Large muffle furnace 14 liter up to 1200 °C with four heating elements

The Thermo Scientific Thermolyne premium large muffle furnace combines a spacious 14 liter working chamber with advanced temperature control up to 1200 °C. As a result, this model suits laboratories that need both larger sample volumes and high temperature precision. Specifically, stability is ± 0.3 °C and uniformity is ± 2.2 °C at 1000 °C, considerably more accurate than smaller benchtop variants. Furthermore, built-in safety systems and a Platinel II thermocouple ensure reliable performance during extended operation at high temperatures.

Four heating elements for superior uniformity

The most distinctive feature of this large muffle furnace is the four-heating-element configuration. Specifically, elements are placed on the top, bottom, and sides of the chamber, rather than only on the sidewalls as in simpler models. As a result, heat distributes evenly across the entire sample volume, with uniformity of ± 2.2 °C at 1000 °C. Notably, this configuration prevents hotspots and cold zones, which is critical for gravimetric analysis and reproducible thermal treatments.

Three controller choices for your process

Specifically, you choose from three PID microprocessor controllers depending on the complexity of your application:

• F6020C-33 (B1): Single setpoint with ramp to setpoint and dwell function. Specifically suitable for controlled heatup curves with a hold period. Includes mechanical OTP relay for over-temperature protection.
• F6020C-33-80 (C1): Programmable with 1 stored program of 8 segments, including OTP relay. As a result, more complex thermal profiles become possible, for example stepwise heating followed by controlled cooldown.
• F6030CM-33 (D1): Programmable with 5 stored programs of 16 segments each, plus RS-232 communications and OTP relay. In addition, suitable for labs that want to log data or remotely monitor from a PC.

Furthermore, all three models feature a Platinel II thermocouple, suited for extended operation at temperatures up to 1400 °C.

Applications in lab and industry

Specifically, this large muffle furnace is found in laboratories working with larger sample volumes or processing multiple samples at once. Common applications include:

• Gravimetric analysis and ashing of larger samples
• Sintering and bonding processes for ceramics, metal, and glass
• Heat treatment, annealing, and tempering of metal
• Pyrolysis and thermal decomposition
• Calibration and crystal growth
• Thermal expansion and viscosity testing

In addition, this model is used in pharmaceutical development, materials research, and the food industry for combustion analysis of additives and residues.

Safety and operation

Moreover, this large muffle furnace features multiple safety layers. Specifically, the door switch interrupts power to the heating elements when the door opens. Furthermore, thermocouple break protection cuts heating when a sensor fails, which prevents uncontrolled temperature rise. Notably, the mechanical OTP relay provides an independent layer of overheating protection. In addition, the built-in vent port removes fumes and moisture directly, extending the life of elements and the unit. Specifically, a 0.8 cm diameter port at the rear allows independent temperature measurement.

Standard and optional accessories

Each premium large muffle furnace ships with a Platinel II thermocouple, mechanical OTP relay, and hearth tray. As a result, the unit is immediately ready for applications up to 1200 °C without additional investment. Furthermore, a stainless steel shelf is optionally available (SH408X1, rated up to 900 °C), which doubles load capacity by allowing two sample levels. In addition, a set of hearth trays (PHX1, up to 9 pieces in a 3 × 3 pattern) and a stainless steel exhaust kit (AY408X1A, 2.5 inch ID, 5 ft length) are available.

Note: all EU models require hardwiring by a qualified technician. Specifically, no plug or power cord is supplied, because the 4400 W power demands a fixed electrical connection.