Wilten Instruments has a wide range of instruments. Because of the variety of options on some products we are not able to mention all of them on our website. Complete information is available on demand.
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Home  /  Polarimeters  /  ADP450

Single wavelength polarimeter

With low maintenance LED light source. Suitable for sugar, food, chemical and pharmaceutical industries.

The ADP400 polarimeters are available with or without XPC – Xylem’s patented internal Peltier temperature control system. Both models use standard ICUMSA polarimeter tubes with a maximum length of 200mm.

These polarimeters contain proven optics, pioneered by Bellingham + Stanley, featuring “no maintenance” yellow LED and interference filter. Combined with a photodiode detector these technologies allow for the reading of samples of up to 3.0 OD at the commonly used sodium (589nm) wavelength. ADP400 polarimeters feature angular and sugar scales (ISS) and can be programmed with user scales as well as industry standard methods for displaying invert sugar, inversion (A-B) or when applying other factors such as tube length and concentration, Specific Rotation (or concentration when entering specific rotation). This flexibility makes them ideal for use within laboratories where compliance with Pharmacopoeia is required.

Three decimal place precision
makes for reliable results

ADP400 Series polarimeters have a resolution of 0.001 angular degrees (°A) and are capable of reading to an accuracy of ±0.010 °A. When working under laboratory controlled conditions, ADP400 polarimeters also offer excellent reproducibility of up to 0.002 °A.

Additionally an easy-to-use Methods system gives convenient access to popular measurement types including continual measurement of Optical Rotation, Specific Rotation, Concentration, Inversion, or our new “single-shot” measurement which gives a snapshot result at any given time.

Continuous or discrete “single-shot”
reading with SMART temperature stability

You can take readings with the ADP400 Series polarimeter in either continuous measurement or our new ‘single-shot’ mode. In continuous mode a reading is taken over a set period of time and a stabilised result displayed at the end of the period. It is excellent for monitoring instrument and sample stability, giving the user a “feel” for the reading obtained.

The ADP400 Series’ new ‘single-shot’ mode is ideal for pharmaceutical applications where a discrete value is provided without the interpretation of the operator, satisfying operating procedures where interpretation by a third-party, the operator, is not permitted.

SMART temperature stability ensures accurate reading for pharmaceutical applications. The PHR-MEAN Method allows a number of different readings to be taken from a batch of samples and the statistical report, showing the average, high and low results together with standard deviation can then be printed or stored to file. With SMART temperature stability enabled, the ADP450 will only give a result when the instrument has displayed a stable temperature over a predetermined timeframe.

Peltier Temperature controlled polarimeter
with patented XPC technology

Interchangeable contact Peltier plates facilitating measurement at a stable temperature using Peltier control. This stabilises the temperature of the sample being measured, making for easy readings in the laboratory.

To take a reading:

  • Place the supplied XPC adaptor on the instrument rails in the ADP450 polarimeter sample chamber, creating a temperature controlled surface
  • Apply the sample to the polarimeter tube making sure no entrapped air bubbles are blocking the light beam
  • Place the tube into the supplied XPC adaptor
  • The tube will easily slot into the XPC adaptor in the ADP450 polarimeter sample chamber
  • Continuous measurement will proceed, or a “single-shot” reading will automatically start after sample application
  • Remove and clean the polarimeter, leaving the XPC adaptor ready for the next sample


  • XPC Temperature Control
  • Up to 200mm tube length
  • Standard ICUMSA tubes
  • Continuous or single-shot readings
  • Conforms to USP/EP/BP/JP (@589nm)


Angular Degrees (°A)
International Sugar Scale (°Z)
User Scales/Methods
-355 to +355
-225 to +225
Angular Degrees (°A)
International Sugar Scale (°Z)
0.01/0.001 (selectable)
Angular Degrees (°A)
International Sugar Scale (°Z)
± 0.010
± 0.030
Precision (Reproducibility)*
Angular Degrees (°A)
International Sugar Scale (°Z)
± 0.002
± 0.005
User Scales & Methods Library PHR-MEAN statistical, Specific Rotation, Concentration, Inversion (A-B), Invert Sugar, User Defined.
Reading Time Continuous measurement and display or single shot (selectable)
Tube Length 10 to 200mm
Sample Illumination Sodium (589nm) Light Emitting Diode (100,000+ hours)
Beam Diameter 4mm
Optical Density 0.0 to 3.0 OD
Instrument Housing Polyurethane foam with aluminium base
Interfaces 1 x USB (A), 1 x USB (B), 1 x Ethernet, RS232 via USB adaptor (optional accessory)
Power Instrument: 24 V DC, ±5%, <2A
External PSU: 100-240V, 50-60Hz (supplied)
Humidity Range <90% RH (non condensing)

ADP430 VS ADP450

Temperature ADP430 ADP450 (Peltier)
Control None or external waterbath Patented XPC Technology
Compensation None, ICUMSA, Quartz or User Defined
Measuring Range 5-40 °C 15-35 °C
Sensor Accuracy ± 0.1 °C ± 0.1 °C
Stability Waterbath dependent ± 0.2 °C
Stability Checks None/delay on single-shot None/delay or SMART

The ADP450 polarimeter is supplied with a 200mm XPC tube and adaptor.