I. Word of caution
1. Before using the equipment, you must read this manual and operation rules in detail
Follow the procedure and follow the steps.
2. The outlet flow regulation value of carbon dioxide cylinder must be controlled according to the requirements of the manual. After each cylinder replacement, all interfaces need to be tested for leakage, which can limit gas leakage!!!
3. The carbonization test chamber must be managed and operated by professional test personnel. Non-related personnel should not change the Settings in the control system without authorization. If necessary, please operate it by professionals.
4. There must be no dew in the test chamber!!! After each test, clean the debris and water in the box, open the lid to dry (to protect and prolong the life of temperature and humidity sensors and CARBON dioxide analyzer)!
5. External power cord: red is the live wire, blue is the neutral wire, and green is the ground wire.
If there is any problem or abnormal situation with the equipment, please shut down immediately and contact us. Our technical staff will contact your company to solve related problems as soon as possible.
II. Overview
The carbonation test chamber is a specialized device designed for concrete carbonation tests. This product complies with the requirements of the following standards: GB/T50082-2009 'Long-term Performance and Durability Test Methods for Ordinary Concrete', JG/T247-2009 'Carbonation Test Chamber for Concrete', T0581-2020 'Carbonation Test Method for Cement Concrete', DL/T5150-2001 'Test Regulations for Hydraulic Concrete', and JTG3420-2020 'Test Regulations for Cement and Cement Concrete in Highway Engineering'. The chamber features an imported CO2 analyzer based on infrared detection technology, integrated with advanced domestic intelligent control systems, ensuring high precision and longevity. The temperature and humidity sensors are composed of advanced integrated sensing modules and intelligent control systems, offering high control accuracy, ease of operation, and direct digital display of temperature, humidity, and concentration inside the chamber.
III. Main structure and working principle
The carbonization test chamber is a sealed enclosure where the test specimen is placed on the partition inside. The temperature, relative humidity, and carbon dioxide concentration required for the test are set using the touch screen control system of the carbonization chamber. The system compares the actual data inside the chamber with the set parameters and adjusts the relevant controls to maintain constant temperature, humidity, and carbon dioxide levels.
The carbonization test chamber is primarily composed of the cabinet, power supply, control system, and drive system. The outer shell of the cabinet is made from cold-rolled steel plates, while the inner liner is crafted from high-quality stainless steel sheets. The partitions are constructed from stainless steel profiles, and the space between the inner liner and the cabinet is filled with polyurethane foam, ensuring excellent thermal insulation, fire resistance, moisture retention, sealing, and corrosion resistance.
IV. Temperature, humidity and CO2 concentration control system
Temperature, humidity and CO2 concentration control system is composed of heating system, refrigeration system, dehumidification system, humidification system, gas addition system, temperature and humidity sensor, CO2 analyzer, control system and drive system.
When the temperature measured by the sensor in the box is lower than the lower limit of the set value, the control system issues a command to drive the system to start the heating system. Conversely, when the temperature is higher than the upper limit of the set value, the control system issues a command to drive the system to contact and absorb the refrigeration system to work; when the temperature in the box reaches the temperature control value, contact
The release of the machine, heating system or refrigeration system stops working, so as to achieve the purpose of constant temperature in the box.
The dehumidification process uses the condensation and absorption method. When the humidity inside the chamber exceeds the upper limit of the set value, the humidity control system sends a signal to activate the dehumidification system. Once the humidity returns to within the upper control limit, the system automatically stops. Conversely, when the humidity.
drops below the lower limit of the set value, the control system sends a signal to activate the humidification system. The humidifier then sprays water to increase the humidity. When the humidity reaches within the lower control limit, the system automatically stops, ensuring a constant temperature inside the chamber.
The carbon dioxide concentration control system uses the principle of infrared ray to measure the relative power signal of the carbon dioxide gas concentration in the box, and makes a judgment through the concentration control analyzer. The output control signal is sent to the control action to make the pneumatic element work, so as to control the opening and closing of the carbon dioxide gas supply system.
V. Installation and debugging
1. Installation
The box shall be placed in a ventilated, dry, flat and corrosion-free environment
When using the carbonation test chamber, ensure it is placed horizontally and securely. The power supply for the chamber should be 220V (AC), and it is recommended to use a voltage stabilizer and a dedicated power supply. After placing the chamber, connect the carbon dioxide cylinder to the chamber using high-pressure pipes and a carbon dioxide pressure reducer, with the connection point on the left side of the chamber (the connector is plug-in type; insert it firmly). Add distilled water or purified water to the humidifier to ensure the sensor's lifespan.
2. Debugging
First, after the gas pipeline is connected, the industrial CO2 cylinder pipe enters from the left side of the box
First, check all connections to ensure there are no leaks. Second, turn on the power switch. The display will show the operating procedures, and after clicking [Enter Control Center], you will enter the main interface. The display will show the actual temperature, humidity, and carbon dioxide concentration inside the box. Set these parameters according to the requirements of the experiment. Click [Switch] on the main interface to start the system, which will adjust the temperature inside the test chamber to the set value. Third, open the CO2 gas cylinder and adjust the pressure reduction valve to achieve an outlet flow rate of 10L-15L/min. Turn on the humidifier to the appropriate level. The control system will automatically monitor the temperature, humidity, and carbon dioxide concentration inside the box and issue commands to activate the components, maintaining a constant temperature, humidity, and carbon dioxide concentration. During the experiment, no dedicated personnel are required to monitor the system; instead, check periodically if the CO2 gas in the cylinder is used up and needs replacement, and if the water supply for the humidifier is sufficient and stable.
VI. Troubleshooting
1. No display or non-working display when starting up: the power supply is not connected, whether the plug and socket are in good contact, whether the wiring and power switch are in good condition, whether the working lamp is on, and whether the input and output lines of the control system and drive system are detached or in poor contact.
2. No cooling, no heating, no humidification, no dehumidification. Whether the upper and lower limit setting value of temperature and humidity in the control system is correct, whether the corresponding indicator light is on, and whether the corresponding AC contactor works.
3. The carbon dioxide system is not filled with gas, whether the carbon dioxide concentration in the control system is set correctly, whether the cylinder switch is open, whether the indicator light is on, and whether the solenoid valve is working.
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