Energy saving control of constant temperature and humidity chamberIn this paper, we make a detailed analysis of temperature and humidity chamber’s hot and cold offset problems, put forward an elimination of hot and cold offset design principles. On the use of multi-body variable refrigerant flow system, proposed a system partition approach, this air-conditioning chassis group is often running, naturally, energy consumption will be more.Therefore, to control the energy consumption of constant temperature and humidity chamber refrigeration system is the primary component of reducing the energy consumption. The energy-saving thinking and design of the temperature equipment refrigeration system is the most important problem that the engineering and technical personnel need to face. It is a requirement of the room temperature and humidity invariability. Sometimes the temperature deviation requirements within 1 degree Celsius, what’s more, also have higher humidity requirements.With the rapid development in mechanical processing technology, requiring the deviation scope of temperature and humidity smaller, that means higher demand for the refrigeration system of constant temperature and humidity test chamber, will greatly improve the energy consumption of the refrigeration system. In order to reduce energy consumption, it is necessary to carry out the energy-saving design of the refrigeration system and experiment with it. In addition, because the refrigeration system approach uses traditional units, the current efficient variable refrigerant flow centralized air conditioning system is rarely used. Then the equipment of the cold and heat source costs can also be reduced to complete energy conservation.
Ozone gas what harm to human body Ozone is mainly from the surface of the earth 20 km of the ozone layer, is the oxygen allotropy, mainly from human activities, automobiles, fuel and other important sources of pollution to produce ozone. If you inhale the ozone can cause respiratory infections, contact with the ozone will increase the existing respiratory diseases, and damage people's lung function, because the ozone is very strong corrosive. Ozone also on the human skin in the vitamin E until the destruction of the role, will lead to human skin wrinkling, dark spots, decreased vision, memory loss, but also damage the body's immune capacity, induced lymphocyte chromosomal lesions, accelerated aging, Copier toner heat generated by ozone is a strong carcinogen, it will cause all kinds of cancer and cardiovascular disease. From these aspects, the harm of ozone on the human body is very large, ozone aging test chamber is to simulate and strengthen the atmospheric ozone conditions, the role of ozone on the rubber and the law, rapid identification and evaluation of rubber anti-ozone aging performance And anti-ozone agent protective efficacy of the method, so as to take effective anti-aging measures to improve the service life of rubber products.
Types of Test Chamber Cooling SystemThere are two major types of chamber cooling systems, expendable refrigerants and mechanically cooled.Expendable RefrigerantsExpendable refrigerants are liquid/gases that can be injected directly into the space being cooled or into heatexchangers, similar to mechanical systems. As the liquid enters the chamber (directly or through a fin coil) itabsorbs heat and flashes to a gas. The gas is then vented out of the chamber and should be ducted outdoors.The two most popular refrigerants are liquid nitrogen (LN2) and liquid carbon dioxide (CO2). Cryogenictemperatures down to - 184˚C can be achieved with LN2. CO2 on the other hand can only achievetemperature down to -68˚C. Both of these gases are environmental safe andcan be vented to the atmosphere. Note: it is imperative that the gases be ventedoutdoors. These gases displace oxygen and asphyxia can occur if the chamber is notproperly vented.Mechanically cooledMechanically-cooled refrigeration systems are fundamentally the same as those usedin home refrigerators. They utilize a compressor and circulate a refrigerant around aclosed loop system. The ultimate low temperature required by your testingdetermines the type of refrigeration system needed.Single StageSingle-stage refrigeration systems typically can pull the temperature in the chamber down to - 34˚C.Some manufacturers rate their single stage systems down to -40˚C. However, due to the refrigerant usedthere is very little cooling capacity available at -40˚C and can be difficult to achieve. For continuous operation at-40˚C and below most manufacturers recommend a cascade refrigeration system.CascadeCascade refrigeration systems have two separate refrigeration systems working to cool the chamber down to anultimate low of -73˚C and -85˚C on industrial freezer models. The first stage refrigeration system coolsand condenses the refrigerant in the second stage. The second stage refrigerant flows through an evaporatorlocated in the chamber which cools the air. These systems can become very complex depending on yourapplication.
