Steam flow meter steam flow meter 0517-86903858 13770422667
First, the principle of steam flow meter
When a triangular column type vortex generator is provided in the fluid, two rows of regular vortices are alternately generated from both sides of the vortex generator, and this vortex is called a Karman vortex street, as shown in Fig. 1 .
A capacitance detecting type vortex flow/sensor or a piezoelectric detecting type vortex flow sensor can be formed by incorporating a capacitance detecting probe or a piezoelectric detecting probe and a corresponding matching circuit in the vortex generating body.
Figure (I) The vortex arrays are arranged asymmetrically downstream of the vortex generator. Let the frequency of occurrence of the vortex be f, the average velocity of the flow of the measured medium is V, the width of the vortex generating body is d, and the diameter of the body is D. According to the principle of Karman vortex, the following relationship is obtained:
f=St.V/[(1-1.25d/D)d]
Where: f-the Karman vortex frequency generated on the side of the generator
St-Strohar number
Average flow rate of V-fluid
D-column flow width
D-pipe inner diameter
Figure (2) In the straight part of St=0.17 in the curve table, the release frequency of the vortex is proportional to the flow velocity, which is the measurement range of the vortex flow sensor. As long as the frequency f is detected, the flow velocity of the fluid in the tube can be obtained, and the volume flow rate can be obtained from the flow velocity V.
Q=3600f/K or M=Ï3600 f/K
Where: K = meter constant (1/m3).
M = mass flow
Q = volume flow (m3 / h)
Ï = medium density (kg / m3)
F = frequency Hz
Second, the steam flow meter technical parameters
Nominal diameter (mm) | 15,20,25,32,40,50,65,80,100,125,150,200,250,300, (300-1000 plug-in) |
Nominal pressure (MPa) | DN15-DN200 4.0 (>4.0 agreement supply), DN250-DN300 1.6 (>1.6 agreement supply) |
Medium temperature (°C) | Piezoelectric type: -40 to 260, -40 to 320; Capacitive type: -40 to 300, -40 to 400, -40 to 450 (contract order) |
Body material | 1Cr18Ni9Ti, (available under other materials agreement) |
Allowable vibration acceleration | Piezoelectric type: 0.2g Capacitance type: 1.0 to 2.0g |
Accuracy | ±1%R, ±1.5%R, ±1FS; Insertion: ±2.5%R, ±2.5%FS |
Range | 1:6~1:30 |
Supply voltage | Sensor: +12V DC, +24V DC; Transmitter: +12V DC, +24V DC; Battery powered: 3.6V battery |
output signal | Square wave pulse (excluding battery-powered type): high level ≥ 5V, low level ≤ 1V; current: 4 ~ 20mA |
Pressure loss coefficient | Meet the JB/T9249 standard Cd ≤ 2.4 |
Explosion-proof mark | Intrinsically safe type: ExdIIia CT2-T5 flameproof type: ExdIICT2-T5 |
Protection level | Ordinary IP65 diving IP68 |
Environmental conditions | Temperature -20 ° C ~ 55 ° C, relative humidity 5% ~ 90%, atmospheric pressure 86 ~ 106kPa |
Applicable medium | Gas, liquid, steam |
Transmission distance | Three-wire pulse output type: ≤300m, two-wire standard current output type (4~20mA): load resistance ≤750Ω |
Third, product selection
1. Vortex street flow sensor working condition flow range table under reference conditions
1). Gas: normal temperature and normal pressure air, t = 20 ° C, P = 0.1 MPa (absolute pressure), Ï = 1.205 kg / m3, Ï… = 15 × 10-6 m2 / s.
2). Liquid: normal temperature water, t = 20 ° C, Ï = 998.2 kg / m3, Ï… = 1.006 × 10-6 m2 / s.
