仪器描述： 密度梯度柱的方法可以精确的测量任何形状的小而硬的样品的密度，例如：薄片，薄膜，小颗粒，粉末等等。玻璃测试管内充满了二种易混合的溶液。 产生的混合液在试管顶部具有较低的密度，而在试管的底部具有较高的密度，并以线性的比率变化。被精确校正过的已知密度的玻璃浮子标记物放入这个梯度柱中，这个玻璃浮子正好悬浮在与溶液密度相匹配的点处。装置使用一个线性的编码器来校准柱子的密度梯度。 通过采用一个光学显微镜头将光线聚焦在已校正过的浮子的中心上，然后收集这个浮子的密度值，将信息输入到微处理器内来完成。一个未知密度的样品放入到梯度柱中，等待其达到平衡。线性编码器测量样品在梯度管中的相对于标准浮子的位置，然后在液晶显示器“LCD”上显示出它的密度。
应用： 1. 高分子量材料的密度测量
2. 纤维的密度测量（天然的和人造的）
3. 树脂产品的密度测量
4. 质量控制产品的密度测量
特点：
1. 自动配液、自动显示密度值，方便、可靠。
2. 读数精度为0.0001克/毫升，密度柱范围在0.05克/毫升之内
3. 自动恒速打捞器，增加密度柱使用寿命
4. 符合ISO1183,ASTM D1505-68
Product Description
Digital Readout Density Column. – The gradient column method accurately measures the density of small solid materials, in various forms, Pellets, Granules, film etc..and conforms to the ASTM D1505 & ISO 1183 Method D standards.
The density is formed by mixing two fluids having different densities. The resulting solution has a density which when introduced into the column increases uniformly from top to bottom.
Ray-Ran’s new advancement means that density measurements can be made more quickly and more accurately.
The height of the calibrated marker floats or samples introduced into the density gradient are measured using a trammel guided “sight” connected to a positional encoder relaying the height position to a microprocessor so that the density can be obtained without the need for graphs etc.
This also means that the Gradient can be calibrated & checked at any time.
Standard features include.
Microprocessor System to accurately calculate the Density of the Sample. Twin conical flask pumped filling apparatus with motorised magnetic stirrer, Automatic column clearing device – sweep basket arrested automatically at top and bottom of column and pivoted for use over any of the 3 columns, Digital Temperature Controller accurate to +/- 0.1 �C, RS232 output, Built-in cooling coil, black or white twin background to assist sighting different colour samples, Microprocessor Auto Calibration System, Fully traceable certificate of calibration, Product user manual, CE mark of conformity
Optional accessories available.
Microprocessor Controlled Filling System, Water chiller unit, glass marker floats, Thermal printer
Test Description
When a sample material is placed in the density column its height in the column is measured using the trammel system “sight” and the microprocessor then calculates the corresponding density.
Part Numbers
RR/DGA .– Auto Density Measurement System .- RR/DGA/CFS. – Computerised Filling System – RR/DGA/CU. – Water Chiller Unit – DGA/FLOAT/001. – Glass Marker Floats (density from 0.8 g/ml to 1.599 g/ml)DGA/FLOAT/002. – Glass Marker Floats (density from 1.600 g/ml to 2.200 g/ml)DGA/FLOAT/003. – Glass Marker Floats (density from 0.7 g/ml to 0.799 g/ml)
Complies with Standard(s)
ISO 1183, ASTM D1505