DN100 gas vortex flowmeter | Manufacturer's price 500 yuan

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Overview of Stainless Steel Gas Flow Meter

Stainless steel gas flowmeter is a type of flow meter that uses piezoelectric crystals as detection elements and outputs a standard signal proportional to the flow rate. It can be used in conjunction with computers and distributed systems to measure flow parameters of different media. The stainless steel gas flowmeter is based on the detection principle of fluid vortex street. The piezoelectric crystal used to detect the vortex street does not come into contact with the medium. The instrument has the characteristics of simple structure, good universality, and high stability

Stainless steel gas flow meters can be used for flow detection and measurement of various gases, liquids, and vapors. Stainless steel gas flow meters can be used in conjunction with intelligent flow integrators and have strong versatility. Referring to the usage environment and special requirements, stainless steel gas flow meters are available in various specifications, including universal stainless steel gas flow meters, plug-in stainless steel gas flow meters, integrated stainless steel gas flow meters, explosion-proof stainless steel gas flow meters, temperature compensated integrated stainless steel gas flow meters, and other products.

Working principle of stainless steel gas flowmeter

In a fluid pipeline, inserting a cylindrical barrier vertically will generate vortices alternately on both sides at its rear (relative to the fluid flow direction). As the fluid flows downstream, a vortex column is formed, which we call the Karman vortex street. We define the cylindrical barrier that generates vortices as the vortex generator. Experimental results have shown that under certain conditions, the separation frequency of vortices is linearly related to the flow velocity of the fluid. Therefore, as long as the frequency of vortex separation is detected, the flow velocity or flow rate of the fluid in the pipeline can be calculated. The stainless steel gas flowmeter is manufactured based on this principle.

Characteristics of Stainless Steel Gas Flow Meter Products

1. Dual row LCD displays both cumulative flow and instantaneous flow simultaneously;

2. Powered by internal lithium batteries, no external power supply required;

3. Micro power consumption design, two+3V lithium batteries can work continuously for more than one and a half years;

4. The sensor has no movable parts inside, a simple and sturdy structure, low pressure loss, small expansion capacity, and long service life.

5. Accuracy level: Liquid, ± 1.0% of indicated value; Gas, with an indication value of ± 1.0%; Steam, with an indication value of ± 1.5%.

6. Output signal: Gate pulse output; b. Current 4-20mA (two-wire/three wire system).

7. Power supply voltage:+24vdc (provided when signal output is required).

8. Medium temperature: ordinary type a. -40 ℃~+130 ℃; b.-10℃～+250℃;

Parameters of stainless steel gas flowmeter

1. Caliber: DN15~DN3000mm

2. Nominal pressure: 0.6-42MPa

3. Operating temperature: -180~+500 ℃

4. Accuracy: ± 1.5% FS

5. Output signal: 4-20mA two-wire system; Pulse frequency range of 0-1000Hz; RS232/RS485 (or to be provided upon user request)

6. Protection level: IP65 IP67

7. Explosion proof mark: intrinsic safety type ExiallCT4; Explosion proof ExdllCT4

8. Execution standard: Enterprise standard Q/BET05-06

9. Header display: Accumulated traffic; Instantaneous flow rate; Operating temperature; Operating pressure (only available with temperature pressure compensation); Rod shaped full-scale percentage; Fault self check

10. Nominal diameter: card type: DN10~DN300; Insertion type: DN350~DN1000; Flange type: DN10~DN3000

Flow range of stainless steel gas flowmeter

Installation dimensions of stainless steel gas flowmeter

Wiring Design of Stainless Steel Gas Flow Meter

One Wiring Design of Three Wire Stainless Steel Gas Flow Meter for Output Frequency Signal

The three wire flow sensor that outputs frequency signals is powered by DC24V or DC12V power supply, and is generally connected to the display instrument or computer through a three core shielded cable (RWP3 × 0.5mm). The shielding layer should be reliably connected to the grounding screw of the amplifier housing. The selection of shielded cables should be suitable for the on-site environmental requirements. In addition, shielded cables should be separated from other high-power power lines and cannot be wired in parallel. Sensor terminal wiring diagram

II Wiring Design of Two Wire Stainless Steel Gas Flow Meter with Output Standard 4-20mA Current Signal

The two-wire transmitter that outputs a standard 4-20mA current signal is powered by a DC24V power supply and is generally connected to a display instrument or computer through a two core shielded cable (RWP3 × 0.5mm). The shielding layer should be reliably connected to the grounding screw of the amplifier housing. The selection of shielded cables should be suitable for the on-site environmental requirements. In addition, shielded cables should be separated from other high-power power lines and cannot be wired in parallel. The wiring of the transmitter terminal is shown in the diagram

3、 Wiring Design of Stainless Steel Gas Flow Meter with RS-485 Communication Interface Function

The stainless steel gas flowmeter with RS-485 communication function is powered by a DC24V power supply and transmitted to other devices using a four wire system. Refer to the diagram for the wiring of instrument terminals

4、 Wiring Design of Riot proof Vortex Flow Meter

The LUGB/E three wire pulse output vortex flowmeter is connected to the LB978 Zener safety barrier, and the LUGB/E two-wire standard 4-20mA current output vortex flowmeter is connected to the LB987S Zener safety barrier to form an intrinsic safety explosion-proof system. The explosion-proof mark of the product is Ex ia Ⅱ CT2-T5. Please refer to the wiring instructions provided by the explosion-proof safety barrier manufacturer and the following diagram for the wiring of intrinsically safe explosion-proof vortex flow sensors/transmitters and related equipment such as explosion-proof safety barriers and integration systems

matters needing attention:

(1) Explosion proof sensors and transmitters must be installed in hazardous areas, while safety barriers, display instruments, power supplies, computers, and other related equipment must be installed in safe locations.

(2) Sensors and transmitters should have reliable grounding, and explosion-proof grounding wires should not be shared with the protective grounding of the high-voltage system.

Product spectrum of stainless steel gas flowmeter

Installation of Stainless Steel Gas Flow Meter

Installation instructions

(1) Stainless steel gas flow meters should be installed as far away as possible from vibration sources and areas with strong electromagnetic interference. Vibration reduction devices must be used in areas where vibration exists to reduce the impact of pipeline vibration.

(2) The configuration of the straight pipe section, the front and rear straight pipe sections must meet the requirements of the stainless steel gas flowmeter, and the inner diameter of the pipeline must also be consistent with the inner diameter of the vortex flow transmitter.

(3) Installation diagram

precautions

Try to minimize the impact of the steam hammer inside the pipeline on the vortex generator. When the vibration is large and cannot be eliminated, stainless steel gas flow meters should not be used.

Commissioning instructions

1. Connect the signal line and power line

2. Open the inlet and outlet valves, and ensure that the opening of the inlet and outlet valves is consistent

3. Open the stainless steel three valve group balance valve, slowly open the valves at the high and low pressure ends of the orifice plate, and close the stainless steel three valve group balance valve after the fluid passes through the flowmeter.

Installation pipeline conditions:

(1) The straight pipe section before and after the throttling element must be straight and there must be no visible bending.

(2) The straight pipe section used for installing throttling components should be smooth. If it is not smooth, the flow coefficient should be multiplied by the roughness to correct for sparsity.

(3) To ensure that the fluid flow forms a fully developed turbulent velocity distribution 1D in front of the throttling element, and to make this distribution uniformly axisymmetric

1) The straight pipe section must be circular, and the roundness requirements for the 2D range of the throttling element are very strict, with certain roundness indicators. Specific measurement method:

(A) Measure the inner diameters of at least four pipes on four vertical pipe sections OD, D/2, D, and 2D in front of the throttling element at equal angular distances, and take the average value D. The difference between any single measurement value of the inner diameter and the average value shall not exceed ± 0.3%

(B) After the throttling element, 8 single inner diameter measurements were taken using the above method at the OD and 2D positions. Any single measurement compared to D should not deviate by more than ± 2%

2) A sufficiently long straight pipe section is required before and after the throttling element, which is related to the form of the local resistance element in front of the throttling element and the diameter ratio β.

(4) The length of the straight pipe section between the upstream resistance element and the second resistance element of the throttling element can be taken as half of the listed value in the form of the second resistance element and β=0.7 (regardless of the actual β value)

(5) When the upstream side of the throttling element is an open space or a large container with a diameter ≥ 2D, the length of the straight pipe between the open space or large container and the throttling element shall not be less than 30D (15D). If there are other local resistance components between the throttling element and the open space or large container, in addition to the small straight pipe section length 1 specified for attachment between the throttling element and the local resistance component, the total length of the straight pipe section from the open space to the throttling element shall not be less than 30D (15D)）.