800°C Ind. Heat Treat Furnace Energy Saving PID Control

describe

Max temp 800°C, energy-saving fiber insulation, stainless steel heating elements, PID precise control, box-type design, durable and safe.

Product Features

Furnace material

The 800°C industrial heat treat furnace represents a significant advancement in thermal processing technology, combining vacuum-formed lightweight alumina fiber lining with intelligent PID control to deliver exceptional energy efficiency and precise temperature management. The furnace lining is entirely constructed from high-purity alumina fiber material produced through vacuum forming, which provides high operating temperature capability, remarkably low heat storage capacity, excellent thermal shock resistance, and superior insulation performance. When compared with traditional refractory brick-lined electric furnaces, this innovative lining design achieves an energy-saving improvement of more than 60%, substantially reducing electricity consumption and operational costs over the equipment's lifespan.
The heating system utilizes high-quality stainless steel tubular heating elements strategically positioned to ensure uniform temperature distribution across the entire chamber. An advanced PID controller paired with a solid-state relay enables precise temperature regulation within ±1°C accuracy, supporting programmable heating ramps, soaking periods, and cooling phases for complex heat treatment cycles such as annealing, quenching, tempering, and stress relieving. The double-layer steel shell with forced air cooling effectively minimizes external surface temperature, enhancing workplace safety and reducing ambient heat loss. Built-in over-temperature alarm and automatic power-off protection safeguard both the workpiece and the furnace itself against abnormal conditions.
This box-type resistance furnace offers customizable chamber dimensions to accommodate various part sizes and production volumes, making it suitable for a wide range of industries including machinery manufacturing, automotive component processing, mold and die making, hardware tools, and general metalworking. Operators benefit from an intuitive digital display that allows easy monitoring and parameter adjustment, while the robust construction and reliable components ensure long service life with minimal maintenance requirements. By integrating energy-saving fiber insulation, precise PID control, and comprehensive safety features, the 800°C industrial heat treat furnace delivers consistent metallurgical results and measurable cost savings for any thermal processing application.

cooling system

The directional air-cooling circulation system is specifically designed to address the challenges of uneven heat dissipation and excessive surface temperature in industrial heat treatment equipment. Unlike conventional cooling approaches that rely on passive or random airflow, this system creates a guided, forced-convection loop that actively directs cool air from the cold zone toward the hot zone, then exhausts heated air efficiently. By employing strategically placed high-performance fans, optimized duct channels, and adjustable airflow deflectors, the system eliminates dead zones and prevents hot air recirculation, which commonly plagues standard cooling designs. This targeted circulation ensures that every critical component, including the furnace shell, control cabinets, and heating element terminals, receives consistent cooling regardless of operating load.
One of the key advantages of this directional approach is its ability to reduce external surface temperatures by up to 50% compared to natural convection methods, significantly improving operator safety and extending the lifespan of adjacent electronic components. The system also contributes to overall energy savings because less fan power is required to achieve the same cooling effect when airflow is properly channeled. In addition, the uniform temperature distribution across the furnace exterior minimizes thermal stress and deformation, leading to greater structural integrity over time. Maintenance requirements are reduced due to fewer thermal cycling-induced failures, and the system can be easily integrated into new or existing furnace designs without major modifications. For industries requiring continuous or high-duty-cycle heat treatment, the directional air-cooling circulation system delivers reliable, repeatable, and cost-effective thermal management that directly supports production quality and equipment longevity.

protective system

The integrated protection system for industrial heat treatment furnaces combines six essential safeguards including overheating, overcurrent, overvoltage, phase missing, soft start, and sensor failure protection. Overheating protection utilizes redundant thermocouples and a dedicated limit controller to automatically shut down heating elements when internal temperature exceeds a preset threshold, preventing damage to the furnace lining and workpieces.
Overcurrent and overvoltage protection circuits continuously monitor the electrical supply; if current or voltage spikes beyond safe levels, the system instantly disconnects power input to safeguard transformers, relays, and heating elements from burnout or insulation breakdown. Phase missing detection identifies any interruption in three-phase power and halts operation immediately, avoiding single-phase running that could cause motor or heater damage.
Soft start functionality gradually ramps up heating power during initial startup, reducing inrush current and thermal shock to heating elements and electrical components, thereby extending their service life. Sensor failure protection constantly validates signals from temperature sensors; if a sensor becomes open-circuited, shorted, or drifts out of range, the system defaults to a safe shutdown mode and alerts the operator.
All these protective measures are integrated into a centralized control board with visual indicators and alarm outputs, enabling quick diagnosis and troubleshooting. This comprehensive protection architecture ensures operator safety, product quality, and minimizes downtime and maintenance costs, making it an indispensable feature for any high-reliability industrial heat treatment furnace.

