Your browser is no longer supported.
Unfortunately, Internet Explorer is not compatible with this website.

Please update to a more modern browser, such as:

microsoft edge

Microsoft Edge

google chrome

Google Chrome





Product Enquiry Cart

Product/s I am interested in

You currently have no products in your enquiry cart, please continue browsing and select more products.

Get a Quote

Continue Browsing

Auto Density Measurement System

Using the Gradient Column Method, the Ray-Ran Density Gradient Apparatus can calulate the density of a specimen to 6 decimal places.




The Advanced Auto Density Gradient Apparatus from Ray-Ran has become the world’s benchmark for accurate density measurement of small solid specimens using the column method. Built with operator simplicity in mind, its ease of operation and high accuracy makes it ideal for product development and quality control within production, research and development labs and teaching institutions.

Offered as a 3 or 6 column version, the built-in on-board Microprocessor System accurately calculates the specimen’s density to a resolution of 0.001g/ml more quickly and more accurately by measuring the samples position in the column relative to the calibrated marker floats. Once the correct position of the sample is recorded the density is displayed on the LCD screen. Column linearity can also be checked and shown in Techni-test software.

The on-board LCD provides simple on-screen instruction and using the alpha/numeric keypad test parameters such as operator list, material reference numbers and batch numbers can be entered and stored for results presentation. Batch statistics of mean, standard deviation and co-efficient of variation are automatically updated after each test and results are shown in graphical and tabular format for analysis when downloaded to the supplied Techni-Test PC software.

For results accuracy the Density Gradient Apparatus is supplied with built in digital temperature control to ensure the temperature of each column is at 23°C+/- 0.1°C. For ambient temperatures in excess of 23°C the integrated cooling coil can be used in conjunction with an optional water chiller unit so the correct temperature can be maintained. This can be even more accurately controlled using the optional microprocessor-controlled water flow valve kit.

To build a column a peristaltic pumped filling system is supplied with the apparatus. Column filling speeds are variable from 0.5l/hr to 1.5l/hr. The resulting solution has a density which when introduced into the column increases uniformly from top to bottom. Calibrated glass marker floats with known densities are introduced into the column and sink to a point where their density matches the solution. A linear encoder which is attached to a trammel guide is used to calibrate the gradient of the column by focusing the optical microscope onto the centre of the calibrated float and entering the floats density value into the microprocessor. Once test samples have been introduced into the column and have reached a point of static equilibrium, they are accurately sighted using the microscope. The resultant density of the sample is obtained and displayed on the LCD without the need for complicated graphs. An automatic sweep mechanism is used to extract the floats and samples from each column.

Optional Ancillaries:
Glass marker floats 0.7g/ml up to 2.2g/ml
Microprocessor controlled filling system
Digitally controlled water chiller
Basic manual water chiller unit

Weight (3 column):  70 kg

Weight (6 column):  80 kg

Dimensions (3 column):  850x400x1110 mm (WxDxH)

Dimesnions (6 column):  1200x400x1110 mm (WxDxH)

Power:  110-240VAC, 50-60hz

Display:  160 x 128 dots graphic LCD module with alphanumeric keypad

Features & Benefits

Techni-Test Software for data anaylsis

Automatic density calculation

Automatic calibration system

LCD display


Variable speed pumped filling system

Twin conical filling flasks

Automatic magnetic stirrer

Automatic sweep mechanism

Stainless steel sweep baskets

7x optical microscope

Digital temperature control to 0.1°C

Mini USB

Cooling coil

110v 60hz and 240v 50Hz

Product user manual

Traceable calibration certificate

CE declaration certificate

1 year return to base warranty