NYLD-GZ Type Gas Turbine FLOWMETER Safety - Explosion-Proof High Precision
NYLD-GZ Type Gas Turbine Eletromagnetic Flowmeter
The NYLD-GZ type gas turbine flowmeter integrates gas turbine flow sensor and electronic volume corrector. It can detect and display the working condition flow and total volume. The technical performance is at the domestic advanced level,complies with GB/T18940/IS09951 standard, which is widely used in gas metering and testing in industries such as steam and compressed air.
NYLD-GZ Type Gas Turbine Eletromagnetic Flowmeter Modeling
| NYLD-GZ | Intelligent gas turbine flow meter (standard condition volume type, with temperature, pressure compensation) |
| Intelligent gas turbine transmitter (working condition volume type) |
| Caliber | 25 40 50 65 80 100 125 150 200 250 300 | DN 25mm(non-standard, long order period) DN 40mm(non-standard, long order period) DN 50mm DN 65mm(non-standard, long order period) DN 80mm DN 100mm DN 125mm(non-standard, long order period) DN 150mm DN 200mm DN 250mm(non-standard, long order period) DN 300mm |
| Range | A B C | Standard range Expansion range Expansion range |
| Accuracy grade | 01 02 | 1.5 grade 1.0 grade |
| Output model | A B C | Pulse output, IC card pulse output, alarm output 4-20mA current, pulse output, IC card output, alarm output 4-20mA current, pulse output, IC card output, alarm output, RS485 communication |
| Explosion-proof grade | N E | Standard type, non explosion-proof Explosion-proof type, ExdⅡCT6 |
NYLD-GZ Type Gas Turbine Eletromagnetic Flowmeter Operating Principle
When the fluid passes through the flowmeter, it is rectified and accelerated by the action of the guide vane (or rectifier). Since the impeller is at an angle to the fluid flow direction, at this time,the turbine generates a rotational moment. After overcoming the friction torque and the fluid resistance torque, the turbine starts to rotate. In a certain flow range, the angular velocity of the turbine rotation is proportional to the volume flow rate of the fluid. According to the principle of electromagnetic induction, a magnetic sensitive sensor is used to induce a pulse signal proportional to the volume flow of the fluid from the synchronously rotating communicating plate. This signal is sent to the volume corrector and is processed together with signals such as temperature and pressure, and displayed on the LCD screen. Its structure principle is shown in Figure 1..
4.2Volume Corrector Working Principle
The volume corrector consists of temperature, pressure detection analog channel, flow detection digital channel, micro processing unit, liquid crystal drive circuit and other auxiliary circuits, and it is equipped with an external signal interface.After converting and processing the multi-channel signals sent from each sensor, the signals is brought into the formula for operation according to the gas equation to realize the local display and remote transmission of various signals.
The gas equation can be written as
Where:
Vo — the volume unde3r the standard condition (m3);
V — the volume under the3 working condition (m3);
P=Pa+Pg — the absolute pressure (kPa) at the flowmeter pressure detection point;
Pa — local atmospheric pressure (kPa);
Pg—the meter pressure (kPa) of the flowmeter pressure detection point;
P0 — the standard atmospheric pressure (101.325kPa)
T0 — the absolute temperature under the standard condition (293.15K, which can be 273.15K according to user requirements);
T — the absolute temperature of the measured medium (27315+t)K;
t — the temperature of the measured medium (°C);
Fz—Gas compression coefficient
Zn — the gas compression coefficient under standard sate
Zg — the gas compression coefficient under working condition;
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