The liquid turbine flowmeter is a precision flow measuring instrument, which can be used to measure the flow and total amount of liquid when matched with the corresponding flow totalizer.
Liquid turbine flowmeters are widely used in metering and control systems in the fields of petroleum, chemical industry, metallurgy, scientific research, etc. Liquid turbine flow meters
equipped with sanitary joints can be used in the pharmaceutical industry.

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The structure of the integrated liquid turbine flowmeter is explosion-proof design, which can display the total flow rate, the instantaneous flow rate and the percentage of full flow rate.
The battery adopts long-term lithium battery. The battery life of single-function integrator can reach more than 5 years, and the battery life of multi-function indicator can reach more than 12 months.

The integrated meter head can display many flow units, including cubic meters, gallons, liters, standard cubic meters, standard liters, etc., fixed pressure and temperature parameters can be set to
compensate for the gas, and the pressure and temperature parameters do not change much. , The instrument can be used for fixed compensation accumulation

 

Principle of action

 

The liquid turbine flowmeter uses a turbine for measurement. It first converts the flow rate into the rotational speed of the turbine, and then converts the rotational speed into
an electrical signal proportional to the flow rate. This kind of flowmeter is used to detect instantaneous flow and total integrated flow, and its output signal is frequency,
which is easy to digitize. In Figure 1, the induction coil and the permanent magnet are fixed on the housing together. When the ferromagnetic turbine blade passes the magnet,
the reluctance of the magnetic circuit changes, thereby generating an induction signal. The signal is amplified and shaped by the amplifier, and sent to the counter or frequency
meter to display the total accumulated flow. At the same time, the pulse frequency undergoes frequency-voltage conversion to indicate instantaneous flow. The speed of the
impeller is proportional to the flow, and the number of revolutions of the impeller is proportional to the total amount of flow. The output of the turbine flowmeter is a frequency
modulated signal, which not only improves the anti-interference of the detection circuit, but also simplifies the flow detection system. Its turndown ratio can reach 10:1, and
the accuracy is within ±0.2%. The time constant of the turbine flowmeter with small inertia and small size can reach 0.01 second.

Liquid turbine flow meters are widely used in petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas and cryogenic fluids.

 

 

The output signal of the turbine flowmeter is pulse, which is easy to digitize. The pressure loss of the turbine flowmeter is small, the blade can be anticorrosive, and it can
measure viscous and corrosive media.

Create a pulse signal that is inversely proportional to the flow rate. When the fluid flows through the pipeline, the torsional angular velocity of the turbine meter is inversely
proportional to the fluid flow rate. A turbine is placed in the center of the pipeline, which will cause the sensor coil Flux changes. The sensing coil sends the detected magnetic
flux cycle change signal to the preamplifier, and at the same time sends the pulse signal to the frequency-current conversion circuit to amplify and reshape the signal, so that
the turbine displacement meter suppresses the friction torque and The fluid resistance torque is tampered with. Generate a driving energy moment on the turbo meter,

For the blades of liquid turbine flowmeters, when the blades of the turbine flowmeter cut the magnetic field lines that are ignited by the permanent magnet in the casing, the
fluid flow rate can be lost through the altered angular velocity of the turbine flowmeter, and the pulse signal is converted into an analog current amount. The viscosity of the fluid
medium and the rotation speed of the turbine displacement meter are detected by the sensor coil installed outside the casing. Both ends are supported by bearings. Therefore,
it is important to argue about the loss of fluid flow through the pipeline. In the uncertain flow area, the instant flow value is then indicated. It is sent to the unit conversion and flow
totalizing circuit to obtain and reveal the performance accumulation flow value.

 

Classification

 

Smart Liquid Turbine Flowmeter

A turbine is placed in the center of the pipe, supported by bearings at both ends. When the fluid passes through the pipeline, it impacts the blades of the turbine flowmeter,
generating a driving torque to the turbine flowmeter, so that the turbine flowmeter overcomes the friction torque and the fluid resistance torque to generate rotation. Within a
certain flow range, for a certain fluid medium viscosity, the rotational angular velocity of the turbine flowmeter is proportional to the fluid flow rate. Thus, the fluid flow rate can
be obtained from the rotational angular velocity of the turbine flowmeter, so that the fluid flow rate through the pipeline can be calculated.

 

 

The rotation speed of the turbine flowmeter is detected by a sensor coil installed outside the casing. When the turbine flowmeter blades cut the magnetic field lines generated by
the permanent magnet in the casing, it will cause the magnetic flux in the sensing coil to change. The sensing coil sends the detected magnetic flux periodic change signal to the
preamplifier, amplifies and reshapes the signal, generates a pulse signal proportional to the flow rate, and sends it to the unit conversion and flow integration circuit to obtain and
display the cumulative flow value; At the same time, the pulse signal is sent to the frequency current conversion circuit, which converts the pulse signal into an analog current quantity,
and then indicates the instantaneous flow value.

 

 

Instrument type

 

 

A. On-site display type

This intelligent flowmeter is a new type of flowmeter display instrument designed with advanced single-chip microcomputer technology, and is matched with flow sensors
(such as turbines and vortexes) that output pulse signals. Can display instantaneous flow and cumulative total. Cumulative flow: 8 digits, 3 significant digits after the decimal point.
Instantaneous flow: six digits, which can show the change per liter. Display accuracy: ±1 display unit. Signal output: pulse output: 1~3000Hz external +12~+24VDC power supply
Current output: 4~20mA external +24VDC power supply (two-wire system) built-in 2 3V lithium batteries in parallel for power supply. When the voltage is lower than 2.7V,
there will be an undervoltage indication, explosion-proof type. Small signal removal function.

 

B. Pulse output type
 

Working voltage: +12VDC or +24VDC (the customer must select a power supply before ordering). Signal transmission distance: less than 250 meters. Output signal: square wave
signal amplitude: +12VDC power supply amplitude is about 10V+24VDC power supply amplitude is about 20V Installation: the amplifier and the turbine flow sensor are connected with
M16×1.5 threads, after the turbine flow sensor is installed, screw the amplifier to On the turbine flow sensor, tighten the lock nut by hand until the amplifier feels to the end.
Wiring: The pulse output amplifier has three external leads, the red wire, the white wire and the shield. The red wire is connected to the positive power supply, and the white wire is the
pulse output to connect to other displays or equipment, and the shield is grounded.

 

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 turbine flow sensor, 20mA is the maximum flow of
turbine flow sensor, and the flow range is shown on the nameplate of turbine flow sensor. Signal transmission distance: less than 250 meters. Installation: After the turbine flow sensor is installed,
screw the amplifier to the turbine flow sensor connector (m16×1.5 thread), tighten the lock nut by hand until you feel the amplifier is in the bottom. Wiring: The external leads of the 4-20mA
output amplifier are red and white wires. The red wire is the power wire, and the white wire is the signal wire.

 

D. Split remote display type

Working voltage: 220VAC with external power supply. Signal transmission distance: less than 250 meters. Instantaneous four digits: cumulative total nine digits. Display size: horizontal
type: 160mm×80mm vertical type: 80mm×160mm display instrument with 4~20mA output and parallel Can connect with computer

 

 

use

Intelligent liquid turbine flowmeter (turbine flow sensor and display instrument form a turbine flowmeter). The sensor has the characteristics of high accuracy, good repeatability,
long life and simple operation. It can be widely used in petroleum, chemical, metallurgy, papermaking and other industries to measure the instantaneous volumetric flow and total volume of liquids.


sales01@cxflowmeter.com