The Shodex RI-201H Refractive Index Detector incorporates a double temperature control system that ensures rapid start-up and exceptionally stable baseline performance, even under varying ambient conditions. A built-in solvent leak sensor provides an immediate output signal to halt pump flow in the event of an internal eluent leak, enhancing operational safety. The detector is designed for seamless integration with modern HPLC systems, featuring well-organized output signal terminals (recorder, integrator) and a USB communication port for high-level automation and data handling. Its deflection-type optical design, combined with a purge valve for easy flow switching, delivers reliable and reproducible measurements for a wide range of non-UV-absorbing compounds.
| Parameter | Specification / Range |
| Detection Principle | Deflection type |
| Recorder Output | 10 mV/FS; Range: 0.25 – 512 μRIU/10mV (12 steps) |
| Integrator Output | 2 mV/μRIU (512 μRIU/V) or 8 mV/μRIU (128 μRIU/V) |
| Integrator Range (settable) | 64 or 256 μRIU/1V |
| Time Constant | 0.1, 0.25, 0.5, 1, 1.5, 2, 3, 6 sec (8 steps) |
| Temperature Control | 30 – 50 °C (1 °C increment) or OFF |
| Baseline Shift Adjustment | 0 – 200 (50 nRIU increments) at 10 mV output |
| Polarity | Positive / Negative selectable |
| Leak Sensor | ON / OFF selectable |
| Communication | USB port |
| Contact Signal Outputs | ERROR OUT, LEAK OUT, READY OUT (contact closure) |
| Flow Line Connections | IN: 1.6 mm O.D. × 0.25 mm I.D. SS tube; OUT: 2.5 mm O.D. × 1.5 mm I.D. PTFE tube |
| Power Requirements | 100/120 VAC or 220/240 VAC (model dependent); 50/60 Hz |
| Fuse | Time-lag type, T3.15A / 250V |
| Dimensions (approx.) | Not specified in manual – contact Shodex |
| Weight (approx.) | Not specified in manual – contact Shodex |
The Shodex RI-201H Refractive Index Detector provides continuous, real-time measurement of the refractive index difference between a sample cell and a reference cell, enabling universal detection of non-chromophoric compounds such as carbohydrates, polymers, alcohols, and organic acids. Its deflection-type optical system delivers high sensitivity and linear response over a wide dynamic range, while the dual-zone temperature control guarantees minimal baseline drift and short warm-up time. The detector is fully compatible with both analog data systems (recorder/integrator) and digital platforms via USB, supporting automated methods, remote monitoring, and event synchronization. With integrated leak detection and robust fluidics, the RI-201H is ideally suited for gel permeation chromatography (GPC), quality control, and routine analysis in pharmaceutical, chemical, and food industries.