Ozone Resistance Test Device Conforming To IS 10810 (Part 13), IEC 60811-403, ASTM D 470, IS 3400 (Part 20) : 1994, ISO 1431-1/1994 And ASTM 4575.

I. Standards

Conforming to IS 10810 (Part 13), IEC 60811-403, ASTM D 470, IS 3400 (Part 20) : 1994, ISO 1431-1/1994 and ASTM 4575.

Ii. Overview
It IS used to estimate the resistance of elastic and polymer materials of cables to ozone erosion in accordance with IS 10810 (Part 13), IEC 60811-403, ASTM D 470, IS 3400 (Part 20) : 1994, ISO 1431-1/1994 and ASTM 4575. The test apparatus should include a test chamber, an ozone generator with a high-voltage power supply and controller, an air dryer/purifier, a flow meter control unit, a temperature control box, glassware, a specimen carrier for chemical detection, and an ozone detection device

Iii. Technical Parameters
1) The test chamber should be made of materials that do not react with ozone, preferably stainless steel.
2) The volume of the test chamber should be at least 60 liters, and it should be a refrigerated box, providing both heating and cooling
3) The temperature of the test chamber should be controlled by an electronic digital temperature indication controller using a PT-100 sensor.
The required temperature range is from 10°C to 80°C, and the control accuracy is better than ±1°C
5) The inner cavity should be accessible through a door with an appropriate closing mechanism and seal to prevent partial pressure loss or adverse effects on the ozone concentration level throughout the test period.
6) The door must be equipped with a device or interlocking mechanism to prevent accidental opening during the expected duration of the test.
7) The inspection door should be equipped with an observation window made of tempered glass and should be sealed to prevent partial pressure loss or adverse effects on the ozone concentration during the test.
8) The inner cavity can be equipped with a light source for observing the sample in the middle.
9) The inner cavity can be equipped with a rack or shelf for placing samples. The material of the rack should not react with ozone, and stainless steel is preferred. The design of the rack should minimize its impact on the introduction, circulation, exchange or discharge of the air-ozone mixture.
10) It is required to provide devices for generating, measuring and controlling the concentration and partial pressure of the air ozone flow, and when the air ozone flow is introduced into the chamber, the stratification of ozone should be prevented.

Iv. Ozone Generator
1) The ozone generation source should be located outside the test chamber, and foreign substances in the airflow must be thoroughly filtered.
2) The ozone generator should have concentric electrodes separated by thin glass dielectrics, with voltage applied between the electrodes.
3) This generator can be powered by a high-voltage transformer, with a maximum voltage range of 20-30 kV, an output current of 8 mA, and is equipped with a voltage variation control device. The accuracy of the high-voltage transformer should be ±1%.
4) The ozone generator assembly should be installed in a wooden box to ensure the complete safety of the operator.
5) The ozone concentration should be directly measured using an ozone meter or ozone analyzer/ozone detector device. The ozone concentration in the test chamber should be 25 to 500 pphm (parts per million) or ppb (parts per billion), and the selectable range of the ozone meter should be 25 to 500 pphm/ppb
6) In addition to the ozone detector/ozone analyzer, all the accessories required for the chemical method should also be provided for verification.

V. Air Supply:
1) The air source should come from the environment or compressed air supply and be fully filtered or filtered by an air dryer to remove moisture from the air
2) A humidity indicator composed of reusable humidity indicator gel should be provided.
3) The flow rate of air with the required ozone concentration should be between 280 l/h and 560 l/h, and the air pressure should be maintained slightly higher than the atmospheric pressure.
4) Flowmeters with control devices: They should be capable of very precise regulation of air flow within the range of 2 to 20 liters per minute.

Vi. Circulating Fan
To circulate the ozone mixture, an electric fan that can maintain a constant speed throughout the entire test process should be provided.
The speed measured from the leading edge of the fan blades on the side of the fan chamber at 50mm shall not be less than 0.6m /s.
3) The fan motor must not be located indoors. The fan motor should have an extension shaft or drive mechanism to isolate the motor from the inner cavity.
4) The fan blades should be embedded in the air chamber and separated or enclosed by protective nets or grid-like cages.

Vii. Glassware:
Collect ozone gas and determine the ozone concentration by chemical analysis method.

Viii. Specimen Holder:
1) A mechanical rotating bracket of sufficient size should be installed in the test chamber, and a fixture or frame for fixing the sample should be installed on it.
2) The specimens should be moved in a plane perpendicular to the airflow at a speed of 20 mm/s to 25 mm/s. The movement mode should ensure that the same specimens reach the same position in the test chamber every 8 to 12 minutes.

Ix. Exhaust System:
1) The test chamber should be equipped with an appropriate exhaust system and ozone destruction devices, such as catalytic devices.
2) The exhaust system must operate in such a way that the air-ozone mixture from the test chamber must be exposed to an appropriate ozone destruction device or catalytic device to prevent it from being introduced into the ambient atmosphere.

X. Input Power Supply:
The input power supply for work is 220V+/-10%AC
Frequency: 50Hz+/-3%.

Xi. Calibration
The ozone meter/ozone analyzer, flowmeter, temperature controller and test chamber should be calibrated by a laboratory accredited by NABL (ISO/IEC 17025)

Xii. Demonstration
1) Provide training on the complete operation of equipment and system control devices in accordance with CPRI standards.
2) Demonstrate and verify the functions of the ozone detector device by chemical methods during installation and commissioning.