Intelligent digital steam flowmeter

steam flow meter-Sales Line:Manager Bai

1steam flow meterWorking Principle:
vortex flow meter（steam flow meter）The basic principle is the Karman vortex street principle, which states that the separation frequency of vortices in the vortex street is proportional to the flow velocity. The diameter of the transmitter's flow body is basically the same as the nominal diameter of the instrument. As shown in Figure 1, there is an approximately isosceles triangle shaped cylinder inserted into the flow body, with its axis perpendicular to the direction of the measured medium flow and its bottom facing the fluid.

Vortex interlocking separation generates pulsating pressure in the wake on both sides and behind the cylinder. The detection probe located inside (or behind) the cylinder is subjected to this tiny pulsating pressure, causing the piezoelectric crystal elements embedded in the probe to experience alternating stress and generate alternating charge signals. After undergoing charge transformation, amplification, filtering, limiting, and triggering shaping on the amplifier, the signal outputs a square wave voltage pulse signal with the same frequency as the vortex separation frequency. The signal is then sent to the local display device, and each pulse output by the sensor will represent a certain volume of the measured fluid. The total number of output pulses over a period of time will represent the total volume of fluid flowing through the sensor during that time.

The voltage pulse signal output by the sensor is sent to an integrated local display device. The on-site display instrument adopts the latest low-power CPU to measure the frequency signal output by the vortex sensor, and performs flow calculation based on the set density and vortex flow coefficient. The on-site LCD displays the instantaneous flow rate and cumulative flow rate.

IIsteam flow meterProduct advantages:
Not affected by temperature and pressure, and not easily clogged, stuck, or scaled, resistant to high temperatures and pressures.
▲ Safe and explosion-proof, suitable for harsh environments.
▲ No movable parts, no hollow gaps design, the product is wear-resistant, dirt resistant, does not require mechanical maintenance, and has a long service life.
▲ Adopting low-power high-tech and battery powered on-site display flowmeter, it can operate continuously for more than two years without electricity.
▲Temperature and pressure compensationIntegrated design.
▲ The current output is all electrically isolated, with good common mode interference suppression capability.
▲Simultaneously display temperature, pressure, flow rate, and cumulative flow rate valuesNo need to take turns switching.
▲ Adopting anti vibration probes to effectively eliminate the influence of external vibrations.
The circuit adopts surface mount technology, with a compact structure and high reliability.
▲ Adopting a split type signal converter, with a maximum cable length of 10 meters.
▲ The range ratio is as wide as 20:1.Sales Hotline: Manager Bai
The overall structural design is reasonable, the dynamic measurement range is wide, and the pressure loss is small.
The split type vortex flowmeter is made of stainless steel material and is suitable for measuring corrosive media.
▲ On site LCD display, pulse, 4-20mA output or 485 communication, can be connected to industrial automation systems.

IIIsteam flow meterTechnical Specifications:

steam flow meterProduct selection:

steam flow meterInstallation diagram:

The correct installation of instruments is an important part of ensuring their normal operation. If not installed properly, it can affect the accuracy of instrument use, and in severe cases, it can affect the service life of instruments and even damage them.

(1)Installation environment requirements:

1．Try to avoid strong electrical equipment, high-frequency equipment, and strong switching power supply equipment as much as possible. The power supply of the instrument should be separated from these devices as much as possible.

2．Avoid direct effects of high temperature heat sources and radiation sources. If installation is necessary, insulation and ventilation measures must be taken.

3．Avoid high humidity and highly corrosive gas environments. If installation is necessary, ventilation measures must be taken.

4．Vortex flow meters should be avoided from being installed on pipelines with strong vibrations as much as possible. If installation is necessary, it must be done upstream and downstream2DInstall pipeline fastening devices and add anti vibration pads to enhance the anti vibration effect.

5．It is best to install the instrument indoors. When installing outdoors, attention should be paid to waterproofing, and special attention should be paid to bending the cable at the electrical interfaceUShape to prevent water from entering the amplifier casing along the cable.

6．There should be ample space around the instrument installation point for wiring installation and regular maintenance.

(II)Requirements for Instrument Installation Conditions：

Vortex flow meters have certain requirements for the upstream and downstream straight pipe sections of the installation point, otherwise it will affect the flow field of the medium in the pipeline and affect the measurement accuracy of the instrument. The length requirements for the upstream and downstream straight pipe sections of the instrument are shown in the figure(three)

2The sensor should be installed horizontally or vertically (with the flow of liquid from bottom to top) on the pipeline corresponding to its nominal diameter.

3A flow control valve should not be installed on the upstream side of the sensor.

4If the length of the upstream straight pipe section cannot meet the requirements in the above figure, it is recommended that the user install a fluid rectifier in the upstream pipeline.

5If the pipeline needs to be reduced in diameter, the length of the straight pipe section and the transition pipe should meet the requirements shown in the above figure.

6Do not install sensors on pipelines with strong vibrations to avoid affecting accuracy. If sensors are installed and used on pipelines with vibrations, the following measures can be taken to reduce the interference caused by vibration:

(a)Upstream of the sensor2DInstall pipeline fixed support points at the location.

(b)On the premise of meeting the requirements of the straight pipe section, install excessive hoses.

7When the sensor (transmitter) is installed on a high-temperature pipeline, it must be insulated to prevent thermal radiation from damaging the amplifier.

8There should be no strong magnetic field interference near the flowmeter.

9The flowmeter must be reliably grounded, and the grounding resistance should be ≤10Ω.

10．When measuring high and low temperature media, attention should be paid to insulation measures. The high temperature inside the converter (inside the header housing) should generally not exceed70℃；Low temperature can easily cause condensation inside the converter, reducing the insulation impedance of the printed circuit board and affecting the normal operation of the instrument