What the laboratory should consider when purchasing equipment

First, the future benefits This issue should be considered first from the perspective of economic efficiency, and it is the most important issue in project selection and instrumentation. Under the conditions of market economy, how to make the investment into output quickly, how long it will take back the investment in the future, and how long it will be profitable is very realistic. Therefore, it is very necessary to conduct detailed market research on the existing market.
Second, the performance price is relatively simpler than this problem. Generally, after purchasing the equipment, it is easy to get a comparison of various aspects of the same or similar technical indicators. However, it is necessary to put special emphasis on two points. First, the publicity materials of products are treated in a dialectical manner. At present, suppliers are mixed, and some manufacturers will promote their product performance indicators too high. Sometimes they will only give short-term indicators or give optimal indicators, or Good measurement uncertainty is given without long-term verification, but its confidence level is low. Second, under similar conditions, try to buy products with perfect after-sales service and more mature companies, because whether the company exists in the market in the next few years, can you provide quality after-sales service, can provide The expansion and upgrading of the technology development is very important. Therefore, the performance price ratio must be compared with multiple qualified suppliers.
Third, the instrument reliability Modern equipment (not just electronic equipment) Most use the microcomputer technology to provide a smart and friendly interface, which means that a large number of electronic components, large-scale ultra-large-scale integrated chips, relays, stepping The connection between the motor and the mechanical equipment. We know that the more components and modules, the lower the reliability of the whole instrument and the higher the failure rate. Good products should be designed with reliability, and use high-quality, long-life and age-forming devices as much as possible. The instrument also preferably has automatic protection functions (such as overload protection). At the same time, the instrument should pass the perfect reliability test before leaving the factory, mainly through strict environmental stress test. Especially for the product, the most effective environmental stress test is: random Vibration, sweep vibration, salt spray test and temperature cycle. It is understood that some foreign manufacturers produce a random vibration test of 2g (gravity acceleration) or more for each instrument produced by the manufacturer. In the frequency sweep test, according to the actual resonance point of the equipment, the corresponding vibration test is added according to different use requirements. Through the above rigorous tests, failures caused by potential manufacturing defects can be avoided. Therefore, operators using such equipment can safely move and perform on-site calibration. Users do not have to constantly doubt the data of the equipment and reduce the work efficiency. For the above reasons, when purchasing large-scale instruments and equipment, in the case of conditions, the supplier should conduct a second-party assessment in the field, through field inspection of the manufacturer's design, production, storage and transportation, and factory inspection, especially the reliability of the instrument. To understand (such as asking whether to carry out reliability design and testing and management, and whether to provide indicators such as the average time to failure of the equipment), it will have a multiplier effect on the purchase of equipment.
4. The use environment mainly refers to the environmental conditions required for existing laboratories to provide newly purchased instruments and equipment. Because it only fully meets the space, temperature, relative humidity, proper power source, ventilation, lighting, etc. required by the equipment, and eliminates harmful electric and magnetic field interference, control the number of dust particles and reduce vibration and other interference factors, the instrument In order to meet the expected technical specifications, the equipment should be inquired in detail about the manufacturer's requirements for the use of the equipment and equipment. If the existing laboratory cannot provide the necessary environmental conditions, the laboratory must be modified in advance. In particular, it is the guarantee of the space occupied by the equipment and the installation and commissioning: if the newly purchased equipment can easily enter and exit the laboratory aisle, the ground bearing capacity of the laboratory should be greater than the weight of the large equipment and equipment. And whether the placement can meet the requirements of ergonomics (to make the instrument and the daily user to achieve the best efficiency) and whether the power distribution capacity of the power supply is sufficient.
V. In-use cost This is the most easily overlooked before purchasing equipment, and some costs are invisible. This will be related to the normal operation of the equipment and the reasonable deployment of the workload, mainly including personnel training and general maintenance equipment. Normal operation, such as instrument depreciation expense, cycle traceability cost (including traceability frequency and its cost, transportation cost and the cost of stopping work due to the time required for traceability), future expansion and upgrade of equipment and equipment, maintenance costs (including traceability The cost of stopping work for the time required) and the cost of providing maintenance to meet the daily use environment of the equipment, the above costs may be considerable, and even the cost of use is several times the price of the equipment, so it should be given special consideration.

The above only considers several common aspects, and there may be some aspects to be considered in practice. In short, in order to minimize the risk of purchasing the wrong equipment and equipment, so that the purchased equipment can achieve the desired results, all inputs and benefits (including feasibility and necessity) must be comprehensive and sufficient before purchasing the equipment. Scientific considerations are likely to achieve the best results.

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