The LZ series metal tube float flowmeter adopts the principle of variable area measurement and is produced as a metal tube float flowmeter. A flowmeter mainly consists of three basic parts: 1. measuring tube body; 2. Cone shaped float; 3. Indicator. The displacement of the float is proportional to the flow rate, and through a magnetic coupling system, the displacement of the float is transmitted to the indicator in a non-contact manner to indicate the flow rate. Different converters can also be installed to convert flow values into standard 4-20mA electric remote transmission signals, achieving functions such as remote display, recording, integration, and control.
LZ series metal tube float flowmeter, suitable for measuring liquids and gases. In the design of measuring tubes, various structural types of measuring tubes have been configured for different pipeline conditions and special fluid measurement requirements, such as insulation jacket type, damper type, etc. In addition to standard options, special designs can also be made for users, such as high-pressure and high-temperature types, to meet their requirements to the greatest extent possible.
The LZ series metal tube float flowmeter can provide reliable and applicable functional combinations for various application scenarios in indicator design. As indicated by on-site pointers, LCD displays instantaneous and cumulative flow rates, etc. In terms of indicator power supply selection, there are battery power supply, 24VDC power supply, and 220VAC power supply, which are convenient for users to choose based on on-site conditions. The LZ series metal tube float flowmeter is widely used in industries such as petroleum, chemical, power plants, food, pharmaceutical, water treatment, and other fields due to its simple structure, long service life, linear scale, and ability to measure liquids and gases.

■Technical Parameter	Square indicator	Circular indicator
Instrument model	LZ series metal tube float flowmeter	Medium temperature -80 ∽ 200 ℃ standard type
measuring range	(Point value) Select from flow chart	0-85 ℃ anti-corrosion type (fluorine lined)
water	20℃ 2.5-150,000L/h	-80-300 ℃ high temperature type
Air 1.013bar ABS 20 ℃ 0.07-3000m ³/h		Environmental temperature -25 ∽ 60 ℃
Range ratio	10： 1 5：1	Protection level IP65
accuracy class	1.5 2.5	Electrical signal output signal 4-20mA (two-wire system)
pressure loss	Refer to the flow chart	Linearity 1%
Measuring tube	Orifice measuring tube Cone measuring tube	Temperature effect 0.5%/10 ℃
scale division	Divided by traffic units	Electrical interface M20 × 1.5 standard type
Instrument caliber	DN15-DN150	Power supply 24V DC standard type
Flange connection	DN15-DN50/PN4.0 DN80-DN150/PN1.6	Power consumption ≤ 3W
Flange standard	GB/T9119-2000	Limit alarm power supply 24V DC
	It can also be manufactured according to the flange standards provided by the user	Power consumption ≤ 3W
Insulation jacket flange DN15 DN25/PN4.0		Contact capacity 3A/220V
Insulation jacket	Φ20	Working temperature -25 ∽ 60 ℃
special type	High pressure type, threaded type, and other special types	Explosion proof grade Exib Ⅱ CT5 Exd Ⅱ BT5
Viscosity	DN15≤5mPa.s	Explosion proof related equipment	Intrinsic safety barrier LB906
	DN25～ DN150≤250mPa.s

LZZLocal indication type

LZDElectric remote transmission type

caliber

15

20

25

32

40

50

65

80

100

125

150

structural style

F10 bottom in top out type (can be default)

F11 lower inlet side outlet type

F12 side in side out type

F13 right in left out type

F14 left in right out type

Liquid receiving material

RR0

316 / 0Cr18Ni12Mo2Ti

Applicable to structural types

F10

F11

F12

F13

F14

RR1

304 / 1Cr18Ni9Ti

F10

F11

F12

F13

F14

RL

316L

F10

F11

F12

F13

F14

RP

PTFE

F10

Ti

titanium alloy

F10

HC

Hastelloy alloy

F10

additional structure

T

Jacket type

Suitable for measuring device types

F10

Z

Damping type

F10

F11

F12

F13

F14

G

High temperature type

F10

F11

F12

F13

F14

Y

High pressure

F10

F11

F12

F13

F14

indicator

(For remote transmission 4-20mA standard current signal indicators,+HART protocol can be selected) On site pointer displays instantaneous flow rate 24VDC power supply, on-site pointer displays instantaneous flow, non-contact transmitter, remote transmission of 4-20mA standard current signal Equipped with an upper limit alarm point output Equipped with a lower limit alarm point output Equipped with an upper limit and a lower limit alarm point output

default

ES

K1

K2

K12

JSB

Battery powered, LCD displays instantaneous flow and cumulative flow

JSC

240VAC power supply, LCD displays instantaneous flow and cumulative flow 24V DC power supply, LCD displays instantaneous flow and cumulative flow 24V DC power supply, LCD display for instantaneous and cumulative flow, remote transmission of 4-20mA standard current signal For remote transmission of 4-20mA standard current signal indicators, the+HART protocol can be selected

JSD

JSE

HART

Explosion proof type

default

Common

Square indicator

Exi

Intrinsic safety explosion-proof type

Square indicator

Exd

Explosion proof type

Circular indicator

Example: LZ □ - □□□□□□□ Note: No options can be left blank. LZ D-15 /F10/RR0/T/ES/HART/Exi

