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涡街流量计用于测量满管状态下的气体、蒸汽和液体，测量是基于卡门旋涡原理。当介质以一定速度流过三角柱时，在三角柱体两侧后面产生一个交替排列的旋涡带，称之为"卡门旋涡"，由于旋涡发生体两侧交替产生旋涡，于是在发生体两侧产生压力脉动，从而使检测体产生交变应力，封装在检测探头体内的压电元件在交变压力的作用下，产生与旋涡同频率的交变电荷信号，经前放大器放大，送至智能流量计算仪进行智能化处理，实现流体瞬时流量、累积流量的显示及流量数据与微机系统的通讯和控制。
The vortex flowmeter is used to measure gas, steam and liquid in a full pipe state, and the measurement is based on the Karman vortex principle. When the medium flows through the triangular column at a certain velocity, an alternately arranged vortex belt is generated behind both sides of the triangular column, which is called "Karman vortex". Since vortices are alternately generated on both sides of the vortex generator, pressure pulsations are generated on both sides of the generator, so that alternating stress is generated in the test object. The piezoelectric elements encapsulated in the test probe are under the action of alternating pressure. The alternating charge signal with the same frequency as the vortex is generated, amplified by the pre-amplifier, and sent to the intelligent flow calculator for intelligent processing, so as to realize the display of instantaneous flow and cumulative flow of fluid and the communication and control of flow data with the microcomputer system.
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概述
Overview
涡街流量计用于测量满管状态下的气体、蒸汽和液体，测量是基于卡门旋涡原理。当介质以一定速度流过三角柱时，在三角柱体两侧后面产生一个交替排列的旋涡带，称之为"卡门旋涡"，由于旋涡发生体两侧交替产生旋涡，于是在发生体两侧产生压力脉动，从而使检测体产生交变应力，封装在检测探头体内的压电元件在交变压力的作用下，产生与旋涡同频率的交变电荷信号，经前放大器放大，送至智能流量计算仪进行智能化处理，实现流体瞬时流量、累积流量的显示及流量数据与微机系统的通讯和控制。The vortex flowmeter is used to measure gas, steam and liquid in a full pipe state, and the measurement is based on the Karman vortex principle. When the medium flows through the triangular column at a certain velocity, an alternately arranged vortex belt is generated behind both sides of the triangular column, which is called "Karman vortex". Since vortices are alternately generated on both sides of the vortex generator, pressure pulsations are generated on both sides of the generator, so that alternating stress is generated in the test object. The piezoelectric elements encapsulated in the test probe are under the action of alternating pressure. The alternating charge signal with the same frequency as the vortex is generated, amplified by the pre-amplifier, and sent to the intelligent flow calculator for intelligent processing, so as to realize the display of instantaneous flow and cumulative flow of fluid and the communication and control of flow data with the microcomputer system.
在一定雷诺数范围内(2×10^4~7×10^6)旋涡的释放频率f与流体速度V及旋涡发生体的迎流面宽度d之间关系，可用下式表示：
In a certain Reynolds number range (2×10^4~7×10^6), the relationship between the release frequency f of the vortex and the fluid velocity V and the width d of the flow-facing surface of the vortex generator can be expressed by the following formula:
式中f-卡门旋涡的释放频率，Sr-系数(称为斯特劳数)，V-流速，d-三角柱的宽度。斯特劳哈尔数是涡街流量计的重要系数。在曲数的Sr=0.16的平直部分，所以只要准确测出频率f，就可用测出流体流速V=f•d/Sr，从而达到测量管道内流体流量的目的；
Where f-the release frequency of Karman vortex, Sr-the coefficient (known as the Strouhal number), V-the flow velocity, and d-the width of the triangular column. Strouhal number is an important coefficient of vortex flowmeter. In the straight part of the curvature number Sr=0.16, the fluid velocity V=f•d/Sr can be measured so as long as the frequency f is accurately measured, thus achieving the purpose of measuring the fluid flow in the pipeline;
即：Q=3600×f/k······ (1) (K-仪表系数，次/m3)
That is, Q=3600×f/k... (1) (K-instrument coefficient, times/m3)
流动方向 Flow direction
旋涡 Vortex
斯特劳哈尔数 Strouhal number
测量可能范围 Possible measuring range
正常测量范围 Normal measuring range
雷诺数 Reynolds number
显示界面
1.这五位数字有几种含义：
1.The five digits have several meanings:
1.1左边显示Q,表示瞬时流量
1.1Q is displayed on the left, indicating instantaneous flow
1.2左边显示P,表示管道气体压力
1.2P is displayed on the left, indicating the pipeline gas pressure.
