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Flow meter
Delta flowmeter

是运用差压式的工作原理,插入式的安装方法设计而成的一种流量传感器。 DXDTB Delta Taba flowmeter is a flow sensor designed by using the differential pressure working principle and plug-in installation method. ,其输出是差压。 In terms of working principle, this is a special throttling device whose output is differential pressure. The sensor uses a probe (or probe) to take pressure, and there are two rows of impulse pressure holes (the diameter of the pressure tube is about Φ20, and the low-pressure diameter of the pressure hole is Φ8). 下(从左到右)的不同压力(流速)平均后形成了差压,进而可以计算出质量流量或体积流量。 The differential pressure is formed by averaging different pressures (flow rates) of the pipe from top to bottom (from left to right) through two rows of impulse holes , and the mass flow or volume flow can be calculated.
I. scope of application
1. Nominal diameter: 25mm≤DN≤6000mm
2. Nominal pressure: PN≤25MPa
3. Medium temperature: t≤650 ℃
4. Accuracy level: 0.5 level, 1 level, 1.5 level
Structure
是检测杆、取压口组成,它横穿管道内部与管轴垂直,在检测杆迎流面上设有多个总压检测孔,在检测杆背流面上设有多个静压检测孔,分别由总压导压管和静压导压管引出,根据总压与静压的差压值,计算流经管道流量。 The DXDTB Delta Taba flowmeter is composed of a detection rod and a pressure taking port. It crosses the interior of the pipeline and is perpendicular to the tube axis. There are multiple total pressure detection holes on the upstream side of the detection rod. Multiple static pressure detection holes are led out by the total pressure impulse pipe and the static pressure impulse pipe respectively, and the flow rate through the pipeline is calculated according to the differential pressure value of the total pressure and the static pressure.
Theoretical basis
是基于皮托管测速原理上发展起来的,它是通过管道的平均流速及管道的有效截面积的乘积来确定流量的。 DXDTB Delta Taba flowmeter is developed based on the principle of pitot tube speed measurement. It determines the flow rate by the product of the average velocity of the pipeline and the effective cross-sectional area of the pipeline.
1. Probe cross-sectional shape: Verabar is a bullet head shape, Delta Taba is a rhombus-like shape, and the rhomboid-like shape is cut to make the boundary between the high and low areas more obvious.
的全压孔也在杆前端,但静压孔却在杆的后端,测量背压力(负压)。 2. The position of the pressure hole of the probe rod: The full pressure hole of Verabar is at the front end of the rod, and the static pressure hole is at the two side walls of the rod. The full pressure hole of Delta Barometer is also at the front end of the rod, but the static pressure hole is at the rod. At the rear end, measure the back pressure (negative pressure).
Therefore, under the same pipe diameter and flow rate conditions, the differential pressure produced by the Delta Tab probe is larger than that of the Verabar probe, about 20% -40% larger. 的显著优点。 This is a significant advantage of the Delta Taba flowmeter .
的几种安装方式: Several installation methods of delta flowmeter :
Installation requirements

1. The measurement section where the detection rod is installed should be straight, and the length of the upstream and downstream straight pipe sections is as specified in the table below.

Serial number

Form of upstream local resistance

Upstream side

under
tour
side

Without rectifier

With rectifier

In the same plane as the detection rod

Not in the same plane as the detection lever

1

Has a 90 ° elbow or tee

7D

9D

6D

3D

2

Two 90 ° elbows in the same plane

9D

14D

8D

3D

3

Two 90 ° elbows in different planes

19D

24D

9D

4D

4

Pipe diameter change (close or expand)

8D

8D

8D

3D

5

Partially opened gate, ball or other throttle valve

24D

24D

9D

4D

*D为管道标称直径,所给出数据为距离第二个弯头的长度。 Note: 1 * D is the nominal diameter of the pipe, and the data given is the length from the second elbow.
2. The allowable deviation range of the angle of the detection rod insertion position is shown in the figure.
3. For vertical pipelines, the detection rod can be installed at any position along the pipeline's horizontal plane 360 ° along the circumference of the pipeline, and the high and low pressure impulse pipe joints should be on the same horizontal plane. For horizontal pipelines, the insertion position of the detection rod should be within 45 ° of the horizontal centerline of the horizontal cross section of the pipeline when measuring liquids; the insertion position of the detection rod should be within 45 ° of the horizontal centerline of the cross section of the pipeline when measuring gas; The detection rod should be inserted horizontally during steam, as shown in the figure:
4. The size of the hole in the pipe is Φ35.
在前直管段上, 温度变送器 (或铂电阻)装在后直管段上距离节流装置2D处。 5. The pressure transmitter for compensation is on the front straight pipe section, and the temperature transmitter (or platinum resistance) is installed on the rear straight pipe section away from the throttle device 2D.

Installing a dismantled delta bar online:
For some measurement points that cannot be discontinued for installation and media containing impurities, you can choose the on-line installation and removal of Delta Taba .
可在不停产的情况下安装或检修探头,特别适用于无法停产安装的测点或介质很脏需定期检修的测点。 The on-line installation and removal of the Delta Taba can install or repair the probe without stopping production, and is especially suitable for measurement points that cannot be installed or where the medium is dirty and require periodic maintenance. It is available in single lever drive type and double lever drive type for high pressure applications.
可以在不停产的情况下进行安装、拆卸、检修、清洗。 Features: Can be installed, disassembled, repaired and cleaned without stopping production.
通常用于低压空气、水、煤气、蒸汽等介质。 Applicable conditions: Usually used for low-pressure air, water, gas, steam and other media.
在线安装或拆卸时要满足t≤120℃ P≤2.5MPa Note: t≤120 ℃ P≤2.5MPa
The structure is shown in the figure: