Meter classification
1.According to the meter function, LWGY series turbine flowmeter can be divided into 2 categories, namely:
(1) turbine flow sensor / transmitter (2) intelligent display turbine flowmeter
2.Functional specifications
●Turbine flow sensor / transmitter
This type of turbine flow product itself does not have function of on-site display, only transmitte the flow signal far. The flow signal can be divided into pulse signal or current signal (4-20mA). The meter price is low, with high integration, and small volume,which is especially suitable for use with computer control systems such as secondary display, PLC and DCS.
According to different output signals, these products can be divided into LWGY-□ N-type and LWGY-□ A-type.
LWGY- N-type sensor: 24VDC power supply, three-wire pulse output, high level ≥8V, low level ≤0.8V; signal transmission distance is ≤1000 meters;
LWGY-□A type transmitter: 24VDC power supply, 2-wire 4-20mA output, signal transmission distance ≤1000
This type of turbine flow products are divided into basic type and explosion-proof type (Exdiict 6), and the shape is as shown in (Fig.1) (Fig.2).
●Intelligent integrated turbine flowmeter
The double-row liquid crystal on-site displayc is used for the new intelligent meter integrating turbine flow sensor and display calculation using advanced ultra-low-power single-chip microcomputer technology adopts, which has the advantages of compact mechanism, intuitive and clear reading, high reliability, no external power interference, lightning strike resistance and low cost.The meter has three-point correction of the meter factor, intelligently compensates the nonlinear meter factor, and can be corrected on site. The high-definition liquid crystal display simultaneously displays instantaneous flow and cumulative flow, with clear function. All valid data is not lost after 10 years of power failure. This type of turbine flowmeter is explosion-proof， explosion-proof grade is: EXDIICT 6.
This type of turbine flowmeter can be divided into LWGY-□B type and LWGY-□C type according to the power supply mode and whether it has remote signal output.
LWGY-□B type: 3.0V/10AH lithium battery is uesd for the power supply (can run continuously for more than 4 years);no signal output function.
LWGY-□C type: 24VDC external power supply is used for the power supply, and outputs 4-20mA standard two-wire current signal, and HART communication or RS485 communication function can be increased according to different site needs.
Selection Instructions Table 1
|
Model
|
Description
|
|
LWGY—
|
□
|
/□
|
/□
|
/□
|
/□
|
/□
|
/□
|
|
Nominal diameter
|
4
|
|
|
|
|
|
|
4mm
|
|
6
|
6mm
|
|
10
|
10mm
|
|
15
|
15mm
|
|
20
|
20mm
|
|
25
|
25mm
|
|
32
|
32mm
|
|
40
|
40mm
|
|
50
|
50mm
|
|
65
|
65mm
|
|
80
|
80mm
|
|
100
|
100mm
|
|
125
|
125mm
|
|
150
|
150mm
|
|
200
|
200mm
|
|
Type
|
N
|
Sensor type: +12V or +24V power supply, output three-wire pulse signal
|
|
A
|
Transmitter type: +24V power supply, output 2-wire system 4~20mA
|
|
B
|
Intelligent type: lithium battery power supply, field display no signal output
|
|
C
|
Intelligent type: +24V power supply, field display and output 2-wire system 4~20mA
|
|
C1
|
Intelligent type: +24V power supply, field display and RS485 communication protocol
|
|
C2
|
Intelligent type: +24V power supply, field display and HART communication protocol
|
|
Accuracy grade
|
05
|
0.5 grade
|
|
10
|
1.0 grade
|
|
02
|
0.2 grade (need to negotiate orders, production cycle is longer)
|
|
Turbine type
|
W
|
Extended measurement range
|
|
S
|
Standard measurement range
|
|
Material
|
S
|
304 stainless steel
|
|
L
|
316 (L) stainless steel
|
|
Explosion proof
|
N
|
Non-explosion proof type
|
|
E
|
Explosion-proof tyoe，EXDIICT 6
|
|
Pressure grade
|
N
|
Normal (refer to Table 2)
|
|
H(X)
|
High pressure (refer to Table 2)
|
Note: DN15~DN40 is normally threaded, if you want to use flange connection, please add "(FL)" after "nominal diameter".
For example, a flange connection type explosion-proof turbine flowmeter is used to measure diesel fuel with the pipeline of DN40. The field needs to display and transmit the current signal. The accuracy is 0.5 grade, with 304 stainless steel material, and the meter withstand pressure of 1.6MPa,and the range is standard. The product model shall be: LWGY-40(FL)/C/05/S/S/E/H16.
Installation Dimensions
Thread connection and flange connection are used for the installation of the sensor according to different specifications. The installation method is shown in Figure 4, Figure 5 and Figure 6. The installation dimensions are shown in Table 2.
Table 2
|
Nominal diameter（mm >
|
L(mm)
|
G
|
D(mm)
|
d(mm)
|
Number of holes
|
|
4
|
225
|
G1/2
|
|
|
|
|
6
|
225
|
G1/2
|
|
10
|
345
|
G1/2
|
|
15
|
75
|
G1
|
Ф65
|
Ф14
|
4
|
|
20
|
80
|
G1
|
Ф75
|
Ф14
|
4
|
|
25
|
100
|
G5/4
|
Ф85
|
Ф14
|
4
|
|
32
|
140
|
G2
|
Ф100
|
Ф14
|
4
|
|
40
|
140
|
G2
|
Ф110
|
Ф18
|
4
|
|
50
|
150
|
G5/2
|
Ф125
|
Ф18
|
4
|
|
65
|
170
|
|
Ф145
|
Ф18
|
4
|
|
80
|
200
|
|
Ф160
|
Ф18
|
8
|
|
100
|
220
|
Ф180
|
Ф18
|
8
|
|
125
|
250
|
Ф210
|
Ф18
|
8
|
|
150
|
300
|
Ф250
|
Ф22
|
8
|
|
200
|
360
|
Ф295
|
Ф22
|
12
|
