What factors affect the detection accuracy of coal automatic industrial analyzer?
Date: 2025-10-30Read: 22
Detection accuracy is the core performance indicator of coal automatic industrial analyzer, which is affected by four factors: sample, equipment, operation, and environment.
- Insufficient representativeness of the sample will directly affect the results, and it needs to be divided according to the standard quartering method to ensure that the particles are uniform (generally required to be less than 0.2mm) and free of impurities.
- Inadequate sample pretreatment, such as failure to pre dry free water at 105 ℃, or sample moisture and oxidation, can lead to deviations in moisture and volatile matter determination.
- Sample weighing error, if the sample spills or the balance reading is not stable during weighing, will be recorded and directly transmitted to the final result.
- The accuracy of electronic scales deteriorates and is not calibrated regularly (it is recommended to calibrate every 3-6 months), which can lead to weight measurement errors.
- Deviation in the temperature control system, where the actual temperature of the heating furnace does not match the set temperature, or the constant temperature zone is uneven, can affect the degree of moisture drying, ash burning, and volatile matter release.
- The quality and condition of the crucible. If the crucible is not dried, has cracks or residual ash content, it will increase the blank weight error. It is necessary to use a crucible that meets the standards and pre treat it in advance.
- The sealing performance decreases, and the sealing of the furnace body is poor when measuring volatile matter. Air entering can lead to higher volatile matter results.
- The parameter settings of the detection program are incorrect. If the heating rate and constant temperature time are not set according to the GB/T 212 standard, it will deviate from the detection specifications.
- Improper loading of samples, overly dense placement of crucibles leading to poor airflow in the furnace, or excessive layering of samples in the crucible can affect the uniformity of heat transfer.
- Failure to maintain equipment in a timely manner, aging heating elements, and failure to replace sensors in a timely manner can lead to unstable equipment performance.
- Excessive temperature fluctuations (ideal range 15-30 ℃) and excessive humidity (≤ 70%) in the laboratory can affect the accuracy of the electronic balance and sample stability.
- There is airflow interference in the environment (such as near air conditioning vents, direct blowing from doors and windows), which can cause inaccurate weighing on the balance.
- The unstable power supply voltage will affect the heating rate and temperature control accuracy of the heating furnace, and a voltage regulator power supply is required.