Programmable Temperature and Humidity Test Chamber for Environmental Reliability Testing | SN881-G3350
The SN881-G3350 is an environmental test chamber designed for programmable temperature and humidity testing of electronic components, electrical appliances, plastics, raw materials, and other industrial products.
With a temperature range of -40°C to +75°C, a humidity range of 20%–98% RH, and a 1500 × 1500 × 1500 mm workspace, it supports reliability evaluation under cold, dry heat, steady-state damp heat, and cyclic damp heat conditions.
Environmental Testing Solution Overview
Products may encounter low temperatures, elevated temperatures, or humid environments during manufacturing, storage, transportation, and use. These conditions can affect material stability, electrical performance, insulation characteristics, dimensional behavior, and overall product reliability.
The SN881-G3350 Programmable Temperature and Humidity Test Chamber creates controlled environmental conditions for evaluating these effects before a product is released or placed into service. It is suitable for manufacturing quality departments, product development teams, inspection organizations, and testing laboratories that need repeatable environmental test programs.
The chamber combines a PLC-based intelligent control system, a 7-inch color touchscreen, programmable and fixed-value operating modes, and an air-cooled cascade refrigeration system. Operators can configure test segments, cycle conditions, and monitor real-time temperature and humidity curves from the controller.
Typical Application Scenarios
1. Electronic Components and Assemblies
Electronic parts and assemblies can be exposed to temperature changes and moisture during storage, transport, and operation. The chamber can be used to evaluate their environmental reliability under controlled cold, dry heat, and damp heat conditions.
Typical test samples include electronic components, assembled electrical parts, connectors, and sensors, provided that they do not create an active heat load exceeding the chamber's specified operating conditions.
2. Household and Industrial Electrical Appliances
Electrical products may require environmental testing to verify performance and stability under different climatic conditions. Programmable profiles allow laboratories and quality teams to reproduce specified temperature and humidity stages in a controlled sequence.
3. Automotive Electrical Components
The chamber can be applied to environmental testing of automotive electrical parts, connectors, and sensors. Its large internal workspace is useful when testing multiple samples or components that require additional installation space.
4. Plastics, Rubber, and Raw Materials
Temperature and humidity exposure may affect the physical stability of plastics, rubber products, and industrial raw materials. The SN881-G3350 supports controlled conditioning and environmental exposure for comparison, inspection, and reliability evaluation.
5. Quality Inspection and Laboratory Testing
Testing laboratories can use the chamber for standardized cold, dry heat, steady-state damp heat, and cyclic damp heat methods. Programmable operation helps reduce repeated manual adjustment during multi-stage or cyclic tests.
| Application Area | Typical Samples | Testing Purpose |
|---|---|---|
| Electronics | Components and assemblies | Evaluate reliability under controlled temperature and humidity exposure |
| Electrical appliances | Household and industrial electrical products | Assess performance and stability under climatic conditions |
| Automotive components | Electrical parts, connectors, and sensors | Perform environmental exposure and reliability testing |
| Plastics and rubber | Material specimens and finished parts | Assess material stability under temperature and humidity conditions |
| Raw materials | Industrial material samples | Evaluate behavior during environmental exposure |
| Testing laboratories | Products and material specimens | Conduct cold, dry heat, cyclic damp heat, and steady-state damp heat tests |
Supported Environmental Test Methods
The SN881-G3350 is designed for environmental testing according to the following standards and methods:
| Standard | Test Method | Environmental Condition |
|---|---|---|
| IEC 60068-2-1:2007 | Test Ab | Cold test |
| IEC 60068-2-2:2007 | Test Bb | Dry heat test |
| IEC 60068-2-30:2005 | Test Db | Damp heat, cyclic |
| IEC 60068-2-78:2007 | Test Cab | Damp heat, steady state |
Users should select the required test profile, exposure duration, sample arrangement, and acceptance criteria according to the applicable product standard or internal testing procedure.
Key Capabilities for Environmental Testing
Programmable Multi-Stage Testing
The 7-inch color touchscreen controller supports both program and fixed-value modes. Up to 120 program groups and 12,000 segments in total can be configured for multi-stage environmental testing.
