IEC 60068-2-60 Flow mixed gas corrosion test chamber

The negative pressure type and corrosion test chamber with protective structure designed for this equipment are for our company's ZHUANLI project (ZL201921679833. X, ZL202223208767.2), which can make the mixed gas flow uniformly inside the chamber to achieve good corrosion effect, ensure that the gas inside the chamber does not leak out, and make use safer.

1IEC 60068-2-60 Flow mixed gas corrosion test chamberReference standard:

IEC 60068-2-60 (GB/T 2423.51-2020) Flow mixed gas corrosion test;

IEC 60068-2-42 (GB/T 2423.19-2013) Sulfur dioxide test for contact points and connectors;

IEC 60068-2-43 (GB/T 2423.20-2014) Hydrogen sulfide test for contact points and connectors.

2、 Technical requirements:

1. Temperature range: 15 ℃~60 ℃

2. Relative humidity: (50-90)% RH

3. Temperature uniformity: ≤ 2 ℃

4. Temperature fluctuation: ≤± 0.5 ℃

5. Test time: 0-9999 hours

6. Sulfur dioxide concentration: 10ppb-30ppm (adjustable)

7. Hydrogen sulfide concentration: 5ppb~15ppm (adjustable)

8. Nitrogen dioxide concentration: 100ppb~500ppb (adjustable)

9. Chlorine concentration: 5ppb~50ppb (adjustable)

10. Gas generation method: cylinder method

11. Gas concentration measurement method: using a formula to calculate the volume ratio, and then measuring with a mass flow meter

12. Experimental gas flow rate: Use an anti-corrosion mass flow meter that can be adjusted according to the test requirements

14. Sample rack: rotating and bracket type

15. Experimental gas volume changes per hour: 3-10 times (adjustable)

16. Operating environment temperature: 5 ℃~30 ℃

17. Operating environment humidity: ≤ 85% RH

18. Power requirements: AC380V/50Hz three-phase five wire system

19. Total power: 14KW

3、 Structural design:

1. The workshop of the equipment is welded with PP corrosion-resistant and flame-retardant sheet metal.

2. The inner box of the equipment is welded with 316L mirror stainless steel plate.

3. The outer shell of the equipment is made of 304 stainless steel plate spray molded.

4. The temperature and humidity of the equipment are controlled by an external temperature and humidity air conditioning cabinet to create a specified temperature and humidity environment that enters the box and circulates inside the box. Design an air conditioning system for the equipment, which includes a refrigeration system, a heating system, and a humidification system. The air conditioning system produces a temperature and humidity that meets the test requirements, and inputs a certain concentration of mixed gas. After mixing evenly in the mixing chamber of the equipment, it enters the box and controls the flow rate to reach the specified range. The concentration can be calculated by calculating the volume ratio through a formula, and then measured and effectively controlled using a mass flow meter to reach the specified range.

5. The equipment heats up quickly and the temperature and humidity are evenly distributed. The heating and humidification element adopts titanium metal heating tubes, which are corrosion-resistant and have a long service life. The box door is made of tempered glass, making it easy to open and close. Using corrosion-resistant silicone rubber seal to ensure that gas does not overflow. The design of the sample frame structure follows national standards and can also use hooks, which have a large load-bearing capacity and are easy to place the test samples. After the gas comes out of the steel cylinder, it is depressurized, filtered by special materials, and then controlled by a corrosion-resistant solenoid valve to enter the mixing box through a mass flow meter. Afterwards, it enters the diversion pipeline at the bottom of the box together with the temperature and humidity air in the air conditioning cabinet, and passes evenly through the box.

6. The equipment can perform mixed gas tests of sulfur dioxide, hydrogen sulfide, nitrogen dioxide, and chlorine gas, as well as single gas corrosion tests of one of the gases. After determining the concentration of the gas to be tested, the inlet flow rates of the corrosive gas and air can be calculated based on the formula, the volume of the equipment working room, and the required air exchange rate for testing. During the experiment, all controls are automatically performed, such as water replenishment, ventilation, air intake, exhaust, drainage, and so on.

7. The device is designed with two inner chambers and two doors. The first door is sealed with silicone rubber to prevent the mixture from escaping; Design another leak proof door outside the first door to ensure that the gas inside the box does not leak out. Double layer sealing, safe and reliable, and the equipment type is a negative pressure structure, which can effectively prevent gas leakage. The components inside the air conditioning room of the equipment are made of anti-corrosion parts, which can effectively prevent damage caused by aging sealing strips after leakage.

8. After completing the test task through the sample, the mixed gas enters the residual gas filter through the pipeline at the top of the box. The specially designed alkali atomization neutralization and adsorption combination gas filtration device inside the filter can quickly and effectively filter the residual gas in the box after the test is completed. The pH value of the residual gas is weakly alkaline, which will not cause pollution to the atmosphere and is easy to operate. After a small amount of condensed water is collected inside the box, it can be centrally treated.

9. Equipped with over temperature protection and low water level warning to ensure safe use.

10. The refrigeration system of the equipment is installed at the bottom of the equipment and is mainly used for constant temperature and humidity.

11. The equipment is designed with a pressure detection device. Once the internal pressure of the equipment exceeds atmospheric pressure, the gas supply system of the equipment stops running and the forced exhaust device is activated to ensure the safety of the test.

12. The equipment control system is designed on the right side of the box and is easy to operate. The installation of equipment has special requirements and must be installed separately in an independent laboratory. No other equipment or instruments are allowed to be placed indoors. After the general equipment is installed, glass is used to separate the equipment from the operation, which not only ensures the personal safety of the staff, but also allows real-time monitoring of the indoor test conditions through the glass. It is recommended to install exhaust devices indoors to maintain air circulation and prevent staff from making mistakes and releasing gas into the laboratory during operation. At this time, indoor ventilation measures can be turned on to replace the leaked gas from the studio and allow personnel to enter the room for operation or inspection. This equipment is also equipped with four types of gas leak alarm devices, which will sound an alarm when gas leaks into the laboratory.

13. The bottom of the equipment adopts four universal Fuma wheels, which can be adjusted horizontally.

4IEC 60068-2-60 Flow mixed gas corrosion test chamberControl system:

1. The temperature, humidity, and flow control instrument adopts an imported 7.0-inch large screen - LCD display, programmable microcomputer PID control, SSR output operation, fully imported large LCD touch screen image, simple screen operation, and easy program editing. The control and operation system of the mixed gas corrosion test chamber is independently developed by our company, with software registration number 2020SR0787362.

2. Temperature and humidity resolution: 0.01 ℃, 0.1% RH;

3. Temperature sensor: PT100 platinum resistance thermometer;

4. Control mode: thermal balance temperature and humidity control mode;

5. The temperature and humidity control adopts the coordinated control of the P.I.D+S.S.R system on the same channel;

6. It has the function of automatic calculation, which can immediately correct the temperature and humidity change conditions, making temperature and humidity control more accurate and stable;

7. The controller operation interface is available in both Chinese and English, and the real-time operation curve can be displayed on the screen;

8. It has a capacity of 10 programs, 100 segments per group, and 999 steps per segment, with a maximum time setting of 99 hours and 59 minutes per segment;

9. Equipped with a USB interface, the test data can be exported to a PC via a USB drive for viewing or long-term storage;

10. The controller has an automatic screen saver function, which better protects the LCD screen during long-term operation (making its lifespan longer).

11. Equipped with digital anti-corrosion gas mass flow meters for various gases, automated control;

12. Equipped with various gas pressure reducing valves;

13. Imported solenoid valves and air oil-water separators;

14. Various anti-corrosion solenoid valves;

15. The execution components are all Schneider brand series products (AC contactors, intermediate relays, circuit breakers).

5、 Refrigeration and dehumidification system:

1. Compressor: 1 set of fully enclosed French Taikang;

2. Cooling method: air cooling;

3. Refrigerant: R404A;

4. The entire system pipeline undergoes a 48 hour leak detection test with ventilation and pressurization;

5. The heating and cooling systems are independent;

6. Internal spiral refrigerant copper tube;

7. Slope evaporator;

8. The dry filter, refrigerant flow window, repair valve, oil separator, solenoid valve, and storage tank are all imported original parts.