The spectrophotometer is a measuring instrument that samples reflective or transmissive objects at discrete wavelengths. It can be divided into ultraviolet spectrophotometer, visible spectrophotometer (or colorimeter), infrared spectrophotometer or atomic absorption spectrophotometer.

Things that should be paid attention to in the use of laboratory spectrophotometer:

1. Proper placement of the cuvette holder and the cuvette

Some users do not pay enough attention to this problem, and accidental errors are caused by improper operation, which seriously affects the analysis results. First of all, do not tilt the cuvette. A slight inclination will make the absorption path lengths of the reference sample and the sample to be tested inconsistent, and may also prevent incident light from passing through the sample cell, resulting in a failure of the specific accuracy of the test. Secondly, push and pull the cuvette holder in place during each test. If it is not in place, it will affect the repeatability or accuracy of the test value. Finally, always keep the cuvette clean to prolong its service life.

2. Use of desiccant

The failure of the desiccant will cause the digital display to be unstable, and it is unable to adjust the "0" point or "100%" point (the circuit or photocell is damp). The reflector is moldy or stained, and affects the light efficiency and the increase of stray light. In view of the above reasons, the chemical spectrophotometer should be placed away from places with high humidity such as pools, and the desiccant should be replaced or baked regularly.

3. Operating environment

The spectrophotometer should avoid direct sunlight, strong electric fields, avoid sharing electricity with higher-power electrical equipment, and avoid corrosive gases, etc.