KH-LWGY turbine flowmeterIt is a new generation of turbine flowmeter that has absorbed advanced technology from domestic and foreign flow meters and has been optimized for design. It has the characteristics of simple structure, lightweight, high accuracy, good reproducibility, sensitive response, and easy installation, maintenance, and use. It is widely used for measuring liquids in closed pipelines that do not corrode stainless steel 1Cr18Ni9Ti, 2Cr13, corundum AI2O3, and hard alloys, and have no impurities such as fibers or particles. The working temperature has a kinematic viscosity of less than 5 × 10-6m2/s. For liquids with a kinematic viscosity greater than 5 × 10-6m2/s, the flowmeter can be calibrated for real liquid before use If paired with display instruments with special functions, it can also perform quantitative control, over limit alarm, etc., making it an ideal instrument for flow measurement and energy conservation The KH-LWGY turbine flowmeter sensor is a precision flow measurement instrument that can be used in conjunction with the corresponding flow integrator to measure the flow rate and total amount of liquids.Selection of liquid turbine flowmeter: Turbine flowmeter

Widely used in the fields of petroleum, chemical, metallurgy, scientific research and other metrology and control systems. Turbine flow sensors equipped with sanitary fittings can be applied in the pharmaceutical industry. The integrated turbine flowmeter has an explosion-proof design and can display the total flow rate, instantaneous flow rate, and flow saturation percentage. The battery adopts a long-lasting lithium battery, and the service life of a single function odometer battery can reach more than 5 years, while the service life of a multifunctional display meter battery can also reach more than 12 months. The integrated meter head can display a wide range of flow units, including cubic meters, gallons, liters, standard cubic meters, standard liters, etc. It can set fixed pressure and temperature parameters to compensate for gases. In situations where pressure and temperature parameters do not change significantly, this instrument can be used for fixed compensation accumulation. The technical performance of liquid turbine flow meters can be calibrated using real flow for hydraulic oil, engine oil, and small-diameter specifications with high viscosity.Selection of liquid turbine flowmeter: Turbine flowmeter

KH-LWGY series turbine flowmetercharacteristic:

·High precision, generally up to ± 1% R, ± 0.5% R, and high-precision models up to ± 0.2% R;
·Good repeatability, short-term repeatability can reach 0.05%~0.2%, precisely because of its good repeatability, such as frequent calibration or online calibration can achieve * accuracy, it is the preferred flowmeter in trade settlement;
·Output pulse frequency signal, suitable for total measurement and computer connection, no zero drift, strong anti-interference ability;
·Can obtain high frequency signals (3-4kHz) with strong signal resolution;
·Wide range, with a medium to large caliber of up to 1:20 and a small caliber of 1:10;
·Compact and lightweight structure, easy installation and maintenance, and high circulation capacity;
·Suitable for high voltage measurement, there is no need to open holes on the instrument body, making it easy to make high voltage instruments;
·There are various types of sensors, which can be designed according to the special needs of users, such as low-temperature, bidirectional, downhole, mixed sand, etc;
·Can be made into an insertion type, suitable for measuring large diameters, with low pressure loss, low price, can be removed without interruption, and easy installation and maintenance.

Basic parameters, measurement range, and working pressure：

KH-LWGY series turbine flowmeterInstallation precautions:

