1.1 "Weighing" during processing is a key process that directly affects product quality. Electronic scales as weighing tools must be incorporated into controlled management. Therefore, electronic scales must be carried out by a person to carry out the calibration test of the working status every month, and once a year should be sent to a specialized inspection agency for verification. 2 scale management procedures 3 Management procedures for electronic analytical balances 4 thermometer management procedures 5 Calibration marks Description Electronic scales and scales for weighing must be affixed with a valid "calibration device calibration label", otherwise they are not allowed.
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1.2 Test methods
1.2.1 Calibration Firstly, make the electronic scale empty, turn on the power of the electronic scale, observe whether the indication reading on the display returns to zero, and then add the standard yardage of the corresponding scale on the electronic scale to observe the electronic scale display. Whether the reading on the display is the quality value of the standard weight, if the reading is the quality value of the standard weight, it is qualified, otherwise it is unqualified.
1.2.2 Checking the Charging Condition Turn on the electronic scale power supply and observe the electronic scale power indicator light. If the “red light†or “blinking battery†mark is on, it indicates that the power level is insufficient. It is necessary to recharge or replace the battery in time; †It means that the power is sufficient and the status is normal. Insufficient power for the test is not qualified, it is strictly prohibited to put into use.
1.2.3 Qualification and Non-conformity Judgment Only the electric quantity is sufficient and the calibrated electronic scale can be used. If there are other faults, you must apply for maintenance in time. A faulty electronic scale should have a "disabled" symbol.
1.3 Storage: After the daily use of the electronic scale, the surface of the water and dirt should be wiped, placed in a dry, clean place for safekeeping.
2.1 The scales must be calibrated and tested by a person at work every month, and once a year, they should be sent to a specialized agency for periodical verification;
2.2 Before weighing, check whether the scale is in normal condition.
2.3 Weighing must be accurate, fair, and fair. Digital records must be correct and clearly written;
3.1 In order to ensure the accuracy of various inspection data, the electronic analytical balance must be calibrated by a person to verify the working status every month, and once a year, it should be sent to a specialized inspection agency for verification.
3.2 Test methods
3.2.1 Correction
3.2.1.1 Open the electronic analytical balance, press the CAL key when the display appears 0.0000g, the calibration program is started to execute, and the quality value g of the calibration weight is displayed on the display, if an error occurs when starting the calibration program or In case of a malfunction, "Err02" is displayed on the screen. In this case, you must repeat the clear operation and press the CAL key when the display shows 0.0000g.
3.2.1.2 The 200g calibration weight is placed in the middle of the weighing pan. The electronic analytical balance automatically performs the calibration process. When the screen displays the quality value g of the calibration weight, and the displayed value is stationary, the calibration process is completed. .
3.2.1.3 If the deviation greatly exceeds the repeatability (the standard deviation is that the same object is weighed six times in succession and the result of selecting the maximum minus the minimum divided by 3) is ≤±0.1 mg, the electronic balance must be calibrated.
3.2.2 Keeping
3.2.2.1 Daily Electroanalytical Balance After the balance is used, the surface dirt should be wiped dry and placed in a dry, clean place.
3.2.2.2 Electronic analytical balances are precision instruments. To ensure the accuracy of the weighing data, they should be placed in specific areas and must not be easily moved.
4.1 Thermometers include thorn thermometers, infrared thermometers, thermometers, and glass thermometers.
4.2 The thermometer shall be calibrated by a person to check the work status every month, and the standard thermometer and standard thermometer and hygrometer should be sent to a special organization for verification once a year.
4.3 Correction
4.3.1 Place the thermometer to be calibrated and the certified standard thermometer and standard hygrometer at the same measurement point and compare the measured temperature values.
4.3.2 Compare the two values ​​and correct accordingly the deviation.
4.4 The storage glass thermometer and hygrometer are organic liquid columns, so they should be placed in an upright position, and should not be inverted to prevent the organic liquid column from being disconnected, which will affect the accuracy of the data.