Hydrogen turbine flowmeterWorking principle and type of

Working Principle:
Hydrogen turbine flowmeterThe working principle of the sensor is that 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 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 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; Where:
F - Pulse frequency [Hz];
K - the instrument coefficient of the sensor [1/m3], given by the calibration sheet. If [1/L] is used as the unit
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.
Types of flow meters:
A、 On site display type:
This intelligent flowmeter is a new type of flowmeter display instrument designed using advanced single-chip microcomputer technology, which is matched with flow sensors that output pulse signals (such as turbines and vortices). Can display instantaneous flow rate and cumulative total amount. Accumulated traffic: eight digits, three significant digits after the decimal point. Instantaneous flow rate: a six digit number that can display changes per liter. Display accuracy: ± 1 display unit. Signal output: Pulse output: 1~3000Hz external supply+12~+24VDC power supply current output: 4~20mA external supply+24VDC power supply (two-wire system) with 2 built-in 3V lithium batteries for parallel power supply. When the voltage is below 2.7V, an undervoltage indicator appears, which is explosion-proof. Small signal cutoff function.
B、 Pulse output type:
Working voltage:+12VDC or+24VDC (customers must select one power supply before placing an order). Signal transmission distance: less than 250 meters. Output signal: Square wave signal amplitude:+12VDC Power supply amplitude is approximately 10V+24VDC Power supply amplitude is approximately 20V Installation: The amplifier and turbine flow sensor are connected with M16 × 1.5 threads. After installing the turbine flow sensor, screw the amplifier onto the turbine flow sensor and tighten the locking nut by hand until the amplifier feels fully seated. Wiring: The pulse output amplifier has three external leads, red, white, and shielded. Connect the red line to the positive power supply, connect the white line to the pulse output and other display devices or equipment, shield and ground
C. 4-20mA output type:
Working voltage: external power supply+24VDC (two-wire system) output signal: 4-20mA or 1-5V, 4mA corresponds to zero flow of the turbine flow sensor, 20mA is used for maximum flow of the turbine flow sensor, and the flow range is shown on the turbine flow sensor nameplate. Signal transmission distance: less than 250 meters. Installation: After installing the turbine flow sensor, screw the amplifier onto the connector of the turbine flow sensor (m16 × 1.5 thread), and tighten the locking nut by hand until the amplifier feels fully seated. Wiring: The external leads of the 4-20mA output amplifier are red and white lines. The red line is the power line, and the white line is the signal line.
D、 Split remote transmission display type:
Working voltage: external power supply 220VAC signal transmission distance: less than 250 meters Display instrument instantaneous four digit: cumulative total nine digit Display instrument size: horizontal: 160mm × 80mm Vertical: 80mm × 160mm Display instrument with 4-20mA output and can be connected to a computer.