Fisher Scientific Isotemp 550 Series User manual

Isotemp®Muffle Furnace

550 Series

Instruction Manual

Model 14

Catalog No. 10-550-14 & 14A

Model 58

Catalog No. 10-550-58

Model 126

Catalog No. 10-550-126

83854 • 04/11/06

Table of Contents

Safety Information ..............................................................................................................................................3

Alert Signals..................................................................................................................................................3

Introduction..........................................................................................................................................................4

Installation ..........................................................................................................................................................5

Selecting a Location ....................................................................................................................................5

Unpacking ....................................................................................................................................................5

Preparing the Furnace ..................................................................................................................................6

Furnace Layout ..................................................................................................................................................7

Operation ............................................................................................................................................................8

Power On Reset ..........................................................................................................................................8

Entering a Set Temperature..........................................................................................................................8

Setting the Display Offset ............................................................................................................................8

Example Offset ............................................................................................................................................9

Open Thermocouple ....................................................................................................................................9

Over-Temperature Indicator..........................................................................................................................9

Service ..............................................................................................................................................................10

Replacing a Heater ....................................................................................................................................10

Replacing the Thermocouple ......................................................................................................................11

Troubleshooting ................................................................................................................................................12

Replacement Parts............................................................................................................................................13

Accessories and Supplies ................................................................................................................................14

Performance Characteristics ............................................................................................................................15

Specifications ....................................................................................................................................................16

Wiring Diagram..................................................................................................................................................17

Warranty ............................................................................................................................................................20

Your Fisher Isotemp®Programmable 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. It is most important that the

user follow installation instructions exactly as written.

Failure to do so is likely to lead to improper operation,

erroneous calibrations and possible damage to the equip-

ment. Do not attempt operation without this information.

When 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.

• Use the supplied hearth plate on the chamber

bottom

Safety Information

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.

Hot Surface

Hot surfaces alert you to a possibility

of personal injury if you come in con-

tact with a surface during use or for a

period of time after use.

Alert Signals

Introduction

Fisher Isotemp 550 Series Muffle Furnaces are available

in three sizes: small (Model 14), medium (Model 58) and

large (Model 126). All models provide PID microproces-

sor 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 opera-

tion. The furnace is heated by electric resistance ele-

ments embedded in easily removable side and base pan-

els. The heating elements are designed to ensure

extended service life, even in atmospheres characteristic

of high-sulfur coal and coke samples.

Temperature readout can be easily viewed on the 7-seg-

ment display. A heater LED located to the left of the tem-

perature display indicates when the heater is being ener-

gized.

For operation with chamber atmospheres other than air

(N2, C02, etc), external gas supplies connect easily

through a provided 3/8-inch port. An Injection Port Kit

(10-550P) connected to the exhaust port allows

convenient venting of the chamber.

Isotemp 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 100°C or more. The alarm condition

is indicated by a flashing “HIGH” on the display. A venti-

lated base design prevents damage to the bench or coun-

tertop.

Athree button control provides simple operation. Arrow

keys service to increase or decrease the furnace temper-

ature set point. A front panel Mode key allows the user to

toggle the display between set point temperature or actual

furnace temperature.

Selecting a Location

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.

It is recommended that the site have facilities for venting

an accessory Exhaust Tube Assembly (Cat. No.10-490-

10) 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.

Unpacking

Fisher Isotemp 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 num-

ber, to your Fisher branch or representative. In the event

of shipping damage, retain the carton and packing materi-

al and file a claim with the final carrier.

Item

Furnace Assembly

Model 14 120 V, 50/60 Hz

Model 14A 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

Installation

Caution

Do not install closer than 6 inches

to a wall of combustible material.

Caution

Remove packing materials inside

chamber before operating.

Preparing the Furnace

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 cham-

ber. Orient hearth plate such that smooth sur-

face faces upward. See Fig. 1.

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 fur-

nace (see Fig 1). Use three screws to secure

the port flange to the exhaust port. Attach tub-

ing to port flange using a hose clamp (provided).

Finally, route free end of tube to fume hood or

other outside vent. If desired, exhaust tube may

be cut to length using a hacksaw.

INSTALLATION

Warning

Isotemp Muffle Furnace chambers

contain alumina silicate ceramic fibers.

With continued use at temperatures

above 1000°C (1832 °F), these materi-

als 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 Fisher Scientific for further

information.

Warning

This unit is not explosion proof. Do

not use in the presence of flammable

or combustible materials; fire or explo-

sion may result. Unit contains compo-

nents that may ignite such materials.

Figure 1 – Furnace Layout

INSTALLATION

Hearth Plate

Thermocouple

Exhaust Port

1 Heater Indicator LED 5 Temperature Display Window

2 Mode Key 6 ON/OFF Power Switch

3 Increase Key 7 Door Switch

4 Decrease Key

See the following pages for keypad/display descriptions.

