Fisher Scientific Isotemp Muffle Furnace Manual

The Fisher Scientific Isotemp Muffle Furnace is a high-temperature laboratory furnace designed for applications such as ashing, heat treatment, and materials testing. It features precise temperature control, durable ceramic interior, digital display, safety interlocks, and programmable temperature settings. Operating temperature range up to 1100°C (2012°F) with uniform heating. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Operating Procedures 7. Maintenance 8. Safety Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Ceramic chamber, Digital temperature controller, Heating elements, Door safety switch, Power cord, Ventilation ports.

Feature	Description
Ceramic chamber	High-temperature resistant interior for uniform heating
Digital temperature controller	Precise temperature setting and monitoring
Heating elements	Rapid heating to maximum temperature
Door safety switch	Automatically cuts power when door is opened
Power cord	For electrical connection
Ventilation ports	Prevents overheating during operation
Temperature display	Shows set and actual temperature
Programmable settings	Allows for temperature ramping and hold times
Over-temperature protection	Prevents exceeding safe operating limits
Power switch	Turns furnace on/off

Installation

Unpack and inspect contents. Place on stable, heat-resistant surface.

Location: Install in well-ventilated area away from flammable materials.
Electrical connection: Connect to appropriate power supply (check voltage requirements).
Grounding: Ensure proper grounding for safety.
Clearance: Maintain minimum 6-inch clearance on all sides.

WARNING! Furnace reaches extremely high temperatures; install away from combustible materials. Ensure proper ventilation.

First-Time Setup

Power on furnace; follow initial setup procedure.

Initial burn-off: Run empty at 400°C for 2 hours to remove manufacturing residues.
Temperature calibration: Verify temperature accuracy with calibrated thermometer.
Program settings: Set default temperature parameters if programmable.
Safety check: Test door safety switch and over-temperature protection.

CAUTION! Wear heat-resistant gloves during initial setup. Do not touch hot surfaces.

Specifications

Chamber Size: Varies by model (typically 4-12 liters).
Temperature Range: Up to 1100°C (2012°F).
Temperature Control: Digital PID controller with ±1°C accuracy.
Heating Rate: Programmable ramp rates available.
Power Requirements: 120V/240V AC, 50/60Hz.
Chamber Material: Ceramic fiber insulation.
Exterior Dimensions: Varies by model.
Weight: 30-60 kg depending on model.
Certifications: CE, UL, CSA compliant.

Controls and Settings

Access control panel for temperature programming and monitoring.

Control Panel: POWER, Temperature setpoint, Program buttons, Display, Alarm indicators.

Temperature Settings: Setpoint adjustment, Ramp rate, Hold time, Soak duration. Safety: Over-temperature protection, Door interlock, Power failure recovery. Programming: Multi-segment programs, Temperature profiles, Memory storage.

Operating Procedures

Standard operating sequence for sample processing.

Preparation: Load samples using ceramic crucibles or boats.
Programming: Set desired temperature profile.
Start cycle: Close door securely and start program.
Monitoring: Observe temperature display during operation.
Completion: Allow furnace to cool before opening door.
Removal: Use tongs to remove hot samples.

Tip: Always pre-heat furnace to desired temperature before loading samples for consistent results.

Maintenance

Regular maintenance ensures optimal performance and longevity.

Monthly: Inspect heating elements for damage.
Quarterly: Clean chamber interior with soft brush.
Annually: Calibrate temperature controller.
As needed: Replace worn components.

WARNING! Always disconnect power before performing maintenance. Allow furnace to cool completely.

Safety Features

Multiple safety systems protect users and equipment.

Feature	Function
Door safety interlock	Cuts power when door opens
Over-temperature protection	Prevents exceeding set limits
Ground fault protection	Electrical safety
Thermal insulation	Reduces exterior temperature
Alarm system	Audible/visual warnings for faults

Care & Cleaning

Disconnect power and allow to cool completely before cleaning.

Interior: Use soft brush to remove debris from chamber.
Exterior: Wipe with damp cloth; avoid harsh chemicals.
Heating elements: Inspect for oxidation or damage.
Ventilation: Keep ports clear of obstructions.

CAUTION! Never use water or liquid cleaners on hot surfaces. Wear protective equipment.

Regulatory Information

UL 3101-1: Laboratory electrical equipment safety standards. CE Marking: Complies with European safety standards. Copyright © 2025 Fisher Scientific; trademarks of Thermo Fisher Scientific. For technical support, visit www.fishersci.com or contact 1-800-766-7000.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace not heating	Power supply/elements	Check power connection; inspect heating elements; verify settings.
Temperature inaccurate	Calibration/controller	Recalibrate temperature sensor; check controller settings.
Door won't close properly	Obstruction/latch	Clear chamber obstructions; inspect door latch mechanism.
Error codes displayed	System faults	Refer to error code chart in manual; reset if applicable.
Overheating	Ventilation/controller	Ensure adequate ventilation; check over-temperature protection.

Reset: Power cycle unit; reset controller to factory defaults if needed.

Service: 1-800-766-7000; www.fishersci.com