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Home >> Products >> Impact Testing Machine >> Auxiliary Device >> Low Temperature Chamber For Impact Test

Nitrogen cooling chamber for ultra-low temperature

Low Temperature Chamber For Impact Test

Model: DWC-40, DWC-60

DWC low temperature chamber is a supplemental equipment for impact test under low temperature. Use imported high quality compressor to refrigerate, single-chip micro processor control, auto control temperature, timing, alarm etc.; Refrigeration fast, big volume; Digital display temperature value, safe and reliable, easy to operate.

Impact test cryogenic chamber is a special temperature control equipment for metal Charpy pendulum impact test, which is used to cool the impact specimen to a set temperature of -196°C~ room temperature (some models can reach -196°C) and keep warm, meeting the requirements of GB/T 229, ISO 148, ASTM E23 and other standards for low-temperature impact testing, and is the core auxiliary equipment to ensure the accuracy of low-temperature impact data.

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General introduction

Key Features

Key Features
Core principle
Core Function
Standard
Operation Process
Selection Recommendations

** double stirring motor: to make the cold liquid movement, uniform cooling.

** working bench is stainless steel plate.

** specimen rack is net type stainless steel.

Principle: Mechanical compression refrigeration (overlapping refrigeration technology) or liquid nitrogen-assisted refrigeration is used to quickly and uniformly cool down through thermal conductive media (ethanol, methanol, liquid nitrogen, etc.), precise temperature control and stable heat preservation.

Structure: insulation box (stainless steel liner, polyurethane insulation), refrigeration system (compressor, condenser, evaporator), temperature control system (high-precision temperature controller, sensor), mixing system (motor + stirring paddle), medium circulation system, safety protection device (over-temperature alarm, low level alarm, overload protection).

Precise temperature control: Automatically cools down after setting the temperature, with a temperature control accuracy of ±0.5°C, meeting the strict requirements of the standard for test temperature.

Fast cooling: The overlapping refrigeration technology can quickly reduce the low temperature (such as -80°C for about 30~60 minutes), and the liquid nitrogen-assisted cooling is faster (-196°C can be achieved quickly).

Uniform heat preservation: The stirring system makes the temperature of the medium uniform, and the temperature of all parts of the sample is the same, so as to avoid local temperature differences affecting the test results.

Safety protection: It has multiple protections such as over-temperature, low liquid level, overload, and leakage to prevent equipment damage or safety accidents.

GB/T 229-2007/2010,

ASTM E23 “Standard Test Methods for Notched Bar Impact Testing of Metallic Materials”

ISO 148 “Metallic materials -- Charpy pendulum impact test”

EN 10045.

Operation Process

1. Preparation: Place the equipment on the level ground and ground reliably; Check the refrigeration system and pipelines for leakage; Inject the adapted medium (ethanol/methanol below -50°C, liquid nitrogen at -196°C), and the liquid level should be submerged in the sample rack.

2. Power on: turn on the power supply and turn on the main switch; Set the target temperature (e.g. -40°C, -60°C) by means of a thermostat.

3. Cooling and insulation: The equipment automatically starts cooling and stirring, and after the temperature stabilizes at the set value, it is kept warm for 15~30 minutes (to ensure uniform medium temperature).

4. Packing: Put the specimen into the specimen basket, slowly immerse it in the medium, and continue to keep warm (the standard requires a holding time of ≥ 15 minutes, and the thick specimen needs to be extended).

5. Sampling test: After reaching the heat holding time, quickly take out the sample (≤ 5 seconds to avoid temperature rise) and immediately put it into the impact testing machine for testing.

6. Shut down: After the test, set the temperature to room temperature, and turn off the power supply after the medium temperature rises. Discharge media (or seal storage) and clean the liner.

Temperature requirements: conventional low temperature (-40°C~ room temperature) optional single-stage refrigeration; Deep and low temperature (-80°C~-100°C) is used for overlapping refrigeration; Ultra-low temperature (-196°C) liquid nitrogen selection for auxiliary cooling.

Sample volume: 20 sample selection tanks ≤ a single day (10~20 samples); Large tanks (30~50 pieces of sample) are selected for batch testing.

Environmental conditions: laboratory power supply stable power selection and refrigeration type; If there is no power supply or need to be cooled quickly, choose the liquid nitrogen type.

Supporting requirements: According to the specimen size of the impact testing machine, select the appropriate specimen basket and inner tank specifications.

Main technical specification

Model	DWC-40	DWC-60	DWC-80	DWC-100
Adjustable temperature range	-40℃	-60℃	-80℃	-100℃
Accuracy	＜±0.5℃
Chamber dimensions	120×120×80mm
Contain specimen quantity	Max. 120 pcs
Cooling method	Compressor
Cooling medium	Ethanol or other non-freezing liquid
Model	DWC-196
Temperature range	0. ~ -196℃
Temperature accuracy	<±1℃
Control cabinet dimension(LHW)	1400×650×850mm
Effective cooling space(LHW)	120×120×80mm
Accommodation specimen number	120 pcs (10×10×55mm)
Digital counter	1sec to 99 min
Cooling method	Liquid nitrogen
Cooling medium	Ethanol or other non-freezing liquid
Power	220V ~ 240V，50Hz，1.5kW

Main accessories

Frame	1 set
Power cord	1 pc
Halogen lamp	2 pcs
Plane glass plate	1 pc
Documents (Manual, packing list, certificate)

Ethanol or other non-freezing liquid

Cooling chamber: 120 pcs (10×10×55mm)

Specimen Tong

Main Useage / Safety points / Maintenance

Provide specimens that meet the temperature requirements for the low-temperature impact test of metal materials, and simulate the impact resistance of materials in low-temperature environments.

It is used in physical and chemical laboratories in metallurgy, steel, boiler pressure vessels, aerospace, vehicle and ship manufacturing, machinery manufacturing, scientific research institutes and other fields.

It is suitable for various pendulum impact testing machines to detect key indicators such as toughness and brittleness transition temperature of steel, alloys and other materials at low temperatures.

Safety points

The selection of medium should match the temperature range to avoid freezing or volatilization too quickly; When operating the liquid nitrogen type, you need to

wear anti-freeze gloves and goggles to prevent frostbite.

It is forbidden to open the door of the incubator during the operation of the equipment to avoid cold leakage and frosting; Check the refrigeration system pressure regularly to prevent leaks.

It is strictly forbidden to place flammable and explosive materials in the equipment; When the over-temperature alarm is alarmed, it is necessary to stop the machine immediately for inspection, and it can be restarted after troubleshooting.

The specimen should be dried and put into the medium to avoid freezing the medium affecting the cooling effect. Gentle action when picking up and placing the specimen to prevent media splashing.

Maintenance

Daily: check the liquid level and purity of the medium before starting the machine, and replenish it when it is insufficient; clean up the residual specimens or impurities of the liner; Check whether the mixing system is running normally.

Weekly: Clean the equipment shell and condenser heat sink (to avoid dust accumulation affecting heat dissipation); Check whether there is any leakage in the pipeline joint; Calibrate the accuracy of the thermostat.

Monthly: check the compressor lubricating oil level and replenish it if necessary; clean the sealing strip of the incubator door and keep it well sealed; Test the security protection function.

Quarterly: leak detection and maintenance of the refrigeration system; Replace the medium (if the media is cloudy and the purity decreases); Check the wear of the motor and mixing paddle.

Long-term deactivation: Discharge all media, clean the liner and dry; Turn off the power supply and cover the dust cover; Regularly turn on the engine for 30 minutes to maintain the refrigeration system.

Frequently Asked Questions and Countermeasures

issue	cause	countermeasure
Slow cooling speed	Insufficient medium / low purity, poor heat dissipation of the condenser, high ambient temperature	Replenish/change media, clean condensers, improve laboratory ventilation
Poor temperature control accuracy	Calibration offset of the thermostat, stirring system failure, and uneven medium	Calibrate the temperature controller, overhaul the mixing motor, mixing paddle, and extend the heat holding time
The equipment is not cooled	Compressor failure, refrigerant leakage, and unstable power supply voltage	Stop the compressor to check the compressor, contact professionals to detect leaks and fluoride, and stabilize the power supply
Poor insulation effect	Door seals are aged, insulation is broken, and doors are opened frequently	Replace the sealing strip, repair the insulation layer, and reduce the number of door openings