• IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L
  • IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L
  • IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L
  • IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L
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IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L

Product Details:

Place of Origin: China
Brand Name: Sinuo
Certification: Calibration Certificate (Cost Additional)
Model Number: SN881-252L

Payment & Shipping Terms:

Minimum Order Quantity: 1
Price: Customized
Packaging Details: Plywood Case
Delivery Time: 30 days
Payment Terms: T/T
Supply Ability: 30 sets/month
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Detail Information

Applied Standard: IEC60068-2-1, And Etc. Inner Size: 600×600×700mm
Working Volum: 252L Temperature Range: -70 ℃~+120℃
Humidity Range: 20%RH~98% RH Heating Rate: ≥3℃/ Min
Cooling Rate: ≥1℃-1.2℃ /min Temperature Error: ±2.0℃
High Light:

Programmable constant temperature humidity chamber


250L constant temperature humidity chamber


IEC60068-2 environmental chamber temperature humidity control

Product Description



-70℃ Programmable High and Low Alternative Temperature and Humidity Test Chamber


Complied Standards & Clauses

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 ”


Technical Parameters

1. Sample limitation This test chamber prohibits:
Testing or storage of flammable, explosive, and volatile substance samples
Testing or storage of samples of corrosive substances
Testing or storage of biological samples
Testing or storage of strong electromagnetic emission source samples
Testing or storage of radioactive material samples
Test or storage of highly toxic substance samples
Testing or storage of samples that may produce flammable, explosive, volatile, highly toxic, corrosive and radioactive materials during testing or storage
2. Volume, size and weight
2.1 Nominal content volume


Other working volume can be customized

2.2 Inner chamber size

D(600)mm ×W(600)mm× H(700)mm

Other size can be customized

2.3 External dimensions

Approx. D(1150)mm ×W(1100)mm× H(1720)mm

Or subjected to actual design

2.4 Weight Approx. 350KG
3. Performance
3.1 Temperature range Temperature range:-70 ℃~+120℃
3.2 Humidity range

(20 ~ 98)% RH (refer to temperature and humidity controllable range chart, no active wet and heat load)

IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L 0

Temperature and humidity controllable range chart

3.3 Temperature fluctuation ≤±0.5℃ (The temperature fluctuation is half of the difference between the measured maximum temperature and the minimum temperature at the center point)
3.4 Temperature uniformity ±2.0℃ (Temperature uniformity is the arithmetic mean of the difference between the highest and lowest temperature measured in each test)
3.5 Temperature error ±2.0℃
3.6 Heating rate ≥3℃/ min (non-linear under no load)
3.7 Cooling rate ≥1℃-1.2℃ /min (non-linear under no load)
3.8 Relative humidity error
(Damp heat only)

3.9 Working noise


Sound level≤85dB

(Measured in a soundproof room with an ambient temperature of 25 ° C and low echo; using A weighting, the average value of 8 points is tested; each test point is 1 meter away from the noise source and 1 meter away from the ground)

4. Structural characteristics

4.1 Material



1. Outer wall material: Cold rolled steel plate, pickling and phosphating advanced powder baking paint
2.Inner wall material: SUS304# stainless steel plate
3. Chamber insulation material: rigid polyurethane foam + glass fiber
4.2 Air duct parts Centrifugal fan; the air outlet can adjust the air volume, height and return air volume
4.3 Door Double open hinged door, adopts reaction-free grip handle, equipped with observation window, lighting lamp, window/door frame anti-condensation electric heating device, door opening size: (approximately) 0.6*0.7M
4.4 Observation window There is one conductive film explosion-proof tempered glass observation window on the door (with anti-condensation function) 300W×290H (mm)
4.5 Fan Long axis centrifugal fan
4.6 Sample rack Two built-in stainless steel adjustable movable tray racks


4.7 Impeller


Use stainless steel impeller imported from Taiwan
4.8 Heater Nickel-chromium alloy electric heater


4.9 Refrigeration Compressor



French Tecumseh compressor


​4.10 Evaporator



Fin type evaporator


4.11 Refrigerating method



Mechanical compressor cascade


4.12 Cooling method





4.13Temperature control instrument



7-inch smart LCD touch programmable controller

4.14 Lead hole Φ50mm, 1pc, equipped with a special foam rubber plug (located on the left side of the chamber)


5. Heating, humidification and refrigeration systems and their working principles


5.1 Heating system Stainless steel sleeve type anti-dry heating tube built-in nickel-chromium alloy heating wire
U-shaped fin type stainless steel high-speed heating electric heater is used for heating
Completely independent system, does not affect the control circuit
5.2 Humidification system

Boiler heating and humidification method

Stainless steel armored heater: Provides the heat required for water vaporization.

