Calibration Weights

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Veidt Weighing is a calibration weight factory in china, calibration weights are high-precision quality measurement tools used in the field of metrology to calibrate and verify the accuracy of various weighing equipment. These precision manufactured metal blocks represent known and precise quality values, playing an irreplaceable role in laboratory, industrial production, and quality control scenarios.

In modern metrology systems, calibration weights are not only simple weighing tools, but also the benchmark for mass transfer. They form a bridge from national quality standards to working instruments, ensuring reliable and trustworthy measurement results in various applications from pharmaceutical production to jewelry weighing.

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The main types of calibration weights

Classified by accuracy level

1. E-grade weight: the highest precision level, used for calibrating high-precision analytical scales
2. F-grade weights: suitable for precision laboratories and metrology institutions
3. M-grade weight: Industrial grade standard, used for routine quality calibration
4. Ordinary grade weights: for general industrial use, with low precision requirements

Classified by material

1. Stainless steel weights: the most commonly used, with good corrosion resistance (304 or 316 stainless steel)
2. Brass chrome plated weights: economical choice with high surface hardness
3. Cast iron weights: commonly used materials for large mass weights (over 50kg)
4. Platinum iridium alloy weights: made of international kilogram raw materials, extremely expensive

Classify by shape

1. Cylindrical weight: commonly used in high-precision small mass weights
2. Polygonal weights: easy to grasp, mostly used for large masses
3. Sheet weight: used for combination weight groups
4. Carrying handle weights: convenient for transporting large weight weights

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Technical characteristics of calibration weights

Key manufacturing parameters

1. Density: Modern stainless steel weights typically use a standard density of 8000kg/m ³
2. Magnetic susceptibility: High precision weights require low magnetic susceptibility (<0.0005)
3. Surface roughness: E0 level can reach Ra ≤ 0.025 μ m
4. Quality tolerance: E1 grade 1kg weight tolerance is only ± 0.5mg

Surface treatment process

1. Mirror polishing: reduce adsorption effect and improve accuracy
2. Passivation treatment: enhances corrosion resistance
3. Special coating: Some weights are coated with anti pollution materials such as Teflon to prevent contamination

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Specification for the use of calibration weights

Preparation before use:

1. Check if the surface of the weight is clean
2. Use anti-static equipment to eliminate static charges
3. Maintain stable ambient temperature (recommended 20 ± 2 ℃)

Precautions for operation:

1. Special tweezers or gloves must be used for retrieval and placement
2. Handle with care to avoid collisions
3. Do not directly touch the surface of the weight with your hands

Key points of calibration procedure:

1. Follow the loading order from big to small
2. Repeat 3-5 times for each measurement point and take the average value
3. Record environmental temperature and humidity parameters

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Maintenance and Care

1. Cleaning method: Gently wipe with ethanol and ultra-fine fiber cloth
2. Storage conditions: Dedicated dryer, relative humidity ≤ 60%
3. Periodic inspection: Send for inspection every 6-24 months according to the frequency of use
4. Regular verification: Use comparison method to check the consistency between weights

Select key points

1. Matching requirements: Select the level based on the maximum weighing and accuracy requirements
2. Material consideration: 316L stainless steel is preferred for corrosive environments
3. Supporting services: Prioritize suppliers who provide regular calibration services

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• Q: Why are high-precision weights expensive? ‌
  A: High precision weights require special materials, precision machining, and strict testing. The manufacturing tolerance of E1 grade 1kg weights is only ± 0.5mg, equivalent to an accuracy of 5 parts per million, and the production cost is extremely high.
• Q: How to determine if the weight needs to be recalibrated? ‌
  A: When the following situations occur, recalibration should be carried out: exceeding the calibration period, discovering surface damage, abnormal fluctuations in measurement results, experiencing severe temperature changes or collisions.
• Q: How many weights are needed in the laboratory? ‌
  A: Suggest covering 10%, 20%, 50%, and 100% key points of the balance range, with at least 5-7 different values. For example, a 100g balance can be equipped with 10g, 20g, 50g, and 100g weights.
• Q: Can I adjust the weight mass by myself? ‌
  A: Absolutely prohibited! The adjustment of weight quality must be carried out by professional personnel using specialized equipment at the measuring institution. Any unauthorized modification will result in the certificate becoming invalid.

As the cornerstone of quality measurement, the importance of calibration weights has become increasingly prominent with the improvement of industrial precision requirements. Understanding and correctly using these precision tools is the key to ensuring the reliability of measurement results.

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