Gas Turbine Flowmeter for High-Precision Professional Natural Gas Measurement

Instrument Diameter (mm) and Connection Type	DN50, DN80, DN100, DN150, DN200, DN250, DN300 mm; Flange connection; DN25, DN40, DN65, DN125 mm customizable
Accuracy Class	±1.5%R, ±1%R
Turndown Ratio	1:10; 1:20
Instrument Material	Body: cast aluminum or 304 stainless steel; Impeller: high-quality aluminum alloy; Display: cast aluminum
Measured Medium Temperature (°C)	-30°C ~ +80°C
Environmental Conditions	Temperature: -20°C ~ +60°C, relative humidity 5%~90%, atmospheric pressure; Pulse frequency signal output: low level <0.8V, high level >8V; Two-wire, three-wire 4-20mA current output
Power Supply	External power: 24V DC; Internal power: 3.6V lithium battery
Transmission Distance	≤1000m
Signal Line Interface	Internal thread M20×1.5
Explosion-proof Class	EXDIICT6
Protection Class	IP65

Working Principle

When the fluid enters the flowmeter, it is rectified and accelerated by the dedicated integrated rectifier at the inlet. Since the turbine blades are at a certain angle to the flow direction, the turbine generates a rotational torque. After overcoming the friction torque and fluid resistance torque, the turbine begins to rotate. Within a certain flow range, the angular velocity of the turbine is proportional to the volumetric flow rate of the fluid. Based on the principle of electromagnetic induction, a magnetic sensor detects a pulse signal from the coaxially rotating signal wheel. This pulse signal is proportional to the volumetric flow rate. The signal is then amplified, filtered, and shaped, and together with the signals from the temperature and pressure sensors, it is sent to the microprocessing unit of the intelligent flow totalizer for calculation. The volumetric flow rate and the total volume of the gas are directly displayed on the LCD screen.

Flow Range

Nominal Diameter (mm)	Model	Standard Range (m³/h)	Extended Range (m³/h)	Standard Pressure Rating (MPa)	Special High Pressure (MPa)	Installation Type
DN20	LWQ-20	S: 2.2-25	4-40	1.6	2.5, 4.0	Flange
DN25	LWQ-25	S: 2.2-25	4-40	1.6	2.5, 4.0	Flange (Thread)
DN32	LWQ-32	S: 5-50	w: 6-60	1.6	2.5, 4.0	Flange
DN40	LWQ-40	S: 5-50	w: 6-60	1.6	2.5, 4.0	Flange (Thread)
DN50	LWQ-50	S1: 6-65	w1: 5-70	1.6	2.5, 4.0	Flange
DN50	LWQ-50	S2: 10-100	w2: 8-100	1.6	2.5, 4.0	Flange
DN65	LWQ-65	S: 15-200	w: 10-200	1.6	2.5, 4.0	Flange
DN80	LWQ-80	S1: 13-250	w: 10-160	1.6	2.5, 4.0	Flange
DN80	LWQ-80	S2: 20-400	w: 10-160	1.6	2.5	Flange
DN100	LWQ-100	S1: 20-400	w: 13-250	1.6	2.5	Flange
DN100	LWQ-100	S2: 32-650	w: 13-250	1.6	2.5	Flange
DN125	LWQ-125	S: 25-700	w: 20-800	1.6	2.5	Flange
DN150	LWQ-150	S1: 32-650	w: 80-1600	1.6	2.5	Flange
DN150	LWQ-150	S2: 50-1000	w: 50-1000	1.6		Flange
DN200	LWQ-200	S1: 80-1600	w: 50-1000	1.6		Flange
DN200	LWQ-200	S2: 130-2500	w: 80-1600	1.6		Flange
DN250	LWQ-250	S1: 130-2500	w: 80-1600	1.6		Flange
DN250	LWQ-250	S2: 200-4000	w1: 130-2500	1.6		Flange
DN300	LWQ-300	S: 200-4000	w2: 320-6500	1.6		Flange