RID-20A Refractive Index Detector

Shimadzu has a new lineup of detectors available for your laboratory. Please visit our HPLC/UHPLC Detectors page to learn more.
RID-20a refractive index detector

Inheriting the stability and extensibility that are the strengths of the Prominence series, the new RID-20A model of differential refractive index detector is designed with a new reference-cell auto-purge feature and validation support function.

Reduced Stabilization Time and Improved Baseline Stability: After the unit has been powered on for 30 Minutes

RID-20A  baseline

The RID-20A reduces the time to stabilization after power-on dramatically by utilizing dual temperature control for the optical system.
The stable baseline provides the accurate analysis of the molecular weight distribution.

Short Warm-up Time and Improved Baseline Stability

optical system inside a dual temperature controlled block

The optical system is housed inside a dual-temperature-controlled block. The temperature of the incoming mobile phase is controlled in two stages; consequently, the stabilization time is significantly shorter than with conventional systems. This dual-temperature control also helps significantly reduce baseline drift, thus increasing the reliability of analysis data.

rid-20a with and without cell temperature control


Shimadzu's Proprietary Technology Supports Highly Sensitive Analysis to Preparative Analysis Applications

conentration of sucrose

The four-partition photodetector in the RID-20A allows a wide refractive index range (0.01 to 5000 μRIU). The single detector supports all applications from highly sensitive measurements to preparative measurements using the three operation modes shown below.

A (Analytical) Mode High-sensitivity to general-purpose analysis
P (Preparative) Mode High-concentration analysis,
semi-preparative analysis (up to 20 mL/min)
L (Large-prep.) Mode Flow selection block
allows large-volume preparative analysis. (up to 150 mL/min)
4 partitioned detector element

4-Partitioned Detector Element

The detector element of the RID-20A is partitioned into four parts, and the parts used can be changed electrically. In A mode (for high-sensitivity analysis), the partitions are grouped left-right (combinations of A+C and B+D), and in P and L modes (for preparative analysis), the partitions are grouped top-bottom (combinations of A+B and C+D). In P and L modes, because measurement is possible regardless of the position of the element's center line, large refractive indexes for high-concentration samples can be handled.


30%*Savings in Solvent Usage over Conventional Performance and Reduced Environmental Burden

use of recycling valve does not affect the baseline

The amount of mobile phase consumed can be saved by returning column eluate to the mobile phase bottle during intervals when no component peaks are eluted. Cost of analysis per sample is reduced and burden placed on the environment is mitigated. The recycle valve kit can be attached to the RID-20A and the SPD-20A/20AV.

When performing a 15-minute analysis 50 times
(flow rate: 1 mL/min)

Without recycle valve kit ... 750 mL
With recycle valve kit ... 500 mL
→ Mobile phase usage reduced by approx. 30%*
(* under specified conditions)


Pressure Relief Valve

The RID-20A incorporates various safety features. Its maximum pressure is five times that of former Shimadzu products and, as a standard feature, it incorporates a sensor that detects leakage from the cell unit. For extra safety, a pressure relief valve that prevents problems related to back-pressure irregularities is also available as an option.


Refractive index range 1 to 1.75 RIU Maximum operating flow rate 20 mL/min (150 mL/min with option
Noise level 2.5 ×10-9 RIU max Temperature control of cell unit 30 to 60 ℃
Drift 1×10-7 RIU/h max Cell volume 9 μL
A mode: 0.01 × 10-6 to 500 × 10-6 RIU
P and L mode: 1 × 10-6 to 5,000 × 10-6 RIU
Cell withstand pressure 2 MPa (cell unit)
0.05 to 10 sec, 10 steps
Operating temperature range
4 to 35 ℃
Polarity switching  Supported Dimensions, weight Dimensions, weight W260 × D420 × H140 mm, 12 kg
Zero adjustment Auto zero, optical zero,  fine zero Power requirements AC 110 V, 230 V, 150VA, 50/60 Hz

 Please contact a representative if you need Hexafluoroisopropanol(HFIP)  as the mobile phase.

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