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1、 Overview
The ARSLWQ-D temperature and pressure compensation gas turbine flowmeter is a new generation of high-precision and highly reliable gas precision measuring instrument that integrates temperature, pressure, flow sensors, and intelligent flow integrators. It has absorbed advanced flow instrument technologies from both domestic and foreign sources, optimized and designed, and integrated 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 product has been inspected and approved by the national explosion-proof product quality inspection department in accordance with the standards of GB3836.2000 "Electrical Equipment for Explosive Gas Environments Part 1: General Requirements", GB3836.2-2000 "Electrical Equipment for Explosive Gas Environments Part 2: Explosion proof Type" d "", and GB3836.4-2000 "Electrical Equipment for Explosive Gas Environments Part 4: Intrinsic Safety Type" i ". The explosion-proof marks are Exd Ⅱ BT6 (Explosion proof Type) and Exia Ⅱ CT6 (Honan Type). Applicable to Zone 1 and Zone 2 hazardous areas containing explosive gas mixtures of Class IIA, IIB, and IIC temperature groups T1 to T6 (only intrinsic safety type).
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. Through a microprocessor unit, the signals collected by the temperature and pressure detection simulation channel and flow sensor channel are compensated for temperature and pressure according to the gas path, and the compression factor is automatically corrected. All data (instantaneous flow rate, daily cumulative flow rate, total cumulative flow rate, temperature, pressure, time, date, battery power) is intuitively displayed on the LCD display, and various communication signals such as working conditions, standard condition pulse signals, 4-20mA, RS485, IC card signals, etc. can be output.
The instrument adopts a dual power supply mode of built-in lithium battery and external 24VDC. When the user does not need any signal output function, there is no need to provide external 24VDC power to the instrument. The instrument automatically switches to the built-in lithium battery power supply, and the battery can work continuously for more than 3 years.
This type of turbine flowmeter is an explosion-proof product 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
◆ It can detect the temperature, pressure, and flow rate of the tested gas, automatically track and compensate for the flow rate, and display the accumulated gas volume under standard conditions (Pb=101.325KPa, Tb=293.15K); Real time query of temperature and pressure values
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
Intelligent instrument coefficient multi-point nonlinear correction
◆ Built in pressure and temperature sensors, high safety performance, compact structure, and beautiful appearance
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
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:
1. Basic 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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The widescreen display simultaneously displays instantaneous flow, daily cumulative flow, total cumulative flow, temperature, pressure, time, date, and battery level
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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 and pressure sensors
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built-in
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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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communication signal
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Three wire working condition pulse, three wire standard condition pulse, three wire 4-20mA, RS485 protocol, IC card signal
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power supply
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Built in lithium battery, external 24VDC dual power supply
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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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LWQ-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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LWQ-25B
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1.5-15
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1.0
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4.0
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LWQ-25C
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3-30
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2.0
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4.0
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LWQ-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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LWQ-40B
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8-80
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3
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4.0
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LWQ-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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LWQ-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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LWQ-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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LWQ-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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LWQ-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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LWQ-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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LWQ-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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LWQ-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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D
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Intelligent temperature and pressure compensation 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: Using a stainless steel gas turbine flowmeter to measure natural gas, it is required to directly display the volumetric flow rate under standard conditions. The user's measurement range is 10-35m3/h, and the model is ARSLWQ-D-40A/S
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