| 1.Product name | Walk-in Constant Temperature and Humidity Test Chamber |
| Mode | SN886-27m3 |
| 2.Applicable instructions |
| 2.1. Applicable range | This equipment is suitable for environmental simulation reliability
tests of various electrical and electronic products and other
products, parts and materials, such as constant high and low
temperature, gradual change, and cycle tests. |
| 2.2. Safety test restrictions | A) Test and storage of samples of flammable, explosive and volatile
substances B) Test of corrosive substance samples,test and storage of
biological samples C) Test and storage of strong electromagnetic emission source
samples |
| 3.Volume and size |
| 3.1. Effective volume | 27m³ |
| 3.2. Inner chamber size | W3000 mm *D3000mm*H3000 mm |
| 3.3. Outer chamber size | About W5700 mm*D5000 mm*H3200 mm(Excluding unit size) Reminder: Please refer to the final design and confirm the three
views for the external dimensions |
| 4.Performance |
| 4.1. Cooling method | Water cooling |
| 4.2. Temperature range | -40°～ 120℃ |
| 4.3. Humidity range | 30%-98%RH |
| 4.4. Temperature /humidity fluctuation | ±2℃ / ±2.0%RH |
| 4.5. Temperature resolution accuracy | 0.01℃ |
| 4.6. Humidity resolution accuracy | 0.01RH |
| 4.7. Temperature uniformity | ≤2℃ |
| 4.8. Humidity uniformity | < 75%RH:±3%RH; >75%RH±5%RH |
| 4.9. Heating time | RT～80℃≤90min |
| 4.10. Cooling time | RT～-50℃≤130min |
| 4.11. Temperature rise and fall overshoot | ≤±1℃ |
| 4.12. Load situation | 4KW(Generating capacity of heat of sample) |
| 4.14. Test standards | IEC60068-2-1:2007 “Environmental Testing-Part 2-1: Tests-Test A:
Cold, IDT” IEC60068-2-2:2007 “Environmental Testing-Part 2-1: Tests- Test
B-Dry heat, IDT” IEC60068-2-78:2012 “Environmental Testing-Part 2-78: Tests-Test
Cab: Damp heat, steady state, IDT” IEC60068-2-30:2005 “Environmental Testing-Part 2-30: Tests-Test Db:
Damp heat, cyclic (12h+12h cycle), IDT” |
| 4.15. Schematic diagram of temperature and humidity |
PS: Standard humidity 20%~95%HR |
| 5.Structure and material |
| 5.1 Outer chamber material | Adopt advanced cold and hot steel plate non-static nano-baking
paint |
| 5.2. Inner chamber material | SUS304 stainless steel plate |
| 5.3. Thermal insulation materials | High temperature and fire-resistant rigid polyurethane foam |
| 5.4. Door frame sealing strip | Silicone rubber sealing strip |
| 5.5. Chamber door | Double-leaf doors open outside, the door frame and the edge of the
door panel are equipped with electric heating devices and overflow
ditch |
| 5.6. Electric heating glass observation window | Quantity: 2 Location: On the door of the test room (or the place designated by
the customer) Form: 3-layer vacuum strengthened glass with built-in anti-fogging
heating element |
| 5.7. Lighting | High and low temperature resistant explosion-proof energy-saving
lamp |
| 5.8. Pressure balance port | All aluminum alloy with anti-sweat line 4 sets of self-resetting
pressure windows |
| 5.9. Weight bearing | Laboratory load: 1000KG |
| 5.10. Sample hole | A hole with a diameter of φ100mm on the left side chamber wall and
equipped with a rubber isolation plug and a rubber cover at the
same time.
|
| 5.11. Non-slip floor | The floor adopts a 4.0mm stainless steel non-slip design to prevent
personnel from being injured during internal operations.
|
| 5.12 Drainage | The floor is designed with a drainage tank, and the test chamber has no water inside after the end of high
temperature and humidity test
|
| 5.13 Foot cup | The foot cup of the electric box adopts silica gel pad to absorb
shock and protect the compressor and copper pipe welding
|
| 5.15. Noise of the whole machine | ≦80dB |
| 6.Air conditioning system |
| 6.1. Constant temperature method | Adopt cold balance method |
| 6.2. Working principle of energy saving | Conventional constant humidity method: When the actual temperature reaches the set temperature, the
compressor's cooling capacity remains unchanged, and the heating
method is used to offset the compressor's cooling capacity to
achieve temperature balance in the box. Cold balance method: When the actual temperature reaches the set value, the cold
solenoid valve output is controlled by the controller PID, and the
temperature in the box is balanced through the controlled cooling
output. Compared with the conventional constant humidity method,
the heating output is reduced to make the whole unit Compared with
the conventional method, the equipment can achieve 40% energy
saving |
| 6.3. Air cooling method | Cascade compressor refrigeration |
| 6.4. Circulating motor | Taiwan Tatung Low Voltage Induction Motor |
| 6.5. Sensor | With temperature and umidity measurement sensor and controller PT100 platinum resistance sensor |
| 6.6. Wind wheel | Multi-wing centrifugal circulating fan, high and low temperature
resistant aluminum alloy blade |
| 7.Refrigerating system |
| 7.1. Cooling method | Original imported cascade silent type, high efficiency and energy
saving compressor |
| 7.2. Compressor | Original imported German Bitzer semi-hermetic compressor. 2 sets of 6HP compressors
|
| 7.3. Refrigerant | Non-fluorine environmental protection HFC404A (Honeywell) and
DuPont R23 refrigerant
|
| 7.4. Condenser | High-efficiency shell and tube type (water cooling) Equipped with cooling water tower (well-known brand) and pipeline |
| 7.5. Evaporator | High-efficiency multi-section fin evaporator with hydrophilic
membrane (thickened fin)
|
| 7.6. Oil separator | Emerson AW
|
| 7.7. Expansion valve | Danfoss Thermal Expansion Valve
|
| 7.8. Solenoid valve | Japan Saginomiya and Danfoss
|
| 7.9. Other accessories | All high-quality products of the first international brand
(pictured on the right: drying filter)
|
| 7.10. Dehumidification | Freezing and dehumidifying by the refrigeration system (the air in
the box passes through the evaporator below the dew point
temperature, and water is precipitated).