1.3右边显示mA,表示电流
1.3mA is displayed on the right, indicating the current
1.4右边显示%,表示百分比
1.4% is displayed on the right, indicating the percentage
1.5"7"中无单位显示，"1"中五位数字表示涡街信号频率
1.5There is no unit display in "7", and the five digits in "1" indicate the vortex signal frequency
1.6同时显示PQ,"1"中五位数字表示涡街信号频率表示仪表系数修正前的频率值
1.6PQ is displayed at the same time. The five digits in "1" represent the vortex signal frequency, indicating the frequency value before the correction of instrument coefficient
2.瞬时流量强度条，满量程一共20个小格，每个小格代表满量程流量的5%。
2.Instantaneous flow intensity bar, with a total of 20 cells in full scale, and each cell represents 5% of the full-scale flow.
3.DNXXX表示被测量管道管径，在菜单选择时用作菜单的编码显示。
3.DNXXX represents the diameter of the measured pipeline, which is used as the code display of the menu during menu selection.
4.这六位数字有几种含义：
4.The six digits have several meanings:
4.1左边的Total,表示累积流量
4.1Total on the left represents the cumulative flow
4.2左边的T,表示管道气体温度
4.2T on the left represents the gas temperature of the pipe
5.表示累积流量单位：
5.For the cumulative flow unit:
ft:立方英尺（体积） t:吨（质量） kg:千克（质量）
ft:cubic feet (volume) t: tons (mass) kg: kilograms (mass)
NL:标准升（体积）(Normal Liters)
NL:normal liters (volume)
L:升（体积） m3:立方米（体积）
L:liters (volume) m3: cubic meters (volume)
x1000:累积流量读数乘以1000是真实累积流量
x1000: Cumulative flow reading multiplied by 1000 is true cumulative flow
6.密码锁定状态显示和电池电量状态（电池供电型）。
6.Password lock state display and battery power state (battery powered type).
7.表示瞬时流量单位，前边的字母是流量单位，后面的h， s，min，d是时间。
7.For the instantaneous flow unit, the letter in front is the flow unit, and the h, s, min and d in the back are the time.
流量和时间有多种组合，仅介绍最常用的组合：
There are several combinations of flow and time, and only the most commonly used combinations are introduced:
7.1m3/h：立方米每小时
7.1m3/h: cubic meter per hour
7.2g/h：千克每小时
7.2g/h: kilogram per hour
7.3Nm3/h：标准立方米每小时
7.3Nm3/h: normal cubic meter per hour
压缩气体
品质&能耗精细化管理解决方案
压缩气体系统能耗检测解决方案，采用智能型高精度仪表建立系统动态模型，针对系统变化特征进行专业分析,辅以先进的设备和管理手段，为企业节能降耗提供科学依据和科学方法，降低生产成本。
For the energy consumption detection solution of compressed gas system, the intelligent high-precision instrument is used to establish the system dynamic model, and professional analysis is carried out for system change characteristics, supplemented by advanced equipment and management means, so as to provide scientific basis and scientific methods for energy conservation and consumption reduction of enterprises and reduce production costs. 压缩气体系统品质检测解决方案，采用智能型高精度仪表进行数据检测为压缩气体品质管理提供决策依据和优化方案，为产品质量提升保驾护航，增强企业竞争力，获取更多利润。
The quality inspection solution of compressed gas system uses intelligent high-precision instruments for data detection to provide decision-making basis and optimization scheme for compressed gas quality management, ensure product quality improvement, enhance enterprise competitiveness and gain more profits.
通过建立系统模型，掌握压缩气体品质&能耗和产品的联动关系，包括产品、单机能耗、产能对应关系、压力分布、系统冷却状况等，根据数据进行系统动态分析，找出系统供需规律，结合生产需求，针对性进行系统改造，优化系统品质、可靠性和能耗，进行精细化管理，从而达到节能减排降耗的目的，提升产品竞争力，获取更多利润！
By establishing a system model, master the linkage relationship between compressed gas quality, energy consumption and products, including product, single unit energy consumption, capacity correspondence, pressure distribution, system cooling state, etc., carry out system dynamic analysis based on data, find out the law of system supply and demand, carry out system transformation according to production demand, optimize system quality, reliability and energy consumption, and carry out refined management, so as to achieve the purpose of energy conservation, emission reduction and consumption reduction, Improve product competitiveness and gain more profits!
SISEN提供更高级别的压缩气体系统专业数据分析服务。通过SISEN SAS系统检测服务，获取系统关键点的连续数据，可进行系统动态建模，分析需求侧和供给侧的联动关系，为系统精细化管理提供科学依据。
SISEN provides higher-level professional data analysis services for compressed gas systems. Through the SISEN SAS system detection service, the continuous data of key points of the system can be obtained, the system dynamic modeling can be carried out, and the linkage relationship between the demand side and the supply side can be analyzed to provide a scientific basis for the refine management of the system.
涡街流量计的安装要求
Installation Requirements of Vortex Flowmeter
Installation requirements
涡街流量计是一种对管道流场要求较高的流量计，为了确保流量计测量的准确度，涡街流量计在管线上安装必须注意以下事项：
Vortex-shedding flowmeter is a flowmeter with high requirements for pipeline flow field. In order to ensure the measurement accuracy of the flowmeter, the following matters must be paid attention to when installing the vortex flowmeter on the pipeline:
1、适用工况
1.Applicable working conditions
涡街流量计适用于测量气体、蒸汽和液体流量。
Vortex-shedding flowmeters are suitable for measuring gas, vapor and liquid flows.
流量计特别适合于测量：
The flowmeter is particularly suitable for measuring:
1.1低粘度的清洁液体（<10cP）
1.1Clean liquid with low viscosity (<10cP)
1.2低粘度烃类（<10cP）
1.2Low viscosity hydrocarbons (<10cP)
1.3水
1.3Water
1.4低腐蚀性化学品
1.4Low corrosive chemicals
1.5饱和蒸汽、过热蒸汽，包括食品行业中的CIP和SIP应用。
1.5Saturated steam, superheated steam, including CIP and SIP applications in the food industry.
为了精确测量体积流量，介质必须满管并具有理想的流态。任何振动都会造成测量值失真，因此应该通过必要的措施避免管线的振动。
In order to accurately measure the volume flow, the medium must be full and have an ideal flow regime. Any vibration will cause distortion of the measured value, so necessary measures should be taken to avoid vibration of the pipeline.
2、流量计的安装位置选择
2.Selection of installation position of flowmeter
2.1环境温度：流量计的工作环境温度不低于-20°C，不高于+70C。如受到生产设备的热辐射时，应采取隔热和通风措施。
2.1Ambient temperature: The working ambient temperature of the flowmeter is not lower than -20°C and not higher than +70°C. In case of thermal radiation from production equipment, heat insulation and ventilation measures shall be taken.
2.2环境空气：避免将流量计安装在含腐蚀性气体的环境中，如只能安装在含腐蚀性气体的环境中，需要提供充分的排风措施。
2.2Ambient air: Avoid installing the flowmeter in an environment containing corrosive gas. If it can only be installed in an environment containing corrosive gas, adequate exhaust measures shall be provided.
2.3当测量介质温度高于150°C时，表头可水平或垂直向下安装（见图1），或选分体形式（同样适用于高空、地下等恶劣环境）（见图2），最大延长距离为10米。
2.3When the temperature of the measuring medium is higher than 150°C, the meter head can be installed horizontally or vertically downwards (see Fig. 1), or in a split form (also suitable for harsh environments such as high altitude and underground) (see Fig. 2), with a maximum extension distance of 10 meters.
