Medium temperature insertion target flowmeter-Fornitore globale

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Medium temperature insertion target flowmeter

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Detailed Introduction

1、 Product Overview:

The medium temperature insertion target flowmeter is a new type of capacitive force induction flow target flowmeter developed on the basis of traditional target flowmeters with the development of new sensors and microelectronics technology. It has the characteristics of no movable parts such as orifice plates and vortex street flowmeters, as well as high sensitivity, accuracy comparable to volumetric flowmeters, and a wide range of measurement.

2、 Structure and working principle:

1. Structure:

The medium temperature insertion type target flowmeter mainly consists of a measuring tube (housing), a new type of sensor (including flow blocking element), an accumulation display, and an output part. According to different media and working conditions, suitable sensors must be selected. Therefore, providing accurate measurement objects and parameters by users and selecting appropriate sensors by manufacturers are the key to whether the product can measure accurately.

2. Working principle:

When the medium flows in the measuring tube, the pressure difference generated by its own kinetic energy passing through the blocking element (target flowmeter) exerts a force on the blocking element, and the magnitude of the force is proportional to the square of the medium flow velocity. Its mathematical expression is as follows:

F=CdAρ/V2/2

In the formula: the force acting on the F blocking component (kg)

Cd object drag coefficient

The axial projection area of the measuring tube by the A blocking component (mm2)

Medium density under ρ condition (kg/m3)

The average flow velocity of V medium in the measuring tube (m/s)

The force F received by the blocking element (target) is transmitted to the sensor through a rigidly connected transmission element (measuring rod), and the sensor generates a voltage signal output: V=KF

In the formula: V - voltage output by the sensor (mV), K - proportionality constant

F - the force acting on the flow barrier (target) (kg)

After pre amplification, AD conversion, and computer processing, this voltage signal can obtain the corresponding instantaneous flow rate and cumulative total amount.

3、 Application scenarios:

The medium temperature insertion type target flowmeter is mainly used to solve the flow measurement of high viscosity and low Reynolds number fluids. It has gone through two major development stages: pneumatic meters and electric meters. The intelligent target flowmeter is based on the measurement principle of the original strain gauge target flowmeter and is used for gases such as coal gas, air, hydrogen gas, natural gas, nitrogen gas, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, etc.

4、 Main features:

1. The entire instrument is designed with no movable parts, an insertable structure, and easy disassembly;

2. Multiple anti-corrosion and high/low temperature resistant materials can be selected (such as Hastelloy, titanium, etc.);

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

4. The instrument is equipped with a self checking program, and the fault symptoms are clear at a glance;

5. The sensor does not come into contact with the measured medium, there is no wear on the components, and it is safe and reliable to use;

6. Dry calibration method can be used on-site, namely the weight hanging method. Single key operation can complete calibration;

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

8. Equipped with integrated temperature and pressure compensation, directly output quality or standard square;

9. It has optional small signal removal, non-linear correction, and selectable filtering time;

10. Capable of accurately measuring gas and liquid flow rates under various working conditions of room temperature, high temperature of 500 degrees, and low temperature of -200 degrees;

11. Accurate measurement, with an accuracy of up to 0.2%;

12. Good repeatability, generally 0.05-0.08%, fast measurement;

13. The pressure loss is small, only about 1/2 △ P of the standard orifice plate;

14. Strong anti-interference and anti impurity ability;

15. The flow range can be changed by replacing the blocking element (target) according to actual needs;

16. Low power battery on-site display, capable of online direct reading of readings, and the display screen can simultaneously read instantaneous and cumulative flow rates as well as percentage bar charts;

17. Easy to install and maintain;

18. Multiple output forms, capable of transmitting various parameters remotely;

19. Strong shock resistance, capable of measuring pulsating flow within a certain range;

5、 Technical parameters:

Tested medium: liquid; Gas; Steam;

Nominal diameter: flange type 15-500mm clamp type 15-500mm insert type 65-3000mm;

Nominal pressure: 0．6～42MPa 0.6～42MPa 0.6～42MPa；

Medium temperature: -200 ℃ to+500 ℃ or higher;

Accuracy: ± 0.2% ± 0.5% ± 1.0% ± 1.5%;

Range: 1:3 (liquid) 1:10 (steam) 1:5 (liquid, gas) 1:10 (liquid, gas) 1:10 (steam);

Compensation form: temperature compensation; Pressure compensation;

Repeatability: 0.05% to 0.08%;

Power supply: Equipped with a built-in lithium battery (3.6V); External power supply 24VDC;

Output format: On site display; 4-20mA two-wire system; Pulse 0-5V; RS485/RS232； GPRS wireless remote transmission;

Measurement tube material: carbon steel; stainless steel; It can also be negotiated and provided according to user requirements;

Explosion proof grade: intrinsic safety type (ExiaICT4); Explosion proof type (ExdIICT4);

Protection level: IP65； IP67；

Flange specifications: The flange specifications for the flowmeter connection comply with the GB/T series standards, and can also be specially processed according to user requirements.

6、 Installation precautions:

1. There should be a straight pipe section before and after the measuring tube, and the diameter of the straight pipe section should be equal to the diameter of the flow meter measuring tube. If the diameters are different, a reducer should be used to connect them so that the inlet diameter is the same. The length of the upstream straight pipe section of the flowmeter is generally not less than 6-20D, determined according to different types of upstream flow resistance components, and the downstream straight pipe section is not less than 3-4D. Flow meters are usually calibrated in a horizontal position and are usually installed in horizontal pipelines. When they need to be installed in a vertical pipeline, the hanging weight method must be used to calibrate the vertical installation status of the flow meter, and the fluid direction should be from bottom to top.