project name

1. Furnace Body & Heating System

Project	Specifications
Model	GWDL-800HX
Furnace dimensions	W1000×D1000×H1000mm
Power supply	AC 415V, 50Hz
Temperature range	Room temperature – 800℃
Temperature sensor	Type K Thermocouple (0–1320°C)
Heating element	High-temperature alloy resistance wire
Heating element arrangement	Evenly distributed on both sides and the bottom of the furnace
Temperature control accuracy	±1℃ (controlled by integrated circuit, no overshoot)
Temperature uniformity	≤ ±5℃ (depending on furnace chamber size)
Hot air circulation system	Top hot air stirring system
Fan motor	0.75 kW
Wind turbine	10.5-inch 310S stainless steel centrifugal impeller
Fan control	Variable frequency drive with stepless speed control
PLC interlock (optional)	Support (fan speed linked with temperature curve)
Insulation material	Multilayer high-purity ceramic fiber board
Furnace lining material	The furnace lining is entirely made of vacuum-formed, high-purity, lightweight alumina fiber material, featuring high operating temperature, low heat capacity, excellent thermal shock resistance, and superior insulation performance. The energy-saving effect is over 60% higher compared to traditional electric furnaces.
Furnace structure	Dual-layer air-cooled structure
Cooling system	Directional air-cooled circulation system
Surface temperature	≤45℃ (continuous operation)
Surface Treatment	CNC machining, polishing, pickling, phosphating, powder coating, high-temperature baking
Structural Features	Antioxidant, acid and alkali resistant, corrosion-resistant, easy to clean
Door opening method	180-degree side-opening axial furnace door

■ 2. Control System & Electrical Parameters

Project	Specifications
Furnace door locking system	Elastic Locking System (Thermal Expansion Compensation)
Sliding system	Bottom guide rail + trolley platform
Sample rack	Refer to the dimensional drawing. Constructed with a 316 stainless steel frame, suitable for long-term use at temperatures up to 700℃.
Control method	Closed-loop SCR phase control
Output mode	Constant voltage / constant current / constant power
Protection system	Over-temperature, over-current, over-voltage, phase loss, start, and sensor fault protection
Control Architecture	Dual-loop (voltage outer loop + current inner loop)
Display parameters	Temperature, program segment number, remaining time, output power%, voltage, current
Push button switch	Imported button (over 100,000 cycles lifespan) with LED indicator
Temperature Controller	Intelligent PID / APID / MPT Self-Learning System
Program capacity	50 segments
Programming Function	Heating / holding, circulation, pause, resume; editable during operation
Multiple curve input	1 curve (50 segments) / 2 curves (each 28 segments) / 3 curves (each 15 segments) / 5 curves (each 9 segments)
Control algorithm	Smooth temperature control algorithm based on AI curve fitting
Communication interface	RS485
Standard accessories	Crucible tongs (1 piece), high-temperature gloves (1 pair)
Warranty period	1 year (excluding heating element)
Heating Element Warranty	Not covered by warranty (free replacement within 3 months for natural damage)

■ 3. HMI / Touch Screen Specifications

Project	Specifications
Touch screen functionality	7-inch TFT true color display
Dimensions	206W × 156H × 50D (mm)
Resolution	800 × 480
Backlight	LED
Power	5W
Weight	1Kg
Language	English (customizable)
Full-screen display and operation	Instrument interface, bar chart, historical trends, data reports, alarm information, data export, process flow, system management, etc.
Control object	Temperature, pressure, flow rate, liquid level, etc.
Control the number of furnaces	1–6 units
Temperature control	Touch screen + high-precision integrated module
Start heating up	Touch operation
Temporary insulation	Touch operation
Stop warming up	Touch operation
Temperature curve programming	Touch operation, 30 segments per curve
Number of temperature curve storage	Infinite (each curve can be named in both Chinese and English)
Real-time status display	Running curve name, segment number, time, segment duration, digital temperature, real-time curve, 100% power output
Segment-specific startup (cross-segment startup)	Touch operation
Curve range	Adjustable
Historical Curve (Graph)	Approximately 20 months of storage
Data Report (Excel)	Approximately 20 months of storage, capable of displaying multiple points simultaneously (expandable via USB drive)
Historical curve and report recording interval (disk storage)	Adjustable from 1 to 3600 seconds, with multi-point simultaneous display (expandable by inserting a USB drive)
Alarm indication	Color change (red)
Alarm message language	English display (alarm time and event description)
Data Export Interface	USB
Printer interface	Parallel port
Touch screen operation protection	Password protection enabled (operations prohibited without password)
Communication port	RS485

Application areas

Metal heat treatment industry for annealing, quenching, tempering, and normalizing of carbon steel, alloy steel, and stainless steel components.
Automotive parts manufacturing for hardening and stress relieving of gears, shafts, bearings, and engine components to improve wear resistance.
Mold and die making industry for preheating, hardening, and tempering of tool steels used in injection molds, stamping dies, and forging tools.

Why Choose Us

Energy saving over 60% with advanced fiber insulation technology.
Precise PID control ensures ±1°C accuracy for consistent results.
Robust safety protections including overtemp, overcurrent, and sensor failure.

FAQ

Q1: What is the maximum operating temperature of the furnace?

A: The furnace operates up to 1200°C (or 1400°C/1600°C depending on the model), ensuring high-temperature uniformity for various industrial processes.

Q2: Does the system support custom configurations?

A: Yes, we offer full customization including chamber sizes, heating element types, and advanced digital control systems to meet specific production needs.

Q3: What safety features are included in the standard package?

A: The system includes comprehensive protection against overheating, overcurrent, phase loss, and sensor failure, ensuring safe operation at all times.

Q4: How energy-efficient is this heat treatment furnace?

A: Utilizing advanced ceramic fiber insulation and high-efficiency heating elements, the furnace significantly reduces power consumption compared to traditional brick-lined models.

Q5: Is technical support and training provided after purchase?

A: Absolutely. We provide lifetime technical support, detailed operation manuals, and on-site installation guidance to ensure seamless integration into your workflow.