4 - 20 mA Balanced Flow Meter Intelligent Wedge Flowmeter For Nitric Acid

Wedge Flowmeter is a new type of throttling differential pressure flow measuring instrument of vacorda instrument. It can carry out high-precision flow measurement under the condition of high viscosity and low Reynolds number (Reynolds number > 500); It has incomparable advantages and irreplaceable role in the flow measurement occasions with low flow velocity, small flow and large pipe diameter.
Wedge flowmeter has the correction function of flow coefficient, nonlinear error, temperature change, density change and other parameters; The measurement accuracy can reach 0.5%; It can have field display and standard current signal (4 ~ 20mA DC) output, which can be easily used in automatic control system or networking with computer for automatic adjustment and control of flow or other parameters.
Wedge Flowmeter is mainly used for flow measurement of high viscosity (heavy oil, residue, diesel oil, engine oil, etc.), industrial gas (coke oven gas, blast furnace gas, generator gas, city gas), hydrogen, nitrogen, air, steam, sewage liquid and other media.
The flowmeter has the advantages of simple structure, no movable parts, not easy to be worn by fluid, stable and reliable working performance and long service life; Its measuring element and pressure taking device have special structure, no retention or blockage is formed when the fluid passes through, and the pressure loss is small. It is an ideal choice for high-precision flow measurement under the condition of low Reynolds number.

Product introduction: hd-lgx Wedge Flowmeter is a new type of flowmeter gradually becoming practical since the 1980s of Jiangsu Evergrande instrument. Its detection part is a V-shaped wedge (also known as wedge throttling part), and its smooth top angle is downward, which is conducive to the smooth passage of liquid or viscous liquid containing suspended particles and will not produce stagnation at the upstream side of the throttling part. Therefore, it is especially suitable for the measurement of volume flow and mass flow in petroleum, chemical and other industries.

Main Features
1. With good repeatability and high accuracy, the calibrated wedge flowmeter has an accuracy of grade 0.5.
2. It has self-cleaning ability and no stagnation area.
3 wear resistance, long service life and high reliability.
4. The permanent pressure loss is smaller than that of orifice plate.
5. In one structure, it is unnecessary to install the impulse pipeline on site, and it is directly connected with the pipeline by thread or flange. The construction is time-saving and labor-saving, and the maintenance is convenient.

Main Features
1.especially suitable for medium measurement with high viscosity, low Reynolds number and suspended particles or bubbles;
2.the measurement accuracy is not affected and limited by the dielectric constant and other characteristics of fluid medium;
3.the wedge-shaped part has special structural design, which has the function of diversion and anti blocking;
4.it has compensation functions for fluid viscosity change, temperature change, density change, etc;
5.resistance to vibration, impact, dirt, corrosion and explosion;
6.with bidirectional flow measurement function;
7.high measurement accuracy;
8.simple, firm, high reliability, convenient installation and low operation and maintenance cost;
9.no moving parts, no wear, no need to recalibrate in long-term use.

Main Technical Parameters
1.measurement accuracy: ± 0.5% ～ ± 1.0%
2.long term operation accuracy: 0.2% f.s/y.
3.minimum flow rate: 0.01m/s.
4.service life: up to ten years.
5.range ratio: ≥ 10:1
6.application range of Reynolds number coefficient: the lower limit is 300 and the upper limit is 1 × Above 106.
7.upper limit of measured liquid viscosity: 500MPa · s.
8.working pressure range: - 0.1 ~ 60MPa.
9.operating temperature range: - 50 ~ 560 ℃.

Precautions for Wedge Flowmeter Installation
1. Generally, the wedge-shaped flow sensor is equipped with front and rear measuring tubes, which can be installed and used horizontally or vertically. When the sensor is installed on a vertical pipe, the fluid shall flow from top to bottom. When measuring liquid, pay attention to make the differential pressure transmitter eliminate bubbles everywhere, so as not to cause zero drift of the instrument;
2. The upstream and downstream side of the sensor shall be equipped with a straight pipe section. The inner wall of the pipe shall be smooth, clean and free of attachments. Only the length of the pipe section is shown in the table
3. When installed horizontally, the wedge-shaped differential pressure element shall be 90 degrees from the center line of the pipeline. For vertical installation, due to the slight static pressure influence between pressure tapping points, attention must be paid to the zero adjustment of differential pressure transmitter.

Product Parameters

Product Image

Working Principle:
V-cone flow meter is a differential pressure type flow measurement device. So far it is more than 100 years since all kinds of flow measurement device that based on pressure differential theory been used. Pressure differential theory is based on energy conversion principle in sealed piping, means that to the steady liquid, flux and flow velocity's square root is direct ratio. We know that pressure will reduce when velocity increase, when medium approaches to cone the pressure is P1, but when medium is passing to cone's throttled area, because passing area reduced, speed increased, pressure reduced to P2, both P1 and P2 are connected to differential pressure transformer through pressure mouth. When flow rate is changed, the pressure differential value will increase or decrease accordingly.

Features
1.Low installation requirement: Rectifying behavior changes the velocity distribution, eliminating the eddy current and blind space. upstream straight pipe 0-30D, downstream straight pipe 0-1D. 2. Turndown ratio : 10:1 (usually);50:1(maximum)
3. Small pressure loss and signal stability: V-cone differential pressure signal is high-frequency low-amplitude signals. When the same β value, the pressure loss is 1/3~1/5 of orifice plate's and signal fluctuation is 1/10 of orifice plate's.
4.Strong resistance against wear: After the streamline V cone is throttled, the vacuum effect will be generated on the surface of V cone to keep the V cone from being worn easily.
5.Automatic cleaning, no block, no adhesion: the complete purging design of V cone avoids the settlement of residue, coagulation or particle.
6.Long-standing favorable stability: the value of β can remain the same for long and the accurateness in measurement can be ensured for a long period.
7.High precision and good repeatability: accuracy:±0.5% F.S; repeatability:±0.1% F.S
8.Wide range of the value of β: the unique geometrical shape of V cone flow sensor allows wide range of the value of β.
9.Type specification complete, multi-choice of installation:pipeline, flange tapping, wafer and plug-in.

10.Wide range of nominal diameter: φ15~φ2000 (1/2"~120")or customize.
11.The ability to measure high temperature and high-pressure medium:maximum working temperature 700℃; maximum pressure 42MPa.
12.The ability to measure the dirty medium (coke-oven gas, blast furnace gas, feed stock and residual oil)
13.The ability to measure gas and liquid two-phase medium (moisture and condensed water)

Product classification and application

1.classification:

A:for installation: Pipe welding, flange , wafer and plug-in.

B:for pressure measurement methods:pressure tap, face flange pressure tappings, plug-in male flange pressure tappings
C:for medium and condition:basic type, high temperature and pressure type, temperature and pressure compensation type, anti-corrosive type and anti-adhesion type.

2.Application: metallurgy, chemical industry, Chemical fiber industry, petroleum, nature gas, power supply, Hydraulic, mines, machinery, materials industry , city energy, environmental monitoring.

3.Conditions:

nominal diameter: φ15~φ2000, flow rate:≥0.1m/s, working pressure:-0.1MPa~42MPa, working temperature:-160℃~700℃, environmental temperature≤85℃.

4.Applicate for many kinds of fluid:

Besides of normal gas ,liquid and steam,it also applicate for all kinds of gas,liquid and steam with high dust ,high suspended solids,high viscosity, strong corrosive,crystallize and supersaturated.

5.Typical fluid: