VIP member
Threaded connection target flowmeter
Threaded connection target flowmeter
Product details
Detailed Introduction
1、 Product Overview:
The threaded connection target flowmeter is based on the traditional isolation diaphragm target flowmeter, and applies a new strain sensor to the target flowmeter. At the same time, it adopts * * * new digital technology and microelectronics technology to process the detected sensing signal into a 4-20mA signal output proportional to the flow rate, and displays the instantaneous flow rate and cumulative flow rate simultaneously through a double row large LCD, which significantly improves the structure and performance of the traditional target flowmeter.
2、 Structure and working principle:
1. Structure
The threaded connection 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
The threaded connection type target flowmeter generates a force on the target plate due to the pressure difference between its own kinetic energy and the target plate when the medium flows in the measuring tube, causing a slight displacement of the target plate. The magnitude of the force is proportional to the square of the medium flow velocity. The force acting on the target plate is transmitted through the target rod, causing a slight change in the elastic body of the sensor, thereby breaking the balance of the bridge composed of surface mount capacitors. Generate a voltage signal corresponding to the force exerted by the flow rate on the target plate: the flow rate is proportional to the square of the voltage generated by the bridge due to the influence of fluid flow characteristics. 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 - force acting on the blocking element (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 medium:
1. Gas class:
Gas, air, hydrogen, natural gas, nitrogen, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, chlorine gas, etc.
2. Liquid type:
Heavy oil, paraffin, asphalt, sulfuric acid, edible oil, residual oil, C * * *, diesel, mine water, detergent, soy sauce, gasoline, silicone oil, syrup, solvent, perfume, sea water, aviation kerosene, soap * * * water, glucose, vegetable acid, salt water, paste, ink, coolant, glycol, mineral oil, liquid sugar, hydrochloric acid, automotive paint, resin, butter, vegetable oil, liquid oxygen, shampoo, toothpaste, gel, fuel, milk, bleach, conditioner, soda, additives, detergent, alkaline, ammonia, marine oil, chemical reagent, kerosene, glycerin, dye, water, Boiling point organic solution, lard, additive, alcohol, oil, ethylene, polypropylene, methylbenzene, 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:
1. Caliber: DN6~DN50mm (available caliber for threaded target flowmeter);
2. Nominal pressure: 0.6-42MPa;
3. Operating temperature:+500 ℃~-200 ℃;
4. Accuracy: ± 0.2 to ± 2.5% FS;
5. Range ratio: 1:10;
6. Shell: Carbon steel, 304 stainless steel (or provided through negotiation according to user requirements);
7. Power supply method: Built in 3.6VDC lithium battery (changed every two years, without signal output); External supply 24VDC (with signal output);
8. Output signal: 4-20mA two-wire system; Pulse 0-1000Hz; Hart communication; RS232/RS485 (or provided upon user request through negotiation);
9. Protection level: IP65; IP67；
10. Explosion proof mark: intrinsic safety type ExiallCT4; Explosion proof ExdllCT4;
11. 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.
6、 Installation and usage instructions:
1. Normal temperature, low temperature, and high temperature flow meters are installed horizontally, vertically, or upside down depending on different working conditions (according to the factory calibration sheet);
2. When the working temperature of the medium is above+300 degrees, users should take insulation measures for the flowmeter housing to prevent thermal radiation damage to the meter head (the working temperature of the meter head is -30 to+70 degrees). Similarly, for media with a working temperature below -100 degrees, anti freezing measures should also be taken;
3. To ensure accurate measurement of the flowmeter, it is required to set up front and rear straight pipe sections;
4. To ensure that the flow meter does not affect the system operation during inspection and replacement, bypass valves (3) and shut-off valves (1, 2) should be installed as much as possible;
5. Vertical installation can be used due to process requirements, and the flow direction of the measured medium can be from bottom to top or from top to bottom, but it should be explained to the supplier when ordering;
6. The diameter of the flowmeter should be as similar as possible to the diameter of the connected pipeline to reduce flow interference and measurement errors;
7. The flowmeter housing must be reliably grounded. If there is no grounding condition, it should be explained to the factory.
7、 Fault handling:
Equipped with a fault self checking program, users can identify some of the causes through the display screen:
1. When the flow velocity of the measured medium in the pipeline is zero, the instantaneous flow rate value indicated by the flowmeter is not zero. The main reasons for this phenomenon are:
a、 The uneven levelness of the flow meter before and after installation results in the axial horizontal force generated by the tilting of the target plate and target rod, leading to the existence of instantaneous flow rate;
b、 The flowmeter operates for a long time, causing slight changes in the internal stress release of its sensor;
c、 During installation or operation, severe overload causes zero drift;
The above three methods can all refer to the steps and methods for clearing flow meters.
d、 Poor grounding of flowmeter housing;
Solution: The user needs to reconnect to the ground.
e、 The target, target rod, and measuring tool are stuck by debris;
Solution: Close the front and rear valves of the flowmeter, use tools to loosen the connecting bolts between the transition part of the flowmeter and the measuring tube, gently shake the transition part or remove it, clean up debris, and reset it as it is.
2. The abnormal increase in the reading of the flowmeter during operation is mainly caused by:
a、 There are filamentous and strip-shaped impurities hanging on the target film and target rod;
Handling method: Refer to the method for handling miscellaneous items.
b、 Under high blockage conditions, severe blockage occurs between the target plate and the target rod, resulting in an increase in the projected area of the force bearing element target plate along the axis of the measuring tube, that is, a decrease in the annular flow area between the target plate and the measuring tube. As a result, under the same flow rate, the force on the sensor increases, ultimately leading to an abnormal increase in the flow reading;
Solution: Remove the transition component and use tools to remove any debris from the target plate, target rod, and inner wall of the measuring tube.
3. There are many reasons for the large measurement error, and the main reasons are as follows:
a、 During installation, there is a significant misalignment in the concentricity between the flowmeter and the connecting pipeline, and the sealing gasket is not concentric, resulting in the formation of a throttling resistor and greatly affecting the flow state of the measured medium;
Solution: Adjust the installation status.
b、 The straight pipe sections before and after the flowmeter are too short, and elbows, valves, and other components that greatly interfere with the flow state of the measured medium are directly installed in front of the flowmeter;
Solution: Install according to the instructions or perform on-site flow calibration on the flowmeter.
c、 Leakage of bypass pipeline;
Solution: Check and replace the bypass pipeline.
d、 There are strip-shaped debris wrapped around the target, which increases the stress on the target;
Handling method: Refer to the previous method for handling miscellaneous items.
4. There are four main reasons why the flowmeter has no indication or signal:
a、 Poor contact or detachment of power supply;
Solution: For flow meters with built-in batteries, check if the battery is securely installed, if the contacts are in good condition, and if the battery is charged. For external power sources,
It should be checked whether the connections between the connecting wires are intact, whether the wires are conductive, and whether the external power supply is normal.
b、 The flow meter circuit is damaged;
Solution: Return to the factory for repair.
c、 The display screen is damaged;
Solution: Return to the factory for replacement.
d、 User signal receiving system malfunction;
Solution: Check and troubleshoot.
5. The reading of the flowmeter remains zero during operation, and the main reasons for this phenomenon are:
a、 The force bearing component (target) falls off, causing the sensor to be unable to sense;
Solution: Assemble target pieces of the same specifications.
b、 The flowmeter sensor has no voltage output signal;
Solution: First, check if the sensor is damaged. The specific method is to check if there are any changes in the sensor data.
c、 The flow rate of the measured medium is too small, lower than the minimum scale flow rate of the flowmeter;
Solution: Return to the factory and replace the load-bearing components.
8、 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. The flowmeter is usually calibrated in a horizontal position and is generally installed in a horizontal pipeline. When it needs to be installed in a vertical pipeline, the hanging weight method must be used to calibrate the vertical installation status of the flowmeter, 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, 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 supports should be installed to prevent deformation or vibration during operation. For large-diameter flow meters, there is no need to install additional brackets.
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.
Online inquiry
-
Contacts
-
Company
-
Telephone
-
Email
-
WeChat
-
Verification Code
-
Message Content
-