2. For the convenience of maintenance and to prevent one-way force when the flowmeter is activated, a bypass pipeline is installed in parallel. A discharge pipe is installed downstream of the flowmeter to facilitate instrument cleaning and blowing. It is more necessary for measuring dirty fluids or media that are prone to solidification and crystallization. The target plate and measuring tube (body) should be installed coaxially. According to previous tests on a certain caliber, if the center of the target plate deviates 1mm from the center of the pipeline, it may cause a deviation of 1% to 2% in the flow coefficient. However, if the deviation is 1mm from the center of the pipeline, the impact is not significant;

3. When installing an explosion-proof target flowmeter, attention should be paid to checking whether there are explosion-proof markings and explosion-proof certificates, and whether the explosion-proof equipment is intact.

4. For ********** flow meters, due to their small diameter and relatively heavy weight, additional brackets should be installed to support the flow meters in order to prevent pipeline deformation or vibration during operation. For large-diameter flow meters, there is no need to install additional brackets.

7、 Precautions for use:

1. Before fluid flow, the downstream valve of the flowmeter should be closed and the upstream valve should be opened to allow fluid to enter the flowmeter section. Then slowly open the downstream valve of the flowmeter and close the bypass valve to allow the fluid to slowly increase. Avoid suddenly opening the valve to impact the target plate and damage the instrument.

2. After long-term operation of the flowmeter, in addition to cleaning the scale on the target plate and measuring tube, the hanging weight method should be used to check whether the characteristics of the force converter have changed. The hanging weight method is to apply a weight gravity in the same direction as the flow at the center of the target plate, adjust the instrument, and apply the force corresponding to the upper limit of the flow meter, which is calculated as F1 according to equation (16.6). Other flow points are added with relevant weights, and the output signal of the instrument is read to check the basic error and linearity of each point. The 'hanging weight method' is described in the product manual or other materials provided by the manufacturer, and can also be referred to

3. The force exerted by fluid on the target plate is still different from the force exerted by hanging weight, so hanging weight method cannot completely replace real flow calibration. To achieve high accuracy, necessary real flow calibration is still necessary.

4. When copying or modifying the target plate, attention should be paid to the processing accuracy of the target plate, otherwise it will affect the flow coefficient. Experimental data has shown that for a target flowmeter with a diameter of DN=25mm and a target diameter deviation of 0.03mm, the flow coefficient deviation is 1%. The processing accuracy and surface roughness of the target plate also have an impact on the flow coefficient.

5. When the flowmeter is running, if the output value is found to be shaking and the force conversion system is normal, it may be due to the fluid flowing through the target plate and generating vortex streets downstream, causing the target to vibrate under force. It is related to the flow velocity, physical parameters of the medium (density, viscosity), etc. Damping measures can be taken in the force conversion and electrical signal system to improve it.

8、 Selection precautions:

Target flow meters are suitable for measuring various occasions and media. To ensure satisfactory performance, it is recommended to pay attention to the following items when selecting:

1. Determine the required common traffic and determine the maximum traffic based on 1.5-2.5 times the common traffic.

2. Specify the standards and sealing methods for installing flanges, especially for special installation requirements, which should be clearly stated.

3. When placing an order, the user should specify the medium of the fluid being tested and provide the density of the medium.

4. If you need to measure special media, in addition to using the measuring tube materials provided by the company, you can directly recommend the required measuring tube materials.

Model Selection Table

model	caliber	Intelligent target flowmeter
HL-BSL	10~5000
		code	Instrument Type
		A*	Cone tube threaded type
		A	Pipeline flange type
		B	Clamp on type
		C	plug-in
		D	Online detachable type
		E	other
			code	Media Type
			Y	liquid
			Q	gas
			Z	steam
				code	medium temperature
				D	low temperature(-30℃～-200℃)
				C	normal temperature(-20℃～+80℃)
				Z	Moderate temperature(+80℃～+200℃)
				G	high temperature(+200℃～+500℃)
				nominal pressure	A：0.6MPa B：1.0MPa C：1.6MPaD：2.5MPa E：4.0MPa F：5.0MPaG：10.0MPa H：15.0MPa I：20.0MPaJ：25.0MPa K：42.0MPa L：2.0MPaM：6.3MPa N：11.0MPa O：16.0MPaP：26.0MPa
				Compensation form	P: Pressure compensation			T: Temperature compensation
				output form	N	No output (built-in lithium battery header display)
					S	pulse output
					R	Communication output
					I	4～20mACurrent output (two-wire system)
					K	Alarm switch output
					G	GPRSWireless remote transmission
				Explosion proof structure	X	Intrinsically safe type
					Y	Explosion proof type
				Shell Material	T	carbon steel
					N	stainless steel
					Q	Special materials
				Sensor material	1		Hastelloy alloy
					2		titanium
					3		304stainless steel
					4		Special materials

a、 The specifications of the flowmeter flange shall comply with the relevant technical parameters, technical conditions, and types specified in the GB/T series standards. It can also be processed according to customer requirements;

b、 In the selection of flow meters, users should specify the various requirements of the required flow meter in the format of the model description;

c、 If users need to use calibers, nominal pressures, and output forms other than those specified in this model, please provide explanations;

d、 When selecting a high-temperature flowmeter, in addition to filling in the model description format, the high operating temperature of the tested medium should be specifically indicated;

e、 For flow meters with temperature and pressure compensation, in addition to filling in the model description format, the operating temperature and pressure range that need to be compensated should be specifically stated;

f、 Users need special measurement tube materials, which should be explained.

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