Pitot tube flowmeter

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ZW series of PTGPitot tube flowmeter，Also known as "Pitot tube", "wind pipe," En…

Products overview:
ZW series of PTGPitot tube flowmeter，Also known as "Pitot tube", "wind pipe," English is a Pitot tube.Pitot tube measurement of the static pressure and total pressure airflow to determine air velocity, flow rate of a pipe device.By the French h. pitot invented the name.
In scientific research, production, teaching, environmental protection, and tunnel, mine ventilation, energy management, commonly used pitot tube measurement of ventilation pipes, industrial piping, furnaces flue gas velocity, after conversion to determine the flow rate, measurement of flow velocity in the pipe.With pitot speed and determine traffic, according to have reliable theory, easy to use, accurate, is a classic wide measuring method.In addition, it also can be used to measure the pressure of the fluid.
Second, the working principle:
ZW series of PTG pitot tube flowmeterFlow direction is greeted in the pitot head is a known as the total pressure hole, in the form "stagnation", in a certain distance from the head to open several static pressure hole perpendicular to the direction of flow.Static pressure that the bore is the hydrostatic pressure in the chamber after the equalizer output, due to the difference between the total pressure and static pressure of the fluid and the flow velocity determine the numerical relationship with body, therefore pitot tube measured fluid velocity can be used to calculate the size of the measured flow.
Applications:
ZW series of PTG pitot tube flowmeterIs a right Angle bend double hollow compound bone, with multiple hole pressure, total pressure and static pressure fluid can be measured simultaneously.With differential pressure transmitter, flow display systems.It's in petroleum chemical industry, metallurgy, power plant, electric power, textile and other industries widely used in the production of the gas, liquid, steam, water, air and other fluid flow measurement.
Four, the main features:
1, the unique internal structure of quadratic mean, provides the high precision reading (+ 1%) and high repeatability (plus or minus 0.1%).
2, the outer shock tube USES a single piece of material processing and welding, and welded together by twin hull structure similar products than those with natural zui, high strength and easy to use high temperature resistant, corrosion resistant material.
3, the hexagonal honeycomb structure stable, is produced by the unique shape of the distribution of a beam to ensure the stability of the low voltage signal, the differential pressure is higher than similar products, improve the range ratio.
4, suitable for square or rectangular pipe.
5, when dirt medium for similar products in the measurement of inevitable congestion, there are online can be pulled up or provide manual and automatic purging methods and devices, not achieve production maintenance.
6, velocity-equalizing tube + 3 + + transmitter temperature pressure compensation valve group, component integration structure, easy to use.
7, no flow coefficient, the long-term stability.
8, * provide intuitive resonance check, ensure the long-term stable operation.
9, small pressure loss of low energy consumption, energy saving effect is remarkable.
10, installation convenient save artificial, low price quick delivery (1 week). 
Five, the technical parameters:
1, specifications: (- DN5000 (mm);Insert: DN500 - DN5000 (mm);
2, the measurement accuracy: + / - 6.0%;Repeatability: + / - 0.1%;
3, scope: volume flow: 10:1;Mass flow rate: 8;
4, work stress: pitot tube without functional: 20 mpa or less;Velocity-equalizing tube can be put forward: 10 mpa or less;
5, fluid temperature: 450 ℃ or less;
6, medium viscosity: 30 or less cp (crude oil);
7, material: pitot tube, three groups: a variety of grades of stainless steel (optional);
8, the main body tube, flange, stainless steel or carbon steel (optional).
Six, operation and maintenance:
The preparing work before put into operation:
1, sensors installed correctly:
Complete sensors installed in the line, must carefully check before put into operation, require welding is firm, in the right direction, not leak, strictly proper insertion depth, etc.
2, instrument calibration:
Sensor matching instrument differential pressure transmitter and intelligent flow integrating instrument (there could be pressure transmitter and temperature transmitter), etc.Must be after inspection and calibration, can be put into use.The instrument measuring range to conform to the requirements of the sensors and the measured medium.Such as measured zui large air flow Qmax = 5000 m3 / h, the calculation to calculate differential zui big value of sensor
Delta Pmax = 0.6 Kpa, the measuring range of differential pressure transmitter should be set-up of 0 ~ 0.6 Kpa, the corresponding output 4 ~ 20 madc current signal.For universal, flow totalizer.especially should according to the real-time flow range, differential pressure range, medium density, temperature, pressure, flow operation requirements, etc., prior programming configuration, input totalizer.especially can correct operation and make sure totalizer.especially display traffic.
