What are the Factors Influencing the Signal Stability of Colorimeter?

In order to overcome or reduce the misjudgment caused by stability, reduce the economic loss of users, and improve the use efficiency of the colorimeter, it is necessary to analyze the main factors of the lack of stability of the instrument detected by the sample.

The internal factors (factory design and processing)

In order to make the instrument work normally and reliably and give accurate and reliable test results, and the detection efficiency is high, the hardware manufacturing quality must pass the test, and the following contents are mainly considered:

  • The circuit design is stable and reliable. The selection of electronic components is good, and the drift of electrical parameters is small. The linearity of the potentiometer for regulation is better to reduce power fluctuations.
  • The DC power supply of the electronic circuit of each unit is unstable, which affects the normal and stable operation of the circuit.
  • The DC power supply of the light source power supply is unstable, which affects the stability of the luminous intensity of the light source lamp.
  • The performance of the photoelectric receiver tube is degraded or damaged.
  • The optical components are processed accurately, with good focusing, small error, and stable mechanical positioning. After the single beam generated by the color spectrophotometry passes through the sample, the light spot falls on the cathode surface of the photo-receiving tube at the optimal position.
  • The machining accuracy of the caliber 4mm pocket colorimeter should be high, such as manual sample push into the pull rod, precise mechanical movement and positioning, flexible and convenient operation and good hand feeling. The cuvette bracket should be fixed and clamped well, so that it will not shake.
  • It is especially important that the light door baffles are fully free to fall. After many instruments are used for a long time, due to the application environment is relatively harsh, and the rust phenomenon gradually accumulates, resulting in the light door being closed loosely, resulting in light leakage.
  • The sample chamber of the instrument has good airtightness, is impervious to stray light, and is free from external interference as much as possible to reduce the intrusion of stray light.
Color Spectrophotometer

The external factors

  • The AC power supply is unstable, and sometimes it can be seen that the ambient light of the instrument is flashing momentarily. This phenomenon is the same as there is a large load in the power supply network, which causes the power supply voltage to fluctuate. The power supply voltage should be guaranteed to be within the range of 220 (1±10%)V, and there is no sudden change. If the AC power supply is unstable, it can be stabilized by a glue flow electronic voltage stabilizer. Unstable AC power supply and thunder and lightning also cause unstable AC power supply, pointer swings appear on pointer instruments, and display jumps appear on digital display instruments.
  • The quality, operating experience and proficiency of the operator will also affect the normal performance of the instrument.
  • The collection of samples or samples should be standardized and meet the proposed requirements.
  • The lack of environmental vibration, workbench and other conditions does not meet the strict seismic requirements.
  • The preheating time of the instrument is not enough. Generally, the instrument is turned on and warmed up for about 20 minutes before use, before data detection can be performed, and the non-faulty startup display can also be solved.
  • When the color of the desiccant turns red, it should be replaced in time or the desiccant should be dried before use.
Low cost pocket colorimeter

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