Pipeline power meter

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Power of the flowmeter adopted completely aerodynamic engineering structure design, is a precision, …

Power of the flowmeter adopted completely aerodynamic engineering structure design, is a precision, reliable efficacy and has reached a remarkable degree of the sensing element.

1, power meter
Veolia, flowmeter is suitable for gas, liquid and steam flow of high precision measurement.Was a powerful differentiae pressure, rate of average flow sensor, through the sensor in the fluid produced by the differential pressure flow rate measurement.Power and reflect the actual velocity of the fluid, and its accuracy is + / - 1.0, repeatability of + / - 0.1.Output power of the outstanding advantages are: a very stable, no differential pressure signal of pulse

2, the design characteristics of the probe
Bullet cross section shape of probe can produce accurate pressure distribution and fixed flow separation point;Located in the probe lientang, fluid separation point on either side of low pressure before selecting pressure hole, can generate stable differential pressure signal, and effectively prevent.Internal integration structure can avoid leakage of signals, improve probe structural strength, maintain a long-term and high precision.

3. The power design anti clogging the probe power flow sensor with its remarkable trap design, thoroughly get rid of the pig and plug flow probe the disadvantages of easy jam, such as make velocity-equalizing tube flow sensor to collect level has reached an unprecedented height.

Probe high pressure in the front of the hole will not be plugged probe form high, pressure slightly higher than the duct static pressure, prevents the particles to enter.Please note: the probe on the high pressure from pressure hole fluid velocity is zero, no object into the hole.When switched on, the fluid in the pipeline under the action of static pressure, into the pipe bending, quickly formed a pressure balance state.When pressure balance formation fluid in high pressure pipe inlet, detour, no longer into the bend.

4. The advantages of the probe
To measure a variety of media, wide range of applications
Low precision, range than the big
Low probe hole held in nature
To measure the signal's stability, low volatility
Low low pipe pressure loss of the permanent
Unique high strength low bullet shaped monolithic double cavity structure
Low installation cost is low, basic maintenance free
To online installation and maintenance

5. The characteristics of the power and velocity-equalizing tube flow sensor
Low and stable signals
Power and low voltage take pressure on both sides of the hole is located in the probe lientang, between the fluid and probe separation point, away from the eddy current range.
Long-term high precision low excellence
Can ensure the long-term stability of the accuracy of power, this is because:
(1). It is not affected by wear, dirt and oil.
2. The structure with no moving parts.
(3). On the design in addition to jam.In the front of the probe, high static pressure area around the probe, make the high pressure hole will not be blocked.Most importantly, low pressure hole on either side of the probe lientang, fluid from the surface of inclined swept through, the protection of the low pressure hole will not be swept, and the other probe to congestion, because of their low pressure with hole in the impurities gathered in the low pressure range.

Low minimum cost of installation
(1). Only need a few inches of welding line, complete the installation is very simple and fast.
2. Application of special tools, can be achieved with a line installation.
(3). All the valve and all kinds of instrument interface for simple assembly, need very low assembly cost.

Low very low operating cost
(1). It is a kind of contracted design of throttle, as a kind of plug flow probe, the power of the lowest operating cost.
2. http://www.zgyb18.com/index.html makes very low power and flowmeter permanent pressure loss, typically less than 0.7 KPa
(3). An orifice plate components produced by the permanent pressure loss more than 14 kpa
(4). Compared with orifice, power and energy loss was reduced by 95.

When the power of continuous work, fundamentally eliminate the possibility of the wall, but in the following cases, the power, still should pay attention to prevent:
(1). When the pressure pipe leaking, probe and pressure equilibrium is destroyed, impurities in the smaller diameter particles could enter
Hole.
2. When the pipeline was shut down, because the molecular Brownian motion, small particles of impurities may enter the hole.
Key frequently, (3). System formed in high, small particles of impurities may enter the hole, accumulate over a long period, it is possible to probe the jam.
(4). Medium contains a large amount of tar, algae, or containing fibrous material, may also cause the probe blockage.

6, application of new technology
The joint power of original design with the valve...A new design concept provides a new concept, built-in instrument in instrument tapping globe valve
1. Installation and maintenance easier.
2. Reduce the number of assembly parts, the hardware connection
Cost reduction.

