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Shangyi Ninth Factory

NegotiableUpdate on 12/13

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The target flowmeter of Shangyi Ninth Factory was first applied in industrial flow measurement in the 1960s, mainly used to solve the flow measurement of high viscosity and low Reynolds number fluids. It has gone through two major development stages: pneumatic and electric meters. The intelligent target flowmeter is a new type of flow measurement instrument developed based on the measurement principle of the original strain gauge (capacitive) target flowmeter, using the latest force induction sensor as the measurement and sensitive transmission element, and utilizing modern digital intelligent processing technology.

Product Details

上仪九厂

Overview of Intelligent Target Flow Meter

Intelligent target flowmeter is a new type of force induction flowmeter developed on the basis of traditional target flowmeter with the development of new sensors and microelectronics technology. It has the characteristics of no movable parts such as orifice plate and vortex street flowmeter, as well as high sensitivity, accuracy comparable to volumetric flowmeter, and wide range.

● Wide range of applicable pipe diameters: Φ 10~Φ 2000 to larger;

● Wide applicable temperature range: -196 ° C~500 ° C;

Suitable for high/low pressure conditions: 0~42MPa;

Suitable for various media: gases, liquids (including high viscosity liquids, slurries), steam;

Suitable for low flow media, it can measure low flow ratesThe flow velocity is 0.08m/s.

principle

When the medium flows in the measuring tube, due to its own kinetic energy and pressure difference with the target plate, a force is generated on the target plate, causing a slight displacement of the target plate. The magnitude of the force is proportional to the square of the medium flow velocity, and its mathematical formula is:

F = Cd? A?ρ? V2/2

F: The force acting on the target plate

Cd: Fluid resistance coefficient

A: Target plate on the axial projection area of the measuring tube

ρ: Density of medium under working conditions

V: Characteristic flow velocity of the medium in the measuring tube

The force acting on the target plate is transmitted through the target rod, causing a slight change in the elastic body of the sensor. After circuit conversion, the corresponding electrical signal is output.

The use of capacitive force sensors is the key to achieving high precision and stability in this new product. It changes the limitations of the original strain gauge target flowmeter, such as large temperature drift, poor overload (impact) resistance, and static sealing points. It not only leverages the technical advantages of the target flowmeter, but also has measurement accuracy comparable to volumetric flowmeters. In addition to its anti-interference and anti impurity performance, it can replace the flow measurement problems that can be measured by conventional flow meters, especially in difficult flow measurement conditions such as small flow, high viscosity, easy coagulation and blockage, high and low temperature, strong corrosion, and strong vibration, and has good adaptability. At present, it has been widely used for flow measurement in various fields such as metallurgy, petroleum, chemical industry, energy, food, and environmental protection.

Technical parameters of intelligent target flowmeter

Accuracy: ± 0.2 to ± 1.5% FS

Range ratio: 1:10

Shell: Carbon steel; Stainless steel (or provided according to user requirements) (lined with fluorine)

Power supply method: Built in 3.6VDC lithium battery (changed every two years); External supply 24VDC (optional)

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

Protection level: IP65 IP67

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

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

Connection methods: double flange type, plug-in type, clamp type, quick coupling type.

Characteristics of Intelligent Target Flow Meter

1. The entire instrument structure is sturdy without moving parts, with an insertable structure that is easy to disassemble;

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 into a fully sealed dead corner (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 ranging from 0.05% to 0.08%, and 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 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.

Typical Applications

Gases: coal gas, air, hydrogen, natural gas, nitrogen, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, chlorine gas, etc

Liquids: heavy oil, paraffin, asphalt, sulfuric acid, edible oil, residual oil, acetone, diesel oil, mine water, detergent, soy sauce, gasoline, silicone oil, syrup, solvent, perfume, sea water, aviation kerosene, soap ketone water, glucose, vegetable acid, brine, paste, ink, cooling agent, ethylene glycol, mineral oil, liquid sugar, hydrochloric acid, automotive paint, resin, butter, vegetable oil, liquid oxygen, shampoo, toothpaste, gel, fuel, milk, bleaching agent, conditioner, soda, additives, cleaning agent, alkaline, ammonia, marine oil, chemical reagent, kerosene, glycerin, dye, water, nitric acid, High boiling organic solution, lard, additive, alcohol, oil, ethylene, polypropylene, methylbenzene, etc.

Common faults and their solutions

(The flowmeter comes with a fault self checking program, and users can check some of the reasons 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 a non normal 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 measured medium

Qualitative flow state;

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 supply, it is necessary to check whether the connection between the connecting wires is 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 low, below the minimum scale flow rate of the flowmeter;

Solution: Return to the factory and replace the load-bearing components.