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technical article
Things to be aware of when installing a throttling device
2011-8-11 15:39:27

)正确安装节流件;( 2 )正确安装好取压装置外;( 3 )差压信号针路的安装。 There are three main aspects of installing the throttling device of the electromagnetic flowmeter : ( 1 ) correctly installing the throttling part; ( 2 ) correctly installing the pressure taking device outside; ( 3 ) installing the differential pressure signal needle. The last point is that the installation of the differential pressure signal needle is particularly important because the differential pressure signal is the flow signal output by the throttle device of the electromagnetic flowmeter . Whether the differential pressure measurement is accurate or not directly affects the measurement accuracy of the entire throttle device. 锥流量计节流装置到差压变送器的差压信号管路也十分重要。 In order to accurately measure differential pressure, in addition to high-accuracy differential pressure transmitters, differential pressure signal lines from V- cone flowmeter throttling devices to differential pressure transmitters are also very important. If the differential pressure signal pipeline is incorrectly installed, even if a high-precision differential pressure transmitter is selected, the differential pressure value cannot be accurately measured, and even the operation of the throttling device may be affected. The general requirement for correct installation is that the transmitted differential pressure signal should not require additional errors due to the pipeline, and can ensure the safe operation of the throttling device. Therefore, when setting the differential pressure signal pipeline, the following items should be noted:

应按最短的距离设置导压管,其长度最好在16m以内,一般不要超过50m.其内径要大于6mm 1. The pressure guiding tube should be set according to the shortest distance, its length is preferably within 16m , and generally does not exceed 50m. Its inner diameter must be greater than 6mm . In general, the longer the signal line, the larger its inner diameter should be. For gas, water vapor, and water, the inner diameter can be smaller, and for measuring fluids, especially when measuring dirty media, the inner diameter of the impulse tube should be larger.

应垂直或倾斜安装导压管,其倾斜度不得小于1:12 ,以便能及时排出气体(测量液体介质时)或者凝结水(测量气体介质时) 2. The pressure guiding tube shall be installed vertically or obliquely, and its inclination shall not be less than 1:12 so that the gas (when measuring liquid medium ) or condensed water (when measuring gas medium ) can be discharged in time. For viscous fluids, the slope should also increase. 时,应该将导压管分段倾斜,并在各最高点和最低点分别装设集气器或排气阀和沉降器或排污阀。 When the differential pressure signal transmission distance is greater than 30 mm , the impulse pipe should be tilted in sections, and a collector or an exhaust valve and a settler or a blowdown valve should be installed at the highest and lowest points respectively.

应能防止有害物质,如高温介质,腐蚀性介质等进入筹压计。 3. It should be able to prevent harmful substances, such as high-temperature media and corrosive media, from entering the manometer. A condenser should be used when measuring high-temperature vapors, and an isolation container should be used when measuring corrosive media. If the medium may freeze and freeze in the signal pipeline, heat preservation or heating devices should be installed along the signal pipeline. However, special care should be taken to prevent errors caused by uneven heating or partial vaporization of the two signal lines.

当被测介质为液体时,应防止小气体准入导压管;当被测介质为气体时,应防止水或脏污物进入导压管。 4. When the medium to be measured is liquid, prevent small gas from entering the pressure tube; when the medium to be measured is gas, prevent water or dirt from entering the pressure tube.