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Information

AUTOPOL I Polarimeter

This is an entry-level system with a touch-sensitive keypad and a colour LCD display.  It has a resolution of 0.01 Deg Arc with an accuracy of +/- 0.02 Deg Arc. With the "AP" (Advanced Precision) option the resolution would be 0.001 Deg Arc and the accuracy would be +/- 0.004 Deg Arc.  The wavelength would be 589nm which is Sodium "D" line.

The AUTOPOL I is Rudolph's most economical automatic polarimeter designed for education and less demanding applications where the budget is critical, but quality is still important.


Quality

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).

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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 have greater 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.


Temperature

As shown in Figure B, the Autopol I comes with a Temperature Probe so that sample temperature can be displayed and printed. However, if your product requires Temperature Control, then the Autopol I 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.

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Optional Accessories

The Autopol I is a Single Wavelength Instrument operating at 589nm. The 589nm wavelength is often referred to as the Sodium D-Line. The Autopol I includes a 100mm or 200mm glass sample cell as well as a full range of optional accessories as shown in Figure C.

Specification

AUTOPOL I Specifications

Measuring Mode Optical Rotation
Specific Rotation
Concentration
°Z (ISS) Sugar Degrees
Measuring Scale Degrees Arc Optical Rotation
Measuring Range ± 89° Arc Optical Rotation
± 225°Z
Standard Model Specs Resolution: 0.01° Arc Optical Rotation
Reproducibility: 0.01° Arc Optical Rotation
Accuracy: ±0.02° Arc Optical Rotation, ±0.05°Z (ISS) Sugar Degrees
AP Accuracy Plus 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 589nms
Temp. Control Range Available on Autopol V only
A 0.01 resolution polarimeter cannot detect the effect of temperature changes between 20°C - 30°C 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
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 0.1% (up to OD 3)
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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