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...
Safety Information Your Fisher Isotemp ® Programmable Muffle Furnace has Alert Signals 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 Warning user follow installation instructions exactly as written.
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).
Installation Selecting a Location Caution Choose a location for the furnace, which will provide an Do not install closer than 6 inches area of approximately four square feet (2 ft x 2 ft). The to a wall of combustible material. 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.
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;...
NSTALLATION Figure 1 – Furnace Layout Exhaust Port Thermocouple Hearth Plate 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: With the power switch in the ON position, press...
PERATION 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. Press and hold the UP arrow keypad to increase or the Down arrow keypad to decrease the offset Note value.
Service 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 Caution sections describe procedures for replacing a heater or the Only qualified personnel should con- control thermocouple.
ERVICE Replacing the Thermocouple To replace a defective thermocouple, perform the follow- ing steps: Perform steps 1 through 3 in Replacing a Heater. Gently remove the thermocouple from inside the chamber by pulling it though the back wall of the furnace.
Troubleshooting 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 Fisher Technical Support at 1-800-926-0505. Symptom Probable Cause Action Furnace won’t power up. Circuit breaker tripped.
Replacement Parts Replacements for muffle furnace parts serviceable by the user may be ordered, by part number, from Fisher Scientific Co. Item Part Number Line Cord and Plug Model 550-14, (120V) SPN103011 (208/240V) SPN95774 Model 550-58 (208/240V) SPN95774 Models 550-126...
Accessories and Supplies Item Part Number Ceramic Wool (1 inch wide strip) SPN40885 Ledge (Model 126 Only) SPN83985 A variety of accessories and supplies suitable for use with the Isotemp Muffle Furnaces are available from Fisher. Catalog numbers of commonly used items are listed below for convenience.
Performance Characteristics Operating Range 50°C to 1125°C (90°F to 2025°F) Average Temperature Uniformity Model 14 ±5°C (±9°F) Model 58 ±8°C (±14.4°F) Model 126 ±10°C (±18°F) Average Temperature Stability ±1°C (±2°F) Set Point Repeatability ±1°C (±2°F) Set Point Accuracy Model 14 ±5°C (±9°F) Model 58 ±10°C (±18°F)
Warranty Laboratory instruments and equipment manufactured by Fisher Scientific Company L.L.C. – Laboratory Equipment Division (hereinafter called “the Company”) are warranted only as stated below. Subject to the exceptions and upon the conditions specified below, the Company agrees, at its election, to...