DDTOP LGB Annubar Flow Meter

Description of DDTOP LGB

Because of the wide variety of flow measurement techniques and instrumentation types, and the complexity of the objects being measured, flow measurement instrumentation is technically complex to apply. It is very different from the traditional application of metrology measuring instruments – it is not simply to install the flowmeter, open the meter to run will necessarily be able to achieve the purpose of measurement. As most of the flow meters are medium contact type, it is necessary to ensure the safe operation of the instrument on the basis of the instrument, and strive to improve the accuracy of the measurement instrument and energy saving. This is not only to select flow meters with the required accuracy, but also to select a reasonable measurement method according to the characteristics of the measured medium.

Operating Principle

The principle of operation of an Annubar Flow Meter is the same as that of other differential pressure flowmeters, which is based on the principle of energy conservation in a sealed pipe. However, due to its unique structural design, the Annubar Flow Meter offers the following advantages.

• Unique rhombic single-piece, double-cavity structure: a metal-cavity structure made by special processing, which avoids the leakage or breakage between the chambers, caused by the multi-piece structure or welding process of other shapes of rheostat transducers, and increases the overall strength of the sensor part.
• It is suitable for measuring a wide range of medium, like gases/ vapors/liquids, and has a wide range of applications.
• High measurement accuracy and good repeatability – accuracy up to ±1.0% and repeatability up to 0.1%.
• Stable measurement signals with low fluctuations.
• Permanent pressure loss is very small, which is about 3% of full scale differential pressure and can be virtually ignored.
• Low installation cost and basically maintenance-free – the installation only requires a simple hole and welding on the pipe, with very low cost. There’re little moving parts overall and it’s basically maintenance-free.
• The temperature and pressure of the medium can be measured directly, and also the mass flow rate and standard flow rate of vapors and gases can be calculated.
• The choke (sensing) elements and transmitters are all common and freely interchangeable, saving the cost of spare parts. Optional intelligent, with HART communication, makes remote configuration possible.

Flow Meter Components

The Annubar Flow Meter consists of a primary choke (sensing) element, a transmitter, and a valve unit.

Measurement Principle

The Annubar Flow Meter is a differential pressure flow meter. Flow instruments based on the differential pressure principle have been in use for more than a hundred years so far. The differential pressure principle is based on the principle of energy conversion in a sealed pipe, which means that for a stable fluid, the flow rate is proportional to the square root of the flow rate of the medium in the pipe. As we know, the pressure decreases as the velocity increases. When the medium is close to the throttle, the pressure is P1; when the medium goes through the throttle area, due to the medium circulation area decreases, so the flow rate will increase, the pressure decreases to P2. When the flow rate changes, the differential pressure value between the two pressure ports of the flow meter will increase or decrease. When the flow rate is constant, if the throttling area is large, the resulting differential pressure will be large.

Features

1.Unique rhombic monolithic double-cavity structure avoids the chamber leakage or fracture caused by the multi-piece structure or welding process of other forms of sensors and increases the overall strength of the sensor part;

2.It can measure many kinds of medium, such as dry or moist gas, vapor, liquid, etc.

3.Probe materials have special 1.4528 and ha C4 alloys, specifically for a variety of strong corrosion medium;

4.Good plugging performance

5.It can be measured in both directions

6.Small permanent pressure loss, about 3% of the full scale differential pressure value

7.It can directly measure the temperature and pressure of the medium, calculate the mass flow rate of vapor and gas and the standard flow rate

8.Resistance (sensor) components and transmitters are all universal, free exchange, save spare parts costs. Intelligent, with HART communication protocol, can be remote configuration and calibration function.

Applications

Electricity Industry: Desalination Tanks

Technical specifications of DDTOP LGB

Note:

• Use the relevant software package to calculate the flow rate before selecting products.
• This catalog does not include transmitter selection information. if it’s needed, please consult the local agent or manufacturer directly.
• The flow meter can be installed vertically, but this should be specified in advance when ordering. For liquids, it is recommended to keep the flow direction from bottom to top, and for gases, it is recommended to keep the flow direction from top to bottom.

How to buy DDTOP LGB

• Model Selection Table

1. Inserted Type

2. Pipelined Type

Example

LGB-GSAS05 150CSR: Annubar Flow Meter; Process Connection: Flat Welded Flange; Sensor Type: Type A; Sensor Material: 316L; Piping size: DN50; Nominal Pressure: CL150#; Sealing Surf: RF; Pipe Material: Carbon Steel; Pressure Port: Threaded; Openings: On Side.