LV500 Series

The LV500 Series liquid flow meter uses the vortex shedding principle: the frequency of vortices formed behind a bluff body is used to determine flow rate. It is designed for industrial and OEM applications that require a compact, responsive flow measurement solution.

Measurement Principle: Vortex shedding
Flow Range: 2-100 L/min
Accuracy: ±3.0% F.S
Repeatability: ±0.5% F.S

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Configuration and suitability confirmed for your application.

Basic Parameters

Measurement Principle	von Kármán vortex shedding
Flow Accuracy	<±3.0% F.S
Repeatability	<±0.5% F.S
Response Time	Fast response

Flow Range by Model

LV74020	2-16 L/min
LV74040	5-40 L/min
LV74100	10-100 L/min

Pressure & Temperature

Pressure Rating	<2.0 MPa
Fluid Temperature Range	0-90°C
Measurable Temperature	90–100 °C (accuracy not guaranteed)
Ambient Temperature	-10°C~+55°C

Materials

Housing Material	PPS / SUS304 stainless steel
Construction	Compact design with a robust housing

Pipe Connections

Connection Method	Threads: G, RC, NPT
Thread Sizes	G3/8, G1/2, RC3/8, RC3/4, G1, NPT3/4, etc.
Permitted Tightening Torque	22–38 N·m (depending on thread size)

Electrical Parameters

Power Supply	DC 5-24V
Signal Outputs	RS485, 4-20mA, NPN, 1-5V, PNP
Electrical Conn.	M8 connector

Communication Protocol

Protocol Format	Modbus RTU
Baud Rate	4800/9600/19200/115200 bps
Data Bits	8 bits
Stop Bits	1 bit
Parity	None
Default Address	0x01 (configurable from 1–32)

Display & Operation

Display	LCD (optional)
Temperature Display	Temperature display option available
Display Rotation	Configurable display orientation (90° left/right)
Operation	3 buttons (central blue button and left/right arrow buttons)

Alarm Function

Alarm Enable	On/off selectable
Alarm Mode	Normally open / normally closed
High Alarm Limit	Configurable high flow limit (0–999)
Low Alarm Limit	Configurable low flow limit (0–999)

Installation Requirements

Upstream Straight Length	5–50 DN, depending on pipe arrangement
Downstream Straight Length	≥5DN
Installation Location	Avoid open filling or discharge locations; install in a low section of the pipe where possible.

Measurement conditions & notes

The LV500 uses vortex shedding measurement with no moving parts.
Low pressure drop and resistance to fouling support industrial use.
Fast response and stable measurement.
Output options include RS485, 4–20 mA