Temperature compensation target flowmeter

Products overview:
ZW - BSL seriesTemperature compensation target flowmeterAvailable in 6.0 MPa, 450 ℃ under the condition of measuring superheated steam;In the saturated steam occasions, some without instrument suitable for steam flow rate is too low, can only be solved by reducing, measurable advantage, low velocity does not need to change the meter diameter can be used;In boiler steam, the steam consumption difference is very big, winter and summer only need to change the target plate can meet the requirements of scale transformation, not need to order the instrument;Steam flow rate, temperature and pressure are some occasions at time of change, temperature compensationone-pieceTarget flowmeter sensors can sampling the temperature of steam pressure parameter, according to the international council of water and water vapor properties iapws-if97 dynamic compensation flow formula, make steam measurement more accurate.

Second,Structure and working principle:

1, structure,

ZW series - BSL temperature pressure compensation target flowmeter is mainly composed of measuring tube (shell), new sensors (including choke element), integrating display and output parts.According to the different medium and condition, must choose appropriate sensors, therefore, provide accurate object and parameter measurement, and manufacturers to choose appropriate sensor is the key of the products can be accurate measurement.

2, working principle

When medium in the measurement of pipe flow, because of its kinetic energy and target plate pressure difference, and produce on the target plate force, make the target board of trace amounts of displacement, the force is proportional to the square of the velocity with the media, the size of the target plate force of the target bar transfer, make the sensor elastomer produces trace changes, thereby breaking patches of capacitance bridge balance.Generation and corresponding voltage signal flow force on the target board: by the fluid flow characteristics, the influence of flow rate and is proportional to the square of the voltage produced by the bridge.Its mathematical expression is as follows:

CdA rho/V2 / F = 2

Type: F choke a force (kg) of

Drag coefficient Cd object

A choke pieces on the measuring tube axial projection area (was)

Rho conditions of medium density (kg/m3)

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

Choke (target) accept force F, the rigid connection of transfer (rod) to the sensor, the sensor produces voltage signal output: V = KF

Type: V - sensor output voltage (mV), K - proportionality constant, F - choke piece (target) by force (kg),

The voltage signal after preamplifier, AD conversion and computer treatment, obtains the corresponding instantaneous flow and cumulative total.

Applications:

ZW - BSL seriesTemperature pressure compensation target flowmeter is suitable for high temperature oil refining industry, such as diesel oil, bitumen, tar, C4 fractionation under high temperature and medium environment, can be very good to solve this kind of flow measurement, measurable zui high medium temperature can reach 450 ℃;In superheated steam, due to the high temperature and high pressure medium, a lot of meters are not suitable for such conditions.
Four, the main features:
1, suitable for all kinds of pipe diameter: 15-2000 - mm to bigger.
2, suitable for high and low temperature medium: - 196 ℃ to + 450 ℃.Can accurately measure all kinds of room temperature, high temperature, low temperature condition of the liquid, gas, steam, viscous medium and all kinds of fluid flow.
3, high sensitivity, can measure small flow rate, it can measure the low velocity of 0.08 m/s.
4, suitable for high pressure conditions: 0-42 mpa.
5, have no moving parts, high accuracy.
6, good repeatability, is 0.1 0.08% commonly, fast measurement.
Total 7, accurate measurement, high accuracy, measurement can reach 0.2%.
8, good vibration resistance to electromagnetic interference, can dry calibration, and farmar hanging weight method.
9, body material: carbon steel, 304316316 L.
10, mode of power supply: 3.6 V lithium batteries;24 VDC power supply;Double power supply: 3.6 V lithium battery + 24 VDC power supply.
Five, the technical parameters:
1, the measured medium: liquid.Gas;steam
2, nominal diameter pipeline: 15 ~ 300 mm clamp mounting type: 15-600 - mm plug-in: 100 ~ 2000 mm
3, nominal pressure: 0.6 ~ 42 mpa
4, medium temperature: - 20 ℃ ~ 70 ℃ (room temperature).- 196 ℃ ~ + 450 ℃ (high and low temperature type)
5, accuracy: + / - 0.2%, plus or minus 0.5%, plus or minus 1.0%, plus or minus 1.5%, plus or minus 2.5%
6, scope: 1:3, 1:5, 1:10, 1:10 (gas), 1:10 (steam)
7, compensation type: temperature compensation;Pressure compensation
8, repeatability: 0.1% ~ 0.08%
9, the power supply: machine with a built-in 3.6 V lithium batteries;The 24 VDC power supply source;220 vac (only for fission digital tube display)
10, output form: the display reading values;4 ~ 20 ma (two wire system);Pulse;0 ~ 10 v.RS232 / RS485 (optional)
11, the measuring tube material: carbon steel;304;316 l;Can also according to user requirements to provide
12, explosion-proof marks: the Ann model (ExiallCT4) flameproof (ExiallBT4)
13, protection grade: IP65;IP67
Note: meter flange specifications implement GB/T9115.1-9115.4-2000 series standards, pipeline according to user needs production DN6, DN8, DN10 small flow meter, etc.
Six, installation instructions:
1, normal temperature, low temperature, high temperature type flowmeter depending on the different working conditions using horizontal, vertical or inverted type installation (the factory check list shall prevail);
2, medium temperature when + 300 degrees above, the user response to flowmeter shell heat insulation measures are taken to prevent thermal radiation damage to the header (header working temperature for 30 to + 70 degrees c), the same work under medium temperature - 100 degrees, also should adopt anti-freezing measures;
3, to guarantee the accuracy of the flowmeter measurement, requirement set straight pipe before and after;
4, in order to ensure the flowmeter in inspection and replacement does not affect the system work, should try to set the by-pass valve (3) and the cut-off valve (1, 2);
5, due to the need of technology can be used vertical installation, the flow direction of medium under test can be bottom-up, also can from top to bottom, but when ordering should explain to the supplier;
6, flow meter diameter and connected to the pipe diameter size is the same as far as possible, to reduce the flow disturbance, caused by measurement error;
7, flowmeter shell must be reliable grounding, without ground conditions should explain to the manufacturer.
Seven, fault handling:
（Flowmeter with breakdown self check program, the user through the display screen can be found in part!）
1, when the pipe velocity is zero, the measured medium flow meter of instantaneous flow rate of values are not zero, the main cause of this phenomenon are as follows:
A, levelness, before and after installation flowmeter and target and target pole caused by tilting and produce axial horizontal component of the instantaneous flow exists;
B, flow meter run for a long time, the sensor inner stress release production micro changes;
C, in the process of installation or operation, serious overload caused by zero drift;
You may refer to the above three ways are about flow meter reset steps and methods of treatment.
D, bad earth flowmeter shell;
Processing method: users to ground.
E, target, target and measurement is sundry stuck between;
Processing method: before and after the valve closed flowmeter, excessive parts with tools to loosen flowmeter and bolt connection of the measuring tube, and gently shaking the transition parts or remove and clean up the clutter can be reset as is after.
2, the working process of the flowmeter in appear abnormal value increases, the main cause of this phenomenon are as follows:
A, target and target stem with filamentous and banded sundry;
Methods: reference to deal with sundry method.
B, under the condition of high knot engine-grease, target and target pole have serious engine-grease, make the stress components on the target plate along the measuring pipe axis projection area increase, namely the target piece between the measuring tube and annular flow area is reduced, and under the same flow rate, the sensor stress increases, zui has led to an increased flow of abnormal value;
Processing method: remove the transition parts, use tool to target and target rod and the measuring tube wall engine-grease things clear.
3, measurement error is large, some of the reasons for this phenomenon, its zui the main reason for the following:
A, when installation relative concentricity appear larger displacement meter and connection pipe, sealing gasket is not concentric, thus forming the throttle resistance, greatly influence the measured medium.
Mass flow;
Methods: adjust the install state.
B, the straight pipe before and after the flowmeter is too short, and directly installed the bend before the flow meter, valve, such as great interference flow components measured medium;
Methods: according to the specifications for installation or real flow field to calibrate the flowmeter.
C, by-pass pipe leakage;
Methods: inspection and replace the by-pass pipe.
D, target sheet wrapped around have banded sundry, increases the target bearing;
Processing method clutter processing method: with reference to the front.
4, flow meter with no signal or no, value for its reason mainly has the following four:
A, power poor contact or fall off;
Methods: for the onboard battery meter, check whether the battery pack, contacts are in good condition, and whether there is a battery.For the power converter,
Check the connection between the connecting wires are in good condition, whether the wire conduction, external power supply source is normal.
B, flow meter circuit damage;
Methods: to return factory repair.
C, screen damage;
Methods: change back to factory.
D, customer reception system failure;
Processing method: check, troubleshooting.
5, flowmeter has zero value, during the operation of the main reasons for this phenomenon are as follows:
A, stress components (target) fall off, lead to weak inductive sensor;
Methods: assembly specifications of the same target.
B, no voltage meter sensor output signal;
Processing method: first of all determine whether the sensor is damaged, the specific method is to see the sensor data have any change.
C, the medium flow rate is too small to be tested, below zui small scale flow meter;
Methods: returned to the factory to replace the mechanical components.

Ten, parameter table: