Product Overview
The ITM-LAB GDW Series High and Low Temperature Test Chamber provides controlled high- and low-temperature environments for reliability testing, product validation, environmental simulation, and quality control.
Available in 100L to 1000L capacities with -40°C or -70°C low-temperature configurations, the GDW Series can be selected according to specimen size, temperature range, test profile, and laboratory requirements.
| Temperature Range | Capacity | Heating Rate | Cooling Rate | Uniformity |
|---|---|---|---|---|
| -40°C / -70°C to +150°C | 100–1000L | ≥3°C/min | ≥1°C/min | ≤2.0°C |
Key Features
- Temperature fluctuation: ±0.5°C
- Temperature deviation: ≤±1°C
- 7-inch programmable touchscreen controller
- USB data export
- Programmable test profiles
- Multiple equipment protection functions
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Typical Applications
The GDW Series is used for high- and low-temperature testing across consumer electronics, automotive, electronic components, energy storage, engineering materials, and industrial products, supporting R&D, reliability verification, environmental qualification, and quality control.
| Consumer Electronics | Automotive Electronics | Electronic Components |
|---|---|---|
| Smartphones · Tablets · Displays · Wearables · Chargers · Connectors | ECUs · Sensors · Switches · Connectors · Control Modules · Electrical Components | PCBs · Relays · Sensors · Switches · Connectors · Electronic Modules |
| Batteries & Energy Storage | Plastics & Engineering Materials | Industrial & Electrical Products |
| Battery Components · Modules · BMS · Electronic Systems | Plastics · Rubber · Insulation Materials · Coatings | Instruments · Controllers · Electrical Assemblies · Precision Components |
Battery Testing Note: Battery applications should be evaluated according to specimen type and required safety configuration.
GDW Model Selection & Dimensions
Six standard chamber capacities are available from 100L to 1000L.
Small to Medium Capacity
| Model | GDW-100L-B/C | GDW-150L-B/C | GDW-225L-B/C |
| Volume | 100L | 150L | 225L |
| Internal Size (W×D×H) | 400×500×500 mm | 500×500×600 mm | 500×600×750 mm |
| External Size (W×D×H) | 650×1670×1250 mm | 750×1770×1250 mm* | 750×1850×1500 mm |
| Weight | Approx. 200 kg | Approx. 260 kg | Approx. 300 kg |
| Power | AC 220V / 3 kW | AC 380V / 4.5 kW | AC 380V / 5.5 kW |
High Capacity
| Model | GDW-408L-B/C | GDW-800L-B/C | GDW-1000L-B/C |
| Volume | 408L | 800L | 1000L |
| Internal Size (W×D×H) | 600×800×850 mm | 1000×800×1000 mm | 1000×1000×1000 mm |
| External Size (W×D×H) | 800×1700×2020 mm | 1250×1700×2170 mm | 1250×1900×2170 mm |
| Weight | 400 kg | 600 kg | 700 kg |
| Power | AC 380V / 7.5 kW | AC 380V / 10 kW | AC 380V / 11 kW |
*Final dimensions should be confirmed according to the ordered configuration.
How to Select
Choose the chamber according to:
Temperature Range → Specimen Size → Specimen Weight → Fixture Space → Heat Load → Test Standard
Chamber volume alone should not determine model selection. Sufficient internal space should be reserved for specimen fixtures, wiring, and airflow circulation.
Performance & IEC Standards
Performance Specifications
| Item | Specification |
| Temperature Range | -40°C to +150°C or -70°C to +150°C |
| Temperature Fluctuation | ±0.5°C |
| Temperature Deviation | ≤±1°C |
| Temperature Uniformity | ≤2.0°C |
| Heating Rate | ≥3°C/min |
| Cooling Rate | ≥1°C/min |
| Heating/Cooling Overshoot | ≤2°C |
| Maximum Shelf Load | 20 kg |
| Noise | ≤70 dB(A) |
Test condition: Performance values refer to an air-cooled ambient temperature of +5°C to +25°C, relative humidity ≤85%, under no-load conditions. Heating and cooling rates are total-average, non-linear values.
Test Standards
IEC 60068-2-1:2025 — Low Temperature Test
IEC 60068-2-2:2007 — High Temperature Test
IEC 60068-2-78:2007 — Damp Heat, Steady State
IEC 60068-2-30:2005 — Damp Heat, Cyclic
Applicability of humidity-related test methods depends on the selected chamber configuration.
Chamber Construction & Airflow
The GDW Series uses a SUS304 stainless-steel inner chamber, insulated enclosure, heated observation window, and forced-air circulation system for stable environmental testing.
Chamber Construction
| Component | Configuration |
| External Chamber | Cold-rolled steel with electrostatic coating |
| Inner Chamber | SUS304 stainless steel |
| Insulation | Hard polyurethane foam + ultra-fine glass fiber |
| Door | Single left-opening door |
| Observation Window | 300×400 mm, 3-layer vacuum glass |
| Anti-Condensation | Automatic electric window/frame heating |
| Test Port | Ø50 mm or Ø100 mm, 1 standard |
| Glove Holes | Optional |
| Sample Racks | 2 standard |
| Door Seal | High-temperature-resistant silicone |
| Pressure/Drain Port | 1/2-inch shared type |
| Internal Light | 9W LED |
| Communication | USB standard; RS-232 / Crystal Head optional |
Air Circulation
The chamber uses an:
Upper Air Discharge → Test Space → Lower Air Return
airflow configuration.
