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1、 Overview
The ARSLWQ-B (C) on-site display 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 measuring 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.
This series of flow meters adopts advanced ultra-low power single-chip microcomputer technology to develop a new intelligent instrument that integrates turbine flow sensors and display integration. It adopts dual row LCD on-site display, which has obvious advantages such as compact structure, intuitive and clear readings, high reliability, no external power interference, lightning resistance, and low cost. The instrument has six point correction for instrument coefficient, intelligent compensation for instrument coefficient nonlinearity, and can be corrected on site. The high-definition LCD display simultaneously displays instantaneous flow rate (4 significant digits) and cumulative flow rate (8 significant digits, with reset function). Keep all valid data intact for 10 years after power failure. This type of turbine flowmeter is an explosion-proof product with an explosion-proof rating of ExdIIBT6.
This type of turbine flowmeter can be divided into ARSLWQ - □ B type and ARSLWQ - □ C type according to the power supply method and whether it has remote signal output.
ARSLWQ - □ B type: The power supply uses a 3.2V10AH lithium battery (which can operate continuously for more than 3 years); No signal output function.
ARSLWQ - □ C type: The power supply adopts 24VDC external power supply, outputs 4-20mA standard two-wire current signal, and can add RS485 or HART communication according to different on-site needs.
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
Intelligent instrument coefficient multi-point nonlinear correction
The system operates with low power consumption, and a 3.2V10AH lithium battery can be used continuously for more than 3 years
Instrument coefficient and cumulative flow value will not be lost for ten years after power failure
3、 Technical parameters:
1Basic parameters: Table 1
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Instrument caliber and connection method
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25, 40, 50, 80, 100, 150, 200, 250 are connected by flanges
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25 and 40 can be connected using threaded connections
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accuracy class
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± 1.5% R, ± 1% R
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Range ratio
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1:10； 1:20； 1:30
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Display mode
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Dual row LCD displays both instantaneous flow and cumulative flow simultaneously
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Instrument material
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Table body: 304 stainless steel; Impeller: anti-corrosion ABS or high-quality aluminum alloy; Monitor: Cast aluminum
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Temperature of the tested medium (℃)
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-30℃～+80℃
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environmental condition
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Medium temperature: -30 ℃~+80 ℃, relative humidity 5%~90%, atmospheric pressure 86~106Kpa
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output signal
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Standard two-wire 4-20mA (ARSLWQ-C type)
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power supply
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LWQ-B type: The instrument is equipped with a built-in lithium battery, which can work continuously for more than 3 years. ARSLWQ-C type: 24VDC external power supply
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Signal transmission line
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2×0.3
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Distance
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≤1000m
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Signal line interface
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Internal thread M20 × 1.5
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Explosion proof grade
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ExdIIBT6
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protection grade
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IP65
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2. Measurement range and working pressure: Table 2 (Note: The measurement range shown in Table 2 is the flow range under working conditions)
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Model specifications
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Nominal diameter (mm)
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Flow range (m3/h)
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Initial flow rate (m3/h)
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Work pressure (MPa)
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Installation form
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ARSLWQ-25A
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25 （1'）
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0.7-7
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0.6
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4.0
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Flange (thread)
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ARSLWQ-25B
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1.5-15
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1.0
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4.0
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ARSLWQ-25C
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3-30
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2.0
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4.0
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ARSLWQ-40A
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40 （1.5'）
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4-40
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2.5
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4.0
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Flange (thread)
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ARSLWQ-40B
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8-80
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3
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4.0
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ARSLWQ-50A
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50 （2'）
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10-100
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3.5
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4.0
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flange
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ARSLWQ-50B
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15-150
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4
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4.0
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flange
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ARSLWQ-80
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80 （3'）
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15-300
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4
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1.6
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flange
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ARSLWQ-100
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100（4'）
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20-400
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5
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1.6
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flange
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ARSLWQ-150
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150（6'）
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50-1000
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8
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1.6
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flange
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ARSLWQ-200
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200（8'）
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100-2000
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20
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1.6
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flange
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ARSLWQ-200
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250（10'）
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150-3000
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30
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1.6
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flange
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ARSLWQ-300
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300（12'）
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200-4000
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40
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1.6
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flange
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4、 Instrument selection
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
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Model
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Remarks
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ARSLWQ—
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□
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—□
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/□
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/□
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type
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B
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Intelligent integrated gas turbine flowmeter
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C
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Intelligent integrated remote transmission gas turbine flowmeter
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Instrument caliber
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25A/B/C
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25mm
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40A/B
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40 mm
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50A/B
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50 mm
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80
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80 mm
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100
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100 mm
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150
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150 mm
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200
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200 mm
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250
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250 mm
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300
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300 mm
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Sensor material
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N
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Basic material, high-quality aluminum alloy. (Maximum pressure resistance: 1.0MPa)
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S
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Stainless steel material. (High pressure anti-corrosion type)
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special structure
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A
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Oxygen specific structure (degreasing treatment)
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B
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Special structure for compressed air (high flow rate design)
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Example: Choose a stainless steel gas turbine flowmeter that displays and outputs a 4-20mA signal on site to measure oxygen. The user's measurement range is 10-35m3/h, and the model is ARSLWQ-C-40A/S/A
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