2.4当流量计安装于垂直或倾斜的管道时，介质流动方向应由下向上（见图3）。
2.4When the flowmeter is installed on a vertical or inclined pipeline, the medium flow direction shall be from bottom to top (see Fig. 3).
2.5流量计最好安装在室内，必须安装在室外时，应有防潮和防晒的措施。特别注意：雨水不能顺着电缆流入电气接头导致电路损坏，且电气接头必须拧紧，如下图所示。
2.5The flowmeter should preferably be installed indoors. When it must be installed outdoors, moisture-proof and sun-proof measures shall be taken. Special attention: Rainwater cannot flow into the electrical connector along the cable to cause circuit damage, and the electrical connector must be tightened, as shown in the following figure.
2.6机械振动和冲击，流量计的结构是坚固的，不会因振动而损伤，但振动会产生干扰信号，若管道上的振动和冲击强烈，而介质流速又低，则可能导致干扰信号大于流量信号，造成示值误差。因此，流量计应尽可能安装在振动和冲击小的场所，安装位置在（5~20）Hz的振动频率下，要求振动加速度不大于1g或采取减振措施。例如在流量计安装处振源来向的管道上加装固定支撑架。
2.6Mechanical vibration and impact: The structure of the flowmeter is firm and will not be damaged by vibration, but the vibration will generate interference signals. If the vibration and impact on the pipeline are strong and the medium flow velocity is low, the interference signal may be greater than the flow signal, resulting in indication error. Therefore, the flowmeter shall be installed in a place with small vibration and impact as far as possible, and the installation position shall be at the vibration frequency of (5~20) Hz. The vibration acceleration shall not be greater than 1g or vibration reduction measures shall be taken. For example, a fixed support frame is installed on the pipeline from which the vibration source comes at the installation position of the flowmeter.
2.7为便于调试、拆装、现场维护流量计，安装流量周围须有充裕的空间，表头上方净空间至少为0.5米（见图4）,若不能保证，安装式应调整安装角度。
2.7In order to facilitate commissioning, disassembly and on-site maintenance of the flowmeter, there must be sufficient space around the installation flow, and the clear space above the meter head shall be at least 0.5m (see Fig. 4). If it cannot be guaranteed, the installation angle shall be adjusted for the installation type.
2.8流量计上游应尽量避免安装调节阀和半开阀，可以根据工艺要求在流量计下游5D之后安装（见图5），若必须安装在流量计的上游，那么流量计上游直管段应不小于50D。
2.8The upstream of the flowmeter shall avoid installing regulating valves and half-open valves as much as possible, which can be installed after 5D downstream of the flowmeter according to the process requirements (see Fig. 5). If it must be installed upstream of the flowmeter, the straight pipe section upstream of the flowmeter shall not be less than 50D.
2.9水击现象：在水平管道上测量蒸汽流量时，流量计安装位置一定不要处于所在管道的低处，因为一段管道的低处肯定是冷凝积存的地方，运行过程中容易产生水击现象，这将严重影响流量计的正常测量，严重时可能会对探头造成损坏，流量计应安装在管道的高处,且在前面管道低处安装疏水阀。
2.9Water hammer: When measuring the steam flow on a horizontal pipeline, the installation position of the flowmeter must not be at the low point of the pipeline, because the low point of a section of pipeline must be a place where condensation accumulates, and water hammer is easy to occur during operation, which will seriously affect the normal measurement of the flowmeter and may cause damage to the probe in serious cases. The flowmeter shall be installed at the high point of the pipeline, and a drain valve shall be installed at the low point of the front pipeline.
2.10流量计的接线位置要远离电噪声，如大功率变压器、电动设备等。
2.10The wiring position of the flowmeter shall be far away from electrical noise, such as high-power transformers and electric equipment.