Description: Electric remote transmission/DN15 caliber/bottom in and top out type/material 0Cr18Ni12Mo2Ti/jacket type/4-20mA/HART protocol/intrinsic safety explosion-proof

caliber	Water (L/h) 20 ℃ 101325Pa		Air (m ³/h) 20 ℃ 101325Pa.abs	High pressure loss (Kpa)
	Material RRO RR1 RL	Material PTFE	Material RRO RR1 RL	Material RRO RR1 RL	Material PTFE
15	2.5-25		0.07-0.7	6.5
	4-40	2.5-25	0.11-1.1	6.5	5.5
	6-60	4-40	0.18-1.8	6.6	5.5
	10-100	6-60	0.28-2.8	6.6	5.6
	16-160	10-100	0.4-4.0	6.8	5.8
	25-250	16-160	0.7-7.0	7.2	6.1
	40-400	25-250	1.0-10	8.6	6.1
	60-600	40-400	1.6-16	11.1	7.3
25	100-1000	60-600	3.0-30	7.0	5.9
	160-1600	100-1000	4.5-45	8.0	6.0
	250-2500	160-1600	7-70	10.8	6.8
	400-4000	250-2500	11-110	15.8	9.2
50	600-6000	250-2500	18-180	8.0	6.5
	1000-10000	400-4000	25-250	11.0	6.8
	1600-16000	600-6000	40-400	16.2	9.4
	2000-20000	1000-10000	60-600	16.2	14.5
80	2500-25000	1600-16000	60-600	8.2	6.9
	4000-40000	2000-20000	100-1000	9.5	8.1
	5000-50000	2500-25000	150-1500	9.5	8.1
100	6000-60000	4000-40000	180-1800	8.0	9.5
	8000-80000	5000-50000	240-2400	10.0	9.2
	10000-100000	8000-80000	300-3000	10.0	9.2
125	10000-100000	8000-80000	300-3000	10.0	8.5
	25000-125000	10000-100000		12.2	10.1
150	25000-125000	10000-100000		11.0	9.2
	30000-150000	30000-125000		13.2	12.1
Note: When used for measuring liquids, it should be ensured that the working pressure is not less than twice the pressure loss; When used for measuring gases, it should be ensured that the working pressure is not less than five times the pressure loss to ensure stable operation of the flowmeter; 2. Customized specifications such as DN20, DN32, DN40, DN65 can be made according to user requirements.

■magnetic filter：
If the medium contains ferromagnetic particles, a magnetic filter should be installed at the inlet of the flowmeter. The magnetic filter is equipped with magnetic rods arranged in a spiral pattern to minimize pressure loss. There are two types of magnetic filters that are suitable for all instrument sizes. The material is 304, 316 or 316L. When used for corrosive media, the cylinder and magnetic rod are wrapped in PTFE to prevent corrosion by the medium. The flange connection size of the magnetic filter is the same as the corresponding flowmeter.

■damping：
If the inlet flow rate (pressure) of the flowmeter is unstable, especially for gas measurement, a damper structure is designed to ensure the measurement accuracy of the instrument and extend its service life. Its structure is shown in the figure.
For gases with small particles or dust, dampers are not suitable for use. In this situation, to ensure normal operation, it is required that the inlet pressure be greater than 5 times the instrument pressure loss. For DN15 caliber, a pressure regulator (constant current regulator) can also be used to stabilize the flow rate.

■ Signal wiring:
Electric signal output power supply 24V DC standard type
Output signal 4-20mA (two-wire system) linearity 1% temperature effect 0.5%/10 ℃
High load resistance 270 Ω (24V DC)
Electrical interface M20 × 1.5 standard type
Power consumption ≤ 3W
Explosion proof grade ib Ⅱ CT5
Explosion proof associated equipment safety barrier LB906

Intrinsic safety explosion-proof system
The LZD series metal tube float flowmeter must be used in conjunction with the LB906 Zener safety barrier to form an intrinsically safe explosion-proof system. The wiring of this security system should avoid the influence of external electromagnetic interference as much as possible, and the cable distribution parameters should be controlled within 0.08 μ F and 2 mH. The high operating voltage of the control room instruments connected to the safety barrier or the high voltage that may be generated internally shall not exceed 250V rms. The safety barrier must be installed in a safe place. The installation, use, and maintenance of safety barriers should comply with the user manual. Users must carefully read the product manual and comply with the "Electrical Safety Regulations for Explosive Hazardous Areas of the People's Republic of China" when installing, using, and maintaining the LZD series metal tube float flowmeter.
The casing of the metal tube float flowmeter is equipped with a grounding terminal, and users should ensure reliable grounding during use.

Upper and lower limit alarm switch：
The limit switch alarm device of LZ series metal tube float flowmeter consists of limit pointer, contactless switch, asymptotic board, built-in amplification relay, and power supply. The power supply needs to be installed separately. When the asymptotic board passes through the gap of the contactless switch, an alarm signal is generated. Users can install one or two alarm systems as needed, and the switch points can be set through the limit pointer on the dial to achieve preset alarms for the upper, lower, or upper and lower limits of any flow rate. The position of the limit pointer simultaneously indicates the limit value.
Limit alarm power supply 24V DC; Power consumption ≤ 3W; Contact capacity 3A/220V; Working temperature -25 ° C to 60 ° C. The limit switch alarm device adopts a pre-set conversion amplification relay in the table, which directly outputs a contact capacity of 3A/220V normally open (standard type) or normally closed signal.

Attributes
[Origin]	Chinese Mainland
[Flow meter type]	rotameter