烟密度测试仪

模型PTE003

烟密度室采用14号规格的铝箱，并铰接耐热玻璃玻璃门。这个盒子安装在底座上，底座上装有控制装置。根据测试材料的不同，金属可能需要防止腐蚀。除了底部四周25 × 30毫米(1 × 9英寸)的开口外，腔室是密封的。一个升/分钟指定容量的鼓风机安装在腔室的一侧。圆顶筒的进风管上装有紧密配合的阻尼器。圆顶帽的出口将通过管道连接到实验室排气系统。靠近门的两侧安装了70mm(2/3英寸)直径的防烟玻璃区域，进入底座上方480mm(19/4英寸)。在这些位置和腔室外面，附有装有光学设备和其他控制装置的盒子。一个可拆卸的白色塑料板被连接到房间的后面。 There is a clear area centered above the bottom of the chamber. Through which is seen an illuminated white on red exit sign. The white back ground permits observations of the flame, smoke, and burning characteristics of the materials. The viewing of the exit sign helps to correlate visibility and measured values. The specimen holder is supported on a square gage. Stainless steel wire cloth above the base and equidistant from all sides of the chamber. This screen is lying in a stainless steel bezel supported by a rod through the right side of the chamber. From the same rod similar bezel is located below and it is support a square of asbestos paper which catches any particles that may drip from the specimen during the test. By rotating the specimen holder rod, the burning specimen can be quenched in a shallow pan of water positioned below the specimen holder.

样品被丙烷火焰从一个在指定压力下运行的燃烧器点燃。燃料与空气混合，当丙烷从小孔通过时，丙烷的文丘里效应推动空气通过燃烧器。燃烧器的设计是为了提供充足的室外空气。燃烧器能够快速地放置在样品的下方，这样，燃烧器的出口就落在一条线上，这条线穿过腔室一角底座上方8mm的点，对角线穿过腔室，并与底座呈45度向上倾斜。有一个控制面板，控制和指示气体的供应。所安装光源的照度测量系统也安装在仪器中。仪器里装有一个数字计时器，用来指示时间。