Turbine FlowmeterProper selection is necessary to ensure better use of turbine flow meters. What type of turbine flowmeter should be selected based on the physical and chemical properties of the measured fluid medium? What are the diameter, flow range, lining material, electrode material, and output current of the turbine flowmeter? Can adapt to the properties of the measured fluid and the requirements of flow measurement
1. Precision functional inspection
The accuracy level and function of the instrument are selected based on measurement requirements and usage scenarios to achieve cost-effectiveness. For example, in situations such as trade settlement, product handover, and energy measurement, higher accuracy levels such as 1.0, 0.5, or higher should be selected; For process control applications, choose different accuracy levels according to control requirements; In some cases where only the process flow rate needs to be detected without precise control and measurement, a slightly lower accuracy level, such as 1.5, 2.5, or even 4.0, can be selected. In this case, a low-cost plug-in turbine flowmeter can be used.
2. Measurable medium
When measuring medium flow rate, instrument range, and caliber for general medium measurement, the full flow rate of the turbine flowmeter can be selected within the range of 0.5-12m/s for measuring medium flow rate, which is relatively wide. The selection of instrument specifications (caliber) may not necessarily be the same as the process pipeline, and should be determined based on whether the measured flow range is within the flow rate range. That is, when the pipeline flow rate is too low to meet the requirements of the flow instrument or the measurement accuracy cannot be guaranteed at this flow rate, the instrument port diameter needs to be reduced to increase the flow rate inside the pipeline and obtain satisfactory measurement results. [2]
install
In order to ensure the accuracy of the measurement of the turbine flowmeter, it is necessary to correctly select the installation position and method
Requirements for straight pipe section: The flowmeter must be installed horizontally on the pipeline (with a pipeline inclination of less than 5), and the axis of the flowmeter should be concentric with the axis of the pipeline during installation, with a flow direction of *. The upstream pipeline length of the flowmeter should have an equal diameter straight pipe section of not less than 2D. If the installation site permits, it is recommended that the upstream straight pipe section be 20D and the downstream be 5D.
Requirements for piping: The inner diameter of the upstream and downstream piping at the flowmeter installation point should be the same as the inner diameter of the flowmeter.
Requirements for bypass pipe: In order to ensure that the maintenance of the flowmeter does not affect the normal use of the medium, shut-off valves (globe valves) should be installed on the front and rear pipelines of the flowmeter, and a bypass pipe should also be installed. The flow control valve should be installed downstream of the flowmeter. When using the flowmeter, the upstream shut-off valve must be fully opened to avoid unstable flow of fluid in the upstream section.
Requirements for external environment: The flow meter should be installed indoors. If it must be installed outdoors, it must be protected from sunlight and rain Lightning protection measures should be taken to avoid affecting the service life.
Requirement for impurities in the medium: In order to ensure the service life of the flowmeter, a filter should be installed before the straight pipe section of the flowmeter.
Installation location: The flowmeter should be installed in a location that is easy to maintain, free from strong electromagnetic interference and thermal radiation
Requirements for installation welding: The user shall provide another pair of standard flanges to be welded onto the front and rear pipelines. Welding with flow meters is not allowed! Before installing the flowmeter, it is necessary to strictly remove welding slag and other dirt from the pipeline. It is recommended to use pipes of equal diameter (or bypass pipes) instead of the flowmeter for pipeline purging. To ensure that the flow meter is not damaged during use. When installing a flowmeter, the sealing gasket between the flanges should not be recessed into the pipeline.
Requirements for flowmeter grounding: The flowmeter should be reliably grounded and cannot be shared with the grounding wire of the high-voltage system.
Requirements for explosion-proof products: In order to ensure the safe and normal use of the instrument, the usage environment of the explosion-proof flowmeter should be reviewed to ensure compliance with the user's explosion-proof requirements. During installation and use, strict adherence to the national requirements for the use of explosion-proof products is required. Users are not allowed to change the connection method of the explosion-proof system or open the instrument at will. Select within the specified flow range to prevent overspeed operation, ensuring ideal accuracy and normal service life. Before installing the flowmeter, the pipeline should be cleaned of debris such as fragments, welding slag, stones, dust, etc. It is recommended to install a 5-micron sieve filter upstream to block liquid droplets and sand particles. When the flowmeter is put into operation, the front valve should be slowly opened first, and then the rear valve should be opened to prevent instantaneous airflow impact and damage to the turbine. Lubricating oil should be added according to the signs, and the frequency of refueling depends on the cleanliness of the gas, usually 2-3 times a year. Due to pressure testing, pipeline purging, or exhaust causing turbine overspeed operation, as well as turbine operation in reverse flow, the flow meter may be damaged. It is not allowed to open the flowmeter randomly before operation Rear cover, modify internal parameters, otherwise it will affect the normal operation of the flowmeter. Be careful when installing the gasket to ensure that no protrusions enter the pipeline to prevent interference with normal flow measurement. When calibrating a flowmeter, pressure should be collected at the pressure tap of the flowmeter.
use
Turbine FlowmeterWhat aspects should be noted when using:
1. Use of each route
After installation, it should be ensured that all chips and residues have been removed, the system has been purged, pressure tested, and the airflow has entered and increased to the flow rate of the inlet valve
1.2 Open the upstream bypass ball valve of the turbine flowmeter
1.3 Slowly open the bypass small shut-off valve upstream of the KH-LWGY turbine flowmeter, and slowly fill the gas until it reaches the electric forced seal ball valve downstream of the turbine flowmeter.
Attention: Severe pressure fluctuations or excessive high-speed pressurization can damage the turbine flowmeter. To protect the gas turbine flowmeter, the pressure increase added to the turbine flowmeter cannot exceed 35kPa/s. If the pressure change cannot be measured on site, the flow rate of the turbine flowmeter should not exceed the limit.
1.4 Close the bypass ball valve and shut-off valve.
Rotate the handwheel to open the forced sealing valve at the inlet.
Slowly open the electric forced seal ball valve downstream of the turbine flowmeter (at least for 1 minute), and use the manual switch on the electric actuator. Be careful not to overspeed the turbine flowmeter
1.7 Follow steps 1.2-1.6 to complete the system pressurization and start measuring natural gas.
Online comparison of gas turbine flow meters (comparing working and main circuits)
2.1 Ensure that the inlet and outlet valves of the main road are closed.
2.2 According to steps 1.2, 1.3, and 1.4 in "1 Use of Each Road", pressurize the main road.
2.3 Close the electric forced sealing ball valve at the outlet of the working path, slowly open the forced sealing ball valve of the comparison pipeline, and slowly open the electric forced sealing ball valve at the outlet of the main path (preferably doing all three tasks at the same time).
2.4 The gas passes through the working path and the main path in sequence. Two turbine flow meters can be compared with each other to check for significant deviations.
After the comparison is completed, close the two forced sealing ball valves on the comparison pipeline and the main pipeline, and open the outlet ball valve of the working pipeline (preferably doing three tasks at the same time).
At this point, the work path resumes.
3. Use a mobile calibration vehicle to calibrate the gas KH-LWGY turbine flowmeter online
3.1 Ensure that the electric forced seal ball valve between the two calibration ports is in the closed state.
3.2 Open the ball valve on the flange blind plate of the calibration port to ensure that there is no pressure inside the flange blind plate. Then remove the flange blind plate.
3.3 Connect the mobile calibration vehicle to the calibration port.
3.4 Charge the main circuit according to steps 1.2, 1.3, and 1.4 in "1. Use of each circuit".
3.5 Close the electric forced sealing ball valve at the outlet of the working path, slowly open the forced sealing ball valve of the comparison pipeline, and slowly open the two calibrated forced sealing ball valves on the main path (preferably doing all four tasks simultaneously).
At this point, the gas flows through the two gas turbine flow meters inside the sled and the mobile calibration vehicle in sequence. After completing the online calibration, close the two ball valves at the calibration port, slowly open the forced sealing ball valve of the comparison pipeline, and slowly open the electric forced sealing ball valve at the outlet of the working path (preferably doing all four tasks simultaneously).
3.8 Reinstall the flange blind plate and do not forget to close the ball valve on the flange blind plate. 3.9 At this point, the work path resumes.