In Europe, there are three agencies that can represent standards on behalf of the European Commission: c en (European Committee for Standardization), c en elec (European Commission for Electric Engineering), etsi (European Telecommunications Standards Institute) Work with the other two agencies to develop the necessary standards. In the European Machinery Directive, which contains hundreds of standards, Eurostat divides them into three distinct hierarchies for better management and compilation of these standards: Category a (Basic), Category b (Category Standard) and c standard (product standards). The standard of type a is the basic standard that all machines must meet. Under the a standard is a reference to a standard developed class b standard for the provisions of various types of machines, b standard is not for a specific type of machine, but the common category of machines Made a provision. On the basis of the b standard, a large number of c standards have been developed, each of which has a detailed specification for a specific machine. In addition, the b standard is divided into b1 standard and b2 standard. The b1 standard specifies the parameters related to safety protection such as safety spacing, surface temperature, noise, etc .; b2 standard specifies the specific requirements of the safety protection device, Such as hands button, safety door switch, safety carpets and so on. All of these European standards (en standards) are unmodified in their national standards (eg the d in standard and the vde code in Germany). These common standards in various European countries can guide manufacturers how to get their products ce mark, and if manufacturers meet the requirements of these standards can be considered to meet the requirements of the European Directive. The following is a part of the European standards that have been officially implemented and pre-implemented. European Standard (Basic Criteria and Classifications): en 292 Part 1 Safety of Machinery - Basic Concepts and General Principles for Basic Terms and Methods en 292 Part 2 Safety of Machinery - Basic Concepts and Principles of Design Principles and Specifications General en 29 Safety of machinery - Safety distances to prevent upper limbs from reaching hazardous areas en 349 Safety of machinery - Minimal clearance to avoid personal injury from crush en 418 Safety of machinery - Emergency stop equipment and functions Design Principles p ren 574 (Draft) Machine Safety - Two-Hand Controls p ren 811 (Draft) Machine Safety - Safety Distances to Prevent Lower Extremities from Reaching the Hazard Zone p ren 953 (Draft) Machine Safety --- General requirements for the design and construction of stationary and mobile safety doors p 954-1 (Draft) Safety of machinery - Components related to safety functions in control systems, Part 1: Design General en 1037 Machines Safety --- to prevent the accidental start of the machine p ren 1050 (draft) the safety of the machine --- risk analysis en 1088 Safety of machinery --- Safety door-related safety door switching device design and selection principles en 60204 Part 1 Safety of machinery --- General requirements for electrical parts of the machine European Standard (product standard): en 201 Safety of machinery - - Technical and safety requirements for the design and construction of injection molding machines for the plastics and rubber industry p ren 280 Safety of machines --- Mobile lifting platforms, design calculations, structural and safety tests for stability parameters p ren 415 (Draft ) Safety of machinery --- Safety requirements of packaging machinery, molding machinery, etc. en 500-1 Safety of machinery --- Safety of mobile construction machinery p ren 691 (Draft) Safety of machinery --- Woodworking Machinery, Health And Safety General Requirements p ren 692 (Draft) Safety of Machinery - Safety of Mechanical Machinery p ren 693 (Draft) Safety of Machinery - Safety of Hydraulic Machinery en 775 Safety of Machinery - Safety of Industrial Robots Safety of Machines - Safety Requirements for Metal Die Casting Equipment p ren 869 (Draft) Safety of machinery --- Technical requirements for the design and construction of printing machinery and equipment safety p ren 11111 (Draft) Safety of machinery - Safety requirements for textile machinery
Centrifuge Tube Rack
At present, in the process of isolation and preparation of various stem cells from various tissue sources, Centrifuge Tubes with a volume of 15ml and 50ml are used.
It is one of the low-value consumables with high usage rate. It is generally installed on a dry foam rack with the package or in bulk. When used, it is taken out by the operator and placed on the plastic centrifuge tube rack in the ultra-clean workbench. The common centrifuge tube rack can only make the centrifuge tube stand upright. When transferring liquid or needing centrifugation, the operator should hold the centrifuge tube in the left and the night gun or aspirator in the right. If it is necessary to transfer a large amount of liquid reagents or perform gradient centrifugation operations, such as density gradient centrifugation to separate mononuclear cells, the operator needs to hold the centrifuge tube with the right hand for a long time and tilt the centrifuge tube, which often causes the operator's wrist joint pain. At the same time, it will also affect the liquid superposition effect, which will easily lead to the mixing of liquids of different densities, resulting in the failure of the experiment.
centrifuge tube rack bulk,tube rack for centrifuge,rack for centrifuge tube
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