Tell The Manufacturer Your Test Specimen TypeIt is important to inform the chamber manufacturer of the type of product being test in the chamber. However, if all the details are not given to the chamber manufacturer, the resulting selection may not be best for your application and could cause safety risks. The chamber manufacturer should understand your test objectives as well as you do. The more information he has regarding your product and your test requirements, the better equipped he will be in either selecting a standard product to meet your needs or proposing a custom chamber designed to meet the special requirements of your product testing. For example, hydraulic valves under pressure are being test at various temperatures. Hydraulic lines enter and exit the chamber through an access port. Rarely, if ever, a fluid leak occurs in the chamber. This does not concern the operator since the warmest temperature achieved in the chamber is well below the auto-ignition point of the fluid. However, if a leak occurs the chamber will be at risk for an explosion. This is due to the fact that the standard nichrome wire heater used in most chambers can exceed 1000˚F surface temperature. For this type of application temperature limited sheath heaters must be used at a minimum. Depending on the application, a classified explosion proof chamber may be required. There are many scenarios which could be used for examples, but the bottom line is to make sure you have given your chamber manufacturer all the details of your tests.
Specification for maintenance of rain test chamberWe would like to introduce some Maintenances of Rain Test Box as follows:1. Please check the water tank has enough water before operation, If not, please fill it avoid damaging the dump.2. Please stopped it once you heard some noisy, and rebooted after the trouble is solved, in order to avoid influence the service life of the equipments.3. It should be kept dry when the equipment is in nonworking condition. Please drain away water of the chamber and drying the chamber.4. After the equipment runs for a long time, if the nozzle is blocked, the pipe must be removed, washed with tap water, and then assembled;5. Avoid external force impact equipment;6. Chemical exposure to this equipment shall be prohibited;7. Check the circuit control system before each start.8. Ventilation fans should be installed in the laboratory to maintain ventilation;9. Check the Power supply and ground Wire10. Whether the power wire is properly connected to the specification and is truly grounded11. The waste water discharge system of the equipment must be installed in place12. After the test, the power supply of the whole machine will be cut off;13. After test, the sample should be removed and the equipment should be cleaned.If you want to know more information (some guidance or user-manual), please feel free to contact with firstname.lastname@example.org.
How to Prevent Condensation in Test ChamberAir contracts as it cools. When a chamber is pulling down, it actually causes outside room air to be “sucked” into the chamber workspace. The moisture in the air will be drawn to and freeze on the cooling coil. The moisture will then vaporize into the air when the chamber is heated up and that moisture can end up as condensation on the test product. Dry Air Purge or Gaseous Nitrogen (GN2) may be used to minimize condensation. Purging the chamber with either of the two maintaining a slight positive pressure on the chamber and minimizes the moisture infiltration into the chamber. The dry air or GN2 contains very little moisture so the chamber air can stay “dry”. To help avoid condensation on the walls and product with humidity chambers, bring up the air temperature. first, let the walls and product stabilize, then raise humidity. If the chamber air temperature and humidity levels are raised faster than the wall and product temperature, moisture will condense on the cooler surfaces. By maintaining the dew point of the air below the surface temperature of the walls and product, moisture will not condense on the surfaces. In most cases you can run a characterization test or two first, to determine how long it takes the largest mass (be it product or wall) to stabilize.
Troubleshooting for Some Problems during ApplicationClimate explains some frequent questions of temperature and humidity chamber during application:. First, the constant temperature and humidity test chamber in the course of a sudden test failure, the control instrument appears on the corresponding fault display prompts and voice alarm tips. The operator can quickly check out which type of failure is in the chapter on the troubleshooting of the operation of the device. The operator can quickly troubleshoot to ensure that the test is performed normally. Other environmental testing equipment in use there will be other phenomena, it is necessary to specific phenomena, specific analysis and exclusion. Second, in the high temperature test, such as temperature changes can not reach the test temperature value, you can check the electrical system, one by one troubleshooting. Such as constant temperature and humidity chamber temperature is very slow, it is necessary to view the wind circulation system, look at the wind circulation adjustment baffle is open normally, on the contrary, check the wind cycle motor running is normal. Such as the temperature overshoot so you need to set the PID set parameters. If the temperature rises directly, then the controller fails to replace the control instrument. Third, the constant temperature and humidity test chamber in the hot and humid test, the actual humidity will reach 100% or the actual humidity and the target humidity difference is very large, the value is much lower, the former phenomenon: the wet bulb sensor may be caused by drying, It is necessary to check the wet bulb sensor water tank is water, the water level in the tank is controlled by a water level controller, check the water level controller water supply system is normal water supply, water level controller is working properly. Another may be the wet ball gauze due to the use of a long time, or water quality purity of the reasons, will make the gauze hard, so that gauze can not absorb moisture and dry, as long as the replacement or cleaning gauze can rule out the above phenomenon. The latter phenomenon is mainly the constant temperature and humidity chamber humidification system does not work, check the humidification system of water supply system, water supply system, whether there is a certain amount of water to control the humidifier boiler water level control is normal, humidification boiler water level is normal The If everything is normal, it is necessary to check the electrical control system, which requires professional maintenance personnel to repair. Fourth, constant temperature and humidity test chamber low temperature can not reach the test indicators, then you have to observe the temperature changes, it is clear that the temperature drop is very slow, or the temperature to a certain value after the temperature has rebounded. The former will check whether to do before the low temperature test studio drying, so that the studio to keep dry after the test sample into the studio to do the test, the studio test sample is placed too much, so that the studio The wind can not be fully circulated, in the exclusion of the above reasons, we must consider whether the refrigeration system failure, and this will ask the manufacturers of professionals to repair. The latter phenomenon is the use of constant temperature and humidity chamber equipment, such as the environment is not good, the device placed in the ambient temperature, place (the distance between the box and the wall) to meet the requirements (in the equipment operating instructions are provided ).
How to add Water to Saturated Tank A) Open the power control cabinet door, you can see the transparent water level indicator on the saturated tank, observe the actual position of the saturated barrel and the position of the highest water level (top of the water level indicator). B) Open the water adding valve of the saturated barrel (the water adding valve is open when it is perpendicular to the water pipe and is close when it is in parallel with the water pipe). C) Add purified water to the water adding inlet as shown in the figure (do not add the brine into it by mistake), and make sure to observe the water level sign. When the water level meets the requirement, stop adding water and close the water adding a hand-control valve. Attention: if there is not sufficient water in the saturator, please add proper amount of Purified water or distilled water into it. If in the fog spray state, please stop fog spray. When adding water, firstly open the charging valve of the saturated barrel, and add into it from the water supply inlet of the saturated barrel and close the charging valve after adding the water. The Water Checking of Saturated Barrel Check the water level of the saturated barrel. Open the chamber door of the power distribution cabinet on the right side of the equipment, the saturated barrel is located at the right lower corner of the equipment, and the transparent water pipe on the saturated barrel is the water level indicator. The water level reaching 80% of the full chamber of the saturated barrel is appropriate. When the water level falls to 40% of the full, it is necessary to replenish water in time to avoid causing the test to stop in the middle due to water shortage. When adding water to the saturated barrel, the water level should not be too high. When water level is too high, air may enter the saturated barrel to bring out a lot of water to the sprinkler head, causing the spray volume to increase, and the actual salt fog settlement is not accurate. When adding water, make sure to pay attention to the water supply inlet position to avoid adding water into the brine chamber and influencing the concentration of the test solution, thereby influencing the final test, or adding brine into the saturator by mistake.
