Evaluation criteria for electromagnetic flowmeter products

1. General Principles In order to ensure the reliable application of electromagnetic flowmeters in the urban water supply industry, promote the development of electromagnetic flowmeter technology, and enable manufacturers to achieve target production standards, thereby making urban water supply metering more standardized and achieving good results. Benefits, the industry's "Electromagnetic Flowmeter Product Selection Standards" (hereinafter referred to as: this evaluation standard) are specially formulated. 2. Basic project components of the selection standard. The cost evaluation standard mainly consists of four parts, namely: 2. 1. Manufacturer You must first obtain the qualifications to participate in the evaluation. For details of the qualifications that must be met, please refer to "4" Item 2.2 Basic parameters, performance, functions, inspection and testing of electromagnetic flowmeters 2.3 The manufacturer's comprehensive management level: quality system compliance inspection items and scores 2 and 4. Water flow standard equipment - that is, the ability and level of electromagnetic flowmeters to perform water flow verification

In order to make the evaluation more specific, more practical and concisely operable, this evaluation The excellent standards refine the above four basic projects into a number of sub-projects.

3. Importance classification of sub-projects and evaluation and judgment rules 3. 1. Importance classification of sub-projects. This evaluation standard divides the sub-projects that must be inspected and selected into three categories according to their importance, respectively. Category A: very important projects: projects with veto power. Those who fail to qualify for one item will not be allowed to participate in the evaluation. Category B: Generally important projects: Projects are more valued, but those who are unqualified in three or more (excluding three) items will not be allowed to participate in the evaluation. Category C: General projects: Failure of this type of project will not affect the evaluation, but it must be improved within a time limit or proven to meet practical requirements.

4. Qualifications and classifications 4.1 Must have a valid business license issued by the industrial and commercial administration department. Category A 4 and 2 must have a valid measuring instrument manufacturing license issued by the quality and technical supervision department. Class A 4 and 3 have a full range of electromagnetic flowmeter (DN15~3000) manufacturing and water flow verification equipment that can meet the needs of the urban water supply industry. Class A 4 and 4 electromagnetic flowmeters must comply with both standards ISO13359~1996 and mechanical industry standards JB/T9248~1999. Category A

4.5 Reasonable and effective production organization and management system, complete inspection and testing methods. Category B 5. Basic parameters, performance, functions, inspection items and classification of electromagnetic flowmeters (according to JB/T9248-1999 and ISO13359-1996) 5. 1 Caliber series completeness: DN15~DN3000, a total of at least 30 specifications Category A 5.2 Working pressure: 0.6Mpa, 1.0Mpa, 1.6Mpa, 4.0Mpa Class C 5.3 Medium temperature: Depending on the lining material, the maximum medium temperature is 70℃~150℃ Ambient temperature: Sensor -25℃~+60℃ The converter and integrated type are -10℃~+60℃ Class C

5, 4 degrees: ±0.5% (F.R) Class A 5, 5 Upper limit flow velocity value range: 0.5~15m/s Class A 5, 6 Structure type: split type, integrated type C Class 5, 7 Explosion-proof requirements: mdⅡBT4 sensor protection level: IP68, IP65 Class A

5, 8 Converter functions: full digital display, on-site or remote programming according to the menu Class A 5, 9 Bus and network functions: HART protocol, RS232, RS485 interface Class A 5, 10 Power supply: AC: 85~265V DC: +24V or battery Category B 5, 11 Lining material, electrode material, protective flange, long-distance transmission cable optional Category B 5, 12 Installation opening length and size: in line with ISO13359~1996 Category A 6. Quality system compliance inspection items and classification 6.1 The inspection of quality system compliance items will be carried out in accordance with the quality system details established by different manufacturers and according to the specific requirements of electromagnetic flowmeters. 6.2 The inspection of quality system compliance items shall be evaluated item by item according to the items listed in Table 1. 6.3 In the quality system compliance, those who pass the inspection items that are deemed to meet the requirements are recorded as "qualified", and those who are deemed to not meet the requirements for the inspection items are recorded as "qualified". "Unqualified" 6, 4 After inspection, it is concluded that it is qualified or unqualified 6, 5 The quality system inspection items, evaluation methods, and judgment conclusions are shown in Appendix 7. Water flow standard equipment - that is, real flow verification of electromagnetic flowmeters Ability and level 7.1 Establish water flow standard equipment that is suitable for the electromagnetic flowmeter produced, and there is no need to outsource calibration to Category A 7.2 Establishing these equipment is for the development, development, improvement and reproduction of electromagnetic flowmeters for users. The school provides conditions for Category A