General Introduction about Gas Turbine Flow Meters

1．Application

The gas turbine flowmeter integrates the gas turbine flow sensor and the gas flow totalizer in one body. The main technical performances of Silver Automation Instruments have reached the international level. The gas turbine flowmeter is used in petroleum, chemical, electric power, metallurgical industry, boiler, gas metering, gas pressure regulating station and gas meter for custody transfer
2.Working principle

When the air flow enters the flowmeter, it first passes through a specially structured straightener and accelerates. Under the action of the fluid, the turbine blade is at an angle to the fluid flow direction. At this time, the turbine generates a rotational moment, and the turbine starts to rotate after overcoming the resistance torque and the friction torque. When the moments reach the equilibrium elbow, the rotational speed is stable, and the rotational angular velocity of the turbine is linear with the flow rate. The magnet on the rotating transmitting disk periodically changes the reluctance of the eccentric, thereby inducing a flow volume flow with the fluid at both ends of the sensor. The pulse signal, which is amplified, filtered, shaped and then is sent to the converter for processing, the totalizer directly showing the volume flow and volume of the fluid.
3. Gas Turbine Flow Meter Construction





4.Flow meter Types

Thread Connection Gas Turbine Flow meter



Flange Connection Gas turbine Flow meter


5. Technical Specifications
5.1 Max Pressure loss at Normal Flow Range

Size (mm)	Normal Flow Range (m3/h)		Max Pressure Loss (Kpa)
20	S	2月20日	1.5
25	S	4-40	1.5
40	S	6-65	1.5
50	S1	7-70	1.2
	S2	10-100	1.4
80	S1	13-250	1
	S2	20-400	2
100	S1	20-400	1
	S2	32-650	1.5
150	S1	50-1000	1
	S2	80-1600	2
200	S1	80-1600	0.8
	S2	130-2500	1.5
250	S1	130-2500	0.8
	S2	200-4000	2
300	S	200-4000	1
350	S	400-8000	1.5
400	S	650-13000	2
Accuracy	1.5%（1.0%is available upon request）

Note: Max Pressure loss is the pressure loss of the air flow meter when working at the max flow point, medium is air at normal temperature.

5.2General Specifications

Medium	Clean gas at a low or middle flow rate
Standard	Measurement of gas flow in closed pipes-Turbine flowmeter (GB/T1 8940-2003)
Size& Process Connection	Flange	Stainless steel body	DN20-DN300
		Carbon steel body	DN350,DN400
	Thread	Stainless steel body	DN20,DN25,DN40,DN50
Flange Standard	Standard	GB/T9113-2000
	Option	ANSI, JIS ,DIN
Thread	Standard	BSPP(male)
	Option	BSPP(F),NPT.,etc

5.3 Pressure Rating of Gas Turbine Sensor

Connection	Material	Size	Normal Pressure Rating	Option
Flange	Stainless steel	DN20-DN100	1.6Mpa	≤6.3Mpa
		DN150-DN200		≤4.0Mpa
		DN250-DN300		≤2.5Mpa
	Carbon steel	DN250-DN400		-
Thread	Stainless steel	DN20-DN50		≤4.0Mpa

5.4 Gas turbine meter Material

Type	Body		Rotor
Thread	304 Stainless steel		Aluminum alloy
	(DN20-DN50)
Flange	304 Stainless steel	Carbon Steel
	(DN20-DN300)	(DN350,DN400)

Note:

Straightener Material: DN20-DN150 ,ABS, DN200 Cast aluminum alloy

Gas meter Transmitter Housing: Cast Aluminum Alloy
5.5 Electrical Specifications

Power Supply	DC24V	3.6Vlithium battery
Consumption	< 2W	< 700μA
Protection level	IP65
Explosion Proof	Exd IICT6 Gb
Electrical Port	M20*1.5 (F)

5.6. Operation Environment of Gas Turbine Flow Transmitter

Calibration Condition	Calibration Equipment	1.Master Meter calibration facility
		2.Sonic nozzle gas flow calibration facility
		3.Bell prover gas calibration facility
	Environment	Temperature: 20℃
		Relative Humidity: 75%
Operation	Medium temperature: -20 ~80℃
	Atmospheric pressure: 86Kpa-106Kpa
	Environment temperature:-20 ~60℃
	Relative Humidity5%-90%