Oriental Instruments & Dongyi Technology
Targeting global production of helium leak detection equipment; independently developed quality flow meter filling machines, with customers spread across various domestic refrigeration enterprises, enjoying high recognition in the industry.
Oriental Instruments & Dongyi Technology
Refrigerant charging machines are used in industries such as air conditioning, refrigerators (cabinets), water dispensers, and automotive air conditioning; the specially developed power supply is applied to vacuum equipment and charging equipment, such as coating machines, high vacuum exhaust equipment, and electric vehicle charging stations.
About Us
Specialized in the production of global helium leak detection equipment; independent development of mass flow meter metering method filling machine, customers all over the domestic refrigeration enterprises
Develop new products with high and new technology, so that products develop in depth and breadth to meet market demand
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Chengdu Oriental Instruments Co., Ltd. is located at No. 199, Section 2, Chongsuan Avenue, Economic Development Zone, Chongzhou City, Chengdu. The company enjoys a beautiful environment and convenient transportation. It was established in Chengdu in 1993 under the name “Chengdu Dongfang Instruments Factory,” and its predecessor was the state-owned Chengdu Semiconductor Materials Factory. The company began manufacturing roll-to-roll vacuum coating equipment in 2013 and now possesses 13 years of experience in the technology, design, and manufacturing of such equipment. The company’s main products include: automatic nitrogen leak detectors, nitrogen filling and recovery systems, vacuum roll-to-roll coating equipment and dedicated power supplies, vacuum drying and degreasing systems, refrigerant charging systems, vacuum purification and oil injection systems, and nitrogen mass spectrometer leak detectors. These products are widely used in industries such as refrigeration, automotive, packaging, power, energy, capacitors and batteries, foundry, nuclear, and defense.
The company was founded in 1993
Registered capital: 12.376 million yuan
Monthly production capacity of 20000 pieces
More than 150 employees
Products
Our company's current main products include refrigerant charging machines, explosion-proof charging machines, winding vacuum coating equipment, vacuum purification oil-injection machines, specialized power supplies, and nitrogen testing equipment. Refrigerant charging machines are used in industries such as air conditioning, refrigerators, water dispensers, and automotive air conditioning.
Specialized in the production of global helium leak detection equipment
Self-developed mass flow meter metering method filling machine
Oriental Instruments-Patent Certificate
Our company is also specialized in the face of military, nuclear energy and other special units have special needs of helium inspection equipment. Our company's helium leak detection equipment has also obtained the national invention certificate (certificate number: ZL 201510341572.0)
Oriental Instruments · News
The company's products have excellent performance and are well received by users. Its products have been distributed all over the country in the production enterprises of air conditioners, refrigerators, freezers, commercial air conditioners, central air conditioners and automobile air conditioners.
Company News
The main products of our company now include refrigerant filling machine, explosion-proof filling machine, vacuum purification filling machine, special power supply, helium inspection equipment, etc.
Industry Information
The company's products have excellent performance and are well received by users, and their products have been spread all over the country.
03
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18
News dynamics
Factors Affecting Comfort in Summer - Refrigerant Charging Machine
In summer, the use of air conditioning cooling is essential, so a good refrigerant charging machine is a key factor in determining summer comfort. Before adding refrigerant to the car air conditioning, first evacuate for 1 hour. When the system has no leaks and is under vacuum, open the R134a bottle with the nozzle facing down, loosen the soft hose connector in the middle of the pressure gauge to release the air in the hose, and open the high-pressure side manual valve to inject liquid refrigerant from the high-pressure side.
08
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17
News dynamics
How to correctly detect insufficient refrigerant
The weighing and charging method is the truly correct method, applicable to any refrigeration system. The method involves weighing the amount of refrigerant to be charged, and what needs to be done is to find out the amount or range of refrigerant to be charged from the relevant data. This is not just an observation method, but a real charging method. As long as the manufacturer specifies the correct charging amount on the nameplate for water-cooled cabinets or split units, weighing and charging can be done using a beam scale, electronic scale, dial scale, or other weighing devices after completely drying and evacuating the system. This charging method is the most suitable. For a system with some refrigerant, there are two methods to charge the refrigerant. 1. Release the already charged Freon, re-evacuate, and weigh for charging; Many maintenance personnel are reluctant to spend time recovering the refrigerant from a system that is undercharged before recharging. In this case, the following alternative method can be used. However, this is a comprehensive application of all the methods mentioned earlier or one or two of them. Note: Before using these methods, ensure that all coils are clean and that the airflow is correct. 2. Use the following method to continue adding refrigerant, measuring and recording all data. A. Charge while simultaneously checking superheat and subcooling. For air-cooled direct expansion systems, set the subcooling to 8~12°C and superheat to 7~8°C. B. Check the temperature difference between the inlet and outlet air of the coil. Ensure that the airflow of the condenser and evaporator is correct, as well as under moderate load conditions. C. Check and compare the suction/discharge pressures. Look for standard data provided by the manufacturer in the installation, operation, and maintenance manual. D. If there is a sight glass, check for bubbles in the sight glass. If there are bubbles, confirm whether they are due to excessive pressure loss or insufficient refrigerant. E. Check the compressor current. If the current is too low, analyze the reasons for the low current under several types of operating conditions of the system.
08
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13
News dynamics
Naming methods for refrigerants
Inorganic Compounds - The abbreviation for inorganic compounds is R7(). The parentheses represent a set of numbers, which is the integer part of the molecular weight of the inorganic substance.
Partner
Specialized in the production of global helium leak detection equipment; independent development of mass flow meter metering method filling machine, customers all over the domestic refrigeration enterprises, in the industry has a high reputation
Lichung Group
Xingyu Co., Ltd.
New Fly
Wanfeng
Wanbao Refrigerator
SK
Shengshida
Samsung
Now flying
Hualing Electric
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Chengdu Dongfang Instrument Co., Ltd.
Service Hotline:8602865518699
Sales Hotline:8613908209306 (Equipment)
8613908085776 (power supply and module)
Contact E-mail:cdoi@cdoi.com
Contact address: dongyi technology co., ltd., no 199, section 2, chongshuang freight avenue, chongzhou city, Chengdu city, Sichuan province, China
CopyRight©2025 Chengdu Dongfang Instrument Co., Ltd. All rights reserved
Hotline：8602865518699
After Sales(power supply and module)：8613908085776
After Sales(Equipment)：8613908209306
Email：cdoi@cdoi.com
Online message
The main products of our company now include refrigerant filling machine, explosion-proof filling machine, vacuum purification filling machine, special power supply, helium inspection equipment, etc.
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