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;
