CATALOG KVFN. Vortex Flowmeter

Transcription

1 CATALOG KVFN Vortex Flowmeter

2 Main Features of KVFN Intelligent Vortex Flow Transducer Best of KVFN Intelligent Vortex Flow Transducer is piezocrystal built in bluff body to avoid fluid turbulence caused by external type, no zero drift, and high repeatability. By lots of wave analysis of vortex flow transducer in a long time, Shanghai Kent has designed the most scientific probe shape, wall thickness, height, probe rod diameter and matching piezocrystal, adopts advanced CNC to machine to ensure technical parameters of proper alignment and smooth finish etc., and with special treating process to maximatily overcome existed signal influence by intrinsic self-oscillation frequency. KVFN Intelligent Vortex Flow Transducer has good commonality and interchangeability. Adopt advanced CNC to machine parts such as transducer body and bluff body etc. to ensure machining accuracy to make parts( especial for bluff body) has good commonality, so that, repeatability and accuracy won t be affected by parts change and get signal with high signal noise ratio and good stability. Simple & fixed structure, no moving parts, high reliability, convenient maintenance. Wide measuring range, turndown ratio can reach 10:1 in Reynolds Number ~ Detecting element not contact with the measured fluids directly, stable performance and long service life. Detecting probe and bluff body installed independently, and high temperature resistance piezocrystal sealed in bluff body make transducer simple structure, good commonality and high stability. Output pulse signal and current signal directly proportional to flowrate, and have RS-485, Hart, ModBus communication for convenient computer networking. When vortex flow transducer measures liquid volumetric flow, it does not need temperature, pressure compensation. Vortex output signal is linear to velocity, that is to say, directly proportional to volumetric flowrate. When measure gas or steam, it needs temperature and pressure compensation. Compensating pressure and temperature is to get volumetric flow of gas under standard state or mass flow of steam. Low pressure loss, just 1/4 ~ 1/2 of orifice plate. In a specific range of Reynolds Number, flow character just refers to bluff body shape and dimension, and not affected by fluid pressure, temperature, viscosity, density and ingredients. Wide application, can measure flowrate of steam, gas, liquid etc. 0

3 Contents Technical parameter table of KVFN intelligent vortex flow transducer Precaution of KVFN intelligent vortex flow transducer Select methods of KVFN intelligent vortex flow transducer Procedure of KVFN intelligent vortex flow transducer selection Selection table of KVFN Intelligent Vortex Flow Transducer Process parameters needed for KVFN Intelligent Vortex Flow Transducer selection Precaution of handle & transportation Precaution of storage Precaution of installing location selection Precaution of installation & application Straight pipe requirement Installation type How to select pressure and temperature measuring point Wiring Outer dimension (wafer type) Outer dimension (flange type) Outer dimension (fixed insertion type) Installation of fixed insertion transducer Outer dimension (adjustable insertion type) Installation of adjustable insertion transducer Application precaution for explosion proof vortex flow transducer Application precaution for flameproof vortex flow transducer Application precaution for intrinsical safe vortex flow transducer Appendix. 1 Measuring principle of vortex flow transducer Appendix. 2 Amplifier circuit Appendix. 3 Gas character & essential data Appendix. 4 Density of overheated steam Appendix. 5 Density of saturated steam

4 Technical Parameter Table of KVFN Intelligent Vortex Flow Transducer Measured fluid: Saturated steam, overheated steam, gas, liquid (avoid multi-phase fluid): 1

5 Precaution of KVFN Intelligent Vortex Flow Transducer Selection Measuring Range Vortex flow transducer can not be used to measure fluid with low Reynolds Number (Re ). Since Strouhal Number changes with low Reynolds Number, Meter accuracy will become less, and high viscosity fluid will affect or even prevent eddies generated. Therefore, should select product according to flowrate range in this catalog. For stable operation, flowrate would be better at 30 ~ 70% of vortex flow transducer measuring span. Application below Reynolds Number should be limited. High Temperature Type When fluid temperature 250,must use high temperature type of vortex flow transducer. Max. Temperature for Inserted Type Inserted transducer is just used at location with fluid temperature 180. Temperature & Pressure Compensation Normally, it does not need compensation when measure liquid volumetric flow. When measure mass flow of overheated steam and volumetric flow of gas, it needs temperature & pressure compensation, and pressure (or temperature) compensation for mass flow of saturated steam. Dirty of Fluid Vortex flow transducer is suitable to be used for lots of fluid, however, should pay special attention to dirty of fluid. Because fluid with solid particles eroding bluff body will cause noise and wear off bluff body. Short fiber intertwining bluff body will change meter factor. Vortex flow transducer can be used to measure gas-liquid two phase fluid mixed with little dispersive even bubbles and volumetric gas content 2%; also can be used to sporadic, even solid particles, but volumetric solid content should be less than 2%. 2

6 Selection Methods of KVFN Intelligent Vortex Flow Transducer Measuring range of Shanghai Kent KVFN Intelligent Vortex Flow Transducer: When measure liquid, affected by pressure loss and cavitation erosion, upper limit of velocity is 0.7~5.5m/s; When measure gas, upper limit is affected by fluid compressibility, down limit by Reynolds Number and sensitivity of transducer, velocity is 7~55m/s (7~50m/s for DN 200). 1. DN selection of Vortex Flow Transducer It is very important to select meter nominal diameter and specification. Selection should abide by certain principles. Nominal diameter selection should accord to the following three points to ensure flow transducer keep good working status: (1) When select flow transducer, nominal diameter should converge properly to get bigger velocity and proper flowrate span; (2) When measure liquid, should confirm that for smaller nominal diameter, process pipe should have enough back pressure to avoid causing cavitation. When measure liquid, gas and saturated steam, pressure loss caused by vortex flow transducer should affect production process least. (3) For convenient selection, can select according to simple calculation and checkup relevant parameter table in this catalog. Nominal diameter selection of vortex flow transducer is as below: Firstly, should make sure the following process parameters: (1) Fluid name, ingredients (2) Max., normal and min. flowrate under operating condition (3) Max., normal and min. pressure and temperature under operating condition (4) Viscosity of measured fluid under operating condition Nominal diameter selection for liquid flowrate Select proper nominal diameter according to max., normal, min. flowrate under operating condition and calculate the down limit Reynolds Number when fluid flows to ensure Reynolds Number ; meanwhile, calculate the pressure loss and back pressure. Nominal diameter selection for gas flowrate Select proper nominal diameter according to max., normal, min. flowrate under operating condition, and calculate the down limit Reynolds Number when fluid flows to ensure Reynolds Number ; meanwhile, calculate the pressure loss. Because the output signal of vortex flow transducer is proportional to volumetric flowrate under operating condition, if volumetric flowrate under standard state or mass flowrate is known, should change it into volumetric flowrate under operating condition. Thereinto: q v -----Volumetric flowarte under operating condition(m 3 /h) q n -----Volumetric flowrate under standard condition(m 3 /h) P------Absolute pressure under operating condition(pa) 3

7 P n -----Absolute pressure under standard condition(pa) T------Thermodynamic temperature under operating condition(k) T n Thermodynamic temperature under standard condition(k) Fluid Density р and Volumetric Flowrate q v under Operating Condition Thereinto: ρ-----flow density under operating condition(kg/m 3 ) ρ n -----Flow density under standard condition(kg/m 3 ) Other symbols are the same as above. Thereinto: q v -----Volumetric flowrate under operating condition(m 3 /h) Q m -----Mass flowrate under operating condition(m 3 /h) 2. Calculation of Reynolds Number, Pressure Loss and Back Pressure When select nominal diameter of vortex flow transducer, should check up Reynolds Number for down limit of flowrate, which should meets two conditions: smallest Reynolds Number should be no less than down limit of Reynolds Number; For stress type vortex flow transducer, vortex strength of down limit flowrate should be no less than design value (relationship between vortex strength is proportional to lift force, depends on the design of bluff body). When measure liquid, should check up whether min operating pressure is higher than saturated steam pressure under operating temperature, that is to say, whether cause cavitation. Reynolds Number: It is a dimensionless number of fluid of inertia force to viscosity force. Thereinto: Q-----Volumetric flowrate (m 3 /h) D-----Inside diameter(mm) υ Kinematic viscosity (m 2 /s) Pressure Loss: P Thereinto: P -----Pressure loss (kg/cm 2 ) ρ-----fluid density(kg/m 3 ) V Velocity(m/s) Back Pressure: Pipe Pressure of Flow Transducer Downstream Thereinto: P -----Min pipe pressure at flow transducer downstream 3.5~7.5D (kg/cm 2 abs) P Saturated steam pressure of liquid(kg/m 2 abs ) P -----Pressure loss (kg/cm 2 ) 4

