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The selection and use of laboratory constant-temperature and constant-humidity cabinets require comprehensive consideration of parameter configuration, application scenarios, and operation specifications. The key points are as follows:
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I. Key Points Selected
Capacity and size compatibility
Choose the appropriate capacity based on the volume of the experimental items (such as wine bottles, cigar boxes, etc.). It is recommended that the sample volume does not exceed 1/3 of the cabinet's volume to avoid affecting the uniformity of temperature and humidity.
For example:
Small samples (such as cigars): 50-70L capacity
Medium storage (red wine + cigars): 200-300L capacity (such as Xin Song appliances)
Temperature parameters
Temperature range: The regular requirement is 5-18℃ (for wine) or 18-22℃ (for cigars), and special scenarios need to support -40℃ to 150℃ (such as Xin Song appliances).
Humidity control: The accuracy should reach ±2%RH, and the humidification cabinet should support 50-70%RH (such as Meijing MA50).
Function configuration
Compressor type: The compressor has more precise temperature control (such as Xin Song appliances), and electronic temperature control is suitable for budget-limited scenarios (such as Xin Song appliances).
Material and shelf: The cedar wood shelf (Xin Song appliances) can adjust humidity, and the stainless steel inner tank is easy to clean.
Additional requirements
Embedded design saves space, and double doors facilitate access.
The remote monitoring and data recording functions are suitable for long-term experiments (refer to the selection logic for constant temperature and humidity test chambers).
II. Usage Guidelines
Installation and Preparation
Place it in a well-ventilated area, at least 50cm away from the wall. The power supply must be grounded.
Fill the water tank with distilled water up to the marked line. Check if the humidity sensor's filter is clean.
Parameter Settings
Set the target temperature and humidity through the touch screen. For complex experiments, you can set programmable step parameters (such as Xinsong appliances).
After starting, run for 10 minutes to confirm that the compressor has no abnormal vibration and the humidifier fog is uniform.
Run Monitoring
Record temperature and humidity data every 30 minutes. Check the heater or refrigeration system when the temperature exceeds the set limit.
If the humidity is abnormal, check the water level in the water tank or the blockage of the humidification tube.
Maintenance and Safety
Check the refrigerant pressure monthly. Wear heat-resistant gloves when cleaning the inner container.
Seal any flammable or corrosive items. Press the emergency stop button for a long time in case of an emergency.
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III. Important Notes
Avoiding Misconceptions: In low-temperature conditions (below -40℃), a cascade refrigeration system is required; single-stage refrigeration cannot operate stably.
Compatibility: The electronic equipment should be designed to be anti-static, and the medical testing equipment requires a sterile inner container.