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.
Automatic Polarimeter – AUTOPOL I
Autopol I Polarimeter Standard Features:
- 0.01° Arc Accuracy.
- 589nm fixed wavelength.
- Built in thermoprobe for temperature measurement.
- Windows Embedded 7 for direct connection to the network server and flexible USB Printing.
- TempTrol™ Automatic Electronic Heating & Cooling 15° – 40°C ±0.2°
- AP Accuracy Option: 0.004° Arc Optical Rotation
- AP Resolution Option: 0.01, 0.001° Arc Selectable.
Rudolph manufactures its entry-level automatic 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 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.
Polarimeter Sample 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.
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. A full range of optional Polarimeter accessories are available
|AUTOPOL I Polarimeter Specifications|
|Measuring Mode||Optical Rotation
Specific Rotation Plus Concentration
User Defined Scale
|Measuring Scale||Degrees Arc Optical Rotation|
|Resolution||0.01° Arc Optical Rotation
0.01 Specific Rotation
|Accuracy||0.01° Arc Optical Rotation
0.03°Z (ISS) Sugar Degrees
|AP Acccuracy Option||Resolution: 0.001° Arc Optical Rotation
Reproducibility: 0.002° Arc Optical Rotation
Accuracy ±0.004° Arc Optical Rotation
|AP Resolution Option||AP Selectable Resolution: 0.01, 0.001° Arc|
|Reproducibility||0.01° Arc Optical Rotation|
|Measuring Range||± 89° Arc Optical Rotation
± 999.99° Arc Specific Rotation
|Prism||Glan Thompson Calcite|
|21 CFR Part 11 Compliant Software||Yes with optional PC Software|
|Temperature Control||By external water bath (Standard)
TempTrol™ Automatic Electronic Heating & Cooling 15° – 40°C
|Temp. Probe Measurement Range||10° – 100°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||8 GB Non-removable Compact Flash|
|Communication Interface||3- USB Ports,
2- RS232 serial ports,
Ethernet Port for Network Communication
|Calibration||Automatic calibration via touch screen|
|Operating System||Windows 7 Embedded|
|Polarimeter Display||8 inch Color, 800 x 600 pixel resolution with 400 nits of brightness.|
|Automatic Sensitivity Control||Measures samples with transmittance as low as 0.01% (up to O.D. 4.0)|
|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 432mm D
|Shipping Dimensions||31″W x 28″H x 26″D,
787mm W x 711mm H x 660mm 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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