Altitude Chambers - Altitude/Humidity/Temperature Test ChambersAltitude simulation testing is important for manufacturers of products that might be shipped via air. It is especially important for defense and aerospace applications where pressure and vacuum conditions are even more intense. CLIMATE INSTRUMENT altitude/temperature and altitude/temperature/humidity chambers offer performance flexibility and reliability for today's mixed-environment testing requirement. Our altitude test chambers control the temperature environment for testing your product while simulating various altitude environments from site level to 100,000 feet. The same chamber can be used to simulate temperature and humidity.If you are interested in CLIMATE Test Chamber, please feel free contact us :Our Email and Tel :email@example.com / 18680067830
Dust&Sand Test ChamberTemperature and humidity are not the only environmental conditions that products need to be tested to.Climatetester has developed advance designs to realize testing for additional conditions that products may be affected by.Dust testing is one of such designs. Dust Chamber Sounds simple enough, just build a cabinet that creates a continuous environment of dust. However, there are many details to consider. The floor of the chamber is an inverse pyramid. At the tip of the cone, an air nozzle lets in compressed air.The cone is filled with dust. A wire shelf above the floor holds the part under test.A window and rubber gloves thru the door allow the parts to be turned to ensure even exposure without opening the door.Special considerations were made to ensure that the dust is continuously dispersed and not accumulating on the floor.The compressed air is dried to keep the dust from clumping. And a special clamshell type door is used for easy loading.
Difference between Air-cooled and Water-cooled Methods of Thermal Shock ChambersClimate Thermal shock test chamber is mainly used for electrical and electronic components, automation components, communications components, auto parts, metal, chemical materials, plastics and other industries, defense industry, aerospace, military industry, BGA, Semi- conductor ceramic and polymer materials of physical change sacrificial, test the material of high and low temperature of the repeated resistance and the product of thermal expansion and contraction of the chemical changes or physical damage, you can confirm the quality of the product, from precision IC to heavy Mechanical components, will be used, is an essential test box in all areas of product testing.Thermal Shock Chambers include two boxes and three boxes types, and cold shock chamber cooling method includes two types: air-cooled, water-cooled, these two cooling methods have different differences:Water-cooled: the use of water mobility test chamber cooling work, which also is installed in the test chamber on the water tower, and the water tower can only be placed on the roof outside, cannot be placed indoor, to protect the water tower, make water pipe wrapped, cannot let it exposure or crack, so you can extend the life of the water tower.Air-cooled: The use of wind for natural cooling, this is more suitable for small power thermal shock chambers, if the test chamber ambient temperature is often kept at room temperature and equipped with ventilation device, the use of air cooling can be effectively extended Thermal shock chamber utilization and service life.The main purpose of these two cooling methods is for thermal shock test chamber cooling, by different ways, but the result is the same, mainly it depends on the test conditions how to choose and operate.
Why test drive systems and materials in extreme cold?Patrolmen in our areas are often much busier once the winter really kicks in and temperatures drop. Engines and other car components really suffer in low temperatures and sometimes end up breaking down. Although this is peanuts compared with what machinery and vehicles are faced with in extreme climates. How do people deal with this?In countries such as Finland, Sweden, Norway, Canada, China, Mongolia and Russia, where the temperatures regularly fall below 0°C, sometimes even to extreme levels of -40°C or -50°C, much more attention must be paid to such conditions and so the design of the machinery must always be optimised in order to continue operating. Therefore the drive systems and materials used on the machinery must be able to operate properly in such extreme conditions. It is therefore necessary to carry out tests at the same extreme conditions in order to determine the levels of reliability and robustness of the machinery in similar circumstances. Vehicles and other machines must be able to start up and remain running at extremely low temperatures. Continued operations in these extremes of temperature (from -30°C to even -60°C at some locations), can only be guaranteed if this is taken into account early on in the design stage and also at the end of the production development cycle. This is done by carrying out thorough validation tests. This is why sectors such as mining and quarrying and the off-highway industry always have their products tested under extreme conditions in climatic test chambers. The typical tests carried out on such machinery include the cold start tests, testing the heating and cooling systems in a variety of climatic conditions, testing the functioning of hydraulic systems in extreme cold, testing the functionality of the windscreen de-icing systems (ice testing) and making inspections for breaks and leakages in joints and seals that focuses on preventing leakages. Engines, drive systems, after-treatment systems and cold startingEngines and drive systems must generally be able to start up and do their work in all circumstances. The search for reduced fuel consumption has resulted in modern engines running more smoothly at higher compression ratios, with the combustion occurring at higher temperatures. This has resulted in relatively low CO and HC emissions, but higher emissions of NOx. In order to deal with the higher NOx emissions, so-called 'after-treatment systems' are deployed, although cold starting