1200°C High-Vacuum Tube Furnace

describe

Designed for precision thermal processing, this 1200°C high-vacuum tube furnace offers excellent temperature uniformity, reliable vacuum performance, and accurate programmable control for research and industrial applications.

Product Features

Pressure protection

The furnace is equipped with an advanced pressure safety protection system specifically designed to prevent operational hazards caused by blocked exhaust ports, closed gas outlets, or excessive pressure buildup inside the furnace tube. The system continuously monitors internal pressure using a high-precision electrical contact pressure gauge or pressure sensor, ensuring real-time detection of abnormal pressure conditions during operation.
When the monitored pressure exceeds the preset safety threshold, the sensor immediately sends a signal to the intelligent control module. The control system automatically closes the electromagnetic gas intake valve to stop further gas inflow while simultaneously opening the electromagnetic exhaust valve to rapidly release excess pressure. At the same time, an audible and visual alarm is activated to alert operators of the abnormal condition, enabling immediate corrective action.
This fully automated protection mechanism effectively prevents damage to the furnace tube, sealing components, and gas control system caused by overpressure conditions. It also minimizes the risk of process interruption, equipment failure, and safety incidents during high-temperature or vacuum atmosphere operations.
By integrating real-time pressure monitoring, automatic pressure relief, and alarm functions into a single intelligent safety system, the furnace achieves enhanced operational reliability and process security. This design is particularly beneficial for applications involving controlled atmospheres, vacuum processing, material synthesis, heat treatment, and laboratory research, where stable pressure conditions and equipment protection are critical for achieving consistent and repeatable results.

Refractory materials

The furnace lining is constructed from vacuum-formed high-purity alumina lightweight insulation material, providing exceptional thermal performance and long-term durability in demanding high-temperature environments. This advanced refractory structure is specifically engineered to reduce heat loss while maintaining excellent temperature uniformity throughout the furnace chamber.
Areas subjected to frequent material loading, unloading, and mechanical stress—such as the furnace opening and furnace bottom—are reinforced with lightweight hollow alumina plates. These high-strength components improve structural stability and wear resistance while maintaining excellent thermal insulation properties. The combination of lightweight construction and superior mechanical strength enhances furnace reliability and extends service life.
The high-purity alumina insulation material offers outstanding resistance to elevated temperatures and possesses extremely low heat storage characteristics, allowing the furnace to respond rapidly to temperature changes. Its excellent resistance to thermal shock enables repeated rapid heating and cooling cycles without cracking, deformation, or structural damage. Unlike conventional refractory materials, it does not produce slag shedding or particle contamination, helping maintain a clean furnace environment and improving product quality.
In addition to its superior thermal performance, the insulation system delivers excellent heat preservation capabilities, significantly reducing energy consumption during operation. Compared with traditional electric furnace structures, the advanced insulation design achieves energy savings of more than 80%, lowering operating costs while improving heating efficiency.
This combination of high-temperature resistance, thermal shock stability, lightweight construction, contamination-free performance, and exceptional energy efficiency makes the furnace ideal for laboratory research, material development, heat treatment, sintering, and precision thermal processing applications.

Protect

The furnace is equipped with an advanced integrated modular control system designed to deliver exceptional temperature control accuracy, operational stability, and long-term reliability. By integrating key control functions into a unified modular architecture, the system reduces electrical complexity, improves response speed, and enhances overall control precision throughout the heating process.
To ensure safe and reliable operation, the furnace adopts a dual-loop control and dual-loop protection design. This intelligent architecture continuously monitors operating conditions and automatically adjusts system performance to maintain stable temperature regulation. The dual-loop configuration provides faster response to process changes and improves temperature consistency, making it suitable for demanding laboratory and industrial heat-treatment applications.
Comprehensive protection functions are built into the control system to safeguard both the equipment and processed materials. Protection features include overshoot protection, over-adjustment protection, under-adjustment protection, thermocouple breakage detection, phase-loss protection, overvoltage protection, overcurrent protection, and overtemperature protection. These functions work together to prevent abnormal operating conditions and reduce the risk of equipment damage or process interruption.
The system also incorporates current feedback monitoring and soft-start technology. Current feedback continuously verifies electrical operating conditions, ensuring accurate power regulation and stable heating performance. The soft-start function gradually increases power during startup, minimizing electrical shock to heating elements and extending component service life.
By combining intelligent modular control, precise temperature regulation, and comprehensive safety protection, the system provides highly reliable operation, enhanced process stability, improved energy efficiency, and superior protection for critical furnace components. This advanced control solution is ideal for high-temperature research, material development, sintering, heat treatment, and precision thermal processing applications.

