Test chambers temperature

The test chamber temperature is in this case fixed To- Following the standard (see GS 95 003) for the module, To = 80°C applies. This will result in ... 

Part of test Module state Simulation time m Test chamber temperature [°C] Time interval between hinctional checks Ih]... 

When calculating simulation times the test chamber temperature will be kept during the test at the values specified according to the recommendations of the standards (see GS 95 003) (Lipson Sheth 1973 Kapur Lamberson 1977). During the operating time simulation the temperature inside the chamber will be kept at the value Tp = 80 = C, and during the dormant... 

Because the applied tensile stress o is directly proportional to the given weight L acting on cantilever arm (o = L/[cross-functional area]), Eq. (13.5) can expressed in terms of test chamber temperature T and load L ... 

To prevent unrealistically short creep rupture times, one needs to maintain stress loads below about 60-70% of the measured tensile strength at the same test chamber temperature. This is an important criterion for selecting appropriate weights for accelerated tensile strength determination. 

A small 3 cm x 3.5 cm section of the catalyst-coated desiccant wheel (25 cm diameter) was cut and placed in specially made holder shown in Fig. 12.9-6a. The piece of sample was tested in a 0.2 m3 environmental chamber at Chiaphua Industries Ltd. (Fig. 12.9-6b) for reduction of airborne VOC. The chamber was filled with the target VOCs through two stage saturators shown in Fig. 32b. Once the VOC level in the chamber stabilized, the fan was turned on to circulate the air through the sample. Three sets of sensors were located at the inlet and outlet of the holder, as well as in the center of the chamber. The chamber temperature and relative humidity were kept constant during the test. Figure 12.9-6c shows the results for VOC levels of 4000, 2000 and 1000 ppb at room temperature. The reduction rate was slower because of the low VOC concentration and the poor air circulation in the chamber. Also unlike the Prototype Unit, the catalyst was kept at room temperature throughout the test. 

Olfactometric measurement should be undertaken in a room or area which is kept free from odors. There should be an atmosphere of comfort and relaxation in the test chamber, which will encourage panel members to concentrate on the testing task and not to be distracted by external stimuli. The test should be carried out at room temperature and normal humidity. 

DEF-1053 Method No. 26. Alternative running of carbon arcs in 6-hour periods, with a chamber temperature of about 405C. In between carbon arc operational periods, deionized water spraying with a resistivity over 300.000JX.cm. Testing period ... 

Tensile Modulus. Tensile samples were cut from the 0.125 in. plates of the compositions according to Standard ASTM D638-68, into the dogbone shape. Samples were tested on an Instron table model TM-S 1130 with environmental chamber. Samples were tested at temperatures of -30°C, 0°C. 22°C, 50°C, 80°C, 100°C and 130°C. Samples were held at test temperature for 20 minutes, clamped into the Instron grips and tested at a strain rate of 0.02 in./min. until failure. The elastic modulus was determined by ASTM D638-68. Second order polynomial equations were fitted to the data to obtain the elastic modulus as a function of temperature for each of the compositions. 

The FJ test is similar to an aerodynamic wind-turmel test used for supersonic aircraft, except for the airflow condition. A ducted rocket projectile is mounted on a thrust stand and the projectile and thmst stand are placed in a test chamber. A supersonic airflow simulating the flight conditions is suppHed to the projectile through a supersonic nozzle attached to the front-end of the test chamber. The pressure and temperature in the test chamber are kept equivalent to the flight alHtude conditions. The aerodynamic drag on the projectile and the thmst generated by the ducted rocket are measured directly by the FJ test. The airflow surrounding the projectile and the combustion gas expelled from the ramburner flow out from the exhaust pipe attached to the rear-end of the test chamber. 

Figure 15.10 shows the temperature dependence of the concentrations of two VOCs emitted by carpets, styrene and benzothiazole, into a test chamber (Sol-... 

Vacuum-Steam-Pressure Test. A special aging test which has been used successfully in the USA to accelerate aging to produce the effects of 6-month tropical exposure on certain types of sealed fuzes. It is primarily a development test which can be used during production The test consists of subjecting bare fuzes to 1000 fifteen-minute consecutive cycles in a vacuum-steam-pressure environment. The 1000 cycles takes about 10 days of continuous running time. The basic cycle consists of temperature-humidity cycling superimposed on pressure cycling in a test chamber with a salt laden atmosphere. Representative curves of temperature and pressure are shown in Fig 1... 

A Tenney environmental test chamber (Model TSU-100) was used as an air bath. Temperature can be controlled to 0.1 °C. by adapting an Aminco bimetallic thermoregulator connected to a supersensitive relay. Samples were prepared in the form of rectangular strips. First, moduli were measured as a function of temperature. At least five minutes was given to each temperature increment ( 5°C.) to obtain thermal equilibrium. 

Conventional materials emissions test methods are usually carried out using small test chambers or cells with samples prepared and presented to the air flow within the chamber/cell as they would be to room air in real use. Operating parameters (temperature, humidity, etc.) are selected to simulate the indoor environment and are summarized in Table 6.2. 

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