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The Golden Rule for Daily Maintenance of Online Dairy Analyzer
Date: 2025-09-22Read: 41
Online dairy analyzerIt is the "real-time quality inspector" of the dairy production line, which can monitor key indicators such as fat, protein, lactose, density, etc. of raw milk, yogurt, formula and other products online. Its stability directly affects production efficiency and product quality. Following the "Golden Rule" for daily maintenance is the core of ensuring the long-term accurate operation of instruments.
Golden Rule 1: Cleanliness is the foundation, eliminating pollution interference
Dairy products are prone to residual protein, fat, or carbohydrate substances (such as lactose crystals in milk powder). It is necessary to rinse the sample flow cell and sensor probe with warm water (below 40 ℃) and neutral cleaning agents (such as food grade detergent) every shift (avoid using organic solvents to prevent corrosion of the optical window). Stubborn residue (such as fat layer) should be lightly brushed with a soft bristled brush (steel wire balls are prohibited), and finally rinsed with pure water (resistivity>18M Ω· cm) and dried (compressed air or nitrogen). Wipe the optical lens of the near-infrared spectrometer with a dedicated optical cleaning cloth every week (to avoid fingerprints or dust reducing the light transmittance).
Golden Rule 2: Calibration is the key to ensuring accurate data
The instrument needs to be calibrated daily with a standard sample (such as a reference milk with a known fat content of 3.2% and protein content of 3.0%) when turned on, to verify the deviation between the measured value and the standard value (allowing for fat ± 0.1% and protein ± 0.05%). Perform full-scale calibration using high/low concentration standard samples (such as 0.5% -5.0% fat and 2.0% -4.0% protein) every month, and adjust the calibration curve parameters inside the instrument. If the detection module is replaced (such as switching from fat detection to lactose detection), zero and range calibration needs to be performed again.
Golden Rule Three: Component Protection, Extended Service Life
• Circulation pool maintenance: The circulation pool is a component that comes into direct contact with the sample, and its inner wall needs to be checked monthly for scratches (affecting optical detection) or scaling (soaked in dilute nitric acid solution and rinsed, strong alkali is prohibited). Sealing rings (such as O-rings) should be replaced quarterly (recommended fluororubber material, resistant to dairy corrosion).
• Light source and sensor: Near infrared light sources (such as tungsten halogen lamps) typically have a lifespan of 1000-2000 hours and require regular inspection of light intensity output (if it decreases by more than 20%, replace the light source); Spectral sensors (such as InGaAs detectors) should avoid prolonged exposure to strong light (protected by a light shield during shutdown).
• Gas circuit and circuit: If the instrument is equipped with a purge gas (such as nitrogen) to prevent sample residue, the gas circuit pressure (0.1-0.3 MPa) and filter (replace the activated carbon filter every quarter) need to be checked; Circuit modules (such as control motherboards) need to be kept dry (ambient humidity<60%) to avoid condensation water damaging electronic components.
Golden Rule Four: Operating Standards, Avoiding Human Errors
Strictly follow the operation manual for startup and shutdown (such as preheating for 30 minutes before testing), and avoid frequent startup and shutdown (which may affect the lifespan of the light source); The sample temperature should be controlled between 4-40 ℃ (pre-treatment is required if it exceeds the range) to prevent temperature fluctuations from affecting the detection results due to changes in density or viscosity; If there are abnormalities detected (such as numerical fluctuations or errors), first check whether the sample is uniform (without sediment or bubbles), and then investigate whether the flow cell is blocked.
Online dairy analyzerIt is the 'data center' of dairy production. Following these golden rules, integrating cleaning, calibration, component protection, and standardized operations into daily processes is necessary to ensure the continuous and stable operation of the instrument, providing precise protection for the quality and safety of every drop of dairy products.