still remains a problem. These after-treatment systems are fitted as standard on off-highway and construction vehicles, and they are also used in the energy sector for making diesel generator sets more sustainable.Actual working situations have all too often demonstrated performance levels that differ from the anticipated performance. After-treatment systems are used to prevent high levels of NOx emissions. Various technological solutions are being tested (read more about this in this blogpost). NH3/urea SCR for example is a very effective and widely applied technology for reducing NOx levels in diesel engine exhaust fumes. The problem with NH3/urea mixtures is that it normally freezes around -11°C, therefore tests have to be carried out to find out whether such systems can continue operating in the winter without causing damage to the environment.In order to obtain the best results it is essential to test the complete vehicle or machine. Testing the complete set-up is the best way of collecting data about the general environmental suitability and operational sustainability of the machine so that potential problems of interference between the various subsystems can be detected. This makes it possible to evaluate the subsystems from the various manufacturers together and therefore identify installation faults or other difficulties before production begins. Engine builder MTU carried out tests on its engines at the extremely low temperature of -25°C for example. A climatic test chamber allows designers to carry out tests in controlled conditions into how easy, or difficult it is to start the engine at various temperatures. The test engineers altered the pressure, the volume and the timing of the fuel injection system in order to improve the starting characteristics. The test data is used for programming the engine management system and provide the engine with suitable start settings based on external ambient and coolant temperatures, while taking account of improvements to the lifespan and sustainability. Such tests are valuable for vehicles and machinery used in mining activities in places like Siberia and Canada where the temperatures can drop to Arctic levels of -60°C. Polar diesel is used there which has a kerosene content of 60 percent that makes it substantially less viscous than the standard winter diesel fuel. This is why the injector settings have to be altered in order to prevent the very thin fuel causing them damage. An air grill is fitted in front of the radiator to ensure that the engine is not over-cooled. The grill closes whenever the temperature drops too low. This means that the engine can always be started even with extremely low external temperatures. The engine management system automatically adjusts the volume of fuel and the injection timing in order to match the air temperature. Depending on the ambient temperature, a pilot injector located on top of the main injector can be activated during the starting routine.Sirris is also involved in this area and our facilities at the Port of Antwerp is one of the only technology centres in Europe to have a large climatic test chamber for testing such vehicles and machinery at Siberian temperatures. The climatic test chamber is unique in that it is possible to test machinery weighing up to 150 tons at -60°C. This is quite different from many other climatic test chambers for cars where the weight and temperature levels are not suitable for this niche market. Materials and cold work conditionsIt's not just fuels and hydraulic fluids that react differently at extremes of temperatures, because materials used for making engines and components are also affected. For example, bearings can suffer problems on starting up caused by differences between internal and external temperatures. The combination of cold, brittle materials and vibration can lead to even more problems. As well as metals, synthetic and rubber materials also behave differently. For example synthetic hoses for hydraulic circuits lose their flexibility at low temperatures by initially becoming leathery, then hard, stiff and brittle once the 'glass point' has been reached. The use of an elastomer for low temperatures depends on this point. At or below this temperature pressure, tension or impact on the synthetic material will damage or break it. Moreover, elastomers can degrade when exposed to thermal cycles. However, when the elastomers are treated with additives for resisting low temperatures, problems can arise when the temperature increases (the additives start to leach), so that the performance is reduced when the temperature is lowered once again. Large climatic test chamber for eliminating risks The availability of a large climatic test chamber with substantial dimensions, weight capacity and an extensive temperature range is essential for testing materials being used such as engines, drive systems and after-treatment systems on large vehicles or other machinery that is exposed to extreme conditions. In addition to the subsystems, the best results can only be obtained by testing the complete vehicle or machine. Therefore Sirris offers a specially adapted set-up and a unique testing infrastructure for companies involved in sectors including off-highway, construction and agricultural vehicles, wind energy applications, energy transmission systems, aerospace, defence, etc.The climatic test chamber is mainly used for testing very large and heavy wind turbine components including gearboxes, converters and transformers at extreme temperatures. The chamber was designed with a number of unique features, such as the large dimensions (10.6 m x 7 m x 8 m), extreme temperature range (-60°C to +60°C), 150 ton weight capacity and a facility for compensating 250 kW of heat at -20°C.Since last year the laboratory has been able to carry out air humidity tests with a range of ± 2% RH to ± 95%. Regarding the off-highway and construction vehicles market, the laboratory has also invested in the ability to test IR sunlight up to a density of 950 W/m², so that it can carry out tests on the cabs of large vehicles in accordance with ISO 14269-3 and ISO 10263-6 HVAC.
