Essential Oils Polarimeter

The Rudolph Research Analytical Autopol IV is optimised for measurement of essential oils

Spectral versatility

Try Before You Buy
The Autopol IV is available for a short term trial.

Temperature Control
Temperature control of samples is allowed through rubber gasketting in the Autopol IV door, which permits tubing to be connected from an external temperature controlled Water bath to the jacket of a jacketed polarimeter sample tube.

White Light Source Permits Spectral Versatility
The tungsten-halogen lamp employed in Autopol polarimeters is a compact, reliable, low-cost, high intensity light source that allows any desired wavelength in the visible spectrum to be selected by means of a narrow band multilayer interference filter.
The Autopol standard 10nm bandwidth is specified to permit high energy throughput and sensitivity for sample transmittances of only 0.01 % (O. D. = 4), while minimizing the effects of sample ORD and colour.

Sample Specific Programs
These programs allow for parameters such as tube length, concentration, specific rotation, wavelength, sample measurement range, measurement scale and temperature correction to be pre-specified. The programs can be labeled with an alphanumeric name (e.g. Dextrose 2). The operator simply selects the sample program from the alphabetic list and the Autopol is ready to make measurements. Sample specific programs can be set to read either Optical Rotation, specific rotation, concentration or user defined scales. A user defined scale is a linear equation based on the measured value and input parameters.

Multiple Wavelengths
The Autopol IV automatic polarimeter comes in single, dual and six wavelength models. Wavelength selection is completely automatic and is accomplished via menu selection. There are no lamps or filters to manually remove or insert. The following wavelengths are available: 365nm, 405nm, 436nm, 546nm, 589nm and 633nm. Optional wavelengths include: 578nm, 880nm and various other wavelengths are available.

TempTrol Electronic Temperature Control System
The optional TempTrol system allows push-button temperature control of TempTrol 100mm and 200mm cells or Quartz control plates. Set the temperature, push “measure” and walk away. The Autopol IV will heat or cool to a predefined temperature and then provide you with the result, all in one easy step. The TempTrol system will accurately control your sample temperature to within ±0.2°C.

High Quality Polarizing Prisms
Polarizing prisms are two of the most critical optical components in the polarimeter. Polaroid polarizers are made of a polymeric plastic where the molecules are stretches and oriented in a specific direction so as to linearly polarize light. These types of plastic sheet polarizers are very inexpensive 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 every 3 to 5 years. Glan Thompson Calcite polarizers are comprised of a carbon crystalline structure similar to diamond and have excellent light transmission characteristics and are guarantees for the life of the polarimeter.
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Temperature Display and Correction
The Autopol IV automatic polarimeter comes standard with a temperature probe which can be inserted into the Polarimeter cell. The temperature of either the sample compartment or the solution itself can be continuously displayed.

Print Format
Numerous parameters, such as sample name, tube length, concentration, wavelength, time and date, temperature correction and statistics can be printed after each polarimeter measurement or after a group of measurements. This is accomplished by designating the required parameters, via menu entry, during the print format setup mode.

USB, RS 232, and Printer Communication
The Autopol essential oils polarimeter offers 3-USB ports, 1-USB 3.0, 2-RS 232 serial ports, and an Ethernet port for connecting to a network. The RS 232 port allows data to be sent to a computer when the print key is pressed, when the computer requests the data or at predefined time intervals. Measurements can be remotely controlled from a host computer and the printout format and parameters can be selected via menu entry. Utilizing a USB port, all plug-and-play Windows compatible printers may be added.

Real-Time Clock
A real-time clock that tracks time and date. All measurements can be date and time stamped when printed out. The time is continually displayed in the upper right hand corner of the display.

Statistics
The Autopol IV calculates the mean, the standard deviation and records the minimum and maximum readings for up to 999 measurements Measured data for statistical calculation can be printed in either one of two ways: automatically, at predetermined time intervals or manually, by pressing the print key. Statistics for a batch of samples can be accomplished by pressing the page feed key. Statistics on time varying optically active samples can be compiled by measuring a sample at a predetermined rate and for a predetermined number of measurements.

