How to control the ozone concentration in the ozone aging test chamber

Ozone aging test chamber is mainly used in rubber industry; According to the test method and standard, it can be divided into “static” and “dynamic”. Static generally refers to putting the test piece into the test chamber for test after being stretched, and dynamic means putting the sample on the fixture of the test chamber, and doing the test while stretching. The outer box of the equipment is made of high-quality A3 steel plate sprayed with plastic, with a bright and beautiful appearance; The editor will briefly explain to you today the control of ozone concentration;

The ozone generation in the ozone aging test chamber is mainly produced by using the ozone generator. Our company uses the high-voltage silent discharge tubular ozone generator and some oxygen in the air to decompose and polymerize into ozone. The ozone concentration is 20~1000 pphm (set as low concentration) or 5~500M (high concentration). The ultraviolet detector will continuously detect the ozone concentration online, and then feed the data back to the ozone generator control system, The control system can effectively control the occurrence of ozone according to the set value. Our company uses the classical chemical titration method, which can be compared with the instrument value, so as to ensure the minimum ozone concentration and error;

The temperature control system adopts an integrated ozone concentration, temperature and humidity controller with high integration and reliability. The LED display shows that the resolution path temperature is 0.1 ℃, humidity is 0.1% R.H, and ozone concentration is 1 pphm; PID set value control, simple and convenient operation; Standby classic chemical test ozone concentration interface, convenient for calibration, analysis and test;

Why the rubber industry cannot leave the ozone aging test chamber?
Rubber products are almost everywhere, such as our car tires, sealing products, plastic toys, rubber gloves, etc. If there is any problem in quality and performance, it will bring great losses to people. Therefore, the ozone aging test box is now useful. It is mainly used to simulate or accelerate the aging scenario of ozone in the atmosphere on rubber, Used to identify the weather resistance of the product;

The main causes of rubber problems include temperature, light, ozone, moisture, etc. In order to test the weatherability of ozone products, the damage of moisture and humidity to materials has been paid attention to. Various corrosive gases caused by increasingly developed industries are mixed in the air. For example, ozone is a severe test of products, which will cause cracking, degradation, hardening, pulverization and other damage to rubber products, Because the use of ozone weathering test will rise, we say that the rubber industry is completely inseparable from the ozone aging test chamber.
The above is why the rubber industry cannot leave the ozone aging test chamber. It is also because of the equipment, the unnecessary loss of rubber is reduced, so its later use is still very large.

Different test methods of ozone aging test chamber:
There are two types of ozone aging test chamber, one is dynamic test, the other is static test,
Static ozone aging chamber: fix the two ends of the sample with clamps under the required elongation. When contacting with ozone air, the direction of the sample length should be basically parallel to the direction of the air flow; The rotation speed of the sample holder is between (20~25) mm/s. In the plane perpendicular to the air flow, each sample should move continuously along the same path. The time for the same sample to rotate for one cycle is generally (8~12) min.

Dynamic ozone aging chamber: It is a continuous cyclic tensile test with the elongation of the sample from zero to the maximum elongation; This method has two test methods:
① Let the sample stretch from zero to the maximum elongation. We recommend that the maximum elongation of the sample stretch is 10%, and the exposure time is set as 72h;
② Intermittent dynamic tensile test, this test method is to make the sample elongation from zero to the maximum elongation, and then fix the sample at the maximum elongation after a certain time, and then continue to expose it in the same ozone-containing air under the static tensile state; The test of alternating exposure of dynamic tension and static tension shall be conducted periodically according to the requirements of the tester.

Maintenance method using ozone aging test chamber:
1. Before using the ozone aging test chamber, ensure that it is grounded safely to avoid the problem of electrostatic induction;
2. The overtemperature protector and circuit breaker, which provide protection measures for the safety of the user of the testing machine, must be regularly and carefully inspected;
3. The condenser shall be cleaned every three months. If the compressor is air-cooled, the condenser fan shall be regularly serviced and the condenser shall be decontaminated to ensure its good ventilation and heat exchange performance; For water-cooled compressors, in addition to ensuring the inlet water pressure and temperature, the corresponding flow rate should also be guaranteed, and the inside of the condenser should be cleaned to obtain its continuous heat exchange performance;
4. Insist on the operation and maintenance of the equipment by special personnel, and units with conditions can also send special personnel to the manufacturer to learn from time to time to gain more professional maintenance and repair experience and ability;
5. The ozone aging test chamber is generally relatively high. We recommend that it be placed in a relatively benign temperature environment. Our temperature values: temperature range: RT+10~65 ℃, temperature fluctuation: ± 0.5 ℃, temperature uniformity: ± 2 ℃, ozone concentration: 10PPHm~1000PPHm; Generally speaking, if your laboratory does not have this condition, it needs proper air conditioner or cooling tower;

Small maintenance of ozone aging test chamber plays an important role:
1. The box of the ozone aging test chamber is generally relatively high. We can put it in a relatively benign temperature environment. The empirical temperature is (temperature range: RT+10~65 ℃, temperature uniformity: ± 2 ℃, temperature fluctuation: ± 0.5 ℃, ozone concentration: 10PPHm~1000PPHm). Generally, laboratories that do not have this condition must be properly equipped with air conditioners or cooling towers.

2. Clean the condenser regularly. Generally, air-cooled cooling is the most appropriate way for the compressor. The condenser fan should be regularly serviced and the condenser should be decontaminated and dedusted to ensure its good ventilation and heat exchange performance; For compressors with water-cooled cooling, in addition to ensuring the inlet water pressure and temperature, it is also necessary to ensure the corresponding flow, and regularly clean and descale the inside of the condenser to obtain its continuous heat exchange performance.

Ozone test purpose:
Ozone Test Chamber (or called Ozone Aging Chamber and Ozone Aging Test Chamber) is design according to rubber being sensitive characteristic of to ozone, it simulate the environmental to accelerate the rubber aging process by ozone. It compared to different products(test sample) aging result each other according to the same ozone aging test conditions/standards, and get to comparable aging resistance performance.

Test process:
The ozone aging test is expose the test sample at the closed, non-illuminated constant ozone concentration air and constant temperature test box. The sample is tested at predetermined time, to evaluate ozone aging resistance through the sample’s cracks degree or other measured performance change. Ozone aging included static tensile test and dynamic tensile test. The ozone concentration, temperature, humidity, and sample tensile ratio are very important parameters in this aging test.

OTC-015A_Ozone Test Chamber

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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