A multi-wing centrifugal circulating fan with high- and low-temperature-resistant aluminum alloy blades continuously circulates conditioned air through the test space.
Temperature measurement uses a PT100 platinum resistance sensor.
Refrigeration, BTHC & Heating System
Refrigeration System
The refrigeration system is configured according to chamber capacity, temperature range, and actual test conditions.
| Component | Configuration |
| Compressor | Tecumseh / Hitachi / Bitzer or equivalent |
| Refrigerant | R404A / R23 depending on configuration |
| Condenser | Air-cooled forced-convection fin type |
| Evaporator | Multi-stage finned evaporator |
| Oil Separator | Henry |
| Expansion Valve | Danfoss |
| Solenoid Valve | Danfoss or equivalent |
| Sight Glass | Danfoss |
BTHC Control
The system adopts Balanced Temperature and Humidity Control (BTHC) regulation.
Refrigeration flow is automatically adjusted according to operating conditions. During constant-condition stages, unnecessary refrigeration output can be reduced while maintaining temperature control.
A multi-stage evaporator configuration improves cold-volume exchange, while thermal expansion valves automatically regulate refrigerant flow.
Heating System
The heating system uses nickel-chromium alloy electric heating elements with high-precision contactless control through SSR solid-state relays.
[IMAGE — Refrigeration + BTHC + Heating System]
Programmable Controller & Safety Protection
7-Inch Programmable Controller
| Function | Specification |
| Display | 7-inch TFT LCD, 800×480 |
| Operation | Resistive touchscreen / USB mouse |
| Programs | Up to 100 groups |
| Program Segments | Up to 999 |
| Cycles | Up to 999 |
| Control | PID + SSR/SCR |
| Data Recording | Up to 300 days of 24H operation records |
| Export | CSV |
| Standard Interface | USB |
| Communication | RS-232 / RS-485 / Crystal Head |
| Scheduled Start | Supported |
| PC Control | Remote monitoring/control software |
The controller can generate temperature and humidity curves, export historical data, provide timing output signals, and display fault information and troubleshooting guidance.
Two timing-output interfaces with 10 timing-control modes are available.
Timing outputs provide control signals only. Power for specimens operating inside the chamber must be supplied separately.
Safety Protection
The GDW Series includes:
- Compressor overheat, overcurrent, and overpressure protection
- Condenser fan overheat protection
- Adjustable chamber over-temperature protection
- Chamber temperature fuse
- Air-channel limit over-temperature protection
- Circulation fan motor overheat protection
- Phase-loss protection
- Leakage protection
- Overload and short-circuit protection
- Main power no-fuse protection switch
- Controller power lightning protection
- Independent specimen over-temperature protection
Installation, FAQ & ITM-LAB
Installation Requirements
| Requirement | Specification |
| Ambient Temperature | 5°C–35°C |
| Relative Humidity | ≤85% RH |
| Atmospheric Pressure | 80–106 kPa |
| Frequency | 50±0.5 Hz; 60 Hz supported |
| Clearance | ≥600 mm left, right, and rear |
The installation environment should be free from strong vibration, excessive dust, flammable or explosive gases, corrosive gases, and strong electromagnetic radiation.
Do not place flammable, explosive, volatile, or highly corrosive substances inside the chamber unless the equipment has been specifically configured for the application.
FAQ
- What is the difference between the -40°C and -70°C configurations?
The main difference is the low-temperature capability and corresponding refrigeration configuration. The appropriate option should be selected according to the required test profile.
- Which GDW chamber size should I choose?
Consider the specimen dimensions, quantity, fixture space, airflow clearance, specimen weight, and heat load. Chamber volume alone should not determine the final model.
- What does ≥3°C/min heating rate mean?
It is a total-average, non-linear chamber-air heating rate under no-load conditions, not a guaranteed linear specimen temperature-change rate.
- Can a powered specimen be tested inside the chamber?
Yes, depending on the application and configuration. Wiring can pass through the chamber access port, but specimen power must be supplied separately and specimen heat generation should be considered during chamber selection.
- How much installation space is required?
Reserve at least 600 mm on the left, right, and rear sides of the chamber for ventilation, heat dissipation, and maintenance.
Why ITM-LAB?
Established in 1998, ITM-LAB develops and manufactures reliability and environmental testing equipment for laboratories and manufacturers.
We provide chamber configuration support according to the customer's:
Temperature Range · Specimen Size · Specimen Weight · Heat Load · Test Standard · Power Supply
Need Help Selecting a GDW Model?
Send us your required temperature range, specimen dimensions, specimen weight, test profile, applicable standard, and local power supply.
Our engineers can recommend an appropriate GDW configuration for your application.
