Shimadzu Spd20a User Manual Upd (Android)
| Component | Frequency | Action | |-----------|-----------|--------| | Flow cell | Monthly (or when noise increases) | Flush with methanol/water. Remove and clean with 50% nitric acid if contaminated. | | Deuterium lamp | 2000 hours typical | Replace when energy < 800 counts or baseline unstable. | | System check | Weekly | Verify wavelength accuracy using holmium oxide filter (optional accessory). |
: Switch on the main power at the bottom left of the unit.
Features a temperature-controlled flow cell (TC-Optics) to ensure baseline stability against ambient temperature changes. 2. Operational Procedures
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This section provides an overview of the major functional components described in the service manual.
The SPD-20A uses an internal low-pressure mercury lamp for automatic wavelength calibration in the UV region.
If you are looking for specific operational or repair guidance, the following resources are highly regarded in the chromatography community: Service Manual : For technical adjustments and optical alignment, the SPD-20A Service Manual | | System check | Weekly | Verify
| Specification | Value | | :--- | :--- | | | 190 to 700 nm (SPD-20A); 190 to 900 nm (SPD-20AV) | | Spectral Bandwidth | 8 nm | | Wavelength Accuracy | ±1 nm max | | Wavelength Precision | ±0.1 nm max | | Noise Level | 0.5 × 10⁻⁵ AU (under specified conditions) | | Drift | 1 × 10⁻⁴ AU/h (under specified conditions) | | Linearity | 2.5 AU (ASTM standard) | | Light Sources | D2 lamp (UV), Hg lamp (calibration). SPD-20AV also includes W lamp (Vis) | | Flow Cell Capacity | 12 µL | | Flow Cell Pressure | 12 MPa max | | Dimensions (W × D × H) | 260 × 420 × 140 mm | | Weight | 13 kg |
Operating the SPD-20A correctly is crucial for reliable results. The following points are essential:
is designed to deliver industry-leading performance. It features a temperature-controlled cell, reducing refractive index changes caused by fluctuations in room temperature, which directly translates to a stable baseline and higher sensitivity. 190 to 700 nm (Standard SPD-20A). Noise Level: 0.5 x 10-510 to the negative 5 power AU (highly sensitive). Linearity: 2.5 AU. Known for its sensitivity and reliability
AU max, making it highly sensitive for trace component detection. Up to 2.5 AU (ASTM standard). Bandwidth: 8 nm.
Press the key until $\lambda$ (wavelength) appears on the screen.
Flush the cell with 0.1 M Nitric Acid ( HNO3cap H cap N cap O sub 3