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Model
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SN886-25m3
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Sample Restrictions
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This test equipment is prohibited from testing or storing the following samples:
Flammable, explosive, or volatile substances
Corrosive substances
Biological samples
Strong electromagnetic emission sources
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Nominal Volume
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25m3
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Inner Chamber Dimensions
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W2500 × H2500 × D4000 mm
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Outer Chamber Dimensions
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W3550 × H3130 × D4650 mm
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Test Environmental Conditions
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Ambient temperature 5–35°C; relative humidity ≤85%RH; atmospheric pressure (86–106) kPa; chamber empty.
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Applicable Test Standards
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IEC 60068-2-78 Test Cab: Steady-State Damp Heat
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Performance
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Temperature Range
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-30°C to +70°C
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Temperature Fluctuation
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≤ ±0.5°C
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Temperature Deviation
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±2.0°C
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Temperature Uniformity
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2.0°C
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Temperature Rise Time
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+20°C → +85°C ≤ 20 min (no load)
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Temperature Fall Time
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+20°C → -40°C ≤ 60 min (no load)
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Humidity Range (Humidity Type Only)
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Relative Humidity Deviation
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±3%RH (＞75%RH, no load)
±5%RH (≤75%RH, no load)
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Humidity Fluctuation
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±2.5%RH
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Air Velocity (center of chamber)
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0.5–2.0 m/s (frequency adjustable).
All performance indicators must be met at air velocity ≤2.0 m/s.
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Airflow direction
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vertical downward
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Working Heat Load (Heat Dissipation Capacity)
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-40°C to +0°C: ≤2000 W
+0°C to +85°C: ≤6000 W
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Structural Features
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Thermal Insulation Structure
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Composite modular panels consisting of:
Powder-coated galvanized steel (outer panel) → Thermal insulation material → SUS304 stainless steel (inner panel)
Outer panel: A3 cold-rolled steel, thickness ≥1.0 mm, HOHUXI standard color
Inner panel: SUS304, thickness ≥1.0 mm; floor with embossed anti-slip stainless steel
Insulation thickness: ≥100 mm
Floor load capacity: 1000 kg/m² (uniform load)
Floor: SUS304 embossed anti-slip steel plate, thickness 2.5 mm
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Air Conditioning Channel
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Centrifugal fans: ≥4 units
Heater, evaporator (also for dehumidification), water inlet/outlet, dry-bulb sensor
Humidity type chamber additionally includes: humidifier, anti-dry-burn protection
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Standard Configuration
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Cable ports: φ100 mm × 2 (left side), with caps and silicone plugs
Lighting: 60W/AC220V × 4, indicator tower light, buzzer, Pressure balance device
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Door
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Dual hinged double-leaf door
Single-leaf: H2000 mm × W1200 mm
Safety lock (openable from inside)
Heated anti-condensation double-glazed viewing windows (W400 × H600 mm ×2)
Heated door frame
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Control Panel
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Temperature & humidity display controller, over-temperature protector, emergency stop, run indicator, fault indicator, buzzer
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Mechanical Compartment
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Refrigeration system, drain/water system, fans, electrical control cabinet, humidification & water control system
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Electrical Control Cabinet
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Cooling fans, distribution board, sample power terminals, RS-485 interface, main power breaker
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Heater
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316 stainless steel armored heater
Control method: SSR (solid-state relay) zero-crossing PWM
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Humidification (Humidity Type Only)
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Boiler-type steam humidification, 316 stainless steel heater
SSR PWM control
Water level control and dry-burn protection
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Refrigeration System
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Working Method
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Compressor refrigeration system
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Evaporator
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Finned heat exchanger (also for dehumidification)
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Condenser
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Shell-and-tube or brazed plate heat exchanger
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Expansion Device
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Thermal expansion valve, capillary tube
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Refrigeration Control
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PLC automatically adjusts refrigeration conditions
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Refrigerants
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R404A, R23 (both with zero ozone depletion index)
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Main Component Brands
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Compressor
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Bitzer (Germany, dual compressors)
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Refrigerant
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DuPont/Honeywell (USA)
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Refrigeration Oil
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American Arctic Bear/Honeywell
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Pressure Switch
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Danfoss (Denmark) / SAGInoMIYA (Japan)
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Evaporator Pressure Regulato
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Danfoss
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Dryer Filter
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Danfoss / Emerson (USA)
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Expansion Valve
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Danfoss / SPORLAN (USA)
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Solenoid Valve
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SAGInoMIYA (Japan) / ODE (Germany)
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Oil Separator
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Emerson
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Electrical Control System
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Display
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7-inch TFT true-color LCD, 800×480 resolution
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Operation Modes
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Program and constant value
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Setting Method
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Touch panel, Chinese/English menu
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Program Capacity
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100 programs, each up to 10,000 steps, 9999 loops
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Setting Range
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Temperature: device range +5°C / –5°C extension
Humidity: 0–100%RH (humidity chamber)
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Display Resolution
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Temperature: 0.01°C
Time: 0.01 min
Humidity: 0.1%RH
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Inputs
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PT100 RTD, voltage, current (depending on configuration)
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Communication
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PC connection for curve display & data logging
Remote monitoring and control
Multi-chamber synchronization
RS-485, RS-232, Ethernet (choose one), USB 2.0
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Control Method
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Temperature: anti-integral-saturation PID + auto-tuning
Humidity: anti-integral-saturation PID + auto-tuning
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Curve Recording
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Battery-backed RAM
Recording interval: 1 s –120 s
Maximum history: 720 days (at 2 min interval)
Data retention ≥10 years (without power)
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Additional Functions
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Fault alarm with cause & troubleshooting guide
Power failure recovery
Upper/Lower temp limit protection
Timer (auto start/stop)
Self-diagnosis
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Temperature & Humidity Sensors
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Temperature: PT100 RTD
Humidity: Electronic humidity sensor
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Electrical Component Brands
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Power Switch
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CHNT
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AC Contactor
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Schneider (France)
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Thermal Relay
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Schneider
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Phase Sequence Relay
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Schneider
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High/Low Temp Protector
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Yatai
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AC Relay
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Schneider / Fuji (Japan)
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SSR
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Yangming
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Water Supply System (Humidity Type Only)
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Water Supply Method
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Pump lifting
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Water Tank
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Hidden type
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Safety Protection Devices
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Refrigeration System
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Compressor overpressure
Compressor motor overheating
Compressor motor overcurrent
Cooling water low pressure
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Humidification System (Humidity Type Only)
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Low water level warning
Anti-dry-burn protection
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Test Chamber
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Adjustable high/low temperature limiter
Thermal fuse in test space
Air channel over-temperature protection
Fan motor overcurrent
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Other
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Phase sequence & phase loss protection
Leakage protection
Load short-circuit protection
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Other Configurations
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Sample Power Terminals
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Relay-controlled, AC220V, within 2A
Closed during operation; open during stop or fault
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Additional Items
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Two internal sockets (10A), resistant to -30°C without cracking
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Cooling Method
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Water-cooled system (manufacturer provides cooling tower, water pump, and installation)
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