Features
■Using microelectromechanical system chip processing technology and mass integrated circuit production technology and material growth technology, the size of the sensor has been reduced to micron level, which greatly improves the sensitivity of the flowmeter.
■ Multi - sensor integration is realized on a single chip, which greatly improves the measuring range ratio ( range degree ) of the flowmeter.
■ The zero point stability of the sensor is greatly improved compared with the traditional thermal mass flowmeter.
■ Combined with the microcomputer intelligent technology of the secondary instrument, the flowmeter has good repeatability, and the measurement is accurate and reliable.
■The simplified structure brought by technological progress makes the flow meter greatly reduce the pressure loss compared with the traditional mechanical instrument, and greatly reduces the energy consumption.
■ Micro power consumption design.Use LCD to display instantaneous flow rate and accumulated flow rate, clear and intuitive, easy to read.
■The product integrates electromagnetic compatibility design technology and has higher anti-interference ability.
■The flow meter is equipped with RS485 communication module, which can be centrally managed with the host computer network.
Product technical index and selection
1.Product technical index Table 1
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Model
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LKM2120
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LKM2190
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LKM3030
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LKM3060
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LKM3080
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LKM3120
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LKM3190
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Diameter DN
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12mm
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19mm
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3mm
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6mm
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8mm
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12mm
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19mm
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Flow range
:L/Min
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0.3-300
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0.8-800
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0.15-50
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0.5-50
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1.2-120
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3-300
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8-800
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Range ratio
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100:1
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Precision
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±(1.5+0.5FS)%
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Repeatability
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±0.75
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Maximum working pressure
MPa
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1.0
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1.5
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Working temperature
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-10~55℃
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Humidity
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<95%RH(No ice, no dew）
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Working power supply
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8-24Vdc,35mA
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8-24Vdc,35mA
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Output
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4-20mA;RS485;pulse
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Mechanical interface
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NPT,BSPT（Can be customized according to user needs）
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Repeatability precision
(%F·s)
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±0.2%F.S
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Input and output signal voltage
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0 ~ +5.00V
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Power supply
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+15V±5%50mA,-15V±5%200mA
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Working pressure range
(MPa)
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0.05 ~ 0.3
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Accuracy
(%F·s)
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±1%F.S(20,30SLM ±2%F.S)
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Repeatability precision
(%F·s)
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±0.2%F.S
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Flow range
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0~5,10,20,30,50,100,200,300,500SCCM
0~1,2,3,5,10,20,30 50 100 500 1000SLM
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2、Instrument selection
Table 2
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Model code
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Thermal gas mass Flowmeter
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LKM2
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-¨
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¨
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¨
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¨
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¨
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¨
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¨
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Code description
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LKM3
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-¨
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¨
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¨
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¨
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¨
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¨
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¨
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Diameter
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03
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DN3mm
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06
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DN6mm
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08
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DN8mm
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12
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DN12mm
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19
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DN19mm
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Connection method
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0
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Standard
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1
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N-NPT(Can be customized according to user needs)
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Output signal
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C1
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4-20mA
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C2
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Pulse
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C3
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RS485
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Whether the watch head is displayed with or not
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D1
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No display at the head
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D2
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Head instantaneous flow display
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Explosion-proof grade
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E1
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Non-explosion-proof type
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E2
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Explosion-proof type
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Measuring gas medium
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F1
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Air
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F2
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Oxygen
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F3
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Nitrogen
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F4
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Argon
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F5
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Carbon dioxide
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F6
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Sky oxygen
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Product structure size and installation
1.Structure size
LKM shape and installation dimensions are shown in the figure：
Table 3
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Model specification
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Diamete
d(mm)
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Interface
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L(mm)
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H(mm)
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W(mm)
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C(mm)
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LKM3030
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3
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1/8”
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96
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125
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35
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36
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LKM3060
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6
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1/4”
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104
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127
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35
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36
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LKM3080
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8
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3/8”
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106
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134
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35
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50
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LKM3120/LKM2120
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12
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1/2”
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142
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137
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40
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50
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LKM3190/LKM2190
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19
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3/4”
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182.5
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150
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40
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70
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2、Product installation
This product is recommended for horizontal installation.The arrow on the base indicates the direction of medium flow.The media inlet and outlet port connection must be correct, and the inlet side shall be equipped with a high efficiency filter.
Installation steps:
(1)After taking out the flowmeter, check its appearance to make sure there is no loss；
(2)Connect and clean pipes；
(3)Install the flowmeter on the pipe and note the following；
①In order to ensure the measurement accuracy of the Flowmeter, the upstream end of the Flowmeter should be connected first, the upstream straight section should meet the minimum requirement of 10DN, and the downstream straight section should meet the minimum requirement of 5DN；
②When the flowmeter is installed, it shall not contain any sealing material；
(4)Connect the power cable, pay attention to the polarity of the connection, and make sure the input dc voltage is at (5~12) VDC；
(5)If it is necessary to connect the signal line, make sure that the signal line is correctly connected to the corresponding user interface；
(6)Turn on the power and the LCD display is correct；
(7)Open the upstream and downstream valve of the pipeline and the flowmeter begins to measure the gas flow in the pipeline.