2.11流量计安装点附近不能有无线电收发机存在，否则高频噪声会干扰流量计的正常使用。
2.11There shall be no radio transceiver near the installation point of the flowmeter, otherwise high-frequency noise will interfere with the normal use of the flowmeter.
2.12信号传输距离：电流输出信号最大传输距离500米，脉冲输出信号最大传输距离1000米。
2.12Signal transmission distance: The maximum transmission distance of current output signal is 500m, and the maximum transmission distance of pulse output signal is 1000m.
3、管道安装与要求（根据"中华人民共和国机械行业标准”，编号JB/T9249-2015）
3.Pipe installation and requirements (according to "Standard of Machinery Industry of the People's Republic of China", No. JB/T9249-2015)
3.1流量计的上、下游应配置一定长度、无阻塞的直管段。直管段的安装要求见下图。
3.1The upstream and downstream of the flowmeter shall be equipped with a certain length of non-blocking straight pipe section. See the following figure for the installation requirements of straight pipe section.
注："D"代表流量计内径。
Note: "D" represents the inner diameter of the flowmeter.
例如:在DN50的管道上安装内径D=50mm的流量计时，如①所示同径管安装，此流量计要保持上游侧20D与下游侧5D是直管段（且无弯管接头等），上游侧20D=20x50mm=1000mm，下游侧5D=5x50mm=250mm，合计总直管段长1250mm。（当安装直管段无法满足前20D后5D时则至少且必须满足前10D后5D）。
For example, when installing a flowmeter with an inner diameter of D=50mm on a DN50 pipeline, as shown in Fig. ①, the flowmeter shall be installed on the same-diameter pipe. For this flowmeter, the upstream 20D and downstream 5D shall be straight pipe sections (without elbow joints, etc.), the upstream 20D=20x50mm=1000mm, and the downstream 5D=5x50mm=250mm. The total length of straight pipe section is 1250mm. (When the installed straight pipe section cannot meet the requirement of upstream 20D and downstream 5D, at least and must meet the requirement of upstream 10D and downstream 5D).
3.2涡街流量计的上游侧和下游侧应留有与涡街流量计内径相同的直管段。直管段的上、下游长度随管道状况不同而异。涡街流量计的上、下游直管段范围内不应有阀门或旁通管，在涡街流量计的上游侧不应设置流量调节阀。
3.2The upstream and downstream sides of the vortex flowmeter shall be reserved with straight pipe sections with the same inner diameter as the vortex flowmeter. The upstream and downstream lengths of the straight pipe section vary with the pipe condition. There shall be no valves or bypass pipes within the upstream and downstream straight pipe sections of the vortex flowmeter, and no flow regulating valve shall be set on the upstream side of the vortex flowmeter.
3.3涡街流量计在管道上可以水平、垂直或倾斜安装但是当测量液体时，管道内必须充满液体。因此在垂直或倾斜管道上安装涡街流量计，液体的流动方向应自下向上。测量气体与液体的管道安装要求如下图所示。
3.3The vortex flowmeter can be installed horizontally, vertically or obliquely on the pipeline, but the pipeline must be filled with liquid when measuring liquid. Therefore, if the vortex flowmeter is installed on vertical or inclined pipes, the flow direction of liquid shall be from bottom to top. The installation requirements of pipelines for measuring gas and liquid are shown in the following figure.
严禁将流量计安装在低于管道弯头的位置①，容易有冷凝液聚集②，冷凝液会导致气穴和测量不准确。在特定条件下，流量计会受损而导致被测介质泄漏。
It is strictly prohibited to install the flowmeter at a position below the pipe elbow ①, as condensate is easy to accumulate ②, which will lead to cavitation and inaccurate measurement. Under certain conditions, the flowmeter will be damaged and cause leakage of the measured medium.
严禁将流量计安装在高于管道弯头的位置①，有气泡聚集的风险②，气泡会造成压力波动和测量不准确。
It is strictly prohibited to install the flowmeter at a position above the pipe elbow ①. There is a risk of bubble accumulation ②. Bubbles will cause pressure fluctuation and inaccurate measurement.