8 3. Selection of Pressure & Temperature Resistance Pressure resistance of transducer is selected according to 1.2 times or more of Max. operating pressure under process condition; Stress type vortex flow transducer adopts piezo crystal as detecting element. Because limited by temperature, -40~250 is standard type (-40~120 for inserted type), 100~350 is for high temperature type. 4. Selection of Protection Class Select according to process protection requirement on site. 5. Selection of Explosion Proof Select according to process explosion proof requirement on site. There are three types of explosion proof: no, flame proof, intrinsical safe to select. 6. Selection of Output Signal Can select 4~20mA, pulse, RS-485, Hart, ModBus according to measuring and control requirement. 5

9 Procedure of KVFN Intelligent Vortex Flow Transducer Selection 1. Find out measured fluid and relevant process parameter in detail The following parameter must be known in detail: 1 Fluid name, ingredients, state, viscosity Confirm whether Vortex flow transducer can be used or not 2 Fluid temperature, pressure Confirm whether the temperature and pressure is proper or not 3 Fluid measuring range Confirm whether up & down flowrate is within measuring range 4 Corrosivity Confirm material 5 Installing environment Confirm whether explosion proof needed or not 6 Output signal, communication Confirm communication protocol 7 Local display or remote output Precaution while Vortex Flow Transducer Selection Vortex flow transducer is one kind of velocity type flowmeter. Reliability of vortex separation is affected by velocity distribution, therefore, straight pipe is required, please select according to this catalog; When measure liquid, up limit velocity is 5.5m/s limited by pressure loss and cavitation erosion; When measure gas, up limit velocity limited by fluid compressibility and down one limited by Reynolds Number and transducer sensitivity, generally, velocity of gas and steam is 7~55m/s (7~50m/s for DN 200); Stress type vortex flow transducer is sensitive to vibration, therefore, should take measures of vibration damping on installing pipe with strong vibration; Stress type vortex flow transducer adopts piezo crystal as detecting element. Since limited by temperature, -40~250 is standard type (-40~120 for inserted type), 100~350 is for high temperature type. 6

10 2. Selection of Vortex Flow Transducer DN Selection of measuring saturated steam mass flowrate Measuring range (t/h) (Note: Pressure above is gauge pressure) 7

11 (Continued) (Note: Pressure above is gauge pressure) 8

12 9

13 10

14 Selection Table of KVFN Intelligent Vortex Flow Transducer 11

15 Process Parameters Needed for KVFN Intelligent Vortex Flow Transducer Selection (1) Fluid name (2) Outer & Inner diameter of pipeline(mm) (3) State of measured media: Liquid, Gas, Steam (4) Scale flowrate unit (kg/ h, t/h, m 3 / h, Nm 3 / h) a) Under operating condition b) Under standard condition (5) Normal flowrate (6) Min flowrate, Max flowrate (specify the state of flowrate for gas medium) a) Under operating condition b) Under standard condition (7) Operating pressure (MPa) a) Absolute pressure b) Gauge pressure (8) Fluid temperature( ) : Max, Min, Normal (9) Fluid density (kg/ m 3 ) (specify the state of flowrate for gas medium) a) Operating Status b) Standard Status (10) Viscosity (Pa. s) (11) Gas component Volume percentage (for more than two kinds of mixed gas) (12) Explosion proof a) Intrinsical safe b) Flame proof (13) Pipe flange a) According to standard, code is for flange standard b) Flange drawing provided by customers (14) Output signal 4~20mA DC, pulse output, RS-485, Hart, ModBus (15) Power supply 24V DC, 3.6V lithium battery, 24V DC 3.6V lithium battery double power supply Notice: (1)~(8), (11)~ (15) must be provided for water & steam measurement. (1)~ (15) are provided for common gas (1) (2), (4) ~(10), (12)~(15) are provided for common solution & light oil. Please provide detailed value for parameters. Range value does not work. 12

