Basic requirements for instrument calibration

1. The balance must be maintained and certified by the metrology department at least once a year in accordance with national standards. All maintenance and calibration should be recorded for inspection. 2. The ultra-clean table is maintained once a year by a nationally recognized organization, including checking the integrity of the filter membrane, the air circulation, the size of the filtered air and the effective radiation of the UV lamp. After passing the inspection, the inspection agency 1. The balance must be maintained and certified by the metrology department at least once a year in accordance with national standards. All maintenance and calibration should be recorded for inspection. 2. The ultra-clean table is maintained once a year by a nationally recognized organization, including checking the integrity of the filter membrane, the air circulation, the size of the filtered air and the effective radiation of the UV lamp. After the inspection is qualified, the inspection agency shall issue a certificate of conformity and affix a label on the qualified ultra-clean table with the date of inspection. When the effective radiation of the ultraviolet lamp tube drops by 20%, it should be replaced. 3. Thermometer At least one thermometer certified by the metrology department according to national standards should be kept as a reference thermometer. The freezing point of the reference thermometer shall be re-certified by the metrology department every ten years. Refer to the freezing point of the thermometer to be checked once a year. All working thermometers should be calibrated with the reference thermometer once a year, and the working temperature is generally calibrated. Each laboratory should indicate the allowable error range of the laboratory's thermometer. The tested thermometer should be marked. The laboratory shall keep the detection methods and labeling methods of thermometers. For thermometers with particularly strict requirements, the specific operating temperature should be tested twice a year. 4. Water bath When using a water bath, use a calibrated thermometer to check at different points in the water bath. To ensure the consistency of the overall temperature. All inspections and tests should be recorded. 5. Thermostats, refrigerators, freezers 5.1 Thermostats Each thermostat shall be marked with the allowable temperature range of use. Use a calibrated thermometer to check the incubator with one of the following methods every day: check the readings of the incubator thermometer before opening the incubator door every morning; use the highest and lowest thermometers to record night temperature changes; use a continuous temperature recorder to record. The recorder is tested with a reference thermometer at least once a year. 5.2 CO2 incubator Check and record the CO2 readings every day. Use a barometer to check the electronic reading meter every month. The inspection results should be recorded and kept for at least two months. 5.3 Refrigerators and freezers are the same as incubators. To facilitate reading, put the thermometer in water or oil before putting it in the refrigerator or freezer. 5.4 Ultra-low temperature freezer The temperature alarm system is checked every six months. Check and record the temperature every day and keep the records for at least two months. The conditions outside the temperature range and the measures taken should be recorded and signed. 6. The sampler is cleaned and tested once a year. The method to check the accuracy of the sampler is: the non-adjustable sampler, suck water five times in a row, and weigh them on the balance; for the adjustable sampler, the maximum, minimum, and intermediate aspirations of the sampler are continuous respectively. Pipette the water five times, and then weigh them separately. The average volume calculated by the weight of the water weighed five times is compared with the reading of the sampler, and the error is within 3%. If it exceeds this range, it should be cleaned, repaired and recalibrated. If re-calibration is still unqualified, it shall be returned to the manufacturer for repair or disposal. The allowable variation range between the volume of five consecutive water absorptions shall be defined by the standard deviation or the maximum range. If it exceeds this range, it shall be cleaned, repaired or recalibrated. If re-calibration is still unqualified, it shall be returned to the manufacturer for repair or disposal. 7. Centrifuge Ordinary centrifuge for general purpose, as long as it works normally, it does not need to be corrected. High-speed and ultra-speed centrifuges are repaired and maintained by a nationally recognized organization once a year. Use should be operated by a dedicated person, and register and sign after each use. There should be a certificate of conformity after maintenance. 8. Each time the autoclave is autoclaved, temperature indicator strips should be placed in the densest part of the middle of the autoclave. The used temperature indicator strips should be signed and dated, and kept for at least six months. The safety inspection of the high-pressure steam sterilizer is carried out by a nationally recognized institution every year and a certificate of conformity is issued.