Key points for the daily maintenance of liquid-phase deuterium lamps
Author:Orginal from HAMAG Team
In liquid chromatography systems, the deuterium lamp serves as the core light source for the UV detector; its luminous stability directly affects baseline flatness, detection sensitivity and data accuracy. Proper daily maintenance can effectively slow down light decay, extend the lamp’s service life and reduce issues such as baseline drift and excessive noise.
Standardised power-on and power-off procedure
When switching on the instrument, first warm up the main unit and the flow cell, then switch on the deuterium lamp; when switching off, first switch off the deuterium lamp, and wait until the cooling process is complete before switching off the instrument’s power supply. Avoid frequent switching on and off, as each cycle significantly reduces the lamp’s service life.
Limit screen time
Switch off the deuterium lamp whenever possible outside of testing periods, and avoid leaving it on for long periods without use. Ensure the lamp is switched off promptly during breaks in daily experiments and when the equipment is left idle overnight to minimise energy wastage from unnecessary illumination.
Keep the optical path clean and dry
Wipe the detector window and lens surfaces regularly to prevent dust, reagent residues and water marks from accumulating and reducing light transmission. Keep the environment dry and well-ventilated to prevent moisture from entering the optical path and causing the lamp to deteriorate.
Avoid vigorous shaking
The internal glass structure of the deuterium lamp is fragile; therefore, care must be taken to avoid knocks and vibrations when handling the instrument or conducting experiments, in order to prevent gas leaks from the lamp tube and damage to the filament.
Keep an eye on the status monitoring
Monitor baseline noise, absorption values and changes in luminous intensity on a daily basis. If baseline drift, a weakening signal, a darkening of the lamp body or difficulty in switching on and off occur, this indicates severe light decay and the lamp must be replaced promptly.
Notes on cleaning and replacement
Wear gloves when replacing the lamp tube; do not touch the glass tube directly with your bare hands, as the natural oils on your skin will carbonise when heated, reducing light transmission and causing premature failure of the lamp tube. Ensure that the optical alignment is checked once installation is complete.
A stable power supply
Ensure that the instrument’s power supply voltage remains stable; use a regulated power supply to prevent voltage fluctuations from damaging the lamp and causing internal components to fail.