严禁将流量计安装在垂直向下流动的管道③或出口管的上游④，会有不满管的风险而导致测量不准确。
It is strictly prohibited to install the flowmeter on the pipe flowing vertically downward ③ or the upstream of the outlet pipe ④, which may cause the risk of not filling the pipe and resulting in inaccurate measurement.
4、流量计安装步骤
4.Installation steps of flowmeter
4.1在满足直管段前提下，切一段直管，长度L为M-（20±4）mm。
4.1On the premise of meeting the straight pipe section, cut a straight pipe with a length L of M-(20±4)mm.
4.2将流量计与垫片、法兰、螺栓组合成套，放入切开口处，注意流量计本体箭头方向和角度。
4.2Assemble the flowmeter with gaskets, flanges and bolts, put them into the cut opening, and pay attention to the arrow direction and angle of the flowmeter body.
4.3在管道与法兰接缝处点焊定位。
4.3Spot weld and tack weld at the joint between the pipe and the flange.
4.4拆下螺栓、取下流量计与垫片，将法兰焊好。
4.4Remove the bolts, remove the flowmeter and gasket, and weld the flange.
4.5装上密封垫片，装上流量计，拧紧螺栓。
4.5Install the sealing gasket, install the flowmeter and tighten the bolts.
5、安装中应注意的问题
5.Precautions during installation
5.1被测介质流向必须与流量计流通本体上的流向箭头标志一致；
5.1The flow direction of the measured medium must be consistent with the flow direction arrow mark on the flowmeter body.
5.2检测放大器与流量计是按照测量范围和公称通径配套的，不能互换。安装卡装式流量计时，可通过专用凹面保证管道和流量计流通本体同心，并注意密封垫不能深入管中；5.3安装流量计的管道内径必须与流量计的内径一致，通常管道内径与涡街流量计表体内径误差应≤2%，否则应重新配管；
5.2The detection amplifier and the flowmeter are matched according to the measuring range and nominal diameter, and cannot be interchanged. When installing the card-mounted flowmeter, the special concave surface can be used to ensure that the pipeline and the flowmeter body are concentric, and the sealing gasket cannot go deep into the pipeline. 5.3 The inner diameter of the pipeline where the flowmeter is installed must be consistent with the inner diameter of the flowmeter. Generally, the error between the inner diameter of the pipeline and the inner diameter of the vortex flowmeter body shall be ≤ 2%, otherwise, the pipeline shall be re-configured.
5.4涡街流量计两侧的密封垫片内径必须与流量计内径一致，严禁使用小于流量计内径的垫片。法兰连接型涡街流量计在安装时要防止两侧垫片部分进入管道内，否则流量计将不能正常工作；
5.4The inner diameter of the sealing gaskets on both sides of the vortex flowmeter must be consistent with the inner diameter of the flowmeter. It is strictly prohibited to use gaskets smaller than the inner diameter of the flowmeter. When installing the flanged vortex flowmeter, prevent the gaskets on both sides from entering the pipeline, otherwise the flowmeter will not work normally.
5.5安装流量计时，禁止带着流量计直接在线满焊，否则满焊时产生的热量会损坏流量计的仪表及电子元件；
5.5When installing the flowmeter, it is forbidden to directly carry the flowmeter through in-service full-length welding, otherwise the heat generated during full-length welding will damage the instrument and electronic components of the flowmeter.
5.6测量高温介质时，切勿用隔热材料把传感器连接杆周围包起来；
5.6When measuring high-temperature medium, do not wrap the sensor connecting rod with heat insulation materials.
5.7安装流量计前应严格清除管道内杂物，如:碎片、焊渣、石块、粉尘等，避免通流后堵塞或杂物在管道内高速运行下撞击传感器导致失灵；
5.7Before installing the flowmeter, the sundries in the pipeline, such as debris, welding slag, stones, dust, etc., shall be strictly removed to avoid blockage after flow passage or failure caused by sundries impacting the sensor under high-speed operation in the pipeline.
