Ⅰ. Product Features
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%. It is precisely because of its good repeatability that frequent calibration or online calibration can achieve extremely high accuracy, making it a preferred flowmeter in trade settlement;
Output pulse frequency signal, suitable for total measurement and computer connection, no zero drift, strong anti-interference ability;
High frequency signals (3-4kHz) can be obtained, 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 available, which can be designed according to the specific 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.
Ⅱ. Working principle

(1) Working principle
The fluid flows through the sensor housing. Due to the angle between the blades of the impeller and the flow direction, the fluid's impulse force 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 velocity. Due to the magnetic conductivity of the blades, they are in the magnetic field of the signal detector (composed of magnetic steel and coils). 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 an amplifier to form a continuous rectangular pulse wave with a certain amplitude, which can be transmitted to a display instrument remotely to display the instantaneous flow rate or total amount of the fluid. Within a certain flow range, the pulse rate f is proportional to the instantaneous flow rate Q of the fluid flowing through the sensor, and the flow equation is:
Q=f/k*3600
In the formula:
F - Pulse frequency [Hz]
K - The instrument coefficient of the sensor [1/m3] is given by the calibration sheet.
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.

Ⅲ. Instrument classification
1. Classified by instrument function, LWGYStainless steel digital flowmeterIt can be divided into two categories, namely: (1) turbine flow sensor/transmitter (2) intelligent display turbine flow meter:
(1) Turbine flow sensor/transmitter
This type of turbine flowmeter product itself does not have on-site display function, only transmitting and outputting flow signals remotely. Flow signals can be divided into pulse signals or current signals (4-20mA). The instrument is inexpensive, highly integrated, and compact in size, making it particularly suitable for use with secondary display devices, PLCs, DCS, and other computer control systems.
According to different output signals, this type of product can be divided into LWGY - ℉ N type and LWGY - ℉ A type
LWGY - ∈ N type sensor: 24VDC power supply, three wire pulse output, high voltage ≥ 8V, low voltage ≤ 0.8V; signal transmission distance ≤ 1000 meters;
LWGY - Type A transmitter: 24VDC power supply, two-wire 4-20mA output, signal transmission distance ≤ 1000
This type of turbine flow product is divided into two types: basic type and explosion-proof type (ExdIICT6), with the appearance shown in Figure 1 and Figure 2

(2) Intelligent display type turbine flowmeter
A new intelligent instrument integrating turbine flow sensor and display integration developed using advanced ultra-low power single-chip microcomputer technology, with dual row LCD on-site display, has obvious advantages such as compact structure, intuitive and clear reading, high reliability, no external power interference, lightning resistance, and low cost. The instrument has three-point correction of instrument coefficient, intelligent compensation of instrument coefficient nonlinearity, and can be corrected on site. High definition LCD display simultaneously displays instantaneous flow and cumulative flow, with a reset function. Keep all valid data intact for 10 years after power failure. This type of turbine flowmeter is an explosion-proof product,
Explosion proof grade: ExdIICT6
This type of turbine flowmeter can be divided into LWGY - Ⅱ B type and LWGY - Ⅱ C type according to the power supply method and whether it has remote signal output.
LWGY - Ⅱ B type: The power supply adopts 3.6V/10Ah lithium battery (can operate continuously for more than 3 years);
LWGY - ℉ C type: The power supply adopts 24VDC external power supply, outputs 4-20mA standard two-wire current signal, and can add HART communication or RS485 communication function according to different on-site needs.

Ⅳ. Product Classification Description
1. Install according to different methods

2. According to different types of signal detectors

Ⅴ. Selection instructions


Ⅵ. Installation size
1.Stainless steel digital flowmeterThe installation method varies depending on the specifications, using threaded or flange connections. The installation methods are shown in Figure 4, Figure 5, and Figure 6, and the installation dimensions are shown in Table 4