Environmental test chamber testing

Unlike the other requirements, which only referred to inspection, test, and measuring equipment, this clause adds test facilities. Facilities include the equipment and the area or room in which it is kept or used. Test facilities are any room, area, or complex in which tests are carried out. Inspection, measuring, and test facilities include functional and environmental test laboratories, test and inspection chambers, calibration rooms. 

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. 

Dix and Lavan conducted studies to measure the effectiveness of draperies and other indoor shading devices on the coefficient of thermal transmission, U, under winter and summer conditions (89)- With the aid of two environmentally controlled chambers and thermistors located near a test window, they determined that a medium-colored drapery with a white plastic backing reduced conductive heat loss in the winter by 6-1%, and conductive and radiant (solar) heat gains in the slimmer by 33%. Because shades inside casements were more effective than draperies in reducing heat loss under winter conditions, they concluded that the ability of the material to block air flow was more important than other properties of the material used (8 ). 

Environmental Growth Chambers (25) PST-19 Photostability Chamber, Figure 8, is designed to complete ICH QIB, Option 2 compliant pharmaceutical testing in as little as 20 hours. It has four shelves having a combination of UV-A and VIS bulbs and each shelf s bulb type is independently controlled. The air-flow to each shelf is independently controllable with dampers. 

Figure 8 (A) PST-19 photostability chamber and (B) their custom-built, walk-in, movable, test racks. Source-. Courtesy of Environmental Growth Chambers (EGC).

Air tightness of the environmental test chamber Internal air mixing Air velocity... 

Tichenor BA (1989) Indoor air sources using small environmental test chambers to characterize organic emissions from indoor materials and products. US EPA, report no EPA-600/8-89-074... 

Abstract Adsorption and desorption of indoor air pollutants to and from indoor surfaces are important phenomena. Often called sink effects, these processes can have a major impact on the concentration of pollutants in indoor environments and on the exposure of human occupants to indoor air pollutants, Basic theories are used to describe the processes using fundamental equations. These equations lead to models describing sink effects in indoor environments. Experimental studies have been performed to determine the important parameters of the sink models. Studies conducted in dynamic, flow-through environmental test chambers have quantified adsorption and desorption rates for many combinations of indoor air pollutants and interior surfaces. Sink effects have been incorporated into indoor air quality (lAQ) models to predict how adsorption and desorption processes affect... 

Studies conducted in dynamic, flow-through environmental test chambers have quantified adsorption and desorption rates for only a small number of the available combinations of indoor air pollutants and interior surfaces. 

The first environmental test chamber located in the L.F. Bornstein is Research and Development Laboratory was constructed in January,... 

Figure 1 is a top view sketch of our environmental test chamber. 

Board conditioning for large chamber testing, environmental test chamber, 163-165... 

The constmction of a gas manifold incorporating four mass flow controllers allowed the mixing of water saturated air with dry air to produce test streams of gas with accurate RH. Measured amounts of hydrogen were then added to the test stream. An environmental test chamber was also constructed from an insulated cooler. A heating element on the test chamber and a proportional temperature controller allowed control of the gas temperature and thus the thin film temperature to within 0. PC. 

---