Range Limits
Sample range limits can be specified in sample specific programs, (e.g. 24.8° Arc – 25.7° Arc). When a range is specified and the measurement falls outside this specification the display will read “out of range”. Two TTL level signals are available for out of range conditions. These signals are useful for process control or alarms.

Calibration and Validation
Today’s cGLP/cGMP laboratories must validate measurement and temperature. Rudolph Research Analytical polarimeters offer 6 different NIST Traceable Quartz calibration standards that can be matched to your application. The Autopol IV also comes with a temperature validation cell so that your temperature measurement can be traced to NIST.

Software
The software offers a simple, easy to use interface for collecting data from Polarimeters. It’s available in several different versions, including PC Basic, PC Purity, PC Sample Handling, and PC 21CFR Part 11. There is a version of Rudolph Research Analytical software available for all of our polarimeters. All data can be exported to Excel.

In April 2022 there was a change to the European Pharmacopeia regarding the measurement of essential oils such as Sweet Orange Oil. They now need to be measured in a 0.1 dm length cell instead of the standard 100mm polarimeter cell. Compliance with the new European Pharmacopeia requirements can be achieved with the purchase of a Rudolph 0.1dm/10mm length cell for use with Rudolph’s TempTrol® heating and cooling system.

Also available the Autopol V, Autopol V Plus and Autopol VI

Measuring Mode: Optical Rotation Specific Rotation Specific Rotation Plus Concentration User Defined Scale Sugar Degrees °Z(ISS)
Measuring Scale: Degrees Arc Optical Rotation
Resolution: 0.001° Arc Optical Rotation 0.001% Concentration 0.001 Specific Rotation
Accuracy: 0.002° up to 1°, 0.2% up to 5°, 0.01° above 5°
AP Accuracy Option: Autopol IV Single ±0.002° Arc Optical Rotation Autopol IV Dual ±0.002° Arc Optical Rotation Autopol IV Six Wavelength Accuracy: (546nm and 589nm): ±0.002° Arc Optical Rotation
AP Resolution Option: Selectable Resolution: 0.01, 0.001, 0.0001° Arc
Reproducibility: 0.002° Arc Optical Rotation
Measuring Range Arc Optical Rotation: ± 89.99°
Measuring Range Arc Specific Rotation: ± 999.99°
Measuring Range Concentration: 0-99.9%
Prism: Glan Thompson Calcite
Optical Wavelengths: 365nm, 405nm, 436nm, 546nm, 589nm, 633nm
Wavelength Selection: Touchscreen Selectable: 1, 2 and 6
21 CFR Part 11 Compliant Software: With optional PC software
Temperature Control: External water bath (Standard) TempTrol™ Automatic Electronic Heating & Cooling 15° – 40°C ±0.2° (Optional)
TempTrol Accuracy: ±0.2°C (optional)
Temperature Probe Range: 10°-100°C
Temperature Probe Accuracy: ±0.1°C
Measurement Time: 4°/sec slewing rate & 5 sec nominal settling time
Light Source: Tungsten-Halogen 6V, 20W, Avg. 2,000 hr. 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 Ports, Ethernet Port for Network Connection
Calibration: Automatic calibration via touchscreen
Operating System: Windows Embedded
Display: 8 inch colour, 800 x 600 pixel resolution with 400 nits of brightness.
User Interface: Touchscreen
Automatic Sensitivity Control: Measures samples with transmittance as low as 0.01% (up to O.D. 4.0)
Temperature Compensation: Temperature of the sample can be corrected to a reference temperature
Calendar/Clock: Battery-backed clock. Time and date sent to computer and printer
Input Power: 100 – 240V, 50/60Hz
Dimensions: 762mm W x 431.8mm H x 279.4mm D
Weight: 39 kg