16 Precaution of Handle & Transportation In order not to be damaged, do not open the package before meter received by customer. Handle with care during the transportation, do not crash, drench, impact and vibrate. Precaution of Storage Flow transducer should be installed in time once it arrives at the using place to avoid insulativity of amplifier reducing and metal parts being corroded etc. Pay special attention to follow things: (1) Try not to open the package to store in any condition; (2) Storage place should be: a. Damp proof and rain-proof b. Little mechanical vibration c. Temperature between -35~60, ideal temperature is about 25. (3) Should clean meter body totally before store used vortex flow transducer. (4) The flow transducer performance will be affected if long time outdoor storage. Therefor, please install it immediately once it is carried to the installing site. 13

17 Precaution of Installing Location Selection Although we have considered bad working condition during design, in order to ensure good performance and stability, should pay attention to the follow things when select installing location: (1) Ambient temperature Avoid installing the location with large temperature change. If the meter will be affected by heat radiation, please take measures of heat insulation and ventilation. (2) Ambient air Avoid installing flow transducer at the ambient with strong corrosive gas. If must be installed in corrosive ambient, should take measures of ventilation. (3) Mechanical vibration and impact Although flow transducer has tough structure, still should install flow transducer at location avoiding mechanical vibration and impact from measuring principle. If must install location with big vibration, should install pipe bracket to buffer. (4) Adjustable valve Adjustable valve should be installed downstream 5D away from transducer. If must be installed at upstream, straight pipe for upstream of transducer should be no less than 50D. (5) Water hammer When measure steam flow on horizontal pipe, location of flow transducer must not be on low point of pipe, because this is the location where condensate liquid deposited and cause water hammer easily. For discontinuous delivering gas pipe, water hammer will happen much easier when open-close which will affect flow transducer normal measuring, what s worse, it will damage the probe. Flow transducer should be installed in high point of pipe and install steam trap at low point of front pipe. (6) Others There should be enough space aound vortex flow transducer to: a. Regular maintenance, meter reading b. Wiring, pipe installation 14

18 Precaution of Installation & Application Vortex flow transducer must be used under certain condition. Please confirm whether the transducer is suitable to the operating condition (flowrate, pressure, temperature, explosion proof etc.) or not before installation. After open the package, please install as soon as possible to avoid being corroded by corrosive material or damped by raining. When store used transducer, must clean inside and outside of transducer completely. Avoid transducer being installed in place where temperature changes greatly or heat radiation occurs. If it is necessary, take measures of heat insulation or ventilation. Avoid transducer being installed in place where corrosive atmospheres surrounding. If it is necessary, take some measures of prevention of corrosion. Avoid transducer being installed in place with strong mechanical vibration and impact. If it is necessary to install on pipe with strong vibration, it needs to fasten pipe around transducer. When transducer is installed on the pipe, should not use meter body as lift point to lift meter and pipeline. Straight pipe at up & down stream should be as manual requirement, or it will affect measuring accuracy of transducer, what s worse, will damage transducer. 15

19 Flowing direction must be conformed with the arrow on the transducer. During flange or pipe welding, transducer should not be on the pipe to avoid damaging electronic parts. Avoid transducer installed on long overhead pipe, otherwise leakage will happen between transducer and flange caused by transducer drooping. If can not avoid, fitting device for pipe must be used. Transducer can be installed on vertical or horizontal pipe. For vertical pipe installation, flow direction should be down to up when measure liquid. Avoid transducer installed around valve exit, or open-close of valve will affect the measuring accuracy and meter service life, even damage transducer. For convenient maintenance, should install bypass pipe, especially fluid in pipeline can not be shut down during production. When clean pipeline, cleaning fluid should pass by-pass pipe to avoid damaging meter; if no by-pass line, a duct should be installed temporarily to replace meter. 16

20 Meter had better be installed indoors; if outdoor installation is necessary, should take measures of moisture proof and sun proof. There should be enough space around transducer installed to ensure convenient, wiring and regular maintenance. Specified shielded cable should be used as signal cable and shielding layer should be fastened to metal housing of transducer. Signal cable should not be parallel to power cable, the distance between them should be over 15cm. Place them into independent steel tube would be better. Fix cable and can not be shaken. Installing location of transducer should be far away from electrical noise, such as large power transformer, electromotor, welding machine and strong power supply etc. Radio interference should not be around installing location, otherwise, radio interference will affect normal operation of transducer. When open shutoff valve at up & down stream of transducer, it should be very slowly, and opening time should be no less than 2min. 17

21 Pressure of installing pipe should not exceed maximum rated pressure of transducer. When transducer parts are pressed, can not tighten or loosen fastening screw of probe and installing bolts of flange. Straight Pipe Requirement There are various structure of Vortex Flowmeter, installing & maintenance person should know very well of meter structure, features and flow signal conversion and install according to manual to ensure meter measuring accuracy. 1. Selection proper installation location and ambient Avoid equipment with strong power electrical, high frequency and strong power switch; avoid affected by high heat resources and radiation; avoid location with strong vibration and corrosive ambient etc, meanwhile, consider of convenient maintenance. To ensure fluid section not being affected, vortex flow transducer should be installed downstream any location that can cause fluid disturbing (such as diverging pipe, converging pipe and valve). The longest straight pipe should be used between flow resistance part and flowmeter. If there are two or more flow resistance parts at upstream of flowmeter, the straight pipe should be much longer. 2. Ensure enough straight pipes at upper & down stream The length of straight pipe 15D for upstream and 5D for downstream if converging pipe >15 is used in upstream of transducer installing site (shown as Fig. 1). The length of straight pipe 18D for upstream and 5D for downstream if diverging pipe>15 is used in upstream of transducer installing site (shown as Fig. 2). The length of straight pipe 20D for upstream and 5D for downstream if 90 elbow or T joint is used in upstream of transducer installing site(shown as Fig. 3). The length of straight pipe 25D for upstream and 5D for downstream if two 90 elbows on same plane in 18

22 upstream(shown as Fig. 4). The length of straight pipe 40D for upstream and 5D for downstream if two 90 elbows on different planes in upstream(shown as Fig. 5). Flow or pressure control valve should be installed at least 5D far away from the meter in downstream as possible, if these valves must be installed in the upstream, ensure 50D for upstream at least and 5D for downstream(shown as Fig. 6). 3. Companion pipe should be concentric to flowmeter, and coaxial offset should not be more than 0.05DN. The inside diameter of companion pipe for upstream and downstream should be the same as nominal diameter of flowmeter, and should meet requirements as below: 0.98DN D 1.05DN Thereinto: DN nominal diameter of the flowmeter D inside diameter of the companion pipe Sealing gasket between flange and transducer cannot be protruded into the pipe, and its ID can be slightly bigger than that of transducer. 4. Requirement for Pipe Vibration Avoid transducer being installed on the pipe with strong vibration, if you have to installed, vibration damping measures should be taken. Install fitting device at 2D far away from the flowmeter on both side of upstream & downstream and vibration pad should be used too. 19

