KHDTB type Deertaba is the use of differential pressure flow meter works, plug-in installation method designed a flow sensor. The working principle, which is a special kind of throttling device, which output is a differential pressure. Pressure by the sensor probe (or probes), before and after the probe has several holes in two rows impulse unevenly distributed (to take pressure pipe diameter Φ20, low-pressure hole aperture Φ8). Cited by two rows of holes to form a differential pressure after the pipe from top to bottom (left to right) of different pressures (velocity) of the average, and thus can calculate the mass flow or volume flow. First, the scope of a nominal diameter: 25mm≤DN≤6000mm 2, PN: PN≤25MPa 3, medium temperature: t≤650 ℃ 4, Accuracy class: 0.5, 1, 1.5 Second, the structure KHDTB type Deertaba flowmeter is detecting lever taps composition, it traverses the pipeline inside the tube axis perpendicular to the surface of the detection lever welcome stream has more than the total pressure detecting holes in the detection lever back surface has a multi-stream a static pressure sensing holes, respectively, and hydrostatic pressure pipe connecting pipe leads from the total pressure of the guide, based on the total pressure and static pressure differential value is calculated through the pipeline flow. Third, the theoretical basis of KHDTB type Deertaba flowmeter is developed based on the principle of pitot speed, which is determined by the effective cross-sectional area of ??the flow velocity and the average product of the pipe conduit. 1, the probe cross-sectional shape: power bar for bullet-shaped, Deertaba class diamond, diamond-shaped cross-section in the class to make high, low district boundaries more obvious. 2, the probe rod hole to take pressure position: the power bar total pressure hole in the front end of the rod, the rod hole in the side wall static pressure; total pressure orifice flowmeter is also Deertaba rod front end, but the static pressure hole was in pole backend, measuring back pressure (negative pressure). Therefore, under the same diameter and flow conditions, the differential pressure produced Deertaba probe, the probe than the power bar to a large number, about 20% -40% bigger. This is a significant advantage Deertaba flowmeter. Several installation Deertaba flowmeter: High KHDTB Deertaba probe Accuracy: third-party testing, and according to the latest data show that, although in a relatively short straight sections, but also to achieve 2% accuracy. Reach 1% precision straight pipe than the average product is much shorter, as shown below. Repeatability of 0.1%. Since the pressure loss is small, less wear on the probe, as long as proper installation, high accuracy can be maintained for a long time. Low operating costs: Due to the pressure loss is small, so that the power loss in the pipe is small, generally speaking, one of only a very average running costs orifice speed tube. Installation work is small: Because the sensor is a plug-in work, with the installation side to make, simple features. For most of the path just open a small hole in the pipeline. Section Hao Deertaba KHDTB25, pore diameter of 28 mm, KHDTB50 to 54 mm, and the probe pipe and pipe welding, the basic completion of the on-site installation work the amount of 40% of the orifice plate is installed. According to many years of experience in the installation, opening 5 minutes, the welding probe casing 20 minutes, 10 minutes into the fixing probe, three-valve five minutes to install, install differential pressure transmitter 10 minutes, wiring 10 minutes, the whole process will only take about 60 minutes (integration). Integration / split installation freedom of choice: Deertaba probe is the integration of a full sense of the probe, whether measured medium is a gas or a liquid, or superheated steam temperature can be measured differential pressure sensor, temperature and pressure and differential pressure transmitters on a single probe mounting, connection between the probe and the differential pressure transmitter has more than 10 kinds of (select), specifically for superheated steam condenser, there is a direct connection to the transmitter oval flange, there are simple R1 / 2 "external thread, providing split / integrated installation of all kinds of connections that can meet a variety of needs. For superheated steam, most products require separate installation, the user must own with condensation ., and other accessories and Deertaba together with a condenser, a shut-off valves or ball valves are together providing safe, reliable, simple and feasible, is truly integrated probe mass flow calculation:. KHDTB Deertaba flow calculation is basically in accordance with ENISO 5167 -1 standard (prior DIN952 standard method for calculating the orifice) is specified for each particular method of calculating the following formula: where: Qm: the mass flow rate, dimensions of kg / s; ζ:. probe resistance parameter (block coefficient), dimensionless; (each probe has a value,) ε in the calculation report: expansion coefficient; When incompressible media, when measured as 1 gas needs to be added, look-up table dimensionless; d:. pipeline diameter, in meters dp: differential pressure, measured parameters, in units of pa = n / = kg / s2m ρB:? the density of the medium at operating conditions, in units of kg / m3 Therefore, according to the differential pressure, the inner diameter of the probe itself to provide blocking factor and media work can calculate the mass flow density. The problem is that the work density, temperature and pressure compensation may be required by the look-up table (ρB = f (t, P)), or by calling (using) the majority of PLC or DCS built-in standard subroutine for calculating the density of the gas, the need to identify specific coefficients of expansion hole large easy to block: For the flue gas with a measured or particles / liquid measurement, blocking problem is that most users concerned about the company guarantee, if the medium is not greater than the dust 130mg / m3, for SZ Deertaba probe does not require any maintenance and purge. From the point of view of fluid mechanics, in the fluid composition of any wedge-shaped, fluid accumulation occurs in the front the pressure increased, the pressure decreases in the wedge, dust in motion regardless of how high pressure, low pressure, however small, will likely enter the wedge in the hole in the fluid at rest, due to Brownian motion, the dust will enter the wedge inside the hole. So the question is not the pressure level, nor to any kind of cross-section, but rather how to make the dust out, do not pile up. Undoubtedly, the timing purge is a solution. hole in the probe on the company's distribution and pore a lot of research, large aperture (8 mm) foreign body easily into, but also easy out; two holes near the top and bottom edges of the probe (pipe edge), foreign body is not easy to accumulate small aperture, it will cause is not easy to get into, not easy out. The feed is absolute, how much is just a matter of time. Installation requires an installation of the detection lever measurement section should be straight, its upstream and downstream straight pipe length referring to the length specified in the table. No. upstream side of the local resistance elements upstream side of the downstream side of the form there is no rectifier rectifier and detection lever is not in the same plane in the same plane with the detection lever 1 has a 90 ° elbow or tee 7D 9D 6D 3D 2 in the same plane with two a 90 ° elbow 9D 14D 8D 3D 3 with two 90 ° elbows in a different plane 19D 24D 9D 4D 4 pipe diameter changes (entry or expansion) 8D 8D 8D 3D 5 partially open gate valve, ball valve or other throttling Valve 24D 24D 9D 4D Note: 1, D is the nominal diameter of the pipeline, the data is given from a second length of the elbow. 2, the insertion angle of the position detecting lever allow deviation Figure. 3. For vertical pipes, detection lever can be installed in any position along the horizontal pipe of 360 ° on the circumference of the pipe, high and low pressure pipe joints should be cited in the same horizontal plane. For horizontal pipe, the liquid in the measurement of the position of the detection rod is inserted should be in the horizontal center line of the pipe cross-sectional view in the range of 45 ° or less; the position of the detection rod is inserted should be in the horizontal center line of the pipe cross-sectional view in the range of 45 ° or more when the measuring gas; Measurement When the vapor detection lever should be inserted horizontally, shown in Figure: 4, hole size Φ35 pipe. 5, the compensation pressure transmitter front straight pipe, temperature transmitters (or platinum resistance) is mounted at a distance 2D throttling device on the rear straight pipe. Online installation and removal type Deertaba: Unable to shut down for part of the installation of the measuring point and the medium containing the impurities can be used online installation and removal type Deertaba. Online installation and removal type Deertaba can be installed without shutdown or maintenance probes, especially for the installation of the measuring point can not be discontinued or dirty media need regular maintenance of the measuring point. It is available in single-pole double-driven and application-driven high-pressure lever. Features: You can install, remove, repair in case of non-stop, and cleaning. Condition: generally used for low pressure air, water, gas, steam and other media. Note: When installing or removing the line to meet t≤120 ℃ P≤2.5MPa form structure as shown: