AUTOPOL II Polarimeter

This is a system which is one step advanced to Autopol I.  Instead of single wavelength, this system would have two - 546 & 589nm.  Apart from that, all the other feature such as accuracy, resolution, repeatability etc. Would be just the same.  With the "AP" (Advanced Precision) option the resolution would be 0.001 Deg Arc and the accuracy would be +/- 0.004 Deg Arc.

The AUTOPOL II is designed as a general purpose automatic polarimeter for budget focused Contract Laboratories, Food Laboratories and College Chemistry Laboratories.


Rudolph manufactures its entry-level polarimeter with the same high quality optics as its more expensive instruments. While other manufacturers in this price range use Polaroid Plastic Dichroic Sheet Polarizers, Rudolph does not. Instead, Rudolph uses the same high quality Glan Thompson Calcite Polarizers used in its high accuracy models (Figure A).


Why are high quality polarizing prisms important? Because prisms are two of the most critical optical components in the polarimeter. Polaroid prisms are made of a polymeric plastic where the molecules are stretched and oriented in a specific direction so as to linearly polarize light. These types of plastic sheet polarizers are very inexpensive ($50.00 USD) and are vulnerable to heat, warp over time, deteriorate from moisture, and also havegreater light absorption than Calcite Polarizers. In many cases, the plastic polarizers must be replaced in 3 - 5 years. Glan Thompson Calcite Polarizers are comprised of a carbon crystalline structure similar to diamond and have excellent light transmission characteristics. The quality of these prisms is so good, Rudolph guarantees its prisms over the life of the polarimeter.


As shown in Figure B, the Autopol II comes with a Temperature Probe so that sample temperature can be displayed and printed. However, if your product requires Temperature Control, then the Autopol II will most likely not be accurate enough for this type of sample, as is the case for 98% of pharmaceutical applications where a Certificate of Analysis must be issued.


Wavelengths and Accessories

The Autopol II comes with two built-in wavelengths that are selectable via the touch screen: 589nm (often referred to as the Sodium D-Line) and 546nm. The Autopol II also includes the Standard Accessories Package shown in Figure C or you can upgrade to the Calibration Package shown in Figure D.




Measuring Mode Optical Rotation
Specific Rotation
°Z (ISS) Sugar Degrees
Measuring Scale Degrees Arc Optical Rotation
Measuring Range ± 89° Arc Optical Rotation
Standard Model Specs Resolution: 0.01° Arc Optical Rotation
Reproducibility: 0.01° Arc Optical Rotation
Accuracy: ±0.01° Arc Optical Rotation, ±0.03°Z (ISS) Sugar Degrees
AP Model Specs Resolution: 0.001° Arc Optical Rotation
Reproducibility: 0.002° Arc Optical Rotation
Accuracy: ±0.004° Arc Optical Rotation
Prism Glan Thompson Calcite
Optical Wavelengths 589nm
Temp. Control Range Available on Autopol V only
A 0.01 resolution polarimeter cannot detect the effect of temperature changes between 20ƒC - 30ƒC for most substances.
Temp. Control Accuracy Available on Autopol V only
Temp. Probe Measurement Range 10° - 40°C
Temp. Probe Measurement Accuracy ±0.1°C
Measurement Time 5 measurements in less than 25 seconds (avg.)
Light Source Tungsten-halogen 6V, 20W, avg. 2,000 hour life
Sample Chamber Accepts sample tubes up to 200mm
Data Storage Available on Autopol V only
Communication Interface Two RS232 serial ports, one parallel printer port
Analog Output 0.1% resolution 0-10 volt full range (optional)
Calibration Automatic calibration via touch screen
Display 7.5cm x 10cm Graphics LCD, 320 x 240 dots cold fluorescent back lit
User Interface Touchscreen
Automatic Sensitivity Control Measures samples with transmittance as low as 0.01% (up to OD 0.04)
Input Power 100 - 240V, 50/60Hz
Operation Dimensions 24.3"W x 12.7"H x 17.5"D,
617mm W x 323mm H x 445mm D
Shipping Dimensions 36"W x 19"H x 21"D,
923mm W x 487mm H x 538mm D
Operating Weight 42 lbs. (19.05 kg)
Shipping Weight 72 lbs. (32.6 kg)
Calendar/Clock Functions Battery-backed clock; time and date sent to computer and printer
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