VariPol Polarimeter
The SCHMIDT + HAENSCH VariPol is designed for pharmaceutic applications but can be adapted to other uses.
The new, design is nearly half the size of earlier models and is packed with new features and hardware. The integrated Peltier system can change 10°C in 30 seconds for precise measurements. After stabilization of the temperature, the measurement itself takes only 6 seconds. Optimized electronic components result in low power consumption and together with a modern standby mode, the VariPol delivers fast reaction times helping to preserve resources.
- Designed for pharmaceutical applications
- Peltier system for automatic temperature control
- 21 CFR part 11 ready
- Energy-saving durable LED’s
The VariPol offers a Peltier system for automatic temperature control. All models are 21 CFR part 11 ready and are equipped with energy-saving, long-life LEDs.
The resolution of all VariPol models fully complies with the provisions of the European and American Pharmacopoeia. The measured values are documented in accordance with GLP/GMP when the data is output on a PC, printer, or in a LIMS. In addition to three USB, one serial, and one LAN interface, all polarimeters can be expanded with additional ModBus, CanBUs, or W-LAN interfaces.
The VariPol sample tubes’ tension-free design allows fast cleaning and permits the exchange of cover glasses without birefringence. The seamless sample chamber has no dead space allowing fast rinsing without deposits. The rotatable sample tubes and quartz standards allow you to check quickly and easily their cleanliness and correct performance.
Validation / calibration
With circular polarimeters, the wavelength can change in the course of time due to aging. Therefore, regular testing and, if necessary, recalibration of the polarimeter is necessary. Sucrose solutions or so-called quartz control plates (QCP) can be used as test and calibration standards. This is possible because the optical properties (ORD) of quartz and sucrose solutions are almost identical.
Quartz control plates (QCP) are long-term stable test standards for polarimeters and are recommended by SCHMIDT + HAENSCH as test standards. For this purpose, 0.4 to 1.6 mm thin quartz disks are ground with the highest precision perpendicular to the axes and plane-parallel and installed in a stainless steel tube without tension. The sample space of SCHMIDT + HAENSCH polarimeters allows both the vertical displacement of quartz control plates and the free rotation (± 360 °) around its own axis. Rotation is the only way to determine whether the plates are tension-free and enable the polarimeter to be checked in accordance with the implementation regulations (SPS) of international standards such as ICUMSA and OIML.
Specifications
| Specifications | VariPol C | VariPol B |
| Measurement scales | ° Optical rotation, ° Specific rotation, °Z International Sugar Scale, % Concentration (g/mL, g/100mL, g/L), further scales freely definable | |
| Measuring range | ± 89.9° | |
| Resolution | 0.005° | 0.001° |
| Precision | ± 0.01° * | ± 0.005° |
| Repeatability | ± 0.01° | ± 0.005° |
| Sensitivity | Up to OD 3 | |
| Wavelength | 1 or 2 wavelengths fixed, standard 589 nm, also available 365, 405, 436, 546, 578 | |
| Measuring time | 6 to 8 sec. over the entire measuring range | |
| Measuring tubes | Up to 100 mm length; standard tubes microtubes, compact tubes Material: glass, stainless steel, hastelloy | |
| Temperature measurement | Pt1000 sensor (device) / NTC sensor (Quartz control plates and tubes) | |
| Temperature range sample temperature | 18-25 °C | 10°C to 40°C |
| Temperature resolution / precision | 0.01°C / ± 0.1°C * | 0.01°C / ± 0.1°C * |