Precautions for testing constant temperature and humidity box and constant temperature and humidity equipment

NOKI Chamber am9:21

Application taboos of constant temperature and humidity box, constant temperature and humidity equipment, and common problems in experiments

such as:

  • Explosive models:

1. The nitration reaction is thick (ethylene glycol dinitrate), nitroglycerin (glycerol trinitrate), nitration reaction methylcellulose, and its flammable nitrate esters.

2. Trinitrobenzene, trinitrotoluene, trinitrophenol (picric acid), and its flammable fluorobenzene chemicals.

3. Performic acid, hydroxyethyl ketone chloroprene, benzoyl peroxide, and other organic chemical chloroprene.

  • Flammable materials:

1. Fire objects:

Metal materials: “lithium”, “potassium”, “sodium”, yellow phosphorus, vulcanized rubber phosphorus, red phosphorus.

Celluloid: calcium carbide (calcium carbide), phosphating lime powder, magnesium powder, alumina powder, sodium hydroxide.

2. Characteristics of metal oxides:

(1) Potassium chlorate, sodium chlorate, ammonium chlorate, and other chlorates.

(2) Potassium peroxide, sodium peroxide, ammonium peroxide, and other peroxy acid salts.

(3) Potassium peroxide, sodium peroxide, barium peroxide, and other inorganic chloroprene.

(4) Potassium nitrate, sodium nitrate, and other phosphates.

(5) Potassium hypochlorite and other hypochlorites.

(6) Sodium chlorite and other chlorites.

  • Flammable items:

(1) Medical ether, car gasoline, hydrogen bromide, air oxidation pe, carbon disulfide, and chemical substances whose ignition point does not reach -30°C.

(2) General hexane, air oxidized butadiene, toluene, benzene, hydroxyethyl ketone, and chemical substances whose ignition point is above -30℃ but below 0℃.

(3) Ethanol, alcohol, dimethyl benzene, amyl acetate, and chemical substances whose ignition point is above 0°C and less than 30°C.

(4) Gasoline, light oil, banana water, isoamyl alcohol, acid vinegar, and chemical substances whose ignition point is above 30°C and less than 65°C.

Dust-proof test chamber to carry out the technical specifications for sand and dust experiments on military machinery and equipment

a) Adjust the temperature of the test ram to the standard atmospheric standard and adjust the gas velocity to the specified value according to the requirements of the technical documentation. Adjust the air humidity value of the test ram to less than 30%, and maintain the environmental humidity value during all the experimental procedures.

b) Adjust the dust control equipment, for example, so that the dust concentration value is 10.6g/m3±7g/m3.

c) Unless otherwise required, maintain the standards of a) and b) for at least 6 hours. If necessary, re-adjust the position of the parts on time so that the other vulnerable parts are exposed to the dust stream.

d) Terminate dust supply. Reduce the wind speed level of the test ram to about 1.5m/s, and adjust the temperature of the test ram to the required temperature of the experiment, or another value specified in the technical document.

e) After the experimental temperature stabilizes, the standard of d) is maintained for 1 hour.

f) Adjust the wind speed level to the speed applied in a), and supply dust from the beginning to maintain the dust concentration value in b).

g) Experiment again for at least 6 hours or according to other requirements. If necessary, operate the test piece as specified in the technical documentation.

h) Bring the test piece back to the standard atmospheric standard and allow the dust to land.

i) Use brushing, rubbing, or shaking to remove dust accumulated on the test piece. Be careful in the actual operation to prevent the introduction of other dust or disturb all the dust that is likely to enter the test piece early, without the need for a blower or vacuum pump to clean up the dust, unless this method is the same as the method selected in the specific application.

j) Carry out work inspections according to technical documents and record the inspection results.

k) Check the test piece to see if there is dust infiltration, especially pay attention to the rolling bearing, the sealing part of vegetable grease, the location of the lubrication, the filter device, the shade, etc. Record the inspection results.

Three-point test regulations for constant temperature and humidity test chamber

1. High-temperature experiment (≥200℃)

Due to the hazards of spare parts and cold and humidity regulations, the general temperature and humidity test box for a generally constant temperature and humidity test box are generally up to 150℃, the lowest temperature is -70℃, and the highest temperature reached by the constant temperature and humidity box on the market is about 180℃. . Therefore, there is no way to carry out such high-temperature experiments in the constant temperature and humidity test box. Generally, the high and low-temperature test boxes must be selected instead!

2. Cold and humid experiment with 100% RH specified as the environmental humidity

This requirement should be considered from the common sense of everyone. The natural environment with an environmental humidity of 100% RH means that the water has already filled all the vessels-that is, there is no natural environment with water vapor, and all is a water environment treatment. So if you show a container filled with water, put it in the product and start the experiment!

3. Cold and damp experiment at ultra-low temperature (≤0℃)

This experimental rule is also the same as the second point. Everyone knows that the freezing point of water is 0°C. In other words, when the temperature is lower than 0°C, the water has already frozen, and there is no water vapor in all-natural environments—— The cold and wet natural environment can no longer be shown, so the cold and wet experiment cannot be carried out. On the other hand, it is very likely to destroy the constant temperature and humidity test box!

It is a manufacturer dedicated to independent research and development, manufacturing, and marketing of quality testing equipment. It is also an authoritative expert in the processing of technical and professional testing instrument plans. Key products include tensile testing machines, tensile testing machines, all-around testing machines, and other structural mechanics inspection testers and their constant temperature and humidity test chambers, thermal and cold shock environmental test chambers, salt spray test machines, and other natural environment inspection testers.

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