Technical methods for effectively extending the service life of ozone aging test chamberOzone aging test chamber is applied tothe aging cracking test of nonmetallic materials and rubber products.It is effectively prolong the service life of ozone aging test box and reduce the amount of maintenance will play an important role in improving the economic benefits of the test. Technical methods for effectively extending the service life of ozone aging test chamber as follows:1. Keep the ground around and around the chamber clean at all times.2. It shall remove the internal impurities before operation, and clean the lab room at least once a year . 3. It not be allow the test specimen come into contact with the door seal strip when opening the door or taking the test specimen from the chamber4. When the end of the test, do not take out the sample at once.It must be taken out of the shutdown state 5. The refrigeration system is the core of aging test chamber,check all the brass half a year, such as leakage of the situation, the functional joints, welding mouth, if the Leakage of grease, it must be dealt with immediately6. The condenser should be regularly maintained and kept clean.Dust sticky will make the compressor high-voltage switch trip and generate false alarm,So the condenser should be a monthly maintenance, you can use the vacuum cleaner, hard brush or high pressure air blowing dust to clean it,what attached to the condenser.7. At the end of each test,It is recommended to clean the test chamber with clean water to keep the equipment clean;After cleaning the box, the box should be dried to keep the box dry;8. Circuit breakers, over-temperature protection, and the operator's safety protection, please check regularly;
Four reasons resulting in the test result error of salt spray chamberSalt spray test chamber main for test the property of corrosion resistance of products’ surface, including electroplating, inorganic film, anti-rust oil and paint materials and other products. However, the device has the existence of test error. So many users also expressed doubts about the need for more accurate test data. Equipment in the course of the trial cannot ensure that 100% of the correct, in any case a little bit of data error. So what is the reason for it? According to the user feedback, have following reasons: First, the salt spray test chamber with their own errorOn account the design, manufacture and verification imperfection and the use of the test chamber in the process of its components aging, mechanical parts wear, fatigue and other phenomena formed by the error. Not only these parts will cause errors, but also various auxiliary equipment or accessories are likely to cause errors. Second, the error caused by the test methodThe method of operation should be carried out in accordance with the correct and standardized steps, and the test method should be reasonably improved. When the equipment test is based on the theory is not preciseness, unreasonable operation and the approximate formula or approximation of the calculation results and other factors will lead to test error. Third,the environment and the operator cause the errorDue to the actual environmental conditions differ from rated conditions caused error, the main factors are temperature, power supply voltage and electromagnetic interference. In addition, the operator's incorrect operation is one of the factors , the main reason is because the staff of the poor ability to distinguish, visual fatigue, detector speed is slow, bad habits and lack of responsibility and so on. Fourth, the error caused by the instability of the test sampleSalt spray test need a long time, if the test time to test the instability of the sample changes occur, that even if the performance of salt spray test chamber is no way to get the correct test data.