5.8测量蒸汽时，首次用汽或蒸汽管道停汽时间长，须慢慢微量开启阀门，等阀门后管道温度升高至蒸汽温度，管道内冷凝水基本全部排出后，阀门两侧压力基本相同后，再慢慢全部打开。否则容易导致管道快速膨胀，损坏管道支架和流量计，与水锤同时作用，后果严重。
5.8When measuring steam, if the steam is used for the first time or the steam pipe is shut down for a long time, the valve must be opened slowly and slightly. After the temperature of the pipe at downstream side of the valve rises to the steam temperature, the condensate in the pipe is basically discharged, and the pressure on both sides of the valve is basically the same, the valve shall be opened slowly and fully. Otherwise, it is easy to cause rapid expansion of the pipe, damage the pipe support and flowmeter. When act simultaneously with the water hammer, the consequences are serious.
涡街流量计选型设计技术指南
Technical Guide for Selection and Design of Vortex Flowmeter
1、涡街流量计的选型
1.Selection of vortex flowmeter
涡街流量计选型的正确与否将直接影响到仪表的正常运行，用户应引起高度重视涡街流量计在选型时应遵循以下原则:1.1首选夹持式涡街流量计，它是结构简单、功能齐全、性价比最好的涡街流量计。
The correct selection of vortex flowmeter will directly affect the normal operation of the instrument. Users should pay high attention to the following principles when selecting vortex flowmeter: 1.1 Clamping type vortex flowmeter is preferred, which is a vortex flowmeter with simple structure, complete functions and the best cost performance.
1.2在以下情况选择温压一体式涡街流量计：
1.2Temperature-pressure integrated vortex flowmeter shall be selected in the following conditions:
①不具备接收温度、压力、流量信号的系统或流量积算仪。
①Systems or flow totalizer that do not have the capability to receive temperature, pressure and flow signals.
②测量气体或蒸汽需要温度压力补偿，不愿意单独配置压力变送器、铂电阻。
②Temperature and pressure compensation are required for measuring gas or steam, and it is unwilling to configure pressure transmitters and platinum resistors separately.
1.3当口径≤300mm时，应选择满管式涡街流量计；当口径300≤D≤600mm时，可选择满管式或插入式涡街流量计；当口径≥600mm时，选择插入式涡街流量计。
1.3When the diameter is ≤300mm, the full-tube vortex flowmeter shall be selected; when the diameter is 300≤D≤600mm, the full-tube or plug-in vortex flowmeter can be selected; when the diameter is ≥600mm, the plug-in vortex flowmeter shall be selected.
2、涡街流量计选型步骤
2.Selection steps of vortex flowmeter
2.1根据介质的工况数据和使用需要选择涡街流量计类型。
2.1Select the type of vortex flowmeter according to the working condition data and use needs of the medium.
2.2根据被测量介质的流量范围正确计算选择口径。
2.2Correctly calculate and select the caliber according to the flow range of the measured medium.
2.3根据被测量介质的技术参数正确选择仪表材质。
2.3Select the instrument material correctly according to the technical parameters of the measured medium.
2.4根据被测量介质的技术参数选择压力等级、温度等级。
2.4Select the pressure grade and temperature grade according to the technical parameters of the measured medium.
2.5根据测量或控制要求选择流量计的输出方式。
2.5Select the output mode of the flowmeter according to the measurement or control requirements.
2.6根据安装要求和管道要求选择连接方式。（夹持式涡街流量计更易于正确安装和使用）
2.6Select the connection mode according to the installation requirements and pipeline requirements. (Clamping type vortex flowmeter is easier to install and use correctly)
2.7根据现场条件选择防爆要求。（本安防爆型流量计比隔爆型流量计更易于维护和调试）
2.7Select explosion-proof requirements according to site conditions. (Intrinsically safe explosion-proof type flowmeter is easier to maintain and debug than flameproof flowmeter)
2.8根据现场条件选择一体式、分体式或防爆型流量计。
2.8Select integrated, split or explosion-proof type flowmeters according to site conditions.
2.9如果是测量气体或蒸汽，考虑温度和压力补偿方式。
2.9In case of measuring gas or steam, temperature and pressure compensation methods shall be considered.
