Winter protection measures of environmental test chamber and how to choose antifreeze

Why do you need to do freezing work?

If the ambient temperature is too low, the circulating cooling water pipes may freeze. Once frozen, the pipes may freeze and crack, causing water leakage and refrigerant leakage, and damaging the water pump and compressor. For the safety of the equipment, please pay attention to the ambient temperature of the equipment and supporting cooling water system, and take the following protective measures:

When the ambient temperature is around 0℃, such as Shanghai, Hunan, Hubei, Sichuan, Chongqing and other places in the Yangtze River Basin, keep the cooling water circulation system running when the equipment is shut down to ensure the continuous circulation of water.

If the ambient temperature is below -10℃, such as Shaanxi, Shanxi, Shandong, Gansu and other places in the Yellow River Basin and Northeast China, please add anti-freeze solution below -30 ℃. The use of antifreeze please refer to the selection and addition of antifreeze below. If the equipment does not run for a long time, for safety, please empty the water in the cooling water system and blow out the residual water in the pipeline with compressed air.

Note: There is no need to empty if antifreeze is used

Reasonable addition of antifreeze is the key to antifreeze

Now on the market there are a variety of different kinds of different formula of antifreeze, so many customers do not know how to choose, deployment, or have chosen some of the antifreeze is not suitable for our equipment.

The equipment of Cering has certain requirements for antifreeze. If the wrong selection or improper use will damage the internal pipeline of the equipment, the performance requirements of antifreeze are as follows :1. Stable chemical performance

2, good anti-freezing performance 3, low temperature viscosity is not too large 4, corrosion and rust resistance

5, no swelling and erosion performance of rubber sealing conduit

Comparison of advantages and disadvantages of common antifreeze on the market:

Constant temperature and humidity test chamber

At home and abroad most of the use of ethylene glycol water-based antifreeze, this type of antifreeze can be in accordance with the environmental temperature requirements, directly choose the appropriate proportion of antifreeze use. And antifreeze mother liquor, that is, concentrated type is generally not directly used, but should be according to the requirements of the use of temperature, with softening water modulated to a certain concentration can be used. Let's introduce the use of glycol antifreeze.

☆ Antifreeze can not be used directly after purchase, it is necessary to add deionized water in proportion as follows:

The lowest temperature in the local history should be used as the standard, and the ratio should be combined with the actual situation.

1-36℃ ~-45C6:4 (60% antifreeze :40% deionized water)

2-24℃~-35C5:5(50% antifreeze :50% deionized water)

3-16℃~-23℃4:6 (40% antifreeze :60% deionized water

)-6° C ~-15C3:7 (30% antifreeze :70% deionized water)

-1℃ ~-5C 2:8 (20% antifreeze :80% deionized water)

☆ It is recommended to add the concentration of not less than 30% in actual use

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