Operation

Power on Reset

When power is initially turned on to the furnace, the dis-

play will show “InIt” followed by the current furnace tem-

perature reading. The control display window shows furn-

cace temperature in °C.

Entering a Set Temperature

To enter a temperature setpoint, perform the following

steps:

1. With the power switch in the ON position, press

the Mode keypad. The display shows the latest

temperature setpoint.

2. In order to change the temperature setpoint,

press the UP arrow key to increase or the

DOWN arrow key to decrease. Once either key-

pad is pressed the decimal point will illuminate

to indicate a change in setpoint. Hold the

UP/DOWN keypad in until the desired setpoint

is reached.

3. Press the MODE keypad again or don’t press

any keypad for 3 seconds and the setpoint will

update with the setpoint indicated on the display.

Once the desired setpoint is entered, the heater indicator

LED will light and the chamber will begin to heat towards

the setpoint.

Setting the Display Offset

Isotemp Muffle Furnaces permit the user to calibrate the

temperature display and control point to a reference stan-

dard set up to read the interior furnace temperature at

any given point. With a display offset entered, the temper-

ature shown on the display will be actual furnace temper-

ature plus or minus the display offset selected.

To enter a display offset, carry out the following steps:

1. Place power switch in the OFF position.

Note

If no keypad activity occurs within 3

seconds, the display will return to the

temperature display mode.

2. While pressing the MODE keypad, place the power

switch in the ON position. The display now shows

the current offset value. The display offset values

are limited to a range of ±30°C.

3. Press and hold the UP arrow keypad to increase or

the Down arrow keypad to decrease the offset

value.

4. Press the MODE keypad again to enter the new off-

set value or wait 3 seconds and the new value will

automatically be entered.

When finished, the temperature display will be updated based

on the offset value entered. For example:

Example Offset

Adesired setpoint of 450°C. is entered and the furnace is

allowed 1 hour to stabilize to the setpoint. A reference temper-

ature is then measured inside the chamber to be 455°C. In

order to match the temperature display to the reference ther-

mometer, a display offset of 5 is entered. The temperature

display is then increased by 5°C and the display is in agree-

ment with the reference standard. The control will then cut the

heater ON time down so that the chamber cools by 5°C, thus

matching the desired setpoint.

Open Thermocouple

In the event the thermocouple becomes detached or broken,

the display will indicate so by showing “otc” (open thermocou-

ple). When this condition is encountered, the heaters are held

off. Repair or replace the thermocouple connection as needed

to clear the display.

Over Temperature Indicator

If the temperature in the chamber exceeds the setpoint by

100 C, the display will warn the user by flashing “HIGH” along

with the current chamber temperature. Also, the safety relay

will cut the heater circuit out and de-energize the heater.

Allow the unit to cool and the “HIGH” temperature alarm will

turn off when it falls to within 25°C of the setpoint. The con-

troller will then resume normal heater control.

OPERATION

Note

If no keypad activity occurs within 3

seconds, the display will return to the

temperature display mode.

Note

This condition can also be created by

decreasing the setpoint 100 C lower

than the current chamber temperature.

Service

Caution

Only qualified personnel should con-

duct service to the furnace.

WARNING

Always disconnect power cord from

the power supply before servicing

instrument.

All Fisher Isotemp 550 Series Muffle Furnaces use wall

heaters. The Model 550-58 and 550-126 also incorporates

a floor heater to maintain uniform heating. The following

sections describe procedures for replacing a heater or the

control thermocouple.

Replacing a Heater

To replace a defective heater, proceed as follows:

1. Disconnect power cord from the electrical out

let.

2. Open chamber door and allow door to remain

open throughout heater replacement.

3. Remove the screws that secure the perforated

metal back panel of the furnace main chassis.

Remove the panel and set it aside.

4. Loosen two heater terminal screws located on

the terminal barrier strip. Straighten the lead

screws.

5. Carefully withdraw the defective heater from the

chamber. Ceramic wool insulated surrounding

heater wires will fall into the furnace chamber.

Remove it and set it aside for later use.

6. Carefully install the replacement heater be

reserving the procedure in step 5 above.

7. Carefully re-attach the heater terminals by

reversing step 4. Then refill the holes around

heater leads with ceramic wool preserved from

step 5.

8. Re-install perforated metal back panel of the fur-

nace.

9. When the above steps are complete, return the

power cord to the electrical outlet.

Note

Allow chamber to cool to ambient tem-

perature before attempting repair.

Caution

Heater panel material is fragile.

Exercise care when inserting replace-

ment panels into the furnace chamber.

Likewise, bend or flex the heater leads

gently when necessary.

This manual suits for next models

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