The management of reference materials in a temperature calibration laboratory is an important aspect to ensure calibration accuracy and traceability.
Firstly, when purchasing reference materials, suppliers with good reputations and qualifications should be selected. Ensure that the purchased reference materials meet relevant international or national standards. For example, the standard platinum resistance thermometer purchased for calibrating thermometers should meet the requirements of the ITS-90 temperature scale. During the purchasing process, detailed records of the specifications, models, batches, production dates, expiration dates, etc. of the reference materials should be kept for traceability and management.
The storage conditions of reference materials are crucial. Different reference materials have different storage requirements. Generally, they should be stored in an environment with relatively stable temperature and humidity, without direct strong light irradiation and strong magnetic field interference. For example, some high-precision temperature reference materials should be stored in a special constant temperature and humidity cabinet, with the temperature controlled within a specific range, such as 20°C ± 2°C, and the relative humidity controlled within 40% - 60%. At the same time, the storage environment should be regularly monitored and recorded to ensure that the environmental conditions always meet the requirements.
When using reference materials, the operating procedures should be strictly followed. Operators should receive professional training and be familiar with the usage methods and precautions of reference materials. Each use should record the amount used, the time of use, the user, etc. to avoid waste and misuse of reference materials. For reference materials with usage frequency limitations or expiration date limitations, the remaining usage frequency or remaining expiration date should be tracked in a timely manner. When approaching the limitations, they should be used carefully or replaced in a timely manner.
In addition, interim checks of reference materials should be carried out regularly. By comparing with a higher-level reference material or other reliable measurement methods, verify whether the quantity value of the reference material is accurate and reliable. If a deviation in the quantity value of the reference material is found, the cause should be analyzed in a timely manner and corresponding corrective measures should be taken, such as recalibrating or replacing the reference material, to ensure the accuracy and effectiveness of the calibration work.