Instrument diameter (mm) | liquid | gas | ||
Measuring range (m3/h) | Output frequency range (Hz) | Measuring range (m3/h) | Output frequency range (Hz) | |
15 | 0.3 to 6 | 2.2~25 | ||
20 | 0.6~12 | 4 to 50 | ||
25 | 1.2 to 16 | 25～336 | 8.8~55 | 190～1140 |
32 | 1.6 to 30 | 18～130 | ||
40 | 2 to 40 | 10~200 | 27～205 | 140～1040 |
50 | 3 to 60 | 8~160 | 35～380 | 94～1020 |
65 | 5~100 | 60-700 | ||
80 | 6.5～130 | 4.1～82 | 86～1100 | 55～690 |
100 | 15~220 | 4.7 to 69 | 133~1700 | 42～536 |
125 | 25 to 340 | 240 to 2800 | ||
150 | 30~450 | 2.8~43 | 347-4000 | 33～380 |
200 | 45~800 | 2 to 31 | 560～8000 | 22～315 |
250 | 65~1250 | 1.5 to 25 | 890~11000 | 18～221 |
300 | 95～2000 | 1.2~24 | 1360～18000 | 16～213 |
(300) | 100～1500 | 5.5～87 | 1560～15600 | 85～880 |
(400) | 180～3000 | 5.6~87 | 2750～27000 | 85～880 |
(500) | 300~4500 | 5.6~88 | 4300～43000 | 85～880 |
(600) | 450~6500 | 5.7-89 | 6100~61000 | 85～880 |
(800) | 750~10000 | 5.7~88 | 11000～110000 | 85～880 |
(1000) | 1200~1700 | 5.8~88 | 17000～170000 | 85～880 |
>(1000) | protocol | protocol | ||
Note: The (300) to (1000) caliber in the table is plug-in
Fourth, the product spectrum
Spectrum | Description | ||||||||
ZFWJ | Vortex flow meter | ||||||||
G | sensor | ||||||||
Detection the way | B | Piezoelectric sensor | |||||||
E | Capacitive sensor | ||||||||
The way to | DN | 15~1000 | Unit: mm | ||||||
Connection method | 1 | Fully tubular only | Flange connection | ||||||
2 | Fully tubular only | Flange card type | |||||||
3 | Insert type only | Simple insertion type | |||||||
4 | Insert type only | Ball valve insertion type | |||||||
Measuring medium | 2 | liquid | |||||||
3 | gas | ||||||||
4 | steam | ||||||||
Use environment | P | normal type | |||||||
B | Explosion-proof | ||||||||
output signal | 1 | Pulse output | |||||||
2 | 24V, 4~20mA current output, liquid crystal display | ||||||||
3 | RS-485 communication | ||||||||
4 | Battery powered, without temperature, pressure compensation | ||||||||
5 | Temperature and pressure compensation integrated, 24V, 4 ~ 20mA current output type | ||||||||
6 | Temperature and pressure compensation, battery-powered | ||||||||
Selection Description | For example: HLUGE-DN5024P2 full-tube capacitive vortex flow meter, instrument diameter DN50, flange card type connection The medium is steam, common type, 24V, 4~20mA current signal output, liquid crystal display | ||||||||
Five, vortex flowmeter installation requirements:
1. The vortex flowmeter can be installed indoors or outdoors. If installed in a well and flooded, choose a submersible sensor or transmitter.
2. The vortex flowmeter can be installed horizontally, vertically or obliquely on the pipeline, but when measuring liquid, the pipeline must be filled with liquid. Therefore, a vortex flowmeter is installed on a vertical or inclined pipe, and the flow direction of the liquid should be from bottom to top.
3. There should be a long straight pipe section on the upstream side and downstream side of the vortex flowmeter. The required length of the upstream and downstream straight pipe sections varies with the pipe condition. The upstream of the vortex flowmeter should avoid installing the regulating valve or the half-opening valve. The regulating valve or the semi-opening valve should be installed after the 5D downstream of the flowmeter.
4. The inner diameter of the pipe for installing the vortex flowmeter must be the same as the inner diameter of the flowmeter, otherwise it must be reduced.
5. When designing the pipeline, the upper end of the sensor or transmitter should be kept at least 500mm space to facilitate debugging and overhaul.
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