Simple plug-in vortex flowmeter

• 

Simple plug-in vortex flowmeter is mainly used in various industries industrial gas, liquid and stea…

Products overview:
ZW - LUCB seriesSimple and easyPlug-in vortex flowmeterAdvantage is ant-vibration performance is very good, no zero drift, high reliability.Through a long period of time to a large number of vortex street flowmeter waveform analysis and spectrum analysis, design the ideal probe shape, wall thickness, height, probe rod diameter and piezoelectric crystal, associated with the use of advanced numerical control lathe processing, to ensure that the processing of coaxial degree and bright and clean degree, technical parameters, such as cooperate with special craft processing, thereby to zui greater level of vortex flowmeter are overcome the influence of the intrinsic self oscillation frequency of the signal of this disease.

A line is mainly used in the large size, reduce the piping installation, etc., to save costs.Flow measurement is very important link in industrial processes, selection is a very serious matter, must first understand the nature of the process fluid, fully considering the accuracy and measurement environment, repeatability, measurement range, factors such as pressure loss and the response time, to give a correct judgment for selection.With the progress of sensor technology and computer technology, the flow measurement to the high reliability, wide adaptability and good signal transmission, etc.

Second, the working principle:
ZW - LUCB seriesSimple and easyPlug-in vortex street of vortex street flowmeter measuring head (i.e., small vortex flow sensor) is the use of the karman vortex street "principle to develop and become. In vortex measuring head table, vertical insert a triangular prism spiral body, namely when the tables are in the medium flows through the body, is in the opposite direction in both sides of the triangular prism alternate with the rules of the karman vortex street, the signal frequency of vortex is made of the piezoelectric element detection head, detected on one side of the separation of the vortex frequency proportional to the flow of the medium speed, see formula f = V * St/d / 1-1.27 d
Type: f - separation vortex frequency, triangular prism side (Hz);
St, turow ha is a constant;
Average flow velocity, V, the pipe (m/s);
D - the width of triangular prism characteristics, (m);
D - measuring head diameter, (m).
Through a lot of experimental test, determine the vortex street instrument of measuring head coefficient k. formula is as follows:
K0 = f/V
Type: the head meter coefficient K0 - measurement, (1 / m);
The speed of measure head V points - points, (m/s).
Based on the relationship of velocity V and the pipe flow, plug-in vortex flow sensor can be determined under the different pipe meter factor KT (1 / m3), average flow velocity and volume to determine the pipe flow.
Applications:
ZW - LUCB seriesSimple and easyPlug-in vortex flowmeter is widely used in petroleum, chemical, metallurgical, thermal, textile, paper and other industries of superheated steam and saturated steam, compressed air and general gases (oxygen, nitrogen, hydrogen, natural gas, coal gas, etc.), water and liquid (such as: water, gasoline, alcohol, benzene, etc.) of the measurement and control.
Four, the main features:
1, using micro power consumption of new and high technology, high technology content, stable performance, high precision, long life, technology and components are imported.
2, simple structure and strong, have no moving parts, high reliability, long running is very reliable
3, good seismic performance, zero drift, elimination of the influence of external vibration effectively.
4, the output is the pulse signal is proportional to the flow, no zero drift,
5, wide measuring range, range than up to now.
6, the liquid crystal display, at the same time, the instantaneous flow display, accumulative total, display, frequency, percentage, don't have to take turns to switch.
7, in situ Settings, convenient parameter adjustment, without hand-held com.
8, small pressure loss, wide dynamic range, low operating cost, comprehensive energy saving.
9, density, temperature and pressure compensation calculation, compensation formula online inspection.
10, 0 to 5 khzpinlv output, 4-20 ma output or HATR communications, Modbus protocol communication, can be connected to the industrial automation system.
11, according to the requirements can separate sensors and instrument, the fission control and remote control.
Five, the technical parameters:
1, the nominal diameter (mm) : 12 ~ 2200 plug-in);
2, nominal pressure (MPa) : 1.6 4.0;
3, medium temperature (℃) : piezoelectric: - 40-450 ℃ (protocol order);
4, ontology materials: 1 cr18ni9ti, (other material supply agreement);
5, accuracy: + / - 1% R, plus or minus 1.5% R, plus or minus 1 fs.Insert: plus or minus 2.5% R, plus or minus 2.5% FS.
6, the power supply voltage: sensors: DC + 12 v, + 24 v DC;Transmitter: + 24 v DC;Battery type: 3.6 V batteries;
7, the output signal, square wave pulse type (not including batteries) : a high level 5 v, or low level 1 v or less;Current: 4 ~ 20 ma;
8, explosion-proof marks: the Ann model: Exd Ⅱ ia CT2 - CT5 flameproof: Exd Ⅱ CT2 - CT5;
9, protection level: ordinary IP65;
10, environmental conditions: temperature - 20 ℃ ~ 55 ℃, relative humidity 5% ~ 90%, atmospheric pressure of 86 ~ 106 kpa;
11, suitable medium: gas, liquid and steam;
12, transmission distance sensor: zui up to 4 km, two wire transducer (4 ~ 20 ma) : load resistance Ω 750 or less.
Installation method:
Insert vortex measurement head pipe specific location, by measuring the position of the local traffic, according to the pipe sectional velocity distribution relationship, calculate the average flow velocity in pipe.It is composed of converter, insert rod component, ball valves (with) based on the requirements, short tube (ф 100) installation, vortex measurement of the first class.
Seven, installation steps:
1, the need to install the flow meter of pipeline is directly above (horizontal line with this requirement), cut a slightly smaller than ф 100 holes, remove the burr;
2, will be the end of form a complete set with the short tube flange at the top of the hole, keep the short tube and vertical tube, welding firmly;
3, put gasket, insert the flowmeter, flange connection, if there are ball valve, should first put the ball on the short tube connection is good, then open the ball valve, inserted into the meter;
4.Ensure more than 15 D before and after the flow of 5 D straight pipe to pipe diameter (D). 

Need to pay attention to during the period of eight, debugging, using question:
1, flowmeter, on-site installation, maintenance, must abide by the "explosion-proof gas do not open" warnings, and in the open before turn off the power supply.
2, vortex flow meter used in outdoor, suggestion and side shields.
3, shall not be arbitrarily fixed part loosen the flowmeter.The protection of the pressure sensor.Users in the use of traffic time, should pay attention to the flow pressure overload value of pressure sensor is rated working pressure of 1.5 times (that is, the media zui high pressure of 1.5 times).Selection should be within the prescribed flow range, prevent overspeed operation, in order to obtain the ideal accuracy and ensure the normal service life.(due to pressure test, purging pipes or exhaust overdrive, and turbine operation in the reverse flow meter can cause damage)
4 when put into operation, the vortex street flowmeter, should slowly open valve, prevent damage of instantaneous flow and the turbine.Add lubricant should be according to the sign, the number of refueling depends on temperament clean degree, usually 2 ~ 3 times a year.
5, vortex street flowmeter runtime or alternate internal related parameters are not allowed to open the rear cover, otherwise will affect the normal operation of the meter.

Nine,Note:

1, special flange and straight pipe welding can't with the sensor.

2, when installation should make the flow of sensor mark the direction of flow and the pipe.

3, before the installation of sensor and the flange must be put away in sealing ring grooves.The location of the pressure and temperature measurement point, pressure downstream of the sensor in 3 ~ 5 dn, temperature measuring points in the downstream of 5 ~ 8 dn.

4, when measuring high temperature medium, do not use heat insulation material to wrap around the sensor link rod.

5, shielded cable to connect the sensor, should as far as possible away from the interference of strong electromagnetic field.Absolutely not allowed with high voltage cable laying, shielded cable to shorten as far as possible, and shall not be volume, in order to reduce stray inductance, zui big length should be not more than 200 meters.

6, before installation of sensors, pipeline cleaning must be conducted.Flow after rinse tube impurities, avoid clogging sensor.Measuring liquid pipe must be full of measured liquid, prevent the interference of bubbles.

7, measuring gas pipelines to prevent the interference of reservoir fluid.Replace the probe body under the high temperature and high pressure, it must be safe operation, high temperature protection.After cooling step-down replaceable probe at the bottom of the safety conditions.

Ten, parameter table：

Eleven, flow range:

Twelve, selection of coding:

13, order selection selection guidelines:

Name and model number of 1, 1), (2) the diameter, flow range, (3) whether or not to bring the attached so that we can correct selection for you, (4) using pressure, (5) the use of medium temperature.

2, if has been selected by design units in the way of vortex street flowmeter types, please press type vortex flowmeter directly order from our sales department.

3, when using occasions is very important, or the environment is complex, please try to provide the design drawings and detailed parameters, by wei experts in our audit checks for you.

After-sales service commitment:

1, from the date of signing of the contract, I in the way provided for products of the company offers free maintenance and maintenance service, commitment to lifelong maintenance service;

2, jiangsu wei measurement and control instrument co., LTD. Sales manager will be in regular contact with customers, understand the usage of products, and solve the problems of the customers to use in the process of produce, free of charge to provide technical support;

3 the man-made damage is found, the warranty period, our company is responsible for the maintenance, and the resulting maintenance fee;

4, product quality problems or are not satisfied with product, the user can choose unconditional return, wei tt&c don't charge any fees, appear quality problem, bear the freight back and forth.