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ORT's Environmental Test Methods For Oceanographic Instruments. Part 8: Change Of Temperature Test


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

Ⅰ. Basic situation of temperature changing test standard

The name of the temperature changing test standard:

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, test method 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.

Test Method 1: Stepped temperature change of temperature changing test

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 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.

Environmental Test Methods For Oceanographic Instruments

Figure 1 Schematic diagram of stepped temperature change

Test Method 2: Rapid temperature change of temperature changing test

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.

ORT Environmental Test Methods For Oceanographic Instruments


Figure 2 Schematic diagram of rapid   temperature change


Ⅱ. The failure mode of the temperature change test

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.


Ⅲ. Characteristics of temperature changes in the marine environment

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.

Ⅳ. Temperature change test capability of ORT

The device name/model

Technical specification

The Thermal Shock Test Chamber

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

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

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.jpg

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

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 In Constant Temperature And Humidity Chamber

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



Ⅴ. ORT participated in the drafting of the published temperature changing test standards

The units involved in drafting temperature changing test standards

Tic Testing Drafting Standards


“Shenzhen ORT Technical Services Co., Ltd.”


1. GB/T 35774-2017《运输包装件性能测试规范》

GB/T 35774-2017《Standard practice for performance testing of shipping containers》

2. GB/T 4857.1-2019《包装 运输包装件基本试验 第一部分:试验时各部位的标示方法》

GB/T 4857.1-2019《Packaging. Basic tests for transport packages. Part one: Identification of parts when testing》

3. GB/T 4798.1-2019《环境条件分类 环境参数组分类及其严酷程度分级 第1部分:贮存》

GB/T 4798.1-2019 《Classification of environmental conditions. Classification of groups of environmental parameters and their severities. Part one: Storage》

4. GB/T 2421-2020《环境试验 概述和指南》

GB/T 2421-2020《Environmental testing. General and guidance》

5. GB/T 2423.27-2020《环境试验 第2部分:试验方法 试验方法和导则:温度/低气压或温度/湿度/低气压综合试验》

GB/T 2423.27-2020《Environmental testing. Part two: Test methods.Test method and guidance: Combined temp. or temp. and humidity with low air pressure tests》

6. GB/T 2423.51-2020《环境试验 第2部分:试验方法 试验Ke:流动混合气体腐蚀试验》

GB/T 2423.51-2020《Environmental testing. Part two: Test methods. Test Ke: Flowing mixed gas corrosion test》

7. GB/T 32065.8-2020 《海洋仪器环境试验方法 第8部分:温度变化试验》

GB/T 32065.8-2020《Environmental test methods for oceanographic instruments. Part 8: Change of temp. test》

8. GB/T 32065.10-2020《海洋仪器环境试验方法 第10部分:盐雾试验》

GB/T 32065.10-2020《Environmental test methods for oceanographic instruments. Part 10: Salt fog test》

9. GB/T 4797.9-2021《环境条件分类 自然环境条件 贮存、运输和使用过程中测得的冲击和振动数据》

GB/T 4797.9-2021《Classification of environmental conditions. Natural environmental conditions. Shock and vibration data measured during storage, transportation, and use》

10. GB/T 2423.33-2021《环境试验 第2部分:试验方法 试验Kca:高浓度二氧化硫试验》

GB/T 2423.33-2021《Environmental testing. Part 2: Test Method. Test Kca: High concentration sulfur dioxide》

11. GB/T 2423.18-2021《环境试验 第2部分:试验方法 试验Kb:盐雾、交变(氯化钠溶液)》

GB/T 2423.18-2021 《Environmental testing. Part 2: Test methods. Test Kb: Salt mist, cyclic(sodium chloride solution)》

12. NB/T 10279-2019《输变电设备 湿热环境条件》

NB/T 10279-2019《Heat and hot environmental conditions for power transmission and transformation equipment》

13. NB/T 10280-2019《电网用状态监测装置 湿热环境条件与技术要求》

NB/T 10280-2019《Condition monitoring device for power grid, Humid and hot environmental conditions and technical requirements》

14. YZ/T 0174-2020《冷链寄递保温箱技术要求》

YZ/T 0174-2020《Technical requirements for cold chain delivery incubator》

15. T/CPF 0012-2020 《快递小型运输包装件试验导则》

T/CPF 0012-2020《Test guidelines for express small transport packages》

16. T/CPF 0011-2020《电商物流大家电运输包装件试验导则》

T/CPF 0011-2020《E-commerce logistics test guidelines for major appliances transport packages》

ORT TIC Testing Drafting Standards