VEE GEE 4600P-SC200 is a replacement glass sample cell with bubble trap for the VEE GEE C25L Manual Polarimeter (4601P). The cell measures 200 mm in path length and holds 18 mL of sample, constructed from clear glass. The doubled path length compared to the standard 100 mm cell provides doubled sensitivity for optical rotation measurements — particularly valuable for dilute solutions, low-rotation samples, or applications requiring enhanced measurement precision. The integrated bubble trap migrates air bubbles away from the optical path, ensuring clean, bubble-free readings.
Features & Benefits
- 200 mm Path Length — Doubled Sensitivity: At twice the path length of the 100 mm cell (4600P-SC100), the 200 mm cell doubles the observed optical rotation value for any given sample concentration. This makes low-rotation compounds readable on instruments that would show marginal deflection with a 100 mm cell, and improves overall measurement precision for dilute solutions.
- Integrated Bubble Trap: The bubble trap reservoir allows air bubbles introduced during filling to migrate out of the optical path — eliminating the most common source of measurement error, especially when loading viscous or freshly prepared samples.
- 18 mL Sample Volume: The 18 mL capacity supports the longer tube length while remaining manageable for typical lab sample sizes — appropriate for aqueous solutions, sugar solutions, pharmaceutical actives, and essential oils.
- Clear Glass Construction: Glass provides broad chemical compatibility with aqueous and organic solvent systems used in polarimetry, including sucrose solutions, pharmaceutical actives in ethanol or DMSO, and fragrance/essential oil samples — offering superior solvent resistance versus plastic cells.
- Direct OEM Replacement for C25L: Factory-matched for the VEE GEE C25L Manual Polarimeter (4601P). One 200 mm cell is included with every new C25L polarimeter purchase — this SKU is the direct replacement for labs that have broken or worn out the original.
- 1-Year Warranty: Backed by VEE GEE Scientific's standard accessory warranty.
Specifications
| Property | Value |
|---|---|
| SKU | 4600P-SC200 |
| Path Length | 200 mm |
| Sample Volume | 18 mL |
| Material | Glass |
| Color | Clear |
| Bubble Trap | Yes |
| Compatible Instrument | VEE GEE C25L Manual Polarimeter (4601P) |
| Dimensions (L × W × H) | 8.25" × 1.5" × 1.25" (21.0 × 3.8 × 3.2 cm) |
| Quantity | 1 Each |
| Warranty | 1 Year |
| Country of Origin | China |
| Brand | VEE GEE Scientific |
100 mm vs. 200 mm Cell: Which Should I Use?
| Feature | 4600P-SC100 (100 mm) | 4600P-SC200 (200 mm) |
|---|---|---|
| Path Length | 100 mm | 200 mm |
| Sample Volume | 11 mL | 18 mL |
| Sensitivity | Standard | 2× (doubled) |
| Best For | Standard concentration samples, routine QC | Dilute solutions, low-rotation compounds, high-precision work |
| Included with C25L? | Yes (1× included) | Yes (1× included) |
Laboratory Applications
The 4600P-SC200 is chosen over the 100 mm cell when measurement sensitivity is the priority. Pharmaceutical labs testing optical rotation of dilute API solutions — where the 100 mm cell reading falls near the instrument's resolution limit — use the 200 mm cell to double the observed rotation and obtain a more definitive result. Academic teaching labs use the 200 mm cell when demonstrating optical activity in sucrose or tartaric acid solutions at lower concentrations. Food QC labs working with near-threshold sugar concentrations benefit from the enhanced sensitivity. For standard-concentration routine measurements and most food and beverage applications, the 4600P-SC100 (100 mm) is sufficient. For the complete C25L polarimeter instrument, see the VEE GEE 4601P Manual Polarimeter.
Frequently Asked Questions
Does the 4600P-SC200 come with the C25L polarimeter, or is it sold separately?
Both the 100 mm and 200 mm cells are included with each new VEE GEE C25L polarimeter (4601P) purchase. The 4600P-SC200 is the standalone replacement part — sold separately for when the original 200 mm cell is broken or needs to be replaced. If you are ordering a new polarimeter, the 4601P already includes both cell lengths.
When should I use the 200 mm cell instead of the 100 mm cell?
Use the 200 mm cell when your sample has a low optical rotation value that produces a reading near the resolution limit of the C25L (0.1°), or when working with dilute solutions where the 100 mm cell gives a marginal reading. The 200 mm cell doubles the observed rotation value, making it much easier to read precisely. For routine, well-concentrated samples, the 100 mm cell is typically sufficient and requires less sample volume.
How do I calculate specific optical rotation using the 200 mm cell?
When using a 200 mm (0.2 dm) cell, the path length (l) in the specific rotation formula [α] = α / (l × c) is 0.2 dm. Divide the observed rotation (α, in degrees) by 0.2 dm and the sample concentration (c, in g/mL) to obtain specific rotation. This is the same formula as for the 100 mm cell — only the path length value changes.
Ordering
Authorized dealer, ships from USA inventory. Serving academic, government, and research laboratories nationwide.