儀器描述： 密度梯度柱的方法可以精確的測量任何形狀的小而硬的樣品的密度，例如：薄片，薄膜，小顆粒，粉末等等。玻璃測試管內(nèi)充滿了二種易混合的溶液。 產(chǎn)生的混合液在試管頂部具有較低的密度，而在試管的底部具有較高的密度，并以線性的比率變化。被精確校正過的已知密度的玻璃浮子標(biāo)記物放入這個梯度柱中，這個玻璃浮子正好懸浮在與溶液密度相匹配的點處。裝置使用一個線性的編碼器來校準(zhǔn)柱子的密度梯度。 通過采用一個光學(xué)顯微鏡頭將光線聚焦在已校正過的浮子的中心上，然后收集這個浮子的密度值，將信息輸入到微處理器內(nèi)來完成。一個未知密度的樣品放入到梯度柱中，等待其達到平衡。線性編碼器測量樣品在梯度管中的相對于標(biāo)準(zhǔn)浮子的位置，然后在液晶顯示器“LCD”上顯示出它的密度。
應(yīng)用： 1. 高分子量材料的密度測量
2. 纖維的密度測量（天然的和人造的）
3. 樹脂產(chǎn)品的密度測量
4. 質(zhì)量控制產(chǎn)品的密度測量
特點：
1. 自動配液、自動顯示密度值，方便、可靠。
2. 讀數(shù)精度為0.0001克/毫升，密度柱范圍在0.05克/毫升之內(nèi)
3. 自動恒速打撈器，增加密度柱使用壽命
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