What are the problems that need to be paid attention to when purchasing a constant temperature and h

1. Size selection.

General constant temperature and humidity chamber size according to the size of the test product to decide, according to the requirements of the national standard GB2423, the size of the test studio should be greater than or equal to 3 times of the test product, the effect of the test is the most ideal, and your product is 300 wide 250 long 180 high mm, if the number of test products is not much, 408L (studio 600x850x800mm) is enough, of course, you can choose larger, you can do the test in multiple layers;

Second, the choice of power supply.

If the temperature is below -40 degrees, and the box is above 225L, it is recommended to choose a 380V four-phase power supply excuse, because this is more stable for the electricity consumption of the whole laboratory, and it is also good for the life of the equipment itself;

3. Air-cooled and water-cooled options:

It is enough to use air-cooled constant temperature and humidity chamber in constant temperature and humidity chamber, and the rapid temperature rise and fall testing machine in large constant temperature and humidity chamber or large box is generally used in water-cooled chambers.

Fourth, the use environment of constant temperature and humidity box.

1).Allowable operating temperature range 0 35

2).Performance Guarantee Range: 5 35

3).Relative humidity: not more than 85%.

4).Atmospheric pressure: 86 106kpa

5).There are no strong vibrations around.

6).No direct sunlight or other heat sources.

7).Natural drains: There must be no protrusions in the middle of the drain pipes, and there must be no extreme inclination of the floor of the house.

1. When installing and setting the machine, be careful not to let dust, threads, iron filings or other things enter, otherwise misoperation or failure will occur.

2. The wiring must be correct and must be grounded. Failure to ground may cause electric shock, malfunction accidents, abnormal display or large measurement errors.

3. Regularly check the terminal screws and fixing frame, please do not use them when they are loose.

4. During the operation of the instrument, the power supply terminal cover must be installed on the terminal board to prevent electric shock.

5. In the operation of the instrument, the safety should be fully considered before modifying the setting, signal output, starting, stopping and other operations, and the wrong operation will cause damage or failure of the working equipment.

6. Please use a dry cloth to wipe the instrument, do not use alcohol, gasoline or other organic solvents, do not splash water on the instrument, if the meter is immersed in water, please stop using it immediately, otherwise there is a risk of leakage, electric shock or fire. Self-lubricating bearings.

7. The internal parts of the instrument have a certain life period, in order to continue to use the instrument safely, when you want to regularly maintain and maintain this product, please dispose of it according to industrial waste.

8. In order to avoid machine failure, please provide the power supply within the rated voltage range.

9. In order to prevent electric shock or malfunction and failure, please do not turn on the power supply before the installation and wiring are finished.

10. This product is a non-explosion-proof product, please do not use it in a bad environment with flammable or high-quality gases.

11. Never disassemble, process, modify or repair the machine without authorization, otherwise there will be a risk of abnormal action, electric shock or fire.

12. The ventilation holes of the body should be kept unobstructed to avoid malfunction, abnormal operation, reduced life and fire.

13. If the machine is found to be damaged or deformed when unpacking, please do not use it.

When choosing to purchase a high and low temperature test chamber, you should choose the appropriate test equipment according to the different conditions of the test products. The most important thing to consider is to maintain a reasonable ratio between the test sample and the effective volume of the test chamber.

The volume of the heat test sample should not be more than one-tenth of the effective volume of the test chamber.

The volume of the non-heating test sample should not be greater than one-fifth of the effective volume of the test chamber.

For example, when a color TV is not energized for testing, a test chamber with a cubic volume can meet the requirements; When the power is on, it can not meet the requirements, and it should be replaced with a larger test chamber, because the TV needs to emit heat dissipation when working, if the space is not enough, the circulation channel is too small, and the testing machine is difficult to ensure the uniformity of temperature in the test area through the air duct circulation.

Macroscopically.

First, the basic performance.

In order to ensure that the performance of the test chamber meets the required performance indicators, the user can ask a third party (national technical supervision or measurement unit) to carry out acceptance. In the case of third-party acceptance, the cost of the first acceptance and certification is generally borne by the user; When the first acceptance is unqualified, the manufacturer shall re-debug or change the design, and the acceptance fee shall be borne by the manufacturer.

2. Reliability:

The practical application shows that after the high-performance imported compressors, refrigeration components and controllers, and contactors are generally used, the mechanical failures of the temperature and humidity test chamber are becoming less and less. The main causes of failures are design, workmanship, and maintenance.

3. Security:

The safety of the test chamber involves three aspects: the operator, the test item and the equipment itself.

4. Energy consumption: The energy consumption of the temperature and humidity test chamber is mainly electricity and water.

Power consumption is concentrated in refrigeration compressors, heating, humidification, water pumps, fans, etc., and the current environmental test industry.

5. Maintainability:

In addition to the product design level and manufacturing process, the service life of the environmental test chamber has the greatest impact on daily maintenance and maintenance. Many users do not maintain enough equipment, or even do not understand the project, resulting in frequent failures such as high condensation pressure of the refrigeration system, blockage of the humidification water system, and large deviation of humidity measurement.

The main maintenance items of the temperature and humidity test chamber.

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First, the choice of size must be based on the size of the product you use for your own experiments to determine the size of the test chamber you buy.

Second, the choice of power supply, no matter how many V, must have more than three phases of power interface. And if your temperature is really minus 40 degrees, and your test chamber is above 225L, choose 380 volts and use a four-phase power supply. So as to ensure the stability of electricity and the maintenance of the equipment are better.

Third, the choice of cooling system, in general, it is enough to choose air cooling, and the use of water cooling is generally a relatively large test chamber! There are also many cold and hot test chamber water cooling series.

Fourth, ensure the experimental environment. In order to ensure the accuracy and stability of the experiment, it is necessary to ensure the safety and reliability of the environmental safety interlock.

The test object with different specific heat capacity, or the test object is heated during the test, then the heat absorbed and released will be different when the temperature rises and falls, and the natural requirements for the heating and cooling capacity of the test chamber will be different, which will directly determine the manufacturing cost of the test chamber, and also determine the ** of the test chamber.

Cabinet material, capacity and structure:

The different materials and thickness of the constant temperature and humidity test chamber involve the quality and service life of the equipment, and the production cost will vary a lot, the more complex the structure of the box, the more expensive it will be, the larger the capacity of the box, the higher the production cost, like the production cost of the walk-in constant temperature and humidity test chamber is very high, which is mainly suitable for large-volume product testing.

Temperature range and temperature control requirements:

The temperature range and temperature control requirements that can be achieved by the test chamber are an important factor in whether the product testing requirements and the accuracy of the test can be met, and the equipment required for product testing and testing must be considered in the purchase process, as well as the testing needs in the future, so as to choose the constant temperature and humidity test chamber suitable for the function, the wider the temperature range of the test chamber, the higher the requirements for accuracy, then the temperature control capacity of the test chamber should also be higher, and the cost of production will naturally become higher, and the ensuing ** will be more expensive.