在使用安装前，应先检查其技术参数如：测量范围，精确度等级，额定工作压力，温度等参数是否符合使用要求。 Before using the glass rotor flowmeter , check its technical parameters such as: measurement range, accuracy level, rated working pressure, temperature and other parameters that meet the requirements for use. Before installation, the top lining for transportation protection should be removed.
And check the cone tube for damage, whether the float can move up and down freely, and it can be installed only after it is normal. The newly installed pipeline should be flushed before the glass rotor flowmeter is installed. The minimum graduation value of the rotor flow meter should be below and installed vertically on the vibration-free pipe.
The angle between the centerline of the rotor flowmeter and the plumb line should not exceed 5 degrees. Large-caliber flowmeters are heavy. To avoid pipe bending, measures such as reinforcement and support can be taken if necessary. It is also necessary to prevent the rotor flowmeter from being subjected to excessive tension, pressure, and torque during installation. Lest it ever happen
Large external forces can damage the cone. According to different working conditions in use, if necessary, a filter should be installed upstream of the rotor flowmeter to prevent contamination by impurities and block the rotor flowmeter. If the fluid is unstable and has a pulsating flow, a buffer can be installed to ensure the good measurement of the rotor flowmeter.
To eliminate pulsating flow. When the rotor flowmeter is in use, first slowly open the control valve on the upstream pipe of the flowmeter, and then use the regulating valve to adjust the flow rate, so as to avoid the sudden rise of the float to cause damage to the cone tube. In order to ensure the measurement accuracy of the rotor flow meter in use,
It is recommended that the common flow rate of the measured fluid is selected to be more than 60% of the upper limit of the flow rate of the rotor flow meter.
是一种使用简单、读数方便、用途十分广泛的瞬时流量测量仪表。 The glass rotor flowmeter is a kind of instantaneous flow measuring instrument which is simple to use, convenient to read and very versatile. In the field of environmental protection equipment and instruments, the amount is more than 30,000 units / year. Therefore, it is extremely important to choose and use this instrument.
I. Variety and selection of glass to flowmeter
The glass rotor flowmeter can be divided into eight types: ordinary type, ribbed vascular type, micro flow and small outline type, corrosion resistance, laboratory type, thermal insulation type, alarm type and high pressure resistance type according to its use and applicable range. series. According to the instrument series spectrum developed by the country,
No matter which series, it includes a maximum of 12 calibers from 1mm to 100mm. The measurable flow range is: liquid (water) 0.1ml / min ～ 40m3 / hour, gas (air) 1ml / min ～ 1000 Cubic meters per hour. Glass rotor for environmental protection equipment
The caliber of the flowmeter generally does not exceed 10 mm, and the measured flow is within a small flow range.
The selection of glass rotor flowmeter can be considered from the following aspects.
1. The object of measurement. That is to measure the type of medium, pressure, and chemical properties. For liquid and gaseous media, for corrosive media, a corrosion-resistant flowmeter should be selected.
2. The performance of the flow meter itself. After the above conditions are determined, generally speaking, if there is no major change in price, the needle valve is preferred to be placed on the upper part of the flowmeter; those with larger flow holes are directly flow-scaled; simple structures; smaller external dimensions, etc .
If it is a small flow range, you can use the ball float type, because it is stable during measurement, not easy to accumulate dust, high accuracy, and good interchangeability.
3． Select based on price. Generally speaking, high accuracy and high price. To select the accuracy level of the instrument according to the measurement purpose, if you only need to control the throughput of the measurement medium and adjust it after trial operation, you must always stabilize the throughput in the future, then the accuracy is secondary.
的刻度修正 Calibration of glass rotor meteorometer
The calibration of the glass rotor flowmeter is obtained by the factory under the conditions of the factory using water and dry air close to the ideal fluid as the medium. However, there are two situations in which the scale value of the flowmeter cannot be used directly:
Air, the second is measured and although the medium is water and air, its state (temperature, pressure) is different from the scale state. In this way, when using a flow meter, in order to obtain a correct measurement result, a problem arises that the scale value needs to be corrected. Therefore, solve the glass rotor flow
Calibration correction is the key to good use of this meter.
Considering that environmental protection instruments use rotor flowmeters to measure the flow of gaseous media, only the density correction in gaseous media measurement is discussed below. Because the viscosity of the gaseous medium is small, the viscosity effect is omitted in the discussion. Practice has proved that this does not affect the accuracy after the correction.