Thermal Shock Chamber be used for testing most commercial products to see how they withstand drastic temperature changes. Simply to say, A thermal shock chamber will subject a product to the most extreme temperature conditions, instantly.
The purpose of testing a product under these circumstances by the thermal shock chamber is to observe changes in the products characteristics and check for failure occurrence of different materials and thermal expansion coefficients. These thermal shock chambers are prohibited to flammable explosive easily to volatile substances sample test or storage, corrosive substance sample testing or storage, biological sample test or storage, strong electromagnetic emission source sample test.
Quality inspection for all types of electronic products, electric appliance, and products from communication, instrument, automobile, plastic, metal, food, chemical, building materials, medical and aerospace industries.
The Three-Box Type Thermal Shock Chamber (WE-TST-080-B) Related Features:
● Thermal shock chamber divided into three zones: High temperature zone, low temperature zone, and testing zone. The test sample is in static mode. ● Using touch-control graph control as operation interface, easy to operate. ● Use wind route conversation to shock way to distribute temperature to test zone for cold shock measurement.
● For high or low temperature shock, max. Time is up to 999H, and max. Circulation cycles are 9999 times. ● The system can be used for automatic Circulation Shock or manual selective shock. ● Can entering normal temperature. RS-232 and RS-485 communication. ● The thermal shock chamber adopt binary cooling system, with quick cooling effect. Cooling method is water cooling.
Model Desc
WE-TST-027-B
WE-TST-050-B
WE-TST-080-B
WE-TST-150-B
Voluem Size
27L
50L
80L
150L
Interior Dimension (W×H×D)
300*300*300mm
350*400*350mm
400*500*400mm
500*600*500
Exterior Dimension (W×H×D)
900*1260*1670mm
900*1260*1670mm
1600*2300*2100mm
1700*2400*2200mm
Structure
Two/Three Zones
Two/Three Zones
Two/Three Zones
Two/Three Zones
Maximum Sound Level
55 dBA
60 dBA
65 dBA
65 dBA
Electric Current
35A max
55A max
78A max
120A max
Cooling System
Air Cooling
Water Cooling
Air Cooling
Water Cooling
Temperature Range
-70°~200°C
-70°~200°C
-70°~200°C
-70°~200°C
Temperature Fluctuation
±0.5°C
±1.0°C
±1.0°C
±2.0°C
Humidity Range
40～95%RH
40～95%RH
40～95%RH
40～95%RH
Preheating Temperature Limit
200°C
200°C
200°C
200°C
Heating Rate
0°C~200°C/30 min
0°C~200°C/30 min
0°C~200°C/30 min
0°C~200°C/30 min
Precooling Temperature Limit
-70°C
-70°C
-70°C
-70°C
Cooling Rate
0°C~ -70°C/90 min
0°C~ -70°C/90 min
0°C~ -70°C/90 min
0°C~ -70°C/90 min
Temperature Recovery Time
In 10 min
In 10 min
In 10 min
In 10 min
Test Area Bearing
50 Kgs
50 Kgs
50 Kgs
80 Kgs
Shelf Bearing
20 Kgs
20 Kgs
30 Kgs
30 Kgs
Setting Range
Temperature:
-100°C~200°C
TIME:OHIM~999h
CYCLE:0 ~9999
Output Mode
PID+SSR
(control method)
PID+SSR
(control method)
Power supply
AC 220V, 230V
50/ 60 Hz
AC 380V ±10％,
50/ 60 Hz
Gross Weight
350 Kgs
475 Kgs
650 Kgs
950 Kgs
WEWON THERMAL SHOCK CHAMBER 01
Thermal Shock Test Chambers, Looking for Partner
WEWON THERMAL SHOCK CHAMBER 02
Thermal Shock Test Chamber, Looking for Partner
WEWON THERMAL SHOCK CHAMBER 03
Thermal Shock Test Chambers, Looking for Partner
WEWON THERMAL SHOCK CHAMBER 04
Thermal Shock Test Chamber, Looking for Partner
In fact, We have a customer request a more strictly liquid nitrogen cooling system design. This kind of thermal shock chamber with a highly technology inside of the chamber. There seldom Chinese environmental test chamber manufactures can produce it. But We get this customer order at last. The technical parameters for this Liquid Nitrogen with France Tecumseh Cooling Thermal Shock Chamber as below mentioned :
Overall Feature of the Thermal Shock Chamber:
Thermal Shock Chamber’s Type:
Three cabinet version, Air to air vertical type thermal shock chamber.
Testing Type of thermal shock chamber:
Time based thermal shock (Test specimen dwells at each test area for a definite period of time defined by the respective dwell timer)
Cooling Method:
Cooling by Refrigeration, and Cooling by Liquid Nitrogen (LN2) circulation/ injection.
Heating Method:
Electrical Resistance Heaters.
Nominal Operating Temperature Range:
Hot Cabinet : ≤ +40º C to ≥ +250º C
Ambient cabinet : ≤ +10º C to ≥ +80º C
Cold cabinet : ≤ -65º C to ≥ +60º C (Cooling by refrigeration)
Cold testing cabinets : ≤ -180º C to ≥ +60º C (Cooling by liquid nitrogen).
≤ 5.1 minutes to cool from+150º C to -65º C (by refrigeration cooling in cold test cabinet)
≤ 5.1 minute to cool from+250º C to -180º C (by LN2 cooling in cold cabinet)
≤ 5.3 minutes to heat from -65º C to +150º C. (Heating in hot cabinet)
≤ 5.2 minutes to cool from +150º C to +25º C. (Cooling in ambient cabinet)
≤ 5.3 minutes to heat from -65º C to +25º C. (Heating in ambient cabinet)
Basket Transfer Type:
Electro mechanical elevator/ pneumatic piston.
Basket Displacement Speed:
≤ 10 seconds (without jerks & mechanical shock
Basket Load Carrying Capacity:
≥25kg.
Number of Settable Test Cycles:
0 to 9999 cycles (operator re-settable).
Dwell Timers Set Range:
0 to 99 minutes with least count of seconds.
Cold Cabinet Gasket Heating:
By diathermic oil circulation.
Electrical Features:
Wiring Comment:
All the wires shall be suitably numbered or labeled for easy identifications and documentation. The wires shall be strapped / bundled and routed through the ducts.
All electrical circuits shall have reliable safety devices like fuse or circuit breaker.
Power connection terminal block and ground lugs shall be provided for easy utility connections.
Complete wiring shall meet International Standard Code.
The electrical control system shall conform to industry standard and must facilitate the following:
Electric connections according to IEC specification
Smooth starting of electrical systems.
Electrical protection against load faults such as short circuit, overload etc.,
Electrical protection against supply faults such as single phasing, low voltage
Noise level of the chamber shall be less than 75 dB (A). (typically at 1 m distance from chamber).
Thermal Shock Chamber’s Construction:
Description:
The chamber shall be of mono block structure construction, comprising three cabinets placed one above the other (Hot cabinet at top, ambient cabinet at middle and cold cabinets at bottom).
Exterior:
The exterior housing must be made from lightweight, self-supporting, corrosion resistant, galvanized steel-sheet of suitable thickness. The outside surface of the exterior wall shall be primed and painted to a standard finish with high quality materials.
Interior:
Complete construction of the inner testing spaces shall be made of Stainless steel
All the joints shall be continuous seam welded to form a hermetically sealed unit in order to prevent external moisture migration.
The inner shell shall have good suitable thickness and structural rigidity to withstand thermal induced thermal stress.
Inner wall shall be connected to external wall suitably.
Test Space:
Upper test cabinet shall be hot cabinet and equipped with fan, heaters, temperature sensor, thermostat etc.,
Middle test cabinet shall be ambient cabinet and equipped with fan, heaters, evaporator, temperature sensor, thermostat etc.,
The lower test cabinet shall be cold cabinet and shall equipped with fan, heaters, evaporator, temperature sensor, thermostat etc.,
All the fan motors shall be placed outside the test space with suitable protection.
If cooling by LN2 injection method an appropriately sized port shall be provided at the centre of the cold test room wall to vent the vaporized LN2 so as to avoid over pressurization in the test space.
Materials used in testing room size conditioning shall not generate any corrosive elements like sulphur, chlorine etc.,
Temperature sensor or any other items in the test cabinet shall not protrude into the usable testing volume of specimen carriage basket.
Insulation Description:
Suitable environmental friendly, low thermal conductivity, high density and non hygroscopic insulation material shall be provided between interior and exterior of the chamber and also between the test cabinets. Asbestos insulation or hazardous substance shall not be used. The thickness of the insulation shall be such that to ensure the following conditions:
The outer wall surface temperature of the cold cabinet shall be ≥ 20oC, when cold testing room is maintained at -180o C in continuous operation.
The outer wall surface temperature of the hot cabinet shall be ≤ 35o C, when hot cabinet is maintained at +250oC in continues operation.
Test Specimen Carriage Basket:
The chamber shall be provided with electrical driven actuator / pneumatic piston actuator to transfer specimen holding carriage (Basket) between the test cabinets. Clear basket dimension shall be ≥ 500mm (D) x ≥500mm (W) x ≥500mm (H). The basket shall be transferred vertically between the test cabinets in short duration (≤ 10 seconds) without jerk & mechanical shock after the lapse of the set time in each cabinet. The basket shall be made of stainless steel mesh to facilitate good air circulation.
Travelling Cable Port:
The chamber shall be provided with travelling cable port at test specimen carriage basket for the usage of temperature sensors and signal wires external from the test package. Any part of the travelling cable port shall not protrude into the usable test room’s volume of the basket. Travelling port inside shall be Teflon sleeved and clear inside dia shall be ≥50mm.
Door Description:
The chamber shall have door at front side. The door shall be fully open able (180C or more) to facilitate test article loading and unloading
Heaters shall be provided at the door at appropriate place to avoid moisture condensation on the outside surface.
Suitable numbers of locks / clamps shall be provided to ensure uniform pressure and air tightness of the thermal shock chamber testing room.
Window and Interior Lights:
The chamber door shall have multi-pane observation window of size ≥ 0.3m x 0.3m to view/inspect the test sample/ specimen in the ambient cabinet. The test room shall have proper lighting for functional inspection.
Condensation Water Drain:
A backpressure free automatic drain shall be provided at cold room and ambient room to remove humidity/condensation water.
Testing Standards:
The chamber shall be designed to conduct thermal shock tests as per the international standards (MIL-STD, IEC, DIN, etc.) as applicable.
Run Time Meter:
Run time counter shall be provided for recording the total running time in hours of the chamber
Thermal Shock Chamber’s Safety
Audio / Visual Alarm system on machine & computer for fault reporting.
Chamber protection during power failure, power surge, low power, fluctuating power or power reversal.
Prevention of condensation on test samples.
Fuse protection for mains and individual circuits.
Over temperature safety cut off thermostat with audio alarm.
Integral Fault Diagnostic system/Auto diagnosis program for safety with troubleshooting for equipment.
Auto/self adapting power control of cooling system.
High and low temperature protection for testing samples.
Door opening electrical switch control with chamber conditioning fan.
Test cabinet fan interlock for Heaters and Refrigeration.
Factory set high heat limit.
All electrical & electronics components should be CE marked components.
Safety interlocks to prevent basket transfer when chamber door is open.
Thermal Shock Chamber Conditioning System:
Heating System:
Heating shall be achieved by non-corrosive and long life electrical heaters.
Heaters shall be baffled from testing space to prevent direct heat radiation on test samples.
Heaters shall be of easily removable type for maintenance / replacement activity.
Heating system shall have over temperature protection for test space by power isolation.
Cooling system: Cooling shall be achieved by following two methods:
Cooling by Refrigeration system (To cool down -65º C).
Cooling by LN2 circulation/injection system (To cool down to -180ºC)
Refrigeration system shall include the followings:
Refrigeration system shall be two stage (High stage & Low stage) cascade type
High stage refrigeration system shall be charged with R404A refrigerant and low stage refrigeration system with R23 Refrigerant.
Compressors shall be of Scroll / Hermetic / Semi-hermetic type.
Condenser shall be of air cooled/water cooled.
Evaporator shall preferably have copper tubes and copper fins.
Refrigeration system shall be fitted with electrical & temperature protection, safety pressure switches etc.,
Compressor shall be placed on anti-vibration mounts (acoustic isolation).
Circulation/Injection system shall include the followings:
LN2 circulation/injection system shall have long stem solenoid valve, flow meter, pressure gauge, safety relief valve, etc., in the thermal circuit.
If cooling is by LN2 circulation method, the heat exchanger shall preferably have copper tubes and copper fins.
If cooling is by LN2 injection method, the LN2 should be atomized thoroughly and only cold GN2 shall have contact with test sample.
GN2 Purging System:
All the three test cabinets shall be provided with GN2 purging provision. Each testing space shall be provided with one ½ inch NPT pipe connection (preferably) for GN2 purging.
Wewon Environmental Chambers Co., Ltd. as a manufacturer and supply thermal shock chamber for abroad partners many years ! The mainly product from Wewon Environmental Chambers Co., Ltd. are : thermal shock chamber, walk-in chambers, thermal shock chambers, xenon test chambers, ozone test chambers and thermal shock test chambers.
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