Technical parameters

Parameter categories	1200 degrees
model	GWDL-GA
Heating chamber size	150mm diameter * 300mm effective heating zone Furnace tube length 950mm
Furnace tube material	High-purity quartz glass
Voltage	380V

power	6 kW
Maximum operating temperature	1200 degrees
Long-term use temperature Spend	1150 degrees
The control range is	RT-1200 degrees
Temperature sensing element	Thermocouple type K, temperature range 0-1320 degrees Celsius
Heating element installation Location	Furnace tube perimeter
Temperature control accuracy	±1 degree (integrated circuit control, no overshoot)
Furnace temperature uniformity	≤ ±5 degrees (depending on the size of the furnace; large furnaces can use multi-point control) This control method aims to achieve better furnace temperature uniformity.
heating rate	Adjustable from 1 ℃ /h to 15 ℃ /min ( non-linear )
Heating element	High-temperature alloy resistance wire is used as the heating element.
Can open atmosphere	It can pass through various gases (oxygen, nitrogen, argon, hydrogen, etc.)
Vacuum component section
vacuum pump	Mechanical pump + molecular pump unit
vacuum degree	≤ 10⁻³ Pa
Pressure testing	One pressure gauge with both positive and negative pressure indicators (a digital vacuum gauge is optional).
valve	Imported stainless steel valves (ordinary, stainless steel, solenoid valves, etc. are available).
Flow meter	Two 0-300 ml / min mass flow meters
Gas pipeline	Clean stainless steel tubing is used for gas applications.
Pressure protection	This system was specifically designed to prevent hazards caused by closed or blocked furnace tube exhaust ports, or excessive furnace tube pressure. Its principle is as follows: a signal from an electrical contact pressure gauge or pressure sensor drives the control module to close the electromagnetic intake valve and activate the electromagnetic exhaust valve and alarm. This protects the electric furnace's normal operation. run
Furnace door opening method	upper and lower hinges open and close
Furnace body	The furnace body is machined using CNC machine tools, and undergoes polishing, grinding, pickling, phosphating, powder coating, and high-temperature baking. It features a two-tone design, a novel and attractive appearance, and possesses advantages such as oxidation resistance, acid and alkali resistance, corrosion resistance, high-temperature resistance, and easy cleaning.
Furnace body structure	The electric furnace body adopts a double-layer air-cooled structure. Effective air-cooling guide baffles ensure overall cold air circulation within the furnace shell, ultimately cooling the conductive plates of the heating elements before they are discharged from the furnace body, thus preventing high-temperature oxidation of the conductive plates and guaranteeing a good working environment.
Refractory materials	The furnace lining is made of vacuum-formed high-purity alumina lightweight material. Areas prone to material handling (furnace opening, furnace bottom) utilize lightweight hollow alumina plates. This material offers high operating temperature, low heat storage, resistance to rapid heating and cooling, no cracking, no slag shedding, and good insulation performance. (The energy-saving effect is more than 80% of that of old-fashioned electric stoves )

thermal insulation materials	It adopts a three-layer insulation system, consisting of aluminum silicate fiberboard, alumina fiberboard, and alumina (polycrystalline) fiberboard, achieving an energy-saving effect of over 80% compared to traditional electric furnaces .
Furnace shell temperature	For long-term use without shutting down the furnace, the outer casing temperature should be less than 45 degrees Celsius .
Protect	The system employs an integrated modular control unit, ensuring accurate control precision. It also features dual-loop control and dual-loop protection, providing protection against overshoot, over-adjustment, under-adjustment, thermocouple breakage, phase loss, overvoltage, overcurrent, overtemperature, current feedback, and soft start.
control	Employing closed-loop technology with thyristor module trigger control, phase-shift trigger control , or zero-crossing triggering, the output voltage, current, or power is continuously adjustable, exhibiting constant voltage, constant current, or constant power characteristics. The current loop is the inner loop, and the voltage loop is the outer loop. When a sudden load is applied or the load current exceeds the current limit, the output current of the voltage regulator is limited within the rated current range, ensuring normal operation of the output and the voltage regulator. Simultaneously, the voltage loop also participates in regulation, limiting the output current of the voltage regulator within the rated current range, maintaining constant output current and voltage with sufficient adjustment margin; thus achieving protection. The heating element avoids excessive current and voltage surges, achieving a safe and reliable control effect and control accuracy.
Display parameters	Temperature, temperature range number, time period, remaining time, output power percentage, electricity Voltage, current, etc.
Button	It uses imported buttons with a lifespan of over 100,000 cycles and comes with an LED indicator.
Temperature profile setting	Employs an intelligent temperature controller, equipped with standard PID , AI-controlled APID , or MPT. It features multiple adjustment modes, self-tuning and self-learning functions, excellent control characteristics with no overshoot and no undershoot, 30- segment programmable control, and can achieve arbitrary slope temperature rise and fall control. It has programmable / operable commands such as jump (loop), run, pause, and stop, and allows modification of the program at any time during program operation. Employing an artificial intelligence adjustment algorithm with curve fitting capabilities, it can achieve smooth... Smooth curve control effect;
Multiple curve inputs	Group 1 has 50 segments, Group 2 has 24 segments, and Group 3 has 16 segments .
Computer Interface	RS485 RS232 USB
Random accessories	Two heating elements, two sets of rods, one instruction manual, one certificate of conformity, tubular electric... One road-specific crucible, two heat insulation plugs, and two sealing rings.
Includes main accessories	The above prices include vacuum flanges, water-cooled flanges, vacuum pumps, and standard pressure gauges, but do not include gas. Gas control and air conditioning are customized according to customer requirements.
Warranty coverage and period	The electric furnace is covered by a one-year free warranty (excluding heating elements and furnace tubes); the temperature controller, thermocouple , regulator, transformer, and voltage regulator are covered by a two-year free warranty; and the heating element will be replaced free of charge if it fails naturally within three months.
Shipping Information
1. The electric furnace is packaged in three layers: first wrapped in foam paper, then wrapped in plastic film, and finally packed in a wooden crate.
2. Free domestic door-to-door delivery (free delivery within city limits)
3. We will be responsible for any damage that occurs during the transportation of the electric furnace.
4. Logistics methods: Road, rail, ship (foreign trade export), air (foreign trade export) transportation; distance... For nearby locations, our company will arrange dedicated transportation (packaging includes wooden pallets and cardboard boxes).

Application areas

Ideal for vacuum heat treatment, annealing, and sintering processes requiring precise temperature and atmosphere control.
Suitable for advanced ceramics, battery materials, powder metallurgy, and semiconductor material research applications.
Widely used in universities, research institutes, and industrial laboratories for thermal processing and material development.

Why Choose Us

Advanced integrated control system ensures high precision, stable temperature control, and reliable long-term operation performance.
Dual-loop protection design provides full safety against electrical faults, temperature errors, and abnormal operating conditions.
Professional customization and strong technical support meet diverse laboratory and industrial high-temperature processing needs.

FAQ

Q1: What control system does the furnace use?
A: It uses an integrated modular control system with dual-loop control for high precision and stable operation.

Q2: What safety protections are included?
A: The system includes protection against overtemperature, overcurrent, thermocouple failure, phase loss, and voltage issues.

Q3: Is the furnace suitable for vacuum applications?
A: Yes, it is designed for high-vacuum tube processing with stable sealing and reliable pressure control performance.

Q4: What materials can be processed in this furnace?
A: It is suitable for ceramics, powder metallurgy, semiconductor materials, and advanced material research.

Q5: Does the furnace support soft start function?
A: Yes, it features soft-start control to protect heating elements and improve system lifespan and stability.