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Yueheng Instrument & Apparatus

PRODUCTS

Metal tube float flowmeter

○ Metal tube float flowmeter

○ Micro metal tube float flowmeter

○ All stainless steel metal tube float flowmeter

○ Magnetic filter

Glass rotameter

○ Imported series glass rotameter

○ Domestic series glass rotameter

Turbine flowmeter

Vortex Flowmeter

Constant current purging device

Plastic rotameter

○ Plastic rotameter

○ Panel flowmeter

○ Pipeline flowmeter

Micro metal tube float flowmeter

MF small golden brick


Side in and side out	Side in and side out	Side in and side out

Side in and side out	Lower in and upper out	Lower in and upper out

MK alarm petty cash transfer

MK small gold transfer

MT petty cash transfer


Side in and side out	Side in and side out	Side in and side out

Up in and down out

Flange Xiaojinzhuan


MF flange connection	MF flange connection	MF flange connection

MK flange connection	MK flange connection	MK flange connection

Anticorrosive


MF Small gold transfer	MF Small gold transfer	MF Small gold transfer

MT Small gold transfer

Remote transmission small gold transfer

1. Overview

LZZ (D) W series is a micro-flow metal tube float-type flow measuring instrument, which can measure liquid, gas or steam. The instrument adopts the variable area measuring principle, and the measuring part is composed of a conical measuring tube and a float, which has the characteristics of firmness, stability and wide application range. The connection mode includes horizontal connection or vertical connection, and the pressure regulator (constant flow valve) with inlet pressure change or outlet pressure change can also be selected. It is widely used in micro flow measurement and process control in petroleum, chemical, chemical fiber, steel, food, light industry, pharmaceutical and other industries.

LZZW series is a field indicating instrument, which can be equipped with one or two intrinsically safe and explosion-proof alarm switches (associated equipment is required); LZDW series is an electric remote type instrument, which outputs 4~20mA current signal (compatible with HART communication protocol), and uses LED light column to indicate the flow on site.

2. Model designation

L Z		W—
	Z	Local indication type
	D	Electric remote transmission type
			Y10	Lower in and upper out			Structural form (medium flow direction)
			Y20	Side in and side out			Structural form (medium flow direction)
				RR1	304		Wetted material
				RRL	316L		Wetted material
					K1	With an upper limit alarm point
					K2	With a lower limit alarm point	Additional features
					K12	With one upper limit and one lower limit alarm point

L Z□　　　W — □ /　　　　□ /　　　　□

3. Main technical parameters

1. Measuring range: water (20 ℃) 0.3~100L/h air (20 ℃ 101325Pa) 5~3400L/h
2. Range ratio: 10 ∶ 1
3. Accuracy class: 4.0
4. Working pressure: 2.5MPa or 6.4MPa
5. Medium temperature: - 80~+150 ℃
6. Ambient temperature: - 25~+65 ℃
7. Connection mode: 1/4 ″ NPT internal thread, optional Φ 6（ Φ 8) Ferrule connection or according to user requirements 8. Limit alarm: 1~2 alarm switches (optional, explosion-proof grade ExiaIICT3-T6)
9. Electric remote transmission: power supply voltage: 24 (1 ± 10%) V DC
Output signal: (4~20) mA DC, two-wire system (compatible with HART communication protocol) load resistance: ≤ 500 Ω (24V DC)
10. Protection grade: IP67

4. Measuring range

Number	water	Air	Pressure loss
Number	（20℃ L/h）	（20℃ 101325Pa L/h）	（kPa）
	（20℃ L/h）	（20℃ 101325Pa L/h）	（kPa）
Y01	—	5～50	1.2
Y02	0.3～3	10～100	1.4
Y03	0.5～5	15～150	1.5
Y04	1～10	40～400	1.8
Y05	2.5～25	80～800	3.5
Y06	4～40	125～1250	6.5
Y07	6～60	200～2000	13.0
Y08	8～80	250～2500	23.5
Y09	10～100	340～3400	40.0

Note: When measuring liquid, ensure that the working pressure is not less than 2 times the pressure loss; When measuring gas, ensure that the working pressure is not less than 5 times the pressure loss to make the flowmeter work stably.

5. Outline and installation dimensions


LZZW-()/Y20/RR1 (Horizontal connection)	LZZW-()/Y10/RR1 (Vertical connection)	LZDW-()/Y10/RR1/ESK (Horizontal connection)

6. Main parts

spare parts	Standards	Special
Base	304	316L or according to user requirements
Conical tube float	304	316L or according to user requirements
Indicator housing	Cast aluminium

7. Technical parameters of alarm associated equipment

Micro-flow metal tube float flowmeter with alarm switch shall be equipped with associated equipment. Isolated safety barrier or transistor relay WE77/Ex-1 and WE77/Ex-2 with proximity switch input can be selected.
The transistor relays WE77/Ex-1 and WE77/Ex-2 are composed of power pack, transistor amplifier and intermediate relay. WE77/Ex-1 has one safety control circuit and WE77/Ex-2 has two safety control circuits.

Product model	WE77/Ex—1、WE77/Ex—2	WE77/Ex—1D、WE77/Ex—2D
Power supply	220V AC	24V DC
Power consumption	3.5W
Open-circuit voltage	8V DC（13.5V）	8V DC（13.5V）
short-circuit current	8mA（31mA）	16mA（62mA）
Allowable inductance	3mH（31mH）	1mH（7.6mH）
Allowable capacitance	230nF（609nF）	160nF（539nF）
Input/output circuit	Single circuit	Double circuit
Switch contact load	4A/250VA/cosφ=0.7


Connection diagram of WE77/Ex-1 and alarm switch	Connection diagram of WE77/Ex-2 and alarm switch

Including 1: alarm switch 3, WE77 4, power supply 5, output terminal

8. Installation and maintenance

1. Before the flowmeter is installed in the process pipeline, the process pipeline shall be purged or cleaned to prevent impurities in the pipeline from blocking the instrument and affecting its normal use.
2. The flowmeter shall be installed vertically with the medium flow upward, and the included angle between the center line of the flowmeter and the vertical line shall not exceed 5 °.
3. In order to prevent the pipeline from being compressed and deformed, the flowmeter interface must be aligned and parallel to the pipeline axis. If necessary, properly support the pipeline on both sides of the flowmeter to prevent vibration and reduce the axial pressure of the flowmeter.
4. If the medium contains solid impurities, a filter shall be installed upstream of the flowmeter.
5. In order to facilitate maintenance and cleaning, it is recommended to install bypass pipeline.
6. To ensure stable flow indication, it is recommended to install a flow regulating valve downstream of the flowmeter.
7. When measuring liquid, ensure that the working pressure is not less than 2 times the pressure loss; When measuring gas, ensure that the working pressure is not less than 5 times the pressure loss to make the flowmeter work stably.
8. The instrument works based on the principle of magnetic coupling. It should be ensured that the magnetic field generated by other equipment around the instrument will not affect the measurement results.

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