23 Installation Type 1. It is the most common way to install transducer on horizontal pipe No matter what kinds of fluid, transducer can be installed on horizontal pipe, especially for overheated steam with enough heat insulating layer and liquid. If the process pipe heat insulating of saturated & overheated steam is not very good, please use it limitedly. (1) When measure gas or steam, transducer should be installed at the top of pipeline if the gas or steam contains few liquid. (2) When measure liquid, transducer should be installed at the bottom of pipeline if the liquid contains little gas. 2. Transducer installed on vertical pipe When used in gas, transducer could be installed on vertical pipe with no considering of flow direction, but for gas contains few liquid, the gas flow direction should be from down to up. When used in liquid, flow direction should be from down to up, avoid extra weight of the liquid to exert on the probe. 3. Lateral installation on horizontal pipe Transducer can be installed laterally on 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. 20

24 4. Inverse installation on 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 situation that dirty pipe needs cleaning frequently. When install, take the following requirements for cable length and min. space as reference: (1) Min space of every direction is 100mm (2) Cable length L +150mm 21

25 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. Thereinto: (1) Condensing flex tube (2) Needle valve (3) Vortex transducer (4) Pressure transmitter (5) Conducting pressure socket (6) Pt100 ( temperature transmitter) (7) Socket of Pt100 (8) L shape duct 22

26 Wiring Wiring for output frequency signal This meter uses three wires to transmit frequency output signal to other external equipments, with power supply 24V ±10%, the minimum load resistor of output circuit 10kΩ, the maximum capacitance 0.22µF, and resistance of shielded wire must be less than 50Ω. Normally, a three cores shielded wire (RVVP3 0.5mm 2 ) is used as connecting wire. The shielding layer should be connected to the grounding screw in amplifier box reliably. Appropriate shielded wire should be used to meet field temperature when meter used in high or low temperature ambient. When the atmosphere surrounded the field contains oil, solvent or other corrosive gas and liquid, appropriate shielded wire should be used to meet this environment. Connecting wire should not be parallel to the power cable, with distance between them more than 15cm at least. Place them in independent steel tube would be better. Fix connecting wire and can not be shaken. Wiring for RS-485 Communication Four wires transmission is applied between vortex flowmeter with RS-485 output and other equipments. Power supply is 24V DC ±10%. Normally, 600V PVC insulated wire or cable should be used as connecting wire. The two cores shielded wire (RVVP2 0.5mm 2 ) should be used where electrical noise occurs likely. The shielding layer should be connected to the grounding screw in amplifier box reliably. Appropriate shielded wire should be used to meet field temperature when meter used in high or low temperature ambient. When the atmosphere surrounded the field contains oil, solvent or other corrosive gas and liquid, appropriate shielded wire should meet this environment. 23

27 Wiring for meter with two-wire 4~20mA output signal This meter uses two-wire to transmit 4~20mA output signal to other equipments, with power supply 24V DC ±10%, the maximum load resistance for output circuit 600Ω(including resistance of cable). Normally, 600V PVC insulated wire or cable should be used as connecting wire. The two cores shielded wire (RVVP2 0.5mm 2 ) should be used where electrical noise occurs likely. The shielding layer should be connected to the grounding screw in amplifier box reliably. Appropriate shielded wire should be used to meet field temperature when meter used in high or low temperature ambient. Wiring for 4~20mA and frequency signal output at the same time 24

28 Wiring for transducer with temperature and pressure compensation 25

29 Outline Dimension( Wafer Type) Notes: 1. This outline drawing is high temperature type vortex flow transducer; standard type does not have cooling fin; 2. Flange dimension refers to GB/T , unit is mm. 26

30 Notes: 1. This outline drawing is high temperature vortex flow transducer; standard type does not have cooling fin; 2. Flange dimension refers to GB/T , unit is mm. 27

31 Outline Dimension (Flange Type) Notes: 1. This outline drawing is high temperature vortex flow transducer; standard type does not have cooling fin; 2. Flange dimension refers to GB/T , unit is mm. 28

32 Outline Dimension(Fixed Insertion Type) Parts: 1. Converter 2. Body flange 3. Short duct with flange 4. Outer wall of customer s pipe 5. Inserted rod 6. Vortex transducer 7. Customer s pipe 8. R=1/2 inner diameter of the pipe (DN<800) R=0.121 inner diameter of the pipe (DN 800) Note: Above information is just for reference, mm for unit. 32

