LZ Series Variable-area Flowmeter With Metallic Measuring Tube

　　LZ Series Variable-area Flowmeter with metallic measuring tube has the characteristics of simple structure, reliable, wide application field, high precision, convenient for installation. Compared with the variable-area flowmeter with glass tube, this series has the characteristics of high-pressure resistant, high-temperature resistant, safe, ocular reading etc. It is suitable to measure the opaque or corrosive medium. The tube and the flange are made material of stainless steel(1Cr18Ni9Ti or 316L). The orifice, float of normal type are made of stainless steel. The orifice , float and the tube lining of anticorrosion type are made of PTFE(Teflon).

NOTE: Our company also produces DN4~DN100 whole series of Variable-area Flowmeter with Glass Tube.

Measuring Principle

　　LZ Series Flowmeter with Metallic Measuring Tube is of Variable-area Flowmeter . As the fluid flow upward in the tube, the float moves upward to a certain position where the lifting force and the gravitational force are balanced, at the moment, the circulation area between the float and the orifice(or the conical tube) is kept fixed. The circulation area is proportional to the height of the float, it means the height of the float represent the volumetric flowrate. When the float moves up and down , it transmits its positional to the indicator outside in form of magnetic-coupling, so make the needle of the indicator follows the movement of the float, and by using the cam board to show the value of flowrate linearly on the indicator.
Electrical remote transmission of this flowmeter means that it can read the flowrate by the needle of the indicator on-site directly, also through the angular displacement sensor and electric circuit, converts into 4～20mA and send out.

Technical Parameter

Instrument version

LZZH LZDH Series

Flow range

Water 2.5~100000L/h Air 0.07~800m3/h (See table below)

Range ration

DN≤100mm: 10:1DN＞100mm: 5:1

Accuracy

Standard type:±2.5%FS, Special order: can be up to ±1.5 %FS

Maximum working Pressure

DN15，DN25，DN40，DN50：4.0MPa DN80,DN100,DN150:1.6MPa

Maximum workingn Pressure

Normal type H1:-40℃~100℃， High temperature type H2:-80℃~250℃

Environment temperature

-25℃~+55℃

Connection form

Flange connection(Flange standard: Refer to GB9115-88,JB82-59),
can be made in accordance with the user's requirement.

Explosion-proof class

ExibⅡCT4 together with the safety battier LB987S
Explosion-proof number of certificate GYB00563

Protection grade

IP65

Viscidity

DN15：≤5mPa·s, DN25~DN150: ≤250mPa·s

Products executive standard

JB/T6844-1993

Specification

Diameter
(mm)

Working
code

Flow range

Pressure loss kPa

Water L/h*

Air m3/h*

Water

Air

Normal
type

Corrosion-proof type

Normal type

Normal typeCorrosion-proof type

Corrosion-proof type

Air

1A
1B
1C
1D
1E
1F
1G
1H
2A
2B
2C
2D
4A
4B
5A
5B
5C
8A
8B
10A
15A

2.5~25
4.0~40
6.3~63
10~100
16~160
25~250
40~400
63~630
100~1000
160~1600
250~2500
400~4000
500~5000
600~6000
630~6300
1000~10000
1600~16000
2500~25000
4000~40000
6300~63000
20000~100000

— —
2.5~25
4.0~40
6.3~63
10~100
16~160
25~250
40~400
63~630
100~1000
160~1600
250~2500
300~3000
350~3500
400~4000
630~6300
1000~10000
1600~16000
2500~25000
4000~40000
——

0.07~0.7
0.11~1.1
0.18~1.8
0.28~2.8
0.48~4.8
0.7~7.0
1.0~10
1.6~16.0
3~30
4.5~45
7~70
11~110
12~120
16~160
18~180
25~250
40~400
60~600
80~800
——
——

6.5
6.5
6.6
6.6
6.8
7.0
8.6
11.1
7.0
8.0
10.8
15.8
10.8
12.6
8.1
11.0
17.0
8.1
9.5
15.0
19.2

—
5.5
5.5
5.6
5.6
5.8
6.1
7.3
5.9
6.0
6.8
9.2
8.6
10.4
6.8
9.4
14.5
6.9
8.0
8.5
—

7.1
7.2
7.3
7.5
8.0
10.8
10.0
14.0
7.7
8.8
12.0
19.0
9.8
16.5
8.6
10.4
15.5
12.9
18.5
19.2
20.3

15

25

540

50

80

100

150