Saccharimeters

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• AUTOPOL 880
• AUTOPOL 589
• Sample Cells
• Calibration Standards
• Polarimetry Definitions

	The AUTOPOL 880 Series Automatic Saccharimeter is a dual wavelength microprocessor based saccharimeter capable of measuring at both 589 nm and 880 nm. The 880 nm ICUMSA Approved near infrared wavelength allows measurement of dark sugar factory juices, while the AUTOPOL Automatic Saccharimeter Purity Mode allows simultaneous measurement and display of PURITY, BRIX and POL.
AUTOPOL 880

	The AUTOPOL 589 Series Automatic Saccharimeters provides the same features, measuring speed and accuracy of the AUTOPOL 880 but at the single wavelength of 589 nm.
AUTOPOL 589

Why Choose Rudolph Saccharimeters?

Rudolph Research Analytical knows Sugar Technologists around the world demand 24 hour operation, 7 days a week for up to 9 months out of the year. They expect 0.02°Z reproducibility and accuracy. Rudolph Research understands these demands and requirements, because Rudolph has been serving the sugar industry since 1940. Throughout those sixty plus years, Rudolph has dedicated itself to manufacturing quality instrumentation and providing superior technical and service support, both directly and through its worldwide dealer network. This dedication is consistent with Rudolph's over 2,000 instruments installed worldwide, with many of those instruments still in operation after 25 years of service.

Just listen to our customers:

The AUTOPOL 589 and AUTOPOL 880 provide 0.02 repeatability and accuracy, time proven measurement technology and the critical features necessary for today's sugar analysis.

Dual Wavelengths

The most important feature of the AUTOPOL 880 is its ability to measure at two wavelengths: 589 nm and 880 nm (NIR). Select 589 nm for conventional analysis using chemical or lead clarifiers, or select 880 nm for polarimetric sugar measurements in the near infrared NIR). 880 nm is above the absorption level of most dark sugar factory solutions allowing measurement of filtered but non chemically clarified juices. Using Whatman 91 filter paper, Manville Filter Cel Grade Celite, a 100 mm cell and the proper technique, sugar solutions from crushed cane to molasses and raffinate can be measured. Please refer to our application note 910A.

Dilution and Cell Length Correction

Whether your sugar analysis requires a 100 mm or 200 mm cell, whether you use 1/2 normal (13g/100ml), 1/4 normal (6.5g/100ml) or full weight sugar solutions, the AUTOPOL 589 and 880 provide the correct multiplier to display the reading as if the sample were prepared as a 1 normal solution in a 200 mm optical pathlength cell.

Automatic Temperature Correction

The AUTOPOL 589 and 880 have a built-in temperature probe to measure the temperature of the sample or quartz control plate being measured. The AUTOPOL 589 and 880 display the temperature source and type of correction. Utilizing factory programmed temperature coefficients the AUTOPOL saccharimeters can make the following types of temperature corrections:

(1) A 30°C sucrose sample can be measured and corrected to 20°C or 27.5°C.

(2) A Quartz Plate measured at 25°C by the built-in temperature probe can be automatically corrected to 20°C.

Automatic Calibration

Calibrating the AUTOPOL 589 and AUTOPOL 880 is quick and simple. First, place a Rudolph Quartz Control Plate calibration standard on the optical rails and enter the Quartz Plate value in the appropriate window. Second, enter the temperature or use the temperature provided by the built-in temperature probe to correct the measurement to either the ICUMSA standard temperature of 20°C or the Tropical reference temperature of 27.5°C. Third, press 2 buttons and calibration is complete.

Purity Mode

Add a Rudolph J Series Refractometer to the AUTOPOL 880 or AUTOPOL 589 and read BRIX, POL and PURITY simultaneously on the AUTOPOL Automatic Saccharimeters 4x5 inch LCD backlit display.

Weight/Volume (Purity Mode)

Purity Mode allows the automatic determination of purity using any weight volume combination possible. The Saccharimeter can have one type of dilution and the Refractometer another, either way, the AUTOPOL 589 and AUTOPOL 880 and will still provide the correct Purity Value based on a 1 normal solution.

Weight/Weight (Purity Mode)

For sugar manufacturers who prefer to work on a weight/weight (wt/wt) basis or a combination of wt/wt and wt/vol., the Purity Mode's advanced software will still provide an accurate Purity determination based on a standard normal solution.

Sample Specific Programs

The AUTOPOL 589 and 880 offer sample specific programs which can be pre-defined for specific juices. This capability is advantageous in factory environments where the same type of samples are repeatedly measured. These programs allow for input parameters such as: multiplier, wavelength, temperature correction to be prespecified. Enter into PURITY MODE and add a Refractometer and then dilution on a weight/weight or weight/volume basis can also be prespecified for each sample name. Each program can be labeled with an alphanumeric and assigned to one of the function keys. The factory operator simply presses the preassigned function key to start measurement.

I/O Configuration

The AUTOPOL 880 has one centronix parallel port and two serial ports. These ports are configurable in the "I/O Configuration" option of the Setup Menu, allowing simultaneous communication to a Refractometer, printer and a remote PC or central database.

Print & Data Transmission Format

The printout below is an example of what can be generated by the AUTOPOL 880 Purity Option Software. This type of printout can be sent to a PC or a printer. The Purity, Saccharimeter and Refractometer measurements can all be accessed and retrieved by a remote PC either by specific key commands or on a time interval basis. Similar printouts can be generated by the AUTOPOL 880 however, these printouts are limited to the following parameters: sample name, tube length multiplier, °Z value, date-time, wavelength, temperature correction, range limits and statistical functions.

Definitions

The AUTOPOL 880 always displays Purity as if it were reading a 1 normal solution as defined in SPS-1: 3.1 The "normal sugar solution" is defined as 26.0160 g of pure sucrose weighed in vacuo and dissolved in water at 20.00°C to a final volume to 100.000 cm3. This corresponds to 26.000 g weighed in air under normal conditions (1013 mbar, 20°C, 50% relative humidity) and dissolved in water to a final volume of 100.000 cm3 . Therefore, Rudolph displays:

%Sucrose
%Sucrose = °Z reading corrected for dilution Example: a 1/4 normal wt. solution reading 13.70°Z will read (4 x 13.70°Z) 54.80 %Sucrose.

%RDS-OP
%RDS-OP = Refractometer dissolved solids or Brix prior to dilution Example: a 3:1 dilution having a refractometer Brix reading of 14.30 would read 42.90 %RDS-OP (14.30 Brix x 3).

%PURITY
%PURITY = (%Sucrose / %RDS-OP) x 100 x apparent density polynomial

ICUMSA Specification and Standard SPS- 1 (1998) Polarimetry and the International Sugar Scale - Official

Excerpts from SPS-1 (1998) shown below describe Rudolph's basis for calibrating quartz and its Saccharimeters at 589 nm and 880 nm.

7.6 Use of quartz control plates in polarimeters with different wavelengths. As outlined in Section 7.5, a quartz control plate has a sugar value of 100°Z for a particular wavelength, if its rotation is equal to that of the normal sucrose solution at the same wavelength. The numerical values for the wavelengths used in practice are given in 5.4. They are calculated from the value at the basic wavelength of 546.2271 nm using equation (3) for the rotatory dispersion of sucrose solutions. In addition the rotation values of a quartz plate must be known for those wavelengths which are needed for its calibration. Using experimental data by Bunnagel and Oehring and the 22nd Session study 55 the specific rotatory dispersion of a quartz for a wavelength in the range 546 - 900 nm is given by e quation (4). In determining the appropriate quartz plate value for a polarimeter operated at a near infrared wavelength, the wavelength of the particular light source employed needs to be known.

Rudolph calibrates its Quartz at 880 using the above ICUMSA approved method and others upon request.