33 Installation of Fixed Insertion Transducer Installation Procedures: 1. Drill a hole in the customer s pipe by method of torch cutting, with diameter slightly less than Φ100, no burr at the edges of the hole to make the measuring probe inserted through it freely. 2. Weld a matched short-duct (supplied by Kent) on the hole on the pipe by spot welding, the axes line of the short-duct is perpendicular 90º to the one of the pipe, as well as its extending line is through the circle center of cross-section of the pipe, then welding all-around. 3. Put gasket of the duct flange, insert probe into the short-duct, then mount bolts and check if it is even around the flange, and the flow direction is conformed. 4. Check all if it is good, open valve slowly and check the leakage (care of personnel safety). Caution: 1. Flow direction must be conformed with the flow arrow on the meter body; 2. When weld the flange and pipe, the transducer should not be installed on the pipe to avoid any damage of the transducer. 33

34 Outline Dimension(Adjustable Insertion Type) Parts: 1. Converter 2. Screw rod 3. Encloser 4. Seat for inserted rod 5. Ball valve 6. Inserted rod 7. Vortex transducer 8. Vortex transducer 9. Hand handle 10. Guide rod 11. Scale 12. R=1/2 inner diameter of the pipe (DN<800) R=0.121 inner diameter of the pipe (DN 800) 34

35 Note: Above information is just for reference, mm for unit. Installation of Adjustable Insertion Transducer Installation Procedures: 1. Drill a hole in the customer's pipe by method of torch cutting, with diameter slightly less than Φ100, no burr at the edges of the hole to make the measuring probe inserted through it freely. 2. Weld a matched short-duct (supplied by Kent) on the hole on the pipe by spot welding, the axes line of the short-duct is perpendicular 90º to the one of the pipe, as well as its extending line is through the circle center of cross-section of the pipe, then welding all-around. 3. First install ball-valve (Q41F-16R-32R, ID 100mm, supplied by customer), then install transducer on the valve. 4. Calculate inserted deep R, measure the length of the short duct and ball valve, adjust screw rod to make the inserted deep is conformed with the specification. 5. Check all if it is good, open valve slowly and check the leakage (care of personnel safety). Caution: 1. Flow direction must be conformed with the flow arrow on the meter body; 2. When weld the flange and pipe, the transducer should not be installed on the pipe to avoid any damage of the transducer. Application Precaution for Explosion Proof Vortex Flow Transducer Divide category of hazardous area correctly; Select and install proper explosion proof vortex meter; maintain and repair in time and correctly. Division of hazardous area, selection, installation and maintenance and so on must be conformed to safety standard system such as GB , GB , and GB etc. Make sure that selection is conformed to design (including vortex meter model and specification, power grade, protection grade, installation type, explosion proof mark, cable, thread etc.) Confirm installing site and leave sufficient space and path around meter. Following factors should be considered: convenient usage, operation, running, repair& maintenance, disposal of urgent matters (urgent power off) etc. Avoid disadvantage factors such as stream, raining, thunder, moisture, thermal radiation, high temperature object, 35

