Lindberg Tube Furnace 55035 Manual

The Lindberg Tube Furnace 55035 is a high-temperature laboratory furnace designed for various thermal processing applications. This single-zone tube furnace features a maximum operating temperature of 1200°C, digital temperature controller, ceramic fiber insulation, and quartz tube work chamber. 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. Connecting Accessories 7. Operating Procedures 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-temperature heating elements, Digital PID controller, Quartz tube chamber, Ceramic fiber insulation, Over-temperature protection, Cooling fan.

Feature	Description
Heating elements	Kanthal wire heating elements for high-temperature operation
Digital controller	PID temperature control with programmable ramps
Quartz tube	High-purity quartz work chamber (OD 50mm)
Insulation	Ceramic fiber insulation for energy efficiency
Power input	120V AC, 15A standard outlet
Temperature range	Ambient to 1200°C maximum
Cooling system	Built-in cooling fan for rapid cooldown
Safety features	Over-temperature protection, door interlock
Display	LED digital display for temperature and status
Control buttons	SET, UP, DOWN, ENTER for programming

Installation

Unpack and inspect contents. Place on stable, level surface.

Location: Install in well-ventilated area with adequate clearance (minimum 6 inches from walls).
Power connection: Connect to dedicated 120V, 15A circuit with proper grounding.
Tube installation: Carefully insert quartz tube, ensuring proper seating in end caps.
Gas connections: Connect gas inlet/outlet tubes if required for process atmosphere.
Verify installation: Ensure all connections are secure before powering on.

WARNING! Furnace operates at extremely high temperatures; maintain safe distance during operation. Ensure proper ventilation.

First-Time Setup

Power on furnace; follow initial setup procedure.

Initial heating: Run furnace empty at 500°C for 2 hours to burn off manufacturing residues.
Controller setup: Set temperature units (°C/°F) and control parameters.
Program setup: Configure ramp rates and hold times for typical processes.
Safety check: Verify over-temperature protection is functioning properly.
Calibration: Check temperature accuracy with external thermocouple if required.

CAUTION! Wear appropriate PPE (heat-resistant gloves, safety glasses) when operating furnace.

Specifications

Maximum Temperature: 1200°C (2192°F)
Heating Rate: Up to 20°C/minute to 1000°C
Tube Dimensions: 50mm OD × 600mm length
Power Requirements: 120V AC, 15A, 1800W
Controller Type: Digital PID with auto-tuning
Temperature Uniformity: ±5°C at 1000°C
Thermocouple: Type K (included)
Cooling Time: 1000°C to 200°C in approximately 90 minutes
Dimensions: 500mm W × 400mm D × 400mm H
Weight: 25 kg

Controls and Settings

Access control functions via front panel buttons and digital display.

Front Panel: POWER switch, SET button, UP/DOWN arrows, ENTER button, digital display.

Temperature Control: Set point adjustment, ramp rate programming, hold time setting. Safety: Over-temperature protection setting, door interlock status. Display: Current temperature, set point, program status, error codes. Programming: Multi-segment programs with ramp and hold functions.

Connecting Accessories

Gas flow systems: Connect to gas inlet/outlet ports. Vacuum systems: Connect to vacuum pump via appropriate fittings. Temperature monitoring: External thermocouple connections. Data logging: RS-232 or USB output for process recording.

Turn off furnace before connecting accessories.
Use appropriate high-temperature fittings and seals.
Pressure test gas/vacuum connections before heating.
Ensure all connections are rated for maximum operating temperature.

Tip: Always use high-temperature rated tubing and fittings for gas connections.

Operating Procedures

Standard operation for thermal processing applications.

Loading: Carefully place samples in quartz boat and insert into tube center.
Gas flow: Establish appropriate gas flow rate if using process atmosphere.
Programming: Set desired temperature profile using controller.
Heating: Start program and monitor temperature ramp.
Hold: Maintain at target temperature for required duration.
Cooling: Allow furnace to cool naturally or with forced cooling.
Unloading: Remove samples only when temperature is below 100°C.

WARNING! Never touch hot surfaces. Use proper handling tools and PPE.

Safety Features

Over-temperature Protection: Automatic shutdown if temperature exceeds set limit. Door Interlock: Prevents operation when access door is open. Ground Fault Protection: Electrical safety circuit. Cooling Fan: Prevents overheating of exterior surfaces.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

Monthly: Inspect heating elements and thermocouple for damage.
Quarterly: Clean quartz tube with appropriate solvents.
Annually: Check electrical connections and calibrate temperature controller.
As needed: Replace worn gaskets and seals.

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

Regulatory Information

UL Listed: Complies with UL safety standards. CE Marked: Meets European Union safety requirements. FCC Part 15: Class A digital device; may cause interference in residential areas. Copyright © 2025 Lindberg; trademarks of SPX Corporation. For technical support, visit www.lindbergfurnaces.com or contact 1-800-873-5658.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't heat	Power supply/controller	Check power connection; verify controller settings; check circuit breaker.
Temperature unstable	Thermocouple/controller	Check thermocouple connection; perform PID auto-tune; replace thermocouple if damaged.
Error code displayed	Various faults	Refer to error code table in appendix; reset controller; check safety interlocks.
Quartz tube cracked	Thermal shock/age	Replace quartz tube; avoid rapid temperature changes; inspect for stress points.
Poor temperature uniformity	Heating elements/insulation	Check element continuity; inspect insulation; verify proper tube positioning.

Reset: Power cycle furnace; controller reset procedure if available.

Service: 1-800-873-5658; www.lindbergfurnaces.com