Heater control mode: non-contact isocycle pulse width modulation, SSR (Solid State Relay)

Equipped with water level control device and heater anti-drying device
5.3 Refrigeration system Cooling method: air-cooling
Refrigeration compressor: Germany Bitzer compressor with environmentally friendly refrigerant
Refrigerant copper tube: inner spiral K-TYPE refrigerant copper tube
Condenser: wave-shaped fin type air-cooled condenser
Evaporator: Slope type FIN—TUBE evaporator
Freezing element: Original imported solenoid valve, drying filter, etc.
5.4 Features The pipelines of the whole system are subjected to a 22kg leak detection test
The heating and cooling system is completely independent
The system can prevent high temperature and high pressure air flow back
All refrigeration system action programs are completely controlled by the microcomputer controller




6. Regulation system


6.1 Regulation method

Forced circulation ventilation, balance temperature regulation method. The control system controls the output of the heater through the PID automatic calculation output according to the temperature point set by the system, and finally reaches a dynamic balance.

IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L 1

6.2 Circulation device The built-in air-conditioning room, circulating air duct and long axial flow fan can improve the air flow and heating capacity by improving the air flow, and greatly improve the temperature uniformity of the test chamber.


7. Program control system



7.1 Controller


7 inch PLC LCD touch programmable controller


7.2 Display accuracy


0.01℃/ 0.1%RH


7.3 Touch-type high-resolution screen


Arbitrary setting of fixed conditions, program conditions, and setting of curing test name, serial number, etc.


7.4 Time range can be set


7.5 Programmable mode At the same time, 120 groups of programs with different conditions can be set. In any group of programs, it can be divided into 1200 sections, and part of the number of sections can be intercepted arbitrarily to execute the cycle, or to perform cycle work of any section or group.
7.6 Safety It has a power-off memory device, which can continue to execute the remaining programs when the power is restored, and can be used as a machine appointment to execute the startup and machine running time.
7.7 Control The temperature rise and fall can be used for slope control, curve control, and have the function of self-correcting temperature and humidity reference points. It has the function of PID automatic calculation, which can reduce the convenience caused by manual setting.
7.8 Communication function U disk interface, RS-232 interface, misoperation hardware lock ( LOCK), computer communication software is provided


7.9 Setting


Settings and all conditions are automatically locked by microcomputer


7.10 Alarm


If an error occurs during setting or operation, a warning signal will be provided
7.11 Output The controller has a recording signal port output, which can be connected to a temperature and humidity recorder and can output recording curves


7.12 Interface


Equipped with standard RS-232 communication interface, long transmission distance, can be connected to PC for control and recording.


8. Safety protection device


8.1 Refrigeration system 1. Compressor overheating protection
2. Compressor overcurrent protection
3. Compressor high and low pressure protection
4. Compressor oil pressure protection (optional for large semi-hermetic compressors)
5. Over-temperature protection for liquid supply temperature
6. Ultra-high pressure relief protection
7. Air-cooled: condensing fan overheated protection
8.2 Test chamber

1. Adjustable over temperature protection
2. Limit over-temperature protection of air conditioning channels
3. Fan motor overheat protection


8.3 Other protection 1. Total power phase sequence and phase loss protection (for three-phase power supply)
2. Overload and short circuit protection
3. The refrigeration system failure alarm protection caused by multiple openings of the cabinet


9. Conditions of use



The following conditions are guaranteed by the user

9.1 The installation site

1. The ground is level and well ventilated
2.No strong vibration around the equipment
3.No strong electromagnetic field around the equipment
4.No flammable, explosive, corrosive substances and dust around the equipment
5. Appropriate use and maintenance space is left around the equipment, as shown below:

IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L 2

A:≥40cm B:≥150cm C:≥100cm D: ≥60cm E:≥40com
9.2 Environmental conditions 1. Temperature: 5 ℃ ~ 35 ℃
2. Relative humidity: ≤85%
3. Air pressure: 86kPa ~ 106kPa
9.3 Power supply conditions Power requirements:
1. One five-core (three-phase four-wire + protective ground wire) cable (about 4 meters long)
2. Voltage range: AC 380 V
3. Allowable frequency fluctuation range: (50 ± 0.5) Hz
4. The protective earth ground resistance is less than 4Ω
5. The user is required to configure the equipment with an air or power switch of the corresponding capacity at the installation site, and this switch must be independently used by the device


9.4 Maximum current
Maximum power consumption




9.5 Others Opening the door of the test chamber during the test will cause temperature and humidity fluctuations in the chamber; if the door is opened multiple times or is left open for a long time or the test sample emits moisture during the test, the refrigeration system heat exchanger may freeze and does not work.


Equipment Overview

This test chamber simulates the temperature and humidity changeable environment for the products or materials. It is widely used in the adaptability test of electrical, electronics, instrument and meter and other product parts under high and low temperature and humid environment during storage, transportation and usage, to determine the temperature adaptability of the above products or materials to high and low temperature and humid environment, especially for product electrification changes in performance and mechanical properties.



1. The test system has advanced and reasonable structural design, standardized manufacturing process, beautiful appearance and generous appearance.

2. The main functional components of the test chamber are world famous branded ones. The test chamber has best control of noise and energy saving.

3. The matching of components and assembly is good. The main functional components are imported from the internationally branded companies, which improves the safety and reliability of the test chamber, and can ensure the long-term, high-frequency usage purposes.

4. The equipment has good operability, maintainability, good temperature stability and durability, good safety performance. It does not pollute the environment and endanger human health.


Electrical control system

IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L 3


Components Brand

IEC 60068-2-1 High Low Temperature Humidity Test Chamber -70℃ 252L 4

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