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Type of ammonia nitrogen analyzer
Ammonia nitrogen analyzer according to the different test standards, there are A, B type. Type A is GB7479-87 by Nessler' s reagent colorimetric method. Type B adopts the national standard GB7148-81 and the salicylic acid photometric method specified in the international ISO7150/1-1948 as the basic testing method, supplemented by the sample colorimetric reaction pretreatment, to realize the rapid and accurate colorimetric determination of the sample, which has the advantages of stability, sensitivity, reliability and mercury-free.
2024-04-28
Operation steps of ammonia nitrogen analyzer
Pour distilled water or ultra-pure water into a cuvette (about 2/3 height); wipe the water marks and fingerprints on the outer wall with a non-falling paper towel or soft cloth, then put it into the measuring seat of the instrument and cover the shading cover.
The advantages of ammonia nitrogen meter
Ammonia nitrogen analyzer adopts the national standard: salicylic acid colorimetric method to complete the measurement of ammonia nitrogen in water quality, and adopts the sodium dichloroisotricyanate regulated by the international standard to replace the commonly used sodium hypochlorite, so that the stability and effectiveness of the reagent solution containing chlorine are greatly enhanced (type B).
Basic introduction of pipe bender
Pipe bender can be roughly divided into CNC pipe bender, hydraulic pipe bender and so on. Mainly used for electric power construction, public railway construction, boilers, bridges, ships, furniture, decoration and other aspects of pipeline laying and repair, with many functions, reasonable structure, simple operation and other advantages. In addition to the pipe bending function, this machine can also use the cylinder as a hydraulic jack. Compared with the numerical control pipe bending equipment, it has the characteristics of low price and convenient use, and occupies the leading product position in the domestic pipe bending machine market.
Main features of pipe bender
The pipe bender performs the bending of the pipe as well as the bending of the sheet. In the case of pure bending, when the pipe with outer diameter d and wall thickness t is bent under the action of external moment m, the pipe wall outside the neutral layer is subjected to tensile stress σ1 and the pipe wall becomes thinner. The inner pipe wall of the neutral layer is thickened by the compressive stress σ1. Moreover, the shape of the cross section changes from circular to approximately elliptical due to the combined forces F1 and F2. When the deformation is too large, the outer tube wall will crack and the inner tube wall will wrinkle.
Basic introduction of bending machine
The bending machine is a machine that can bend thin plates. Its structure mainly includes a bracket, a workbench and a clamping plate. The workbench is placed on the bracket. The workbench is composed of a base and a pressing plate. The base is connected to the clamping plate through a hinge. The base is composed of a seat shell, a coil and a cover plate. The coil is placed in the depression of the seat shell, and the top of the depression is covered with a cover plate. When in use, the coil is energized by the wire, and the pressure plate is energized to generate attractive force, so as to realize the clamping of the thin plate between the pressure plate and the base. Due to the use of electromagnetic force clamping, the pressure plate can be made into a variety of workpiece requirements, and can be processed on the side wall of the workpiece, the operation is also very simple.
Specializing in the design and production of household air conditioners, commercial air conditioners, room air conditioners
