1、 Overview
The ARSLWQ basic gas turbine flowmeter is a new generation of high-precision and high reliability gas precision measuring instrument that has been independently developed and optimized by drawing on advanced flow instrument technologies at home and abroad, integrating theories of gas mechanics, fluid mechanics, electromagnetics, etc. It has excellent low-pressure and high-pressure measurement performance, multiple signal output modes, and low sensitivity to fluid disturbances. It is widely used for measuring gases such as natural gas, coal to gas, liquefied gas, and light hydrocarbon gas.
The basic gas turbine flow sensor product itself does not have on-site display function, and only transmits the flow signal in the form of pulse signal for remote output. The instrument is inexpensive, highly integrated, and compact in size, making it particularly suitable for use with computer control systems such as secondary displays, PLCs, and DCS. The basic gas turbine flow sensors are all explosion-proof products, with an explosion-proof rating of ExdIIBT6.
2、 Product Features
High quality alloy turbine with higher flow stability and corrosion resistance
Imported high-quality specialized bearings with long service life
The isolation between the measuring room and the ventilation room ensures the safety of the instruments
Wide flow range (Qmax/Qmin ≥ 20:1), good repeatability, high accuracy (up to 1.0 level), low pressure loss, low starting flow rate, up to 0.6m3/h
The instrument has explosion-proof and protective functions, with explosion-proof markings of Exd Ⅱ BT6 and Exia Ⅱ CT6, and a protection level of IP65
3、 Technical parameters:
1. Basic parameters: Table 1

Instrument caliber and connection method	25, 40, 50, 80, 100, 150, 200, 250 are connected by flanges
	25 and 40 can be connected using threaded connections
accuracy class	± 1.5% R, ± 1% R
Range ratio	1:10； 1:20； 1:30
Instrument material	Table body: 304 stainless steel; Impeller: anti-corrosion ABS or high-quality aluminum alloy; Converter: Cast aluminum
Temperature of the tested medium (℃)	-30℃～+80℃
environmental condition	Medium temperature: -30 ℃~+80 ℃, relative humidity 5%~90%, atmospheric pressure 86~106Kpa
output signal	Three wire pulse frequency signal, low level ≤ 0.8V, high level ≥ 8V
power supply	+12VDC,+24VDC (optional)
Signal transmission line	STVPV3×0.3
Distance	≤1000m
Signal line interface	Internal thread M20 × 1.5
Explosion proof grade	ExdIIBT6
protection grade	IP65

2. Measurement range and working pressure: Table 2 (Note: The measurement range shown in Table 2 is the flow range under working conditions)

Model specifications	Nominal diameter (mm)	Flow range (m3/h)	Initial flow rate (m3/h)	Work pressure (MPa)	Installation form
ARSLWQ-25A	25 （1'）	0.7-7	0.6	4.0	Flange (thread)
ARSLWQ-25B		1.5-15	1.0	4.0
ARRSLWQ-25C		3-30	2.0	4.0
ARSLWQ-40A	40 （1.5'）	4-40	2.5	4.0	Flange (thread)
ARSLWQ-40B		8-80	3	4.0
ARSLWQ-50A	50 （2'）	10-100	3.5	4.0	flange
ARSLWQ-50B		15-150	4	4.0	flange
ARSLWQ-80	80 （3'）	15-300	4	1.6	flange
ARSLWQ-100	100（4'）	20-400	5	1.6	flange
ARSLWQ-150	150（6'）	50-1000	8	1.6	flange
ARSLWQ-200	200（8'）	100-2000	20	1.6	flange
ARSLWQ-200	250（10'）	150-3000	30	1.6	flange
ARSLWQ-300	300（12'）	200-4000	40	1.6	flange

1. Selection instructions

When selecting, users should reasonably choose the model and specifications of the flowmeter based on the nominal pressure of the pipeline, the maximum pressure of the medium, the temperature of the medium, the composition of the medium, the flow range, and the signal output requirements.
To achieve optimal performance of the flowmeter, the flow rate range should be within the Qmax range of (20% to 80%), which is more appropriate.

2. Selection Chart: Table 3

Model					Remarks
ARSLWQ-	□	-□	/□	/□
type	N				Pulse output gas turbine flow sensor
Instrument caliber		25A/B/C			25mm
		40A/B			40 mm
		50A/B			50 mm
		80			80 mm
		100			100 mm
		150			150 mm
		200			200 mm
		250			250 mm
		300			300 mm
Sensor material			N		Basic material, high-quality aluminum alloy. (Maximum pressure resistance: 1.0MPa)
			S		Stainless steel material. (High pressure anti-corrosion type)
special structure				A	Oxygen specific structure (degreasing treatment)
				B	Special structure for compressed air (high flow rate design)

Example: Choose a stainless steel material, pulse output gas turbine flowmeter to measure oxygen, with a user measurement range of 10-35m3/h, model: ARSLWQ-40A/S/A