The threaded connection turbine flowmeter is a new generation turbine flowmeter with the characteristics of simple structure, lightweight, high accuracy, good reproducibility, sensitive response, and easy installation, maintenance, and use. It is widely used for measuring the corrosion resistance of stainless steel 1Cr18Ni9Ti, 2Cr13, corundum Al2O3, and hard alloys in closed pipelines, and has no impurities such as fibers and particles.
Manufacturer of threaded connection liquid turbine flowmeter
Threaded connection turbine flowmeter is the main type of velocity flowmeter. When the measured fluid flows through the turbine flowmeter sensor, the impeller rotates under the action of the fluid, and its speed is proportional to the average flow velocity of the pipeline. At the same time, the blades periodically cut the magnetic field lines generated by the electromagnet, changing the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating electric potential signal, namely an electric pulse signal, is induced in the coil. The frequency of this electric pulse signal is proportional to the flow rate of the measured fluid.
Working principle of threaded connection turbine flowmeter
The fluid flows through the sensor housing. Due to the angle between the blades of the impeller and the flow direction, the impulse of the fluid causes the blades to have a rotational torque. After overcoming the friction torque and fluid resistance, the blades rotate. After the torque is balanced, the speed is stable. Under certain conditions, the speed is proportional to the flow rate. Due to the magnetic conductivity of the blades, they are in the magnetic field of the signal detector (composed of permanent magnet and coil). The rotating blades cut the magnetic field lines and periodically change the magnetic flux of the coil, causing electrical pulse signals to be induced at both ends of the coil. This signal is amplified and shaped by the amplifier, forming a continuous rectangular pulse wave with a certain amplitude, which can be transmitted far to the display instrument to display the instantaneous flow rate and cumulative amount of the fluid. Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow rate Q of the fluid flowing through the sensor, and the flow equation is:
Q=3600×f/k
In the formula:
F – pulse frequency [Hz];
The instrument coefficient of the K sensor [1/m] is given by the calibration sheet. If using [1/L] as the unit, Q=3.6 × f/k;
Q – instantaneous flow rate of fluid (in working condition) [m3/h];
3600- Conversion factor;
The instrument coefficient of each sensor is filled in the calibration certificate by the manufacturer, and the k value is set in the matching display instrument to display the instantaneous flow rate and cumulative total amount.
Advantages of threaded connection turbine flowmeter
- High precision, generally up to ± 1% R, ± 0.5% R, and high-precision models up to ± 0.2% R;
- Good repeatability, such as frequent calibration or online calibration, can achieve extremely high accuracy, making it a preferred flowmeter for trade settlement;
- Capable of three-point correction of instrument coefficients, intelligent compensation of instrument coefficient nonlinearity, and on-site correction;
- Keep all valid data intact for 10 years after power failure;
- 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.
Technical parameters
| enforce standards | Turbine flow sensor（JB/T9246-1999） |
| Connection mode | Thread, clamp, flange, clamp type |
| accuracy level | ±1%R、±0.5%R、±0.2%R（Need to customize） |
| Sensor material | 304、316 Stainless steel |
| Conditions of use | Medium temperature: -20℃ ~ +120℃ Ambient temperature: -20℃ ~ +60℃ |
| Relative humidity: 5%-90% Atmospheric pressure: 86Kpa ~ 106Kpa | |
| Signal output function | Pulse signal, 4-20mA signal |
| Communication output function | RS485 communication, HART protocol, etc |
| Working power supply | External power supply: 24VDC±15%, ripple ≤±5%, suitable for 4-20mA output, pulse output, RS485, etc |
| Internal power supply: 1 set of 3.6V10AH lithium battery, the battery voltage can work normally at 2.0-3.0V | |
| Signal line interface | Basic model: Hausmann connector or three-core cable; Explosion-proof type, internal thread M20*1.5 |
| Explosion-proof class | Exia II CT or Exd II BT6 |
| Class of protection | IP65 or higher customizable |
Application fields of threaded connection turbine flowmeter
The flange type liquid turbine flowmeter is widely used in the measurement and control systems of petroleum, chemical, metallurgical, scientific research and other fields. Liquid turbine flow meters equipped with sanitary fittings can be applied in the pharmaceutical industry.