36 vibration etc. Grounding is one of the most important precautions in meter electrical technology. This connection is to transfer the static charge (static charge generated during fluid transmission, electromagnetic induction, electrostatic induction etc.) to ground. Application Precaution for Flameproof Vortex Flow Transducer This flameproof flowmeter is approved by National Supervision and Inspection Center for Explosion Protection and Safety of Instrumentation (NEPSI), according to National Standard GB3896.1/4-2000, mark of flameproof is Exd IIBT3~6. 1. Avoid opening wiring box and inlet wire box of flameproof vortex flowmeter for daily maintenance. Cut off power before open. If open the flameproof housing, flameproof surface should be protected with no damage. Put flameproof surface upwards and can not touch the earth directly when check. 2. Non-flameproof meter and lamp fixture etc. are not allowed for maintenance on site. All tools should be flameproof. 3. Grounding terminal is available on housing. Meter should be grounded reliably while operation. Application Precaution for Intrinsical Safe Vortex Flow Transducer This intrinsical safe meter is approved by National Supervision and Inspection Center for Explosion Protection and Safety of Instrumentation (NEPSI), according to National Standard GB3896.1/4-2000, mark of explosion proof is ExibIICT3~6. It combined with safety barrier to make up an intrinsical safe explosion proof system, which can be used in relevant hazardous areas. You need to care of follows before installation: 1. There is grounding terminal in meter housing, you must ground the meter reliably; 2. This intrinsical safe meter must be combined with safety barrier which must be approved by Organization of Explosion Proof Inspection to make up intrinsical safe system; 3. The three cores shielded cable (core cross section is 0.5mm 2, with insulating sheath ) be used for connecting between meter to safety barrier, the shielded layer be single-end grounded in non-hazardous area. Cable layout should eliminate the electromagnetic interference as possible and make the cable distribution capacitance within 0.05F; 4. Ambient temperature range: 25 ~ +60. The relationship between temperature levels of explosion proof mark and inflame temperature as below: Temperature Level T1 T2 T3 T4 T5 T6 Inflame Temperature 450<t 300<t <t <t <t <t The safety barrier should be installed in non-hazardous areas and operation should be according to the operation instruction; 6. Customer should not change the electric elements by himself; 7. Must obey the regulations of National Standard GB while installation and maintenance. 36

37 Configuration of Intrinsical Safe System Safety barrier is zener or insulated type; please connect vortex flowmeter, flow calculator and safety barrier according to safety barrier instruction. Appendix. 1 Measuring Principle of Vortex Flow Transducer 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=sr.v/d Thereinto f----frequency of Karman Vortex shedding Sr----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 KVFN Vortex Flowmeter, its frequency of the vortex shedding was detected by the stress force which exerted 37

38 on the sensor (probe) using the piezoelectric unit which is built in sensor. Appendix. 2 Amplifier Circuit Circuit Diagram 1. Electric charge converter 2. Amplifier 3. Lowpass filter 4. Smith trigger 5. Stabilized voltage supply 6. Output amplifier 7. Power supply 1. Electric charge converter 2. Amplifier 3. Low-pass filter 4. Smith trigger 5. F/V converter 6. Stabilized voltage supply 7. V/I converter 8. Power supply 9. Load resistor Electric charge converter Convert the alternating charge from piezoelectric unit into voltage, which is proportional to quantity of the charge. Alternating amplifier and low-pass filter Amplify signal and eliminate noise. When the velocity is low, high frequency noise produced from pipe vibration may be superposed on the output wave of charge converter to form a superposed wave. When high velocity, differential pulsed signal forms a wave involved low frequency swing. At low velocity (small output voltage), high 38

39 frequency noise be eliminated by lowpass filter, and at high velocity (large output voltage), along with the lowpass feature be released and its feature of amplitude limit to appear, to prevent the signal from amplifying low frequency noise. Smith trigger Convert the detected voltage of the vortices frequency into pulse signal with a range of amplitude. Due to circuit of Smith trigger has a hysteretic function to input and output signal, therefore it can prevent oscillating caused by noises. F/V converter Convert pulse signal from Smith trigger output into analog vlotage that is proportional to frequency. V/I converter Convert analog output voltage into 4~20mA DC. Pulse output amplifier Amplify pulse frequency signal from Smith trigger. 39

40 Appendix. 3 Gas Character & Essential Data 40

41 Appendix. 4 Density of Overheated Steam( 1) (unit: kg/m 3 ) 41

42 Appendix. 4 Density of Overheated Steam( 2) (unit: kg/m 3 ) 42

43 43

44 Appendix. 5 Density of Saturated Steam (unit: kg/m 3 ) 44

45 Saturated steam density table: density ρ(kg/m3); Absolute pressure P ( MPa); temperature t ( ) 45

46 SHANGHAI KENT INTELLIGENCE METER CO., LTD. Add: 5553 Hutai Rd., Shanghai , China Tel: Fax: Http: //