The Environmental Test Methods for Oceanographic Instruments. Part 8: Change of Temperature Test drafted by ORT was authoritatively released by the State Administration for Market Regulation
Environmental test methods for oceanographic instruments. Part 8: Change of temperature test
Standard No.: GB/T 32065.8-2020
Focus unit: National Marine Standardization Technical Committee
Executive unit: National Marine Standardization Technical Committee
Competent authority: Ministry of Natural Resources (Marine)
This standard was published on November 19, 2020, and will be implemented on June 1, 2021.
The range of standards:
This standard specifies the test requirements, reliability test methods selection, stepped temperature change, rapid temperature change, and related information for the temperature change test of oceanographic instruments.
This standard is suitable for assessing or determining the adaptability of oceanographic instruments under temperature change conditions, and can also be used as a reference for temperature change environmental tests of its parts and components.
1. During low temperature test, The test sample should be directly put into the low-temperature test chamber that has been stabilized to TA1 without being packaged, not energized and ready to work, and then start the work, and maintain the exposure duration specified in 3.3.2, during the test, the sample should keep working all the time.
2. During high temperature test, Take out the test sample from the low-temperature test chamber, and directly switch to the high-temperature test chamber that has been stabilized to TB2 (20℃) under standard atmospheric conditions, and maintain the exposure duration specified in 3.3.2. During this period, the temperature in the low-temperature test chamber was adjusted from TA1 to TA2 (2℃).
3. Take out the test sample from the high-temperature test chamber, and directly transfer it to the low-temperature test chamber that has been stabilized to TA2 (2℃) under standard atmospheric conditions, and maintain the exposure duration specified in 3.3.2. During this period, the temperature in the high-temperature test chamber was adjusted from TB2 (2℃) to TB1.
4. Take out the test sample from the low-temperature test chamber, and directly transfer it to the high-temperature test chamber that has been stabilized to TB1 under standard atmospheric conditions, and maintain the exposure duration specified in 3.3.2.
5. Take out the test sample from the high-temperature test chamber, and directly transfer it to the low-temperature test chamber that has been stabilized to TA2 (2℃) under standard atmospheric conditions, and maintain the exposure duration specified in 3.3.2. During this period, the temperature in the high-temperature test chamber was adjusted from TB1 to TB2 (20℃).
6. Take out the test sample from the low-temperature test chamber, and directly transfer it to the high-temperature test chamber that has been stabilized to TB2 (20℃) under standard atmospheric conditions, and maintain the exposure duration specified in 3.3.2.
7. The above steps 5.3.1 to 5.3.6 are a complete cycle of stepped temperature changes, as shown in Figure 1.
8. In accordance with the number of cycles specified in 3.3.4, continue to carry out subsequent cycle tests.
9. After the last cycle is over, the test sample should be taken out of the high-temperature chamber to start the recovery.
Figure 1 Schematic diagram of stepped temperature change |
1. The test sample should be directly put into the low-temperature test chamber that has been stabilized to TA1 without being packaged, not energized and ready to work, and then start the work, and maintain the exposure duration specified in 3.3.2, during the test, the sample should keep working all the time.
2. Take out the test sample from the low-temperature test chamber, and directly transfer it to the high-temperature test chamber that has been stabilized to TB1 (20℃) under standard atmospheric conditions, and maintain the exposure duration specified in 3.3.2.
3. The above steps 6.3.1 to 6.3.2 are a complete cycle of rapid temperature changes, as shown in Figure 2.
4. In accordance with the number of cycles specified in 3.3.4, continue to carry out subsequent cycle tests.
5. After the last cycle is over, the test sample should be taken out of the high-temperature chamber to start recovery.
Figure 2 Schematic diagram of rapid temperature change |
At present, it is known that oceanographic instruments are subject to the influence of climate and environment during storage, transportation, and use, and induce a variety of faults and failures. Years of statistical data show that in the use environment of oceanographic instruments, temperature factors account for up to 35% of failures. In particular, water meters are more susceptible to temperature effects during the transition phase between different areas on and underwater, which can cause malfunctions. Therefore, a reasonable temperature change test can more truly reflect the environment and failure modes encountered by the instrument and equipment, and more fully stimulate the hidden defects, faults, and failures of the product.
Temperature changes usually have a more serious impact on the parts close to the outer surface of the instrument. The farther away from the surface, the slower the temperature change and the relatively small impact. Sudden temperature changes may temporarily or permanently affect the performance of the instrument. The following are examples of failures that may occur when the instrument is exposed to an environment with temperature changes.
1. Typical physical effects
Fragmentation of glass containers and optical instruments; clamping or slack of moving parts; different shrinkage or expansion rates and induced strain rates of different materials; deformation or rupture of parts; surface coating cracks; airtight cabin leakage; Insulation protection failure, etc.
2. Typical chemical effects
The chemical components are separated; the protection of chemical reagents is invalid, etc.
3. Typical electrical effects
Changes in electrical and electronic components; rapid condensation or frost causing electronic or mechanical failures; excessive static electricity, etc.
This standard expands the scope of application to marine wading instruments and marine measuring instruments frequently used alternately in high and low-temperature environments. Among them, the wading instrument still uses the traditional 4 temperature point gradual test method, and the ocean measuring instrument that is frequently used in high and low-temperature environments is planned to use the low temperature/high-temperature direct conversion test method. And this standard mainly considers work adaptability, highlighting the normal working performance test of the instrument under the condition of temperature change.
For water-entry instruments, they will experience high temperatures caused by exposure to the sun in summer, low temperatures in winter, and then directly enter the water. At this time, the water surface temperature is about 20℃, and the deep-sea temperature is about 2℃. The instrument will experience these four test temperature points.
For marine measuring instruments that are frequently used in high and low-temperature environments, they are at a room temperature of 20℃ to 30℃ in the cabin, and they will directly transition to a low-temperature environment within 1 to 2 minutes during winter or when sailing in the north and south poles. For instruments mounted on ships or buoy carriers, when they are exposed to sunlight and reach high temperatures, they will experience rapid precipitation and a drop in temperature.
The device name/model | Technical specification |
The thermal shock test chamber | 1) Internal volume(mm): 700*700*650 2) Max. A load of basket: 50kg 3) Temperature range: Hot chamber: +40℃ to +180℃ Cold chamber: +60℃ to -70℃ 4) Changeover time: 10s 5) Temperature undulation: ±0.5℃ |
Rapid temperature change test chamber | 1) Inner dimension(mm): 1000*1000*1000 2) Temperature range: -70℃ to +180℃ 3) Humidity range:10%RH-98%RH 4) Temperature undulation: ≤±0.5℃ 5) Cooling rate: ≥20℃/min 6) Temp. Heat-up rate: ≥20℃/min |
Rapid temperature change test chamber | 1) Inner dimension(mm): 1000*1000*1000 2) Temperature range: -70℃ to +150℃ 3) Humidity range:25%RH-98%RH 4)Temperature undulation: ≤±0.5℃ 5) Cooling rate: ≥20℃/min 6) Temp. Heat-up rate: ≥20℃/min |
Walk-in Temp. & Hum. chamber | 1) Inner dimension(mm): 1980*1970*2100 2) Temperature range: -40℃ to +100℃ 3) Cooling rate: 0.8℃/min 4) Temp. Heat-up rate: 1℃/min 5) Humidity range: 10%RH-95%RH 6) Temperature undulation: ≤±0.5℃ 7) Temperature uniformity: ≤2℃ |
Walk-in Temp. & Hum. chamber | 1) Inner dimension(mm): 3000*2000*2500 2) Temperature range: -40℃ to +100℃ 3) Cooling rate: 1℃/min 4) Temp. Heat-up rate: 2℃/min 5) Humidity range: 30%RH-95%RH 6) Temperature undulation: ≤±0.5℃ 7) Temperature uniformity: ≤2℃ |
Walk-ni constant temperature and humidity chamber | 1) Product model: WRM-18M-40-W 2) Nominal content product: 18M3 18000L 3) Size of inner box: 3000*2000*3000mm 4) Temperature range: -40℃ to +100℃ 5) Temperature uniformity: ≤2℃ 6) Temp. Heat-up rate: 2℃/min 7) Cooling rate: 1℃/min |
The units involved in drafting temperature changing test standards
“Shenzhen ORT Technical Services Co., Ltd.”
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