*Choose evaporator fins with hydrophilic membrane treatment, better
dehumidification performance, because the water tension of the
hydrophilic membrane aluminum fins is small, the water droplets
from air condensation are easy to slip off, and it is not easy to
produce obstructive water bridges in the fin gap. Thereby greatly
improving the dehumidification efficiency! |
| 8. Heating and humidification system |
| 8.1. Heating method | Electric heating |
| 8.2. Steam supply method | Open direct injection, the inside of the generator is directly
connected to the test chamber, keeping the internal pressure close
to zero |
| 8.3. Heating tube | Stainless steel finned nickel-chromium alloy electric heating tube,
heating tube anti-MC adhesion design, heater connection,
heat-resistant wire is used, the heater is placed in the
circulating air duct on the top of the box, and fire-resistant and
heat-insulating materials are added around it
|
| 8.4. Humidification tube | A) The humidification cylinder (boiler method) is used for
humidification, which is faster than the traditional surface
humidification (water pan type) and has higher control accuracy. In the box It will not produce impurity pollution such as scale, has good
low-humidity performance, and is easy to clean. B) The humidification tube adopts all stainless-steel seamless
casing, the insulation resistance is greater than 50MΩ, and has a
dry-burn prevention controller C) The humidification cylinder is made of stainless steel and has a
water level observation window. D) Low temperature with dry air
|
| 8.5. Control method | Non-contact control the output signal of the controller achieves
high precision through SSR solid state relay Non-contact switch control |
| 8.6. Humidification boiler | Installed inside the machine room |
| 8.7. Humidification water treatment | Equipped with a dedicated water softening device, which can
effectively remove impurities in the water (1 set of pure water
recovery system device, with activated carbon filter to filter
water impurities). |
| 9.Control system |
| 9.1. Controller | The controller has English display, self-diagnosis function,
prompts the cause of failure and treatment method, and records test
data and process |
| 9.2. Dialogue interface | Industrial control architecture touch screen LCD color display,
English menu dialogue mode |
| 9.3. Setting accuracy | Temperature 0.1℃, time 0.1 minutes, humidity 1%RH |
| 9.4. Temperature input | High-precision sensor |
| 9.5. Humidity input | High-precision electrostatic capacitance humidity sensor |
| 9.6. Control method | PID control |
| 9.7. Operation mode | Program operation mode, fixed value operation mode, timing start-up
operation mode |
| 9.8. System capacity | 1000 groups of programs*100 segments per group (1000 times can be
cycled separately), the number of segments required by each group
of programs can be divided arbitrarily, and each group of programs
can be freely linked to each other |
| 9.9. Test data display | Set temperature, measured temperature, total operating time,
segment operating time, segment remaining time, heating status,
calendar time, etc. |
| 9.10. Built-in PLC function | It can directly drive each execution part, and the logic operation
is completed by PLC software |
| 9.11. Automatic selection of refrigerator working conditions | According to different test conditions, automatically select the
working state of the refrigerator |
| 9.12. Communication interface | Equipped with RS485 interface, it can be connected to an external
computer for remote temperature control, and it has a computer
remote diagnosis function. It can adjust and monitor the operation
of the equipment, programs, instructions, and software through the
Inter network. |
| 10. The main components of the control circuit | The main components of the control circuit are all high-quality
brands
|
| 11. Safety protection function | 1. Test product over-temperature protection (independent) 2. With no fuse protection switch 3. Heater over-temperature protection switch 4. The compressor is overloaded and overheated 5. Compressor high- and low- pressure protection 6. System over-current protection device 7. The controller self-diagnoses the fault and displays it 8. Cooling water pressure is too low protection 9. Leakage protection, short circuit protection, wrong phase /
phase loss protection, fan overload protection, independent over
temperature protection, water shortage protection, water cut
protection, operation indication, sound and light alarm, automatic
power off after alarm, etc. |
| 12. Conditions of use | 1. Ambient temperature: -5℃~+28℃; 2. Relative humidity: ≤85%RH; 3. Atmospheric pressure: 80kPa~106kPa 4. No strong vibration around 5. Equipment power supply: (note that the test power supply is not
included) 5.1 Connect to power supply 380V AC (±10%), three-phase wire +
protective ground wire, grounding resistance ≤ 4Ω; 5.2 Total power: about 30KW 5.3 Maximum working current: about 70A |
