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Vortex Flow Meter-temperature compensation

plum in a triangular prism (occurrence of the whirl) to the body. When there is a flow of fluid, the opposite direction systematic of Carmen whirl will be generated behind of the triangular prism. vortex shedding frequency F is in proportion to the rate of the flow V. detect the Nos of the vortex through sensor probe, then the rate of flow will be calculated. And then calculate the fluid volume and flow rate according to the diameter.

Computing formula as follows:

F=St*V/(1-1.27*d/D)¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­formula 1

Q=3600*F/K¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­ formula 2

M=Q*p¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­formula 3

l  F¡­¡­the vortex frequency cause when fluid flow through the triangular.(unit: Hz)

l  St¡­¡­strouhal constant

l  V¡­¡­the speed of flow in the tube(m/s)

l  d¡­¡­width of triangular in body of vortex

l  D¡­¡­vortex diameter(unit: m)

l  Q¡­¡­instantaneous volume flow rate(unit:m3/h)

l  K¡­¡­vortex factor(unit: pulse quantity/m3)

l  M¡­¡­instantaneous(unit: kg/h)

l  P¡­¡­the fluid density(kg/m3)

Different diameter vortex sensor, the meter factors are different. The value is settable through set flow rate. The action is to set the pulse quantity per cubic meter.

Physical parameter
Nominal diameter: LUGB-A filled vortex flow meter ¦µ 10-¦µ 500
LUGB-B plug-in type vortex flow meter¦µ 200-¦µ 2000
Measuring fluid: Liquid, gas, saturated vapor, super-heated steam
Standard condition: P=0.101325MPa T=20º C
Suitable environment temperature: -20º C~+55º C
Atmospheric pressure: 86KPa~106KPa
Relative humidity: 5%~95%
Fluid temperature: For filled vortex flow meter: -40~+42º C; For plug-in vortex flow meter: -40~+250º C
Pressure class: PN 1.0MPa, PN1.6MPa, PN2.5MPa, PN4.0MPa
LUGB A clamp-on vortex flow meter's flanges pressure are all PN2.5MPa, and their direct flange-connecting are PN1.0MPa pressure flange.
And LUGB-B plug vortex flow meter's flanges are all PN1.6Mpa bearing pressure as normal when out of factory. So if the needed pressure is larger than the stated pressure, advanced notification is necessary.
Accuracy class: LUGB-A 1class, 1.5class (0.5class and 0.2class can be negotiation)
LUGB B 2.5class (1.5class and 1.0class can be negotiation)
Vortex flow meter's largest measuring range refer to table 2, table 3, table 4, table 5, table 6 and table 7.
Digit intelligent vortex flow meter's measuring range: Liquid (0.30m/s~8.0m/s), gas, steam(2.8m/s~6.5m/s)
Anticorrosion class: Exia IICT4 explosion-proof type and ExdIICT5 flame-proof type.
Protection class: IP54, IP65
Body material: 1Cr18Ni9Ti(if other material is required, negotiation firstly)

3.2 electric factors
Working voltage: 12VDC, 24VDC, 3.6VDC Lithium battery (battery life is more that 2years. Only for field display)
Output signal
Voltage pulse of working condition instantaneous flow rate(low level¡Ü 1V, high level¡Ý 6V, pulse width10uS)
Voltage pulse for instantaneous flow rate on standard condition (limits to temperature and pressure integrative compensation type vortex flow meter. Low level¡Ü 1V, high level¡Ý 6V)
Working condition instantaneous flow rate is corresponding to 2-wire 4~20mA output (limit to temperature and pressure compensation integration type vortex flow meter, 3-wire system 4~20mA output)
Standard instantaneous flow rate is corresponding to 3-wire 4~20mA output (limited to temperature and pressure compensation type)
Communication type: RS232, RS485 or HART protocol (these protocol should be negotiated)
Indicating type
Field double rows liquid crystal digit display, can display both instant flow rate and total flow at the same time. For the temperature and pressure compensation type the indicator can display temperature, pressure, instantaneous flow rate and total flow in a cycle. (That is suitable to temperature and pressure compensation type or ordinary display type).
3-row field liquid crystal display: Can display flow rate and total flow at standard condition or temperature, pressure, density, flow rate, total flow, frequency and cell voltage at working condition.

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Tianjin U-ideal Instrument co., ltd is one of esteem company with collection of scientific research, development and sales. We have abundant technical capacity, special scientific research teams with advanced producing and checkout equipment.

Tianjin U-ideal Instrument Co., Ltd produce and sell Magnetic Level Indicator, bi-color quartz glass tubular level gauge, liquid level switch, float switch, level sensor, level transmitter, level switch, tank gauge, water gauge, liquid level instrument, ultrasonic level sensor, flow meter, PD flow meter, oval gear flow meter, dual-rotor turbine flowmeter, duplex rotor meter, vortex flow meter, turbine flowmeter, electromagnetic flowmeter, metal rotary flow meter and valves,oil/water industrial control systems.

We are TIANJIN U-IDEALINDUSTRIES COMPANY , have accumulated abundant experience especially in high temperature and high pressure liquid level meters ,and antiseptic liquid level gauge .we also made to orders of non-standard liquid level meters to satisfy different customers .those products has been used by many enterprises of all walks of chemical,industries, petroleum ,electricity, food, light, medicine, metallurgy, papermaking etc.. and our products have been certified by quality system ISO9001£º2000.

Tianjin U-ideal Instrument Co. are also engaged in flowmeter trade. Such as gas flowmeter and liquid flowmeter with the type of explosion-proof and others.

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