# Vortex Flow Meter Wafer or Flange Connection. - Steam - Liquid - Gas

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1 Vortex Flow Meter Wafer or Flange Connection - Steam - Liquid - Gas

2 Working Principle & Circuit Diagram Working Principle When a column body placed in flowing fluids in pipe, a series of vortices will be generated alternately on each side of the object as shown as below, these eddies known as Karman Vortices, the frequency of the vortex shedding is related to the velocity of the fluid and the width of the body. Expressed by formula as below: f=st.v/d Thereinto f----frequency of Karman Vortex shedding St----Strouhal number v----velocity d----width of column object Because the frequency of the vortex shedding is proportional to the velocity, it can be used to calculate the instantaneous flowrate. Strouhal number is a very important coefficient in the Vortex Flowmeter. In the range of straight line of St 0.17 in curve, frequency of vortex shedding is proportional to the velocity, so as long as the frequency (f) be detected, the velocity (v) will be obtained, and volumetric flowrate will be got according to v. For KBLU Vortex Flowmeter, its frequency of the vortex shedding was detected by the stress force which exerted on the sensor (probe) using the piezoelectric unit which is built in sensor. 1

3 SPECIFICATIONS Accuracy: Liquid: Gas: Steam: ±1.0% of reading ±1.5% of reading ±1.5% of reading Materials: Housing: SS316 Shedder Bar: SS316 Converter housing and case cover: Aluminum Alloy Output Signal: (Where applicable) Sensor: Pulse signal (Low Level: 1V; High Level: 6V) Transmitter: 4 to 20 ma DC current signal Signal Transmission Distance: 500 m Electrical Connections: Protection Level: Vibration: ISO M Female IP g

4 OPERATION CONDITIONS Ambient: Temperature: -10C to +55 C Relative Humidity: 5% to 90% Power Supply: Sensor: Transmitter: Field Display Type: +12V DC (Optional: +24V DC) +24V DC Integral 3.2V Lithium Battery or +24V DC or 230V AC Fluid Temperature and Pressure: Temperature: Standard: -20 C to +70 C Optional: -20 C to +250 C; -20 C to +350 C Pressure: Media pressure should be limited according to flange rating. Measurable Flow Rate Range: For general liquids and gas: (See table 1) Table 1. Measurable Flow Rage Range for liquid and gas Nominal Liquid Gas Diameter (mm) (in.) Flow (m 3 /h) Frequency(Hz) Flow (m 3 /h) Frequency(Hz) to to to to to to to to to 35 9 to to to to 68 8 to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to 136 Note: The flow range for gas in table 1 is defined at operating state.

5 For Saturated Steam: (See table 2) Absolute pressure (MPa) Temperature ( C) Density (Kg/m 3 ) Table 2. Measurable Flow Rage for Saturated Steam DN25 DN40 DN50 DN65 DN80 DN100 DN125 DN150 DN200 DN250 DN300 Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Flow Unit Kg/h

6 Model Selection (See Table 4) Model Suffix Code Table 4. Model Selection Guide BFVM - / / / / / / Description 1 Flange connection Connection type 2 Wafer Connection (between flanges) Gas 1 Medium Liquid 2 Steam 3 Nominal Diameter (Code) Display Option Function Type EU Rating 25 25mm 40 40mm 50 50mm 65 65mm 80 80mm mm mm mm mm mm mm Z Integrated type (Optional: N; A; B; C; D) F Remote type (Optional: N; C) N A B C C1 D N Basic Type: +12V to +24V DC Power Supply; Pulse Output 4 to 20 ma current output Battery Power Supply with filed Display Field Display and 4 to 20 ma current output Field Display and RS485 24V DC; Temperature & Pressure Compensation Standard type

7

8 Mounting Orientation All of our vortex flow meters are designed to measure flow in only one direction. See marking on body Required Length of Straight pipe Runs Flow profile altering items such as elbows, valves and reducers can affect accuracy. See diagram 1 for typical flow meter system installation. Diagram 1. Typical Flow Meter System Installation The recommended guidelines are given to enhance accuracy and maximize performance. Distances given here are minimum requirements. Upstream: allow a minimum straight pipe length of at least 10 times the internal diameter of the pipe. For example, with 50mm pipe, there should be 500mm of straight pipe immediately upstream. Ideal upstream straight pipe length is 1000mm. Downstream: allow a minimum straight pipe length of at least 5 times the internal diameter of the pipe. For example, with 50mm pipe, there should be 250mm of straight pipe immediately upstream. Ideal upstream straight pipe length is 500mm.

9 Transducer Installed in Vertical Pipe When used in gas, transducer could be installed in vertical pipe with no considering of flow direction, but for gas contains few liquid, the gas flow direction should be from bottom to top. When used in liquid, flow direction should be from bottom to top, avoid extra weight of the liquid to exert on the probe. Lateral Installation in Horizontal Pipe Transducer can be installed laterally in horizontal pipe for all fluids. Particularly for superheated steam, saturated steam and cryogenic liquids, if allowed, transducer should be installed laterally to avoid amplifier from being affected greatly by temperature. Inverse Installation in Horizontal Pipe It is not suggested to install transducer inversely for normal gas or superheated steam, but it is suitable to saturated steam, high temperature liquid or the condition that dirty pipe needs cleaning frequently. 15

10 5. Requirement for Ambient Condition 1) Avoid transducer being installed in place where temperature changes greatly or heat radiation occurs. If it is necessary, take some measures to isolate thermal or ventilation. 2) Avoid transducer being installed in place where corrosive atmospheres surrounded. If it is necessary, take on some enforced ventilation measures. 3) It had better transducer be installed indoors. If sensor must be installed outdoors, bend the cable into U shape at the electrical port to avoid raining water into the box of amplifier along with the cable. 4) Sufficient space should be around transducer for convenient installation and regular maintenance. 5) Connection of transducer should be far away from electrical noise interference, such as big power transformer, electromotor and radio frequency interference etc. 6) There should be no frequency converter near transducer. Otherwise, normal performance will be affected by high frequency interference. 7) There should be no strong vibration source near transducer installing point. Damping measures should be taken once needed. Transducer Installed in Horizontal Pipe It is the most common way to install transducer in horizontal pipe. When used in gas, transducer should be installed at the top of pipeline if the gas contains few liquid. When used in liquid, transducer should be installed at the bottom of pipeline if the liquid contains little gas. 14

11 How to Select Pressure and Temperature Measuring Point If you require measuring pressure or temperature near the flowmeter, pressure measuring point should be 3~5D at downstream of transducer and temperature measuring point should be 6~8D at downstream of transducer. Preparation before Operation 1. Check the transducer mounting and wiring if it is correct; 2. Power on indicator and check if there is flow indication; 3. Open the valve slowly and stop once get a small pressure, then check if any leakage happens around the transducer or flow indication available in the indicator; 4. If condition is normal, open the valve fully and stabilize for a few minutes to check if it works properly. 20

12 See diagram 2 for straight pipe length requirement when there is a flow profile altering item Diagram 2. Number of Pipe Diameter (D=Diameter)

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