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Technical requirements for heavy metal zinc automatic online monitor

by:BOQU     2023-03-15
Most of the heavy metal zinc in surface water comes from industrial wastewater from mining, smelting, galvanizing and other industries. Generally, low-level zinc ions are less toxic. When zinc ions are enriched in soil or water, they will cause biological damage. harm. At present, there are many kinds of detection instruments for heavy metal zinc in water, such as laboratory desktop, portable and real-time online monitoring. But no matter which detection method you choose, you must first know the performance and technical requirements of the heavy metal zinc. With this information, you can quickly choose the equipment that suits you. Generally, the technical requirements of heavy metal zinc automatic on-line monitors are mainly divided into three aspects: basic equipment requirements, performance requirements, and safety requirements. Technical requirements for heavy metal zinc automatic on-line monitor Basic requirements for the instrument 1. The display of the instrument should be free from stains and damage. All display interfaces should be in Chinese, with uniform and clear characters, no vignetting, black spots, rainbows, bubbles, flickering, etc., and the prompts on the display can be used for full-program operation, which is convenient for users to quickly familiarize themselves with the operation process of the instrument. 2. The casing of the instrument should be made of corrosion-resistant materials, with no cracks, deformation, dirt, burrs, etc. on the surface, and the surface coating should be uniform without corrosion, rust, peeling and wear. 3. The assembly of the product parts inside the instrument should be firm, the parts should not be loose, and the buttons, switches, door locks and other components should be flexible and reliable. The main components should have corresponding logos and text descriptions, and the analysis flow diagram should be marked in a conspicuous position of the instrument. 4. The instrument enclosure should meet the requirements of the specified I protection class. Performance requirements of the instrument 1. The sampling/metering unit should be made of materials with poor anti-corrosion and adsorption properties, and the measurement results will not be affected by the corrosion and adsorption of reagents or samples. The metering part should ensure the accuracy of water samples, standard solutions, reagents, etc. 2. The digestion unit should adopt high temperature, high pressure, ultraviolet and other digestion methods, which can convert all zinc and its compounds in water samples into zinc ions. Corrosion-resistant and high-temperature-resistant materials should be used, and they should be easy to clean. It should have an automatic heating device and a temperature sensor, which can set the digestion time and temperature. It should have a cooling device and a safety protection device that can maintain constant temperature and pressure. 3. The reaction module of the analysis unit should be constructed of anti-corrosion materials and easy to clean. The output signal of the detection module should be stable. 4. The control unit should have the feedback function of abnormal information recording (over-range alarm, lack of reagent alarm, component failure alarm and over-standard alarm, etc.), and it is advisable to use sound and light to alarm. There should be manual and automatic cleaning functions for the sampling metering, digestion and analysis units. If there is an unexpected power failure during use and the power is turned on again, the instrument can automatically discharge the substances and reagents being measured before the power failure, automatically clean each channel and reset to the state of restarting the test. If it was in the state of heating and digestion before power off, it can automatically cool down after power on again, and reset to the state of restarting the test. The data processing system should have the functions of data and operation log collection, storage, processing, display and output, and should be able to store at least 12 months of raw data and operation logs, and can set conditions to query and display historical data. The unit of instrument data is mg/L, and at least two significant figures are reserved after the decimal point. It should have the functions of automatic standard sample verification and automatic calibration, and record the results in the operation log. It should have the function of automatic switching between high and low ranges, and the normal display of monitoring data and normal output of signals will not be affected when the range is switched. It shall have a digital communication interface, output relevant data and operation logs through the digital communication interface, and receive external remote control instructions. Safety requirements of the instrument 1. The external structure of the instrument should comply with the relevant regulations, and the insulation resistance between the power lead-in line and the casing should not be less than 20MΩ. 2. The connection between the power lead-in wire and the case of the instrument can withstand 50 Hz, 1.5 kV AC RMS continuous voltage test for 1 minute, with a current limit of 5 mA, without arcing or breakdown. 3. The leakage current of the instrument is not greater than 5 mA. 4. Leakage protection devices and overload protection devices should be provided to prevent personal electric shock and accidental burning of instruments. 5. The labeling of the instrument should comply with the relevant regulations, and the dangerous parts such as high temperature, high pressure, corrosion, poisonous and harmful should have warning signs. 6. Should have a good grounding port. The above are the technical requirements of the heavy metal zinc automatic online monitor. You can refer to these conditions when producing and selecting.
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