When the fluid flows into the flowmeter, it is rectified and accelerated by the special integrated rectifier at the air inlet. Since the turbine blades and the fluid flow are at a certain angle, the turbine generates a rotational torque. After overcoming the friction torque and the fluid resistance torque, the turbine Start spinning. Within a certain flow range, the angular velocity of the turbine rotation is proportional to the fluid volume flow. According to the principle of electromagnetic induction, the magnetic sensor is used to induce a pulse signal proportional to the fluid volume flow rate from the coaxial rotating signal wheel. The signal is amplified, filtered, and reshaped and enters the intelligent flow totalizer together with the temperature and pressure sensor signals. The micro-processing unit of the instrument performs arithmetic processing, and directly displays the volume flow and total amount of the gas on the LCD screen.
1. High-quality alloy turbine, with higher steady flow and corrosion resistance;
2. Imported high-quality special bearings with long service life;
3. The measuring room is isolated from the ventilation room to ensure the safety of the instrument;
4. It can detect the temperature, pressure and flow of the gas to be measured, can automatically track and compensate the flow, and display the gas volume accumulation under the standard state (Pb=101.325KPa, Tb=293.15K), and the temperature and pressure values can be inquired in real time;
5. Wide flow range (Qmax/Qmin≥20:1), good repeatability, high accuracy (up to 1.0 level), low pressure loss, low starting flow, up to 0.6m3/h;
6. Multi-point non-linear correction of intelligent instrument coefficients;
7. Built-in pressure and temperature sensors, high safety performance, compact structure and beautiful appearance;
8. The instrument has explosion-proof and protection functions, the explosion-proof marks are ExdⅡBT6, ExiaⅡCT6, and the protection level is IP65;
9. The system works with low power consumption, and a 3.2V10AH lithium battery can be used continuously for more than 3 years;
10. The meter coefficient and accumulated flow value will not be lost for ten years after power failure.
Measurement of gas flow in closed pipelines-gas turbine flowmeter (GB/T8940-2003)
And connection method
25、40、50、65、80、100、125、150、200、250、300、using flange connection
25、40、50can be connected by thread
±1.5%R（±1%R needs to be specially made）
Body: 304 stainless steel or cast aluminum
Impeller: anti-corrosion ABS or high-quality aluminum alloy
Converter: cast aluminum
Medium temperature: -20℃～+80℃
Ambient temperature: -30℃～+60℃
Relative humidity: 5%～90%
Atmospheric pressure: 86kpa～106kpa
A. External power supply: 24VDC±15%, ripple ≤±5%, suitable for 4-20mA output, pulse output, RS485
B. Internal power supply: 1 set of 3.0V10AH lithium battery, the battery voltage is normal when the battery voltage is 2.0-3.0V
When the voltage is lower than 2.0, an undervoltage indication appears
A. External power supply:<1W
B. Internal power supply: average power consumption ≤1W, can be used continuously for more than 3 years
Pulse signal, 4-20mA current signal, control signal
Start-stop record, daily record, fixed time interval record
Internal thread M20×1.5 or others
ExdIIBT6 or ExiaIICT4
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