Test equipment is one of the material bases of quality testing. This paper introduces the management and maintenance of laboratory equipment from two aspects of maintenance and maintenance during the use of equipment.

The main problem

1, equipment neglect maintenance

Most chemical testing equipment are precision instruments, which not only require test operators to use, but also understand the basic principle of the instrument, the use of precautions, the storage environment of the instrument, so that the failure rate of the instrument will be reduced [1], for example, the common single yarn strength machine in textile laboratories, the universal material testing machine used for stripping and breaking tests, The mechanical part of the lead screw needs to be regularly oiler maintenance, but in actual use, often because the frequency of use is not high, neglect maintenance, there are a large number of optical instruments used UV-visible spectrophotometer belongs to optical precision instruments, optical lens positioning accuracy, storage environment to dust, shock and moisture, the requirements of the environment to maintain room temperature 15℃ ~ 35℃, no direct light, No strong vibration or continuous micro-vibration, no strong magnetic field, relative humidity 40% ~ 80%, no corrosive gases, no organic and inorganic gases causing UV absorption, less dust. If the optical instrument is stored in a general laboratory, in a humid environment, the mirror will be damp and mildew. In some laboratories, the optical analysis instrument is placed close to equipment such as centrifuges or oscillators, so that the operator can perform optical analysis of the sample after the centrifuge procedure, but the optical analysis instrument is long-term near the high-speed instrument, the lens may be shaken off or broken. In the maintenance process, it was found that there were many such problems, and the instrument management paid little attention [2], which had a great impact on the detection and test, and increased the workload of maintenance personnel and maintenance funds.

2. The instrument lacks maintenance files

After the purchase, installation and acceptance of the test instrument for normal use, the relevant materials should be classified into files and instrument files should be established. Files mainly include contracts, instructions and other technical data, equipment to arrive at the corresponding department should have the corresponding instrument use records, maintenance records, maintenance records, but sometimes the formation of "heavy purchase, light maintenance; Heavy use, light management ", not enough attention to the use of maintenance and repair records. For example, ultrasonic oscillation instruments are used more in the laboratory, and it was found in the maintenance that due to improper maintenance, the operator did not dry the spilled water or chemical drugs in time after use, corroding the circuit board of the instrument, resulting in the replacement of the entire circuit board, which extended the maintenance time, delayed the use, and increased costs. Many instruments have been repaired, because of the tight maintenance time and many tasks, they are often neglected to record the maintenance, which is not conducive to the statistical utilization rate, nor is it convenient for new maintenance personnel to query faults and replace parts, affecting the maintenance efficiency of repetitive faults or related faults.

3, the old equipment can not meet the requirements of capability verification

The competence certification program of CNAS laboratories has different projects almost every year, testing the strength of the unit through the comparison between laboratories. Under normal circumstances, large laboratory instruments are expensive, usually the key object in maintenance, so the service period is longer, so there is a problem, which can meet the requirements of inspection standards for instruments. However, for the data after the capability verification, the older equipment will usually get outlier dissatisfaction

Cause analysis

1, the user of equipment maintenance

In the maintenance of equipment, it will be found that many failures are man-made causes, and there are two reasons for the occurrence of artificial failures:

① The operator is not familiar with the operation procedures of the equipment or violates the operation procedures;

The sense of responsibility of the operator is not strong, these two situations often account for the majority of the latter, such as, when maintaining the constant temperature and humidity treatment box, it is found that some faults are because the operator is not strong in the sense of responsibility when using, is not carefully observed, and the water in the heating tank does not have a heating tube, which begins to heat, resulting in the heating tube dry burning burst or the circuit burned. Magnetic stirrers have the same problem.

2, the establishment of equipment maintenance files is particularly necessary

With the continuous increase of current testing items, the type and quantity of test equipment are increasing year by year, and the value of equipment is getting higher and higher, but because the number of equipment maintenance personnel is limited to the preparation or employment costs, it has not increased. How to get familiar with these various kinds of equipment as soon as possible, understand the principle and operation method of the equipment, and can quickly deal with various failures is the problem of each equipment maintenance personnel. Establish and improve equipment maintenance files, each equipment file, maintenance personnel according to the requirements of the maintenance application, through the archives to understand the situation of the instrument, timely deal with the fault and the cause of the fault phenomenon, treatment methods, the amount of money needed to do text file. It is convenient for laboratory administrators to check equipment usage and maintenance costs when needed. Good maintenance records and files can provide a reference for the technical transformation of instruments and the appraisal of scrap [3].

3, there is pressure for different laboratories to update equipment

Unlike scientific research and testing units, pure third-party testing laboratories often do not have the support of scientific research projects, and cannot use scientific research funds to purchase advanced testing instruments, resulting in a longer service life of large equipment, but at the same time, often capable laboratories have updated advanced equipment with higher precision, and the ability to verify whether multiple laboratory test data are discrete. Often purchased many years ago, due to the mismatch between the previous production process and the current inspection in the accuracy and accuracy of the data, it is easy to deviate a lot from the average data.

Countermeasures and suggestions

Manage the purchase of test equipment

The purchase of test equipment is a purposeful purchase according to the needs of the test, and it is not a big purchase of a lot of equipment. According to the needs of laboratory tests, on the basis of the addition of basic test equipment, carefully choose the equipment that needs to be purchased. Test equipment parameters. This is the hard indicator in the purchase - the technical parameters and accuracy of the test equipment are related to the final result of the test. During the test, if there is an accident caused by the test equipment, the test will fail.