Fast installation system
Quick insert and pull out
Low sealing drive system to avoid damage to components
The installation of low can respectively applied to multiple probe
All the installation does not exceed 1 hour

Two main technical indicators, the power flow meter

1, the power flow measurement system performance indicators
Accuracy: + / - 1 repeat accuracy: + / - 0.1
Apply pressure: 0 ~ 40 mpa applicable temperature: 180 ℃ ~ + 550 ℃
Measurement limit: depends on the strength measurement probe lower limit: depends on measuring the minimum differential pressure requirements
Quantity than: more than 10:1
Suitable diameter: 38 mm ~ 9000 mm round pipe, square tube
Applicable medium: full tube, a one-way flow, one-way gas, steam and liquid viscosity is not more than 1 0 centipoise
Power of the range and its widely used, it is used for various kinds of gas, liquid and steam
The measurement of steam, the following is a typical application of medium.

Gas/liquid/vapor
Gas/water/saturated steam
Compressed air/water/superheated steam boiler
Gas/in addition to the brine
Hydrocarbon gas/liquid hydrocarbons
The hot air/liquid at low temperature
Producer gas/liquid of thermal conductivity

Working principle of the three, and power meter

When the fluid flows through the sensor, a high pressure generated in the front of its distribution area, hydrostatic pressure slightly higher than the area of high pressure pipe.According to the principle of Bernoulli equation, to speed up the speed when the fluid flows through the probe, the probe at the back of the produce a low pressure area, the pressure is slightly lower than area of low pressure pipe of the static pressure.Fluid from the probe through the vacuum on the probe at the back of the part, and appear on both sides of the probe vortex.Average flow cross section shape of probe, the condition of surface roughness and low pressure hole location is the key to probe performance factors.Low voltage signal is stable and accurate, is crucial to average probe of precision and performance.The average power flow probe can be detected accurately by the fluid produced by the average speed of the average differential pressure.The average power flow probe in the rule of high and low pressure area is in a certain arrangement to take more pressure hole, made it possible to accurately measure the average velocity.

Four, and the power meter measurement principle

ZY - HLV flowmeter were in jiangsu power meter automation instrument co., LTD., a plug flow measuring instrument.In pipeline to insert a force sensor, when the fluid flows through the sensor, a high pressure generated in the front of the incident flow direction distribution area, a low pressure area in the back.Sensors in the high and low pressure area is arranged according to certain rules for the average for the three more to take pressure hole, measured total pressure of the fluid Including the static pressure and average velocity pressure Pl and static pressure P2.Differential pressure transmitter, introduced the P1 and P2 respectively, measuring the pressure delta P = (P1, P2, delta P reflects the size of the average speed of fluid, fluid flow can be calculated.

Five, the power of the operation and maintenance of flowmeter

1, 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) the 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 air Qmax = 5000 m3 / h, maximum flow rate through the calculation to calculate the maximum differential pressure 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) the instrument connection 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 power of the flowmeter operation instruction handbook ", you should also read the differential pressure transmitter operation instruction handbook ", "intelligent flow integrating instrument operation instruction handbook" etc, comply with the instruction for the guidance of the work.

2, flowmeter commissioning work

(1) measuring 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) measurement system open:

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.

3, flowmeter maintenance of http://www.zgyb18.com/index.html

Power meter maintenance work less, power integrated sensor free maintenance.Form a complete set of secondary instrument maintenance quantity is small, only need to make some zero check, such as range test of routine maintenance.But, on some occasions, the use of the measured medium condition and design deviation is large, we have to make some field parameter correction etc.Name several ways as follows:

(1) discontinuous production process, the continual occasions.Flowmeter maintenance should be paid attention to.When shut down when the production process, should open the three valve group of balance valve, high pressure valve P l P2 and low pressure valve closed, differential pressure transmitter in the differential input state.When resume production process, should refocus on the P 1 and P2.Close the balance valve and differential pressure transmitter input differential pressure measurement is resumed.

(2) for some of the dust content in the number of measured medium, such as gas (not clean), industrial water (sand), wet gas (dust) and so on, can block the probe is expected to take pressure hole, should be regularly to purge.Introduction of the compressed air purge method sensor counter blowing, stick bore high pressure and low pressure off the dust of the prevent the blocking phenomenon.Purge time less than 30 seconds at a time, in this period of time should be guided to the differential pressure transmitter pressure pipeline is shut, purge open again.On the occasion of individual is not allowed to blow into the compressed air, such as high temperature gas, usable to blow off steam.