Target air flow meter

Target air flow meterOverview

Target flowmeter is a new type of capacitive 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.

1) Wide range of applicable pipe diameters: Φ 10~Φ 2000 to larger;
2) Wide applicable temperature range: -196 ° C~500 ° C;
3) Suitable for high/low pressure conditions: 0~42MPa;
4) Suitable for various media: gases, liquids (including high viscosity liquids, slurries), steam;
5) Suitable for low flow rate media, it can measure the lowest flow rate of 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 sensors is the key to achieving high precision and stability in this new product, which changes the limitations of the original strain type 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. Widely used for flow measurement in various fields such as metallurgy, petroleum, chemical, energy, food, and environmental protection.

Target air flow meterTechnical Specifications

Product Name: Target Flow Meter
02) Caliber: DN15 to DN3000mm (or even larger)
03) Nominal pressure: 0.01~42MPa
04) Operating temperature: -196 to+500 ℃
05) Accuracy: ± 0.2 to ± 1.5% FS
06) Range ratio: 1:15 (or even larger)
07) Shell: Carbon steel; Stainless steel (or provided according to user requirements) (lined with fluorine)
08) Power supply mode: Built in 3.6VDC lithium battery (changed every two years); External supply 24VDC (optional)
09) Output signal: 4-20mA two-wire system; Pulse frequency range of 0-1000Hz; RS232/RS485 (or to be provided upon user request)
10) Protection level: IP65 IP67
11) Explosion proof mark: intrinsic safety type ExiallCT4; Explosion proof ExdllCT4
12) Execution standard: Enterprise standard Q/BET05-06
13) Header display: Accumulated traffic; Instantaneous flow rate; Operating temperature; Operating pressure (only available with temperature pressure compensation);
14) Rod shaped full-scale percentage; Fault self check
15) Connection methods: double flange type, plug-in type, clamp type, quick coupling type, online detachable type.

feature

01) The entire instrument structure is sturdy without moving parts, with an insertable structure that is easy to disassemble;
02) Multiple anti-corrosion and high/low temperature resistant materials can be selected (such as Hastelloy, titanium, etc.);
03) The whole machine can be made into a fully sealed (welded form), without any leakage points, and can withstand high pressure of 42MPa;
04) The instrument is equipped with a self checking program, and the fault symptoms are clear at a glance;
05) 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;
06) The dry calibration method can be used on-site, that is, the weight hanging method can be used. Single key operation can complete calibration;
07) There are multiple installation methods to choose from, such as online plug-in, which has low installation costs;
08) Equipped with integrated temperature and pressure compensation, directly outputting quality or standard specifications;
09) 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.