Automatic Polarimeter – AUTOPOL® II

The AUTOPOL® II is designed as a general purpose automatic polarimeter for budget focused Contract Laboratories, Food Laboratories, and College Chemistry Laboratories. Great price yet packed with features and Quality! The Autopol® II offers the same standard and optional features as the Autopol® I but allows greater wavelength flexibility with 589nm and 546nm standard wavelengths and optional 365nm, 405nm, 436nm, 578nm, and 633nm available.

Autopol® II Polarimeter Standard Features:

  • 0.01° Arc Accuracy.
  • 589nm and 546nm wavelengths. (A total of 2-4 wavelengths may be ordered initially or as needed)
  • Built in thermoprobe for temperature measurement.
  • Windows Embedded for direct connection to the network server and flexible USB Printing.

Optional Features:

  • TempTrol™ Automatic Electronic Heating & Cooling 15° – 40°C ±0.2°
  • 365nm, 405nm, 436nm, 578nm, and 633nm wavelengths. (A total of 2-4 wavelengths may be ordered initially or as needed)
  • AP Accuracy Option: 0.003° Arc Optical Rotation
  • AP Resolution Option: 0.01, 0.001° Arc Selectable.

Quality Components

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 low price ($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 Monitoring

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 Polarimeter 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. Optional wavelengths of 365nm, 405nm, 436nm, 578nm, and 633nm are available. The Autopol® II also includes the Standard Polarimeter accessories Package shown in Figure C or you can upgrade to the Calibration Package shown in Figure D.


All Rudolph Instruments carry our exclusive 20 Commitment to service your instrument.

Rudolph Research Analytical offers a comprehensive range of Preventive Maintenance and Service Programs. Rudolph has demonstrated a commitment to its customers by keeping installed instruments operational, not only for 20 years, but in some cases for over 40 years. This long-term commitment to keeping our instruments running makes the cost of ownership, over the life of a Rudolph Instrument, one of the lowest in the laboratory market segment. At the date this document was published, there is no other laboratory instrument manufacturer guaranteeing service and technical support for 20 years. View the entire 20 Service Guarantee. 


Autopol II – Specifications

AUTOPOL II Specifications
Measuring Mode

Optical Rotation
Specific Rotation
Specific Rotation Plus Concentration
User Defined Scale
Sugar Degrees

Measuring Scale

Degrees Arc Optical Rotation


0.01° Arc Optical Rotation
0.01% Concentration
0.01 Specific Rotation


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 ±0.003° Arc Optical Rotation

AP Resolution Option

AP Selectable Resolution: 0.01, 0.001° Arc


0.01° Arc Optical Rotation

Measuring Range

± 89° Arc Optical Rotation
± 999.99° Arc Specific Rotation
0-99.9% Concentration


Glan Thompson Calcite

Optical Wavelengths

Optional Wavelengths 365nm, 405nm, 436nm, 578nm.

Wavelength Selection

Touchscreen Selectable:
2 standard, 4 Optional

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
±0.2° (Optional)

Temp. Probe Measurement Range

10° - 100°C

Temp. Probe Measurement Accuracy


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

32 GB Non-removable Compact Flash

Communication Interface

3- USB Ports, 1-USB 3.0
2- RS232 serial ports,
Ethernet Port for Network Communication


Automatic calibration via touch screen

Operating System

Windows Embedded


8 inch Color, 800 x 600 pixel resolution with 400 nits of brightness.

User Interface


Automatic Sensitivity Control

Measures samples with transmittance as low as 0.01% (up to OD 4.0)

Input Power

100 - 240V, 50/60Hz

Operation Dimensions

24.3"W x 12.7"H x 17"D,
617mm W x 323mm H x 432mm 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