Adjustable segments and cycle settings allow users to create sequences involving temperature, humidity, exposure time, and repeated cycles within the chamber's specified operating range.
Real-Time Process Monitoring
The controller displays real-time temperature and humidity curves, helping operators monitor chamber conditions throughout the test. Upper and lower limit alarms support timely identification of abnormal conditions.
Automatic Recovery After Power Interruption
Program memory and automatic restart functions allow the control system to retain the programmed process and resume operation after power recovery.
Large Stainless Steel Workspace
The 1500 × 1500 × 1500 mm internal chamber provides space for larger samples or multiple specimens. Its brushed SUS #304 stainless steel interior supports durability and routine cleaning.
Observation and Cable Access
A three-layer vacuum tempered-glass window provides a direct view of the workspace. Internal lighting improves sample visibility, while the standard φ50 mm cable lead hole allows external test wiring or monitoring connections to pass into the chamber.
Stable Air Circulation
Four stainless steel long-axis centrifugal fans circulate conditioned air within the workspace. This arrangement supports the chamber's specified temperature and humidity control performance.
Technical Specifications
| Item | Specification |
|---|---|
| Model | SN881-G3350 |
| Control system | PLC and touchscreen intelligent control system |
| Internal size (W × H × D) | 1500 × 1500 × 1500 mm |
| External size (W × H × D) | 1750 × 2050 × 2800 mm |
| Weight | Approximately 1,050 kg |
| Temperature range | -40°C to +75°C |
| Humidity range | 20%–98% RH |
| Temperature fluctuation | ±0.5°C |
| Humidity fluctuation | ≤2.5% |
| Temperature deviation | ≤±2.0°C |
| Humidity deviation | ≤±3% |
| Heating rate | ≥2–3°C/min |
| Cooling rate | ≥1°C/min, average, no load |
| Operating noise | ≤70 dB(A) |
| Heating power | Approximately 6 kW |
| Power supply | AC 380 V, three-phase four-wire plus protective ground wire |
| Power capacity | Approximately 22 kW |
| Maximum current | 50 A |
| Power switch | 63 A molded-case leakage protector |
Humidity operating note: The available temperature and humidity combinations are subject to the specified controllable range diagram. The supplied specification identifies a humidity control range of 20%–98% RH at temperatures from 20°C to 85°C; however, the SN881-G3350 chamber's stated maximum temperature is +75°C. Performance specifications apply without an active heat load.
Control and Communication Functions
| Function | Practical Use |
|---|---|
| Program mode | Runs multi-stage and cyclic temperature and humidity profiles |
| Fixed-value mode | Maintains a selected environmental condition |
| 120 program groups | Stores multiple test procedures |
| 12,000 total segments | Supports detailed test sequences |
| Real-time curves | Displays temperature and humidity changes during operation |
| Cycle configuration | Allows selected program stages to be repeated |
| Program memory and restart | Supports automatic recovery after power is restored |
| RS232 / RS485 interface | Provides a communication connection for compatible external systems |
| Upper and lower limit alarms | Warns operators when set control limits are exceeded |
| PID control | Includes automatic parameter calculation for environmental control |
Refrigeration and Conditioning System
The chamber uses an air-cooled mechanical compression, two-stage cascade refrigeration system. It is equipped with U.S.-made Copeland low-temperature, low-noise scroll compressors.
A Swedish-made SWEP refrigerant heat exchanger constructed from SUS 316 stainless steel is used for heat exchange. The refrigeration configuration also includes AC&R double-spoiler-type aluminum fin condensers and evaporators, imported refrigeration accessories, and Honeywell R404A refrigerant.
Heating is provided by a fin-type stainless steel electric heater. Together with the air circulation and control systems, this configuration supports programmed high-temperature, low-temperature, and humidity testing within the chamber's stated specifications.
Chamber Construction and Standard Configuration
| Component | Configuration |
|---|---|
| Outer wall | A3 board with sprayed finish |
| Inner wall | Brushed SUS #304 stainless steel |
| Insulation | 100 mm high-temperature-resistant rigid polyurethane foam |
| Observation window | 400 × 600 × 40 mm, three-layer vacuum tempered glass |
| Chamber door | Single outward-opening door with safety locking mechanism |
| Door heating | Electric anti-condensation heating |
| Internal lighting | Energy-saving lamp |
| Cable lead hole | φ50 mm, one piece |
| Air circulation | Four stainless steel long-axis centrifugal fans, 90 W each |
| Heater | Fin-type stainless steel electric heater |
Safety Protection
The SN881-G3350 incorporates protection functions for the refrigeration system, temperature control, electrical system, and chamber operation. These include:
- Compressor overheating protection
- Compressor overcurrent protection
- Compressor overpressure protection
- Chamber over-temperature protection
- Fan motor overheating protection
- Leakage protection
- Electrical overload protection
- Short-circuit protection
Sample restriction: The chamber must not be used to test or store flammable, explosive, volatile, corrosive, biological, or strong electromagnetic radiation-emitting samples.
Site Preparation and Installation Requirements
Appropriate site conditions are necessary for stable operation, heat dissipation, drainage, and routine maintenance. The installation area should satisfy the following requirements:
| Installation Item | Requirement |
|---|---|
| Ambient temperature | 5°C–35°C |
| Ambient relative humidity | ≤85% |
| Air pressure | 86–106 kPa |
| Ground bearing capacity | ≥800 kg/m² |
| Drainage | A floor drain should be available within 2 meters of the refrigeration unit |
| Water supply | Purified water must be used; tap water must be treated before use |
| Ventilation | Sufficient ventilation must be provided |
| Maintenance clearance | Adequate access space must be reserved around the equipment |
Before installation, users should also confirm that the site can accommodate the chamber's external dimensions of 1750 × 2050 × 2800 mm, its approximate weight of 1,050 kg, and the specified AC 380 V electrical supply.
Choosing the SN881-G3350 for Your Test Program
This model is suited to applications that require:
- A large 1500 mm cubic internal workspace
- Cold testing down to -40°C
- High-temperature testing up to +75°C
- Controlled humidity testing within the specified operating diagram
- Programmable multi-stage or cyclic test profiles
- Fixed-value environmental conditioning
- Real-time temperature and humidity curve monitoring
- Cable access for externally connected sample monitoring
- Testing based on applicable IEC 60068 environmental methods
When selecting a chamber, the test sample dimensions, sample quantity, active heat load, required temperature and humidity points, transition rates, exposure duration, power supply, drainage, and installation environment should all be reviewed against the equipment specification.
Frequently Asked Questions
What types of environmental tests can the SN881-G3350 perform?
It is designed for cold, dry heat, steady-state damp heat, and cyclic damp heat testing within its specified temperature and humidity operating ranges.
What is the chamber's working temperature range?
The specified temperature range is -40°C to +75°C.
Can 20%–98% RH be set at every temperature?
No. Available temperature and humidity combinations are subject to the chamber's controllable range diagram. The specified humidity range should not be interpreted as available at every temperature point.
Can the chamber run cyclic test programs automatically?
Yes. The controller supports program segments, cycle settings, up to 120 program groups, and 12,000 segments in total.
Can samples be connected to external measuring equipment?
The chamber includes one standard φ50 mm cable lead hole that can be used to route compatible test wiring or monitoring connections.
What water should be used for humidity testing?
Purified water must be used. Tap water must be treated before it is supplied to the equipment.
Does the stated cooling rate apply with samples inside the chamber?
The specified average cooling rate of at least 1°C/min is stated for no-load operation. Actual performance should be assessed according to the sample condition and test setup.
Which IEC standards are listed for this chamber?
The listed methods are IEC 60068-2-1:2007 Test Ab, IEC 60068-2-2:2007 Test Bb, IEC 60068-2-30:2005 Test Db, and IEC 60068-2-78:2007 Test Cab.
Discuss Your Environmental Testing Application
Sinuotek provides temperature and humidity environmental testing equipment for product reliability evaluation, quality inspection, and laboratory applications.
Contact Sinuotek to discuss your sample dimensions, required temperature and humidity profile, applicable test method, installation conditions, and quotation requirements for the SN881-G3350.
- Website: https://www.sinuotek.com
- Email: sales@sinuotek.com
- Phone / WeChat / WhatsApp: +86 13527656435