Description

Low Temperature Freezing Test Chamber

1. Purpose & Features

• Frost resistance test of pervious concrete pavement bricks
• Chemical / physical experiments
• Instruments, electrical appliances
• Low-temperature preservation of marine biological samples
• Low-temperature testing of building materials, etc.

2. Technical Parameters

• Capacity: 30L
• Minimum temperature: -50℃
• Power supply: AC220V, 50Hz
• Temperature resolution: 0.1℃
• Ambient operating temperature: 0～23℃
• Relative humidity: ≤75%

3. Structural Features

• Opening mode: Side hinged door
• Insulation: Thickened insulation layer for excellent thermal retention
• Inner tank: Corrosion-resistant alloy plate
• Outer shell: High-quality steel plate
• Intermediate filler: Polyurethane insulation material
• Easy to operate, ideal for laboratory use

4. Notes

• Do not store or operate in damp environments or corrosive gas atmospheres.
• When starting for the first time or after long-term non-use, run the unit for 2 hours before testing to ensure accurate data.
• Turn off the power switch immediately in case of power failure; allow an interval of more than 30 minutes before restarting to avoid compressor damage.
• The unit must be supervised by personnel during laboratory operation.
• Prolonged operation when not in use is strictly prohibited.
• Tilt angle during transportation ≤45°; remove all packaging before use.
• Keep a distance of ≥50cm from the rear wall and ≥15cm from side walls. Place in a well-ventilated, dry area away from direct sunlight, water sources, heat sources, magnetic fields, and volatile/corrosive substances.
• Use an independent socket with current capacity ≥10A and reliable grounding.
• Applicable voltage: AC220～242V/50Hz. If voltage is unstable, install a voltage stabilizer of more than 5 times the input power, adjusted to 220V/50Hz/15A. The unit must be grounded.

5. Freezing Instructions

• Leave gaps between samples and between samples and the inner tank to ensure air circulation and uniform cooling.
• High-humidity or easy-dehydration samples must be wrapped in sealed food bags or plastic wrap to prevent frost buildup affecting cooling performance.
• Storage of volatile, flammable, explosive materials, strong acids, strong alkalis, gasoline, alcohol, etc., is strictly prohibited.
• Do not overload with excessive samples at one time to avoid slow cooling and continuous compressor operation.
• After testing, cut off power, remove samples, open the door for natural defrosting, drain water, and wipe the inner chamber dry with a soft cloth.

6. Operating Instructions

• Read the manual carefully before use.

Pre-operation Check

• Use an independent grounded power socket; ensure voltage 220～240V, frequency 49～51Hz.
• Confirm the panel switch is in OFF position.

Startup

Operation

Shutdown

7. Maintenance & Care

• Clean the inner chamber after each test. Disconnect power and remove items before cleaning; wipe off dirt and moisture.
• Do not use boiling water, acidic agents, or chemical thinners.
• Wipe dry after cleaning.
• Gently clean the door gasket with mild soapy water.
• Clean the outer shell with clean water or a small amount of neutral detergent; avoid wetting the power cord and lower wiring to prevent electric leakage.

8. Troubleshooting

• Indicator off, no display: Check power supply and plug.
• Indicator on, compressor not working but humming: Low voltage; install a stabilizer of more than 5 times input power.
• Compressor stops within 1 minute and restarts repeatedly: Abnormal voltage; handle as above.
• Compressor runs normally but cools slowly: Frequent/improper door closing; excessive or improperly placed samples; frost buildup inside.
• Excessive noise: Unstable placement; loose fasteners; contact between cooling tank and compressor.