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technical article
Smart target flowmeter overview
2012-1-27 19:35:01

Overview:

A new generation of intelligent target type flowmeter, which integrates flow, temperature and pressure detection functions, adopts advanced single-chip microcomputer technology and capacitive pressure sensor. The product has no moving parts, and has strong anti-vibration, anti-impurity and anti-interference capabilities;

It has a series of features such as simple operation, easy installation, maintenance-free, self-checking of failure, and low running cost. Has been widely used in semi-water gas, coke oven gas, heavy oil, residue measurement, asphalt, liquid paraffin, toluene, sulfuric acid, natural

The measurement of gas, methane chloride, flue gas, chlorine gas, sewage, pure water and other special media has solved the difficult flow measurement in the industry for many years. working principle:

When the medium flows in the measuring tube, due to its own kinetic energy and pressure difference between the target plate, the force on the target plate is generated, causing the target plate to generate a small amount of displacement. The magnitude of the force is proportional to the square of the flow velocity of the medium. Target

The applied force is transmitted through the target rod, which causes a slight change in the sensor's elastic body, thereby breaking the bridge balance composed of the chip capacitor. Generates a voltage signal corresponding to the force of the flow on the target: affected by the characteristics of the fluid flow,

The flow is proportional to the square of the voltage generated by the bridge.

Features:

整台仪表在设计中无可动部件,插入式结构,拆卸方便; The whole instrument of the intelligent target type flowmeter has no moving parts in the design, and the plug-in structure is convenient for disassembly;

Can choose a variety of anti-corrosion and high and low temperature resistant materials (such as Hastelloy, titanium, etc.);

The whole machine can be made fully sealed without dead corners (welded form), without any leakage points, and can withstand 42MPa high pressure;

Self-checking procedures are set up in the table, and the failure phenomenon is clear at a glance;

The sensor is not in contact with the measured medium, there is no component wear, and it is safe and reliable to use;

The dry calibration method can be used in situ, that is, the weight hanging method is adopted. One-button operation can complete the calibration;

Selectable small signal removal, non-linear correction, filtering time can be selected;

Integrated temperature and pressure compensation, direct output quality or standard square;

There are multiple installation methods to choose from, such as online plug-in, low installation costs;

It can accurately measure the gas and liquid flow under various normal temperature, high temperature 500 degrees, and low temperature -200 degrees;

Accurate measurement, accuracy can reach 0.2%;

Good repeatability, generally 0.05 ~ 0.08%, fast measurement;

Low pressure loss, only about 1/2 △ P of standard orifice plate;

Strong anti-interference and anti-impurity ability;

The flow blocking range (target) can be changed according to actual needs to change the flow range;

Low-power battery on-site display, can directly read the displayed value online, and the display can simultaneously read the instantaneous and cumulative flow and percentage bar graph

Simple and convenient installation and extremely easy maintenance;

Multiple output formats, can transmit various parameters remotely;

Strong vibration resistance, pulsating flow can be measured within a certain range;


,集流量、温度、压力检测功能于一体,采用先进的单片机技术和电容式压力传感器,产品无可动部件,抗振动、抗杂质、抗干扰能力 A new generation of intelligent target type flowmeter , which integrates flow, temperature and pressure detection functions, adopts advanced single-chip microcomputer technology and capacitive pressure sensor. The product has no moving parts, anti-vibration, anti-impurity and anti-interference ability

Strong; It has a series of features such as simple operation, easy installation, maintenance-free, self-test failure, and low operating costs. Has been widely used in semi-water gas, coke oven gas, heavy oil, residue measurement, asphalt, liquid paraffin, toluene, sulfuric acid,

The measurement of natural gas, methane chloride, flue gas, chlorine gas, sewage, pure water, and other special media has solved difficult flow measurement in the industry for many years.

working principle:

When the medium flows in the measuring tube, due to its own kinetic energy and pressure difference between the target plate, the force on the target plate is generated, causing the target plate to generate a small amount of displacement. The magnitude of the force is proportional to the square of the medium flow velocity Target

The applied force is transmitted through the target rod, which causes a slight change in the sensor's elastic body, thereby breaking the bridge balance composed of the chip capacitor. Generates a voltage signal corresponding to the force of the flow on the target: affected by the characteristics of the fluid flow,

The flow is proportional to the square of the voltage generated by the bridge.

Technical performance characteristics of intelligent target flowmeter:


1. It can accurately measure the flow rate of various liquids, gases, vapors, viscous liquids and other liquid media under the working conditions of temperature range -40 ° C to 450 ° C and pressure range 0.6 to 42MPa;


2. Very high sensitivity, can measure ultra-small flow, the lowest flow rate can reach 0.08m / s


3. No moving parts, the sensing strain gauge is non-contact with the measured medium, and it is safe and reliable to use;

4. Accurate measurement and high accuracy, the total measurement accuracy can reach 0.2%;


5. Wide measurement range, the maximum measurement range can reach 1:30;

6. Good repeatability, generally 0.05 ~ 0.08%, fast measurement;


7. Small pressure loss, only about 1/2 △ P of standard orifice flow;


8. Strong anti-interference and anti-impurity capabilities;


9. The target plate can be changed according to actual needs to change the flow measurement range;


10. Dry calibration method can be adopted, that is, the method of hanging weight by method code;

11. On-site calibration is simple and convenient;


12. With online reading indication and remote transmission function;


13. Simple and convenient installation and extremely easy maintenance.

工作原理 Intelligent target flowmeter works


When the medium flows in the measuring tube, the pressure difference caused by its own kinetic energy passing through the blocking member (target), and has a force on the blocking member. The magnitude of the force is proportional to the square of the velocity of the medium. The mathematical way is as follows:
F = CdAρ · V2 / 2


In the formula: F —— the force of the choke (kg)

Cd-object resistance coefficient


A ——Axial projection area of the choke on the measuring tube (mm2)


ρ-medium density (kg / m3)


v-average flow velocity of the medium in the measuring tube (m / s)


The force F received by the choke (target) is transmitted to the capacitive force sensor via a rigidly connected transmission (stem).


Capacitive force sensor generates voltage signal output: V = KF


In the formula: V——Voltage (mV) output by the capacitive force sensor,


K——proportional constant,


F-the force on the choke (target) (kg)


Product parameters of smart target flowmeter


Caliber: DN15 ~ DN3000mm


Nominal pressure: 0.6 ~ 42MPa

Working temperature: -200 ℃ ~ + 500 ℃


Accuracy: ± 0.5 ~ ± 1.5% FS


Range ratio: 1:15


Shell: carbon steel; stainless steel (or provide according to user requirements)


Power supply: built-in 3.6VDC lithium battery (replace every two years without signal output); external supply 24VDC (with signal output)

Output signal: 4 ~ 20mA two-wire system; pulse 0 ~ 1000HZ; RS232 / RS485 (or provide according to user requirements)


Protection level: IP65; IP67


Explosion-proof mark: intrinsically safe ExiallCT4; flameproof ExdllCT4


Executive standard: Q / BET05-06


Meter head shows: cumulative flow; instantaneous flow; working temperature; working pressure (only in temperature and pressure compensation type); rod full scale percentage; fault self-test

Connection form: flange pipe type


Typical application of intelligent target flowmeter


1. Gas: gas, air, hydrogen, natural gas, nitrogen, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, chlorine, etc. 2. Liquids: heavy oil, paraffin, asphalt, edible oil, residue, diesel,

Mine water, detergent, soy sauce, gasoline, silicone oil, syrup, solvent, perfume, sea water, aviation kerosene, soap ketone water, glucose, canolaic acid, brine, paste, ink, coolant, glycol, mineral oil, liquid sugar,,

Automotive coatings, resins, butter, rapeseed oil, liquid oxygen, shampoo, toothpaste, gel, fuel oil, milk, bleach, conditioner, soda, additives, cleaning agents, alkaline, ammonia, marine oil, chemical reagents, Kerosene, dye, water,

Nitric acid, high boiling point organic solution, lard, alcohol, oil, ethylene, polypropylene, methylbenzyl, etc.


3. Steam: Superheated steam, saturated steam.


Product Features of Intelligent Target Flowmeter


The whole instrument has no moving parts in the design, and the plug-in structure is easy to disassemble.

Can choose a variety of anti-corrosion and high and low temperature resistant materials (such as Hastelloy, titanium, etc.)

The whole machine can be made fully sealed without dead corners (welded form), without any leakage points, and can withstand 42MPa high pressure

The instrument has a self-checking program, and the failure phenomenon is clear at a glance.

The sensor is not in contact with the measured medium, there is no component wear, and it is safe and reliable to use

The dry calibration method can be used in situ, that is, the weight hanging method is adopted. One-button operation for calibration

Multiple installation methods to choose from, such as online plug-in, low installation cost

With integrated temperature and pressure compensation, direct output quality or standard

Optional small signal removal, non-linear correction, and filtering time

Can accurately measure the gas flow rate under various normal temperature, high temperature 500 degrees, and low temperature -200 degrees

Accurate measurement, accuracy can reach 0.2%


Good repeatability, generally 0.05 ~ 0.08%, fast measurement

Low pressure loss, only about 1/2 △ P of standard orifice plate

Strong anti-interference and anti-impurity

Change the flow range (target) according to actual needs and change the flow range

Low-power battery on-site display, can directly read the displayed value online, and the screen can simultaneously read the instantaneous and cumulative flow rate and percentage bar graph

Simple and convenient installation and easy maintenance

Multiple output formats, can transmit various parameters remotely

Strong vibration resistance, pulsating flow can be measured within a certain range


产品连接形式及型号说明 Intelligent target flowmeter product connection form and model description


1. Intelligent target flowmeter category


Liquid flow meter: high temperature and normal temperature


Gas flow meter: high temperature and normal temperature

2. Intelligent target type flowmeter form and corresponding specifications

Clip-on type Corresponding specifications