YYW Differential Vortex Flow MeterDetailed product description：

YYW differential vortex flowmeter is a primary instrument used to measure the flow of liquid, gas, and steam in pipelines. It is a new type of intelligent flow meter based on the principle of Karman vortex street, with on-site LCD display function and variable output current signal or frequency signal for recording, adjustment, and control. YYW differential vortex flowmeter can be divided into full tube type, insertion type, and separation type according to different usage scenarios. In situations where it is inconvenient to provide power, battery powered low-power intelligent on-site display types can be selected. The YYW differential vortex flowmeter adopts embedded technology, which can measure signals such as flow rate, pressure, temperature, etc. It has nonlinear correction function and adopts RS-485 communication interface and MODBUS communication protocol, making it very convenient for networking. The transmission function of YYW differential vortex flowmeter is suitable for various distributed control systems and can also be combined with an upper computer to form a flow data acquisition system.

Performance characteristics
Two pairs of four piezoelectric crystal elements form a differential structure, which improves the vibration resistance and signal-to-noise ratio of the instrument

Extend the lower limit of flow velocity measurement to achieve low lower limit flow measurement;
It has the function of tracking and compensating for the temperature and pressure of the measured medium, and can accurately measure the mass flow rate of the medium;
Environmental conditions: ambient temperature -40 to+60 ℃; Relative humidity ≤ 85% RH;
Medium temperature: -40 to+300 ℃;
Flow rate range: liquid 0.5-7m/s, gas 5-50m/s, steam 5-70m/s;
Measurement accuracy: Full tube ± 1.0%, insertion ± 2.5%;
Power supply voltage: locally displayed 1.5-3.6V battery
Two line output 18-26V.DC
Pulse output 12-24V DC
Output signal: 2-wire 4-20mA analog current (load resistance ≤ 75O Ω);
Voltage pulse (load resistance ≥ 10k Ω)
RS-485 communication output
Fluid pressure: 0-4MPa (DN25-DN100);
O～2.5MPa（DN125～DN2000）
Intrinsic safety explosion-proof: explosion-proof mark Exia Ⅱ CT3-6, explosion-proof certificate number GYB00495, associated equipment LB902, LB902R
Explosion proof mark Exia Ⅱ CT2-5, explosion-proof certificate number GYB97131, associated equipment LB867, LB967
Explosion proof: Explosion proof mark Exd Ⅱ BT2-5, Explosion proof certificate number GYB00567
Factory inspection: The flowmeter is calibrated and qualified by the flow standard device before leaving the factory
Shell material: lCrl8Ni9Ti
Electrical connection: M20 × 1.5 internal thread, Φ 10 cable hole
Shell protection: IP65
Specifications: Full tube DN25-DN250, plug-in DN200-DN2000

Instrument selection
Key selection points
To ensure that the flowmeter operates under good characteristics, the following points should be noted when selecting a flowmeter:
1. The diameter of the flowmeter should be as small as possible to obtain a larger flow range and velocity;
2. The working pressure and temperature range of the tested medium should be within the technical parameter range;
3. The pressure loss coefficient Cd of the flowmeter is ≤ 2.4, and the flow pressure loss under working conditions can be estimated according to the following formula
ΔP =1.2×10-6ρV2
Δ P in the formula: pressure loss (MPa)
ρ: Fluid density under working conditions (kg/m3)
V: Flow velocity (m/s)
4. When the measuring medium is liquid, in order to prevent vaporization and cavitation, the minimum working pressure of the flowmeter should meet the following requirements:
P≥2.6ΔP＋1.25P0
In the formula, P: minimum working pressure (MPa)
Δ P: Calculated value of pressure loss (MPa)
P0: Saturated vapor pressure of liquid (MPa)

Reference flow range

Caliber mm	Flow range (m)three/h）			Caliber mm	Flow range (m)three/h）
	liquid	gas	steam		liquid	gas	steam
twenty-five	0.8～12	7.2～60	12~120	three hundred	150~1500	1000~10000	1780~17800
thirty-two	1.5～20	13~100	20~200	four hundred	270~2700	1800~18000	3160~31600
forty	2~30	18~150	30~300	five hundred	420~4200	2800~28000	4950~49500
fifty	3~45	30~240	50~500	six hundred	610~6100	4070~40700	7120~71200
sixty-five	6.5～84	54~420	84~840	seven hundred	830~8300	5540~55400	9700~97000
eighty	10~130	70~600	120~1200	eight hundred	1090~10900	7230~72300	12700~127000
one hundred	20~200	120~1000	200~2000	nine hundred	1370~13700	9160~91600	16000~160000
one hundred and twenty-five	32~320	200~1600	320~3200	one thousand	1700~17000	11300~113000	19800~198000
one hundred and fifty	45~450	240~2000	440~4400	one thousand and two hundred	2440~24400	16300~163000	28500~285000
two hundred	90~900	480~4000	900~9000	one thousand and five hundred	3800~38000	25400~254000	44500~445000
two hundred and fifty	120~1200	700~8000	1200~12000	two thousand	7000~70000	48000~480000	80000~800000

Selection Table (Simply select each item from top to bottom to obtain the complete model)

YYW

Vortex flowmeter series

code

Detection category

A

Differential type

code

measuring medium

one

gas

two

liquid

three

steam

code

Nominal diameter of flowmeter

DN25

DN25

DN32

DN32

┇

DN125

DN125

DN150

DN150

DN200

DN200

DN250

DN250 (insert type below)

DN300

DN300

┇

DN2000

DN2000

code

power supply

D

DC 24V power supply

T

Battery powered (only for local display with no signal output)

code

Display the header in place (option)

X

Intelligent LCD display screen

code

Supporting pressure and temperature sensors (only temperature and pressure compensation table options available)

P

pressure

T

temperature

Q

Pressure and temperature

code

output signal

Ⅲ

Two line system with 4-20mA output

I

Three wire voltage pulse output

T

RS485 communication output

code

Pipeline connection method (full pipe option only)

R

flange type

code

Header combination type (option)

L

Header separation type

code

Ball valve (insert only option)

Z

Install ball valve

code

Explosion proof mark (option)

B

Intrinsic safety explosion-proof

d

flameproof

YYWA 1DN100D X Q Ⅲ R -- B Selection Example

The model must be filled in completely and clearly for accurate supply;  
Go to YYW capacitive vortex flowmeter
The option bar code is only to be filled in when needed;
Integrated installation of pressure and temperature sensors and flow meters for pressure and temperature compensation gauges; When the measuring medium is steam, the pressure sensor must be installed on the pipeline.