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Understanding the core capabilities of the SPD-20A ensures you operate the instrument within its optimal parameters. Deuterium ( D2cap D sub 2 ) lamp for ultraviolet (UV) range. An optional Tungsten (
Turn on the power switch on the bottom left corner of the unit.
: If you notice high backpressure or ghost peaks, the flow cell may be contaminated. Flush with a compatible strong solvent (like Isopropanol) or a dilute nitric acid solution (refer to the specific manual for concentrations).
Ensure the correct wavelength is selected and the flow cell is clean. Verify that the flow cell path is not obstructed.
Install in a well-ventilated room, away from corrosive gases, sparks, or strong magnetic fields. shimadzu spd20a user manual
Flush with HPLC-grade water, followed by a mild 0.1M Nitric Acid ( HNO3cap H cap N cap O sub 3
Featuring advanced optics, the detector achieves a noise level as low as
Pump your mobile phase through the system at your validated analytical flow rate. Ensure no air bubbles are trapped in the cell.
Internal holmium oxide filter alignment failure or aging lamp. Understanding the core capabilities of the SPD-20A ensures
For standard HPLC columns (3–5 µm particle size), a sampling rate of 10 Hz is ideal. For faster, narrow-bore columns, increase this to 20 Hz to capture sharp peaks without distortion.
Setting up the SPD-20A correctly is essential for optimal performance. This section outlines the key steps from the manual.
Set the acquisition channel and desired wavelength (e.g., 280 nm) within the software's detector panel.
Accesses the validation and parameter customization menus. : If you notice high backpressure or ghost
Comprehensive Guide to the Shimadzu SPD-20A User Manual: Operation, Maintenance, and Optimization
If managing via the keypad, press FUNC until LAMP appears, select ON , and press ENTER . Allow the D2cap D sub 2
By adhering to these operational protocols and maintenance schedules outlined in the Shimadzu SPD-20A factory guidelines, your HPLC system will yield reproducible, high-sensitivity data for years to come. Before we conclude,Here are a few options:
Maintain a stable room temperature between 4°C and 35°C. Avoid direct sunlight and AC vents.
Air bubbles or chemical contamination trapped in the flow cell can cause erratic baseline spikes or phantom peaks.
A fundamental step prior to sample injection is the "Auto-Zero" function. As outlined in the operational protocols, the detector measures the absorbance of the mobile phase continuously. Before the sample enters the flow cell, the instrument must establish a zero-absorbance baseline. The Auto-Zero command electronically sets the current absorbance to 0.000 mAU. This must be performed when the mobile phase composition is stable and the flow rate is constant. Failing to auto-zero can lead to inaccurate peak area calculations and integration errors.
