP or DOWN arrow key to adjust the calibration (CAL)
number to a value which will equal the temperature of the reference
thermometer when added to the most recent temperature of the Actual
display.
For Example: A furnace is set to 500°C and allowed to stabilize.
The reference thermometer indicates 505°C. The furnace Actual
display shows 500°C. The calibration (CAL) value is set to +5in
order for the Actual display to agree with the reference
thermometer. Press the MENU key four more times until the
displays show the temperatures with the Actual temperature
corrected.

Page 17 Programmable Muffle Furnaces
Units
Power Failure
Data Logging
The controller can be set up to display units in °C or °F. To
change or verify the units being displayed simply press the MENU
key until the displays show “C C_F”. The current units are
displayed in the Actual display. To display temperatures in °C
press the MENU key when the Actual display Indicates “C”.
To display temperatures in °F, simply press the UP Arrow key
until the Actual display shows “F” then press the MENU key to
accept.
In the event a power failure occurs while operating in the ramp
and soak mode, the controller can be set up to react in one of three
ways; continue, hold or abort program execution. If a power
failure occurs while operating in the control mode, the furnace
will continue controlling at the last set temperature when power is
restored.
The power failure options available in the ramp and soak mode
are given below:
Continue (Cont)-Continues program execution at the point the
furnace lost power.
NOTE: The controller will continue a soak step to the nearest
minute the program was interrupted.
Hold (HoLd)-Upon return of power, the program controls at
the last set temperature attained by the running program. The
displays will indicate “Pout xx”, where “xx” designates the
last set temperature. The displays can be cleared by pressing
the MENU key.
Abort (Abrt)-Upon return of power, program execution is
terminated. The heaters are turned off and the displays
indicate “Pout 0”.
To view/change a power failure procedure, press the MENU key
until the displays show “Cont Pout”. To continue program
execution after a power failure, simply press the MENU key. To
change the power failure option, press the UP Arrow key to
change the actual display to one of the above options. Press the
MENU key to select the desired option.
The final menu display is for setting up logging parameters used
for serial communications. See the Serial Communications
section (next page) of this manual for instructions on serial
communication. To access the data logging parameters, press the
MENU key until the displays show “no Log”.

Page 18
Programmable Muffle Furnaces
Trouble
Shooting Table
Press the UP arrow key. The displays will now indicate “Yes
Log”. Press the MENU key a second time. The following
communication options can be selected:
•BAud Use the UP or DOWN arrow key to select the
baud rate. Press the MENU key to enter.
•int Use the UP or DOWN arrow key to select the
logging interval in minutes. Use the MENU
key to enter the value.
This table is intended to assist in resolving user-correctable
furnace problems by relating symptoms to their likely causes. If
service beyond the scope of this table is required, contact Cole-
Parmer at 1-800-323-4340 or 1-847-549-7600.
Symptom Probable Cause Action
Furnace temperature
erratically high.
Defective control
thermocouple.
Replace control
thermocouple.
Heaters turn off only
when alarm is
activated.
Defective solid
state relay.
Check solid state
relay. Replace if
necessary.
Failure to heat Set temp is less
than actual temp.
Refer to operation.
Door switch is not
activating safety
relay.
Check door switch
(S2). Replace if
necessary.
Magnetic relay not
closing.
Check magnetic
relay, replace if
necessary.
Solid state relay is
not turning on.
Replace solid state
relay.
Defective heater
element.
Check heater
resistance. Replace
if necessary.
Defective
controller.
Contact Cole-
Parmer Services.