3, instrument wiring correct:
Sensor and differential pressure transmitter, flow integrating instrument of measuring system, such as supporting the power cord, signal output to the input line between instrument, control and alarm, etc., in various instrument wiring board (also known as terminal board) are clearly marked, is must confirm and don't choose to use, before the operation of the instrument connection to check again and again.In order to do the preparing work before put into operation, in addition to read the instruction for use, you should also read the differential pressure transmitter operation instruction handbook ", "operation instruction handbook" intelligent flow totalizer.especially etc, comply with the instruction manual for the guidance of work.
Operation of work:
1, the measurement system is closed:
Operation of preparatory work has been completed, the medium to be measured with flow process piping, sensor measuring system is temporarily closed, then should make three balancing valve is fully open valve group, high pressure valve P l P2 and low pressure valve closed.Meter is in a state of power supply, preheating about 15 minutes.
2, open measurement systems:
Instrument after preheating, open measurement system.Open the Pl on three valve group and P2 valves, balance valve is still in the open.At this time, the differential pressure transmitter has filling the measured medium (gas or liquid), open the drain valve on the transmitter, quickly closed after discharge dirty liquid or gas.Then close three the balance valve on the valve group, transmitter that is entered into a state of differential pressure measurement.Output and the corresponding signal current differential delta P I delta P from the signal current value (m A) to calculate the pressure delta P values (KP) A.Also flow totalizer.especially into work state, show the measured medium flow.
If the above work all goes well, the flow meter works well, commissioning work is complete, delivery production use.
Seven, form a complete set of scheme selection:
1, ZW - 3051/1151 dp series differential pressure transmitter or other types of differential pressure transmitter;
2, ZW - 308 series pressure transmitter or other type of pressure transmitter;
3, temperature transmitter, or other type of temperature transmitter;
4, ZW - XMJA series or other types of flow totalizer.especially flow integrating instrument;
5, composed of intelligent velocity-equalizing tube flowmeter, pressure compensation can take temperature, and can show the instantaneous flow and cumulative flow medium medium temperature, the pipe, the pipe pressure and differential pressure equivalent, equipped with communication interface and 4 ~ 20 ma output.
Eight, device:
1, velocity-equalizing tube flow sensor 1;
1 2, velocity-equalizing tube flow sensor operating instructions;
3, 1 certificate;
4, form a complete set of transmitter instrument and manual and certificate of approval (which can be ordered by the users themselves).
Nine, method of use:
1, to the correct selection of points section, to ensure the measuring point straight pipe in air flow smoothly.Therefore, measuring the cross section from the flow direction of the bend, variable diameter abnormity tube such as local components more than four times the pipe diameter.From the downstream direction of local bend, the structure of the variable diameter should be greater than 2 times the pipe diameter.
2, when measuring the total pressure hole on the airflow direction, shall be to point to the pole.Measurement point insertion hole should avoid air leakage, and can prevent the airflow interference on the cross section.With pitot tube can only be measured on the pipeline section velocity of one point, because of the uneven distribution of cross section flow, so this section should be more measuring points, in order to calculate the average.
3, before use the smooth general characteristic test.Small static pressure hole check, don't make the impurities clogging pores after use clean the tube inside and outside, to ensure the good condition for a long time.
4, standard pitot verification period of five years.

Ten, selection of code:

Model tag method: ZW - PTG - DN/pitot tube flow sensor

DN - - (㎜) such as DN500 nominal diameter of 500 ㎜ nominal diameter.

Eleven, design selection and order notes:

1, the name of the measured medium;

2, the biggest, commonly used, flow range (m3 / h);

3, work pressure (Mpa), temperature (℃), the maximum pressure (Mpa), upper and lower temperature (℃);

4, medium density, viscosity,

5, pipe material, inner diameter, outside diameter;

6, the pipe laying and local resistance.

7, you need to display instrument of the measurement and control of form a complete set, please refer to the corresponding specifications, choose the right model or the information provided by our company technical personnel according to your designs for you selection.

8, if you have special want to, please contact our sales department.

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.