General electronic flowmeter

Products overview:

ZW series - LEWGeneral electronic flowmeter(hereinafter referred to as the flowmeter) is a new type of electromechanical integrated intelligent speed meter.For the domestic original, it absorbs the traditional speed characteristics of the single flow meter in the flowmeter, innovation of the structure, improve the accuracy.And through the microcomputer system internal error correction, make accurate measurement reached a magnitude of 0.5, and can be online calibration on site.The flowmeter is characterized by simple structure, strong and durable, installation, use convenient maintenance, small flow can be measured, BuKa plugging.And the medium requirements is not high, oil, gas, sand, clay and mixture can still be completely normal work.The digital display accumulation and instantaneous flow, intuitive, clear and accurate and instantaneous flow and flow conversion device at a time.And can be reset.With the secondary display far eastone standard communication interface.Far eastone way has two kinds of pulse and current output.There are self-provided power supply.Can still use without external power supply.Anti-interference ability is strong, the flowmeter under the condition of high electric field, magnetic field work.Can be applied to all kinds of places.

Second, the working principle:

ZW series - LEW general electronic flowmeter is mainly composed of shell, movement, of four parts, sensors, flow totalizer.especially movement easily taken from the watch case, maintenance of flowmeter swaps and periodic verification work has brought great convenience, the adoption of advanced electronic technology and unique design makes the product has high stability and anti-interference ability.This product apply to d Ⅱ AT4 occasions, internal batteries.(can work continuously for two years).

When through the measured medium flow timing, impact measurement chamber impeller rotation, within the scope of certain traffic, the impeller speed is proportional to the flow, and when the impeller rotates, the impeller blade made of magnetic stainless steel, in order to sensors on the coil in the shell, the periodic change of magnetoelectric sensor coil circuit magnetic resistance made by coil magnetic flux changes and produce at the same time the flow is proportional to the pulse signal, the signal after data processing, respectively, showing the cumulative flow value and the instantaneous flow values.

Applications:

ZW series - LEW general electronic meter has high measurement accuracy, small volume, wide flow range and strong anti-jamming capability, to prevent fouling prevention, prevent impurities, high temperature resistant, corrosion resistant, low power consumption, the instructions and far transmission characteristics, widely used in petroleum, chemical industry, metallurgy, light industry and other departments, especially suitable for oilfield water blending, mixing thin oil metering and of low viscosity liquid sewage and the measurement of product oil, edible oil.

Four, the main features:

1, high accuracy and range than wide;

2, high temperature resistance, corrosion resistance;

3, to prevent fouling prevention, prevent impurities;

4, fast discharge type, interchangeable;

5, field instructions, far transmission;

6, measuring medium: water, sewage, oil, cooking oil.

Five, the environmental conditions:

1, the ambient temperature: - 40 ℃ ~ + 80 ℃;

2, the atmospheric pressure: 86 kpa to 106 kpa.

3, altitude, 2000 m or less;

4, the external magnetic field strength: 400 a/m or less.

Six, electric performance parameters:

1, the working power supply:

A.24 VDC power supply: + + / - 15%, ripple < 5%, suitable for 4 ~ 20 ma output, pulse output, alarm output, RS - 485, etc;

B.Power supply: 1 set of 3.6 V lithium battery (ER26500), when the voltage is lower than 3.0 V, the under-voltage directives.

2, the machine power consumption:

A.External power: < 2 w.

B.1 mw power within: the average power consumption, can be used for more than two years in succession.

3, pulse output mode:

A.Working condition of the pulse signal, directly to the flow sensor detect the working condition of the pulse signal through optical coupling isolation amplifier output, high level 20 v, or low level 1 v or less;

B.Calibration pulse signal, and form a complete set of valve controller IC card, high level of 2.8 V or higher, low level of 0.2 V or less, the unit pulse on behalf of the volume flow rate can be set range: 0.001 m3 ~ 100 m3.Single choice must pay attention to: when the value calibration pulse signal frequency should be 900 hz or less.

C.Scaling the pulse signal, the optical coupling isolation amplifier output, high level 20 v, or low level 1 v or less.

4, RS485 communication (photoelectric isolation), which can realize the following functions:

A.The RS - 485 interface, can connect directly to a PC or secondary table, remote transmission showed that the temperature of the medium, pressure and the temperature and pressure compensation after standard volume flow rate and total volume;

B.By RS485 interface and data collector, shall constitute a network communication system, a data collector with 15 meter;

C.By RS485 interface and data collector, shall constitute a broadbａnd communication systems, from the INTERNET to transmit data, a data collector can bring 8 meter.

5, 4 ~ 20 ma current signal (photoelectric isolation)

Is proportional to the standard volume flow, 4 mA for m3 / h, 0 to 20 mA corresponding zui big standard volume flow (this value can be set in the primary menu) and formats: two wire system or three wire system, flow meter can be according to the current module automatically identify, and correct the output.

6, control signal output:

A.The lower limit alarm signal (LP) : photoelectric isolation, high and low level alarm, alarm level can be set, working voltage 24 v, + 12 v ~ + 50 ma load current;

B.Upper limit alarm (UP) : photoelectric isolation, high and low level alarm, alarm level can be set, working voltage 24 v, + 12 v ~ + 50 ma load current;

C.Close the valve alarm output (BC side, the IC card control device) : logic gate output, normal output low level, the range of 0.2 V or less;Alarm output high level, 2.8 V or higher, load resistance 100 k or higher Ω;

D.Battery under-voltage alarm output (BL, IC card control device) : logic gate output, normal output low level, the range of 0.2 V or less;Alarm output high level, 2.8 V or higher, load resistance 100 k or higher Ω;

Seven, real-time data storage function:

1 meter in order to adapt to the need of data management, strengthen the function of real-time data storage, choose by setting one of the following three:

A.Start-stop record: Z nearly 1200 times of start-stop time, total amount, net flows.The factory default.Corresponding communication protocol provided by the company in addition);

B.Record: Z nearly 920 date, zero point of temperature, pressure, standard volume flow and total record.

C.Fixed time interval record: 1200 set a date for the interval time, temperature, pressure, standard volume flow rate and the total records.

2 through a computer can read the stored data, report form data, graph for analysis.

3. The network communication function of management software

Flowmeter and form a complete set of data acquisition unit, by wire or broadbａnd network to communicate, to network history data and parameters of each flow meter reading and setting, and communication management software which can realize perfect management function.

4, explosion-proof marks: ExdIIBT4;ExiaIICT4

5, protection grade: IP65

6, the pressure loss

Flowmeter actual pressure loss calculation formula is as follows:

Type:

Δ P1 - meter actual pressure loss (KPa);

Rho - measured medium density (kg/m3)

Δ P - medium to dry air flow meter of pressure loss (KPa),

7, connection: outlet interface for M20 thread within x 1.5.

Eight, note:

In the process of selection should grasp two principles;Namely: to ensure the production safety, to ensure the accuracy.Therefore must to carry out the selection of the three parameters, namely the immediate and long-term zui, zui small and common flow (nominal size is mainly used for the selected instrument), the design of the measured medium pressure (mainly used for the selected nominal pressure level meter), the actual working pressure (pressure level) is mainly used for the selected instrument pressure sensors.

A. when measured flow known as the working condition of traffic volume, can be directly according to the flow range to select in the table adapter of nominal diameter;

B. when measured flow for the known conditions under the condition of traffic volume, should first will be the volume flow QN conversion for the working condition of volume flow Qv, again according to the technical parameters of the flow range in the table to select the corresponding nominal diameter;

C. when two diameter flowmeter can cover zui low and zui high volume flow, with the permission of the loss of pressure, should try to choose small diameter;

D. don't make the actual z small flow Qmin below the selected nominal flow meter flow limit;

E. flow range, nominal pressure have special requirements to order agreement.

Selection of computation formula is as follows:

Meaning type: T, P, Pa, op Q for volume flow, Qn for standard volume flow, Z/zinc values listed in table 2. Due to the calculation step length is larger, the data in the table is for reference only, the data in the table according to the gas Gr = true relative density 0.600, nitrogen and carbon dioxide mole fraction are calculated as 0.00.When the medium pressure below 0.1 MPa, all can according to the Z/zinc = 1 estimate.

Nine, technical parameter table:

Ten, the size of the installation:

Eleven, selection of coding:

Twelve, designing order selection guidelines:

1, products: if you have designated models standard, please hit wei sales hotline advisory prices, details!

2, technical support, if not specified product specifications, please put the working condition of requirements, design drawings, technical specifications, fax or to us.

3, product orders for parameters: size (DN), nominal pressure (Mpa), temperature (℃), the connection way (flange, plug, etc.).

4, offer confirmation: the company provide price list and technical standard specifications to customers to confirm, in the technical aspects to confirm before you draw up a contract.

5, quality requirements, quality standards, the supplier is responsible for the quality conditions: according to the relevant state quality standards.

After-sales service commitment:

1, ZW - LEW series flow meter I companies sell products appear quality problem, within twelve months for free maintenance.

2, the warranty period, any quality problems such as the products of our company, my company is responsible for free repair or replacement.

3, the warranty period, such as user improper use, damaged products, my company is responsible for the maintenance, charge damage parts cost.

4, after the warranty period appear quality problem, my company is responsible for the maintenance, charge damage parts cost.

5, such as user need to my company site services, to users in the province I company service personnel to reach the site within 12 hours, fujian association of foreign languages and user reach the site within 48 hours.