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1. The simplest three steps for trading orifice plate differential pressure flowmeter are: obtaining supplier qualifications, completing product compliance certification, signing contracts, and arranging logistics. 1. Supplier qualification confirmation: Contact the manufacturers of Jilenchang orifice flow meters (such as Xian Automation Instrument Factory and Chongqing Chuanyi) to obtain a business license, medical device registration certificate (if used for medical purposes), and manufacturing measuring instrument license. It is necessary to verify whether the manufacturer complies with the GB/T 2624-2006 standard and ISO 9001 quality system. 2. Product compliance certification requires the supplier to provide a factory inspection certificate and a third-party calibration report (such as issued by the China Institute of Testing and Technology) to ensure that the accuracy level of the flowmeter (commonly 0.5 or 1.0) meets the contract requirements. If export requires CE certification (EU) or API certification (petroleum industry)
3. When signing the contract with logistics, clearly define the measurement performance parameters (range ratio, repeatability error), material requirements (commonly used 316 stainless steel for orifice plates), and after-sales service terms. Logistics should use shockproof packaging and check the consistency between the shipping list and the ordered model before shipment. Attention: Be cautious of suppliers without production licenses for measuring instruments in trade, and avoid purchasing products that do not comply with GB/T 2624 standards. If it involves steam flow measurement, an additional temperature and pressure compensation scheme is required.
2. What are the types
There are many types of liquid flow meters, and common liquid flow meters include vortex flow meters, Hui Si turbine flow meters, differential pressure flow meters, electromagnetic flow meters, metal tube rotor flow meters, etc.
3. Precautions for installing differential pressure orifice flow meters
The correct installation of differential pressure orifice flow meters directly affects their accuracy in measurement.
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1、 The usage conditions of standard throttling devices include: ① The fluid must fill the circular tube and continuously flow through the throttling device; ② The fluid must be a homogeneous single-phase fluid both physically and thermodynamically; ③ No phase change shall occur when the fluid flows through the throttling device; ④ The fluid measured by the throttling device must be a steady flow, or can be regarded as a steady slow changing fluid, and is not suitable for pulsating flow and critical flow measurement; ⑤ The stream must be parallel to the pipeline and there must be no rotating flow.
2、 Basic installation requirements: ① The verticality of the upstream end face of the throttle element and the pipeline axis should not exceed 1 °. ② Throttling components with different axial degrees should be coaxial with the pipeline. When the distance between the axis of the throttle element and the axis of the upstream and downstream pipelines satisfies the following equation, the outflow coefficient C has no additional uncertainty: еx=(0.0025D)/(0.1+2.3 β 4). When the above equation cannot be satisfied, and the following equation is satisfied, the uncertainty of the outflow coefficient C should be arithmetic added up ± 0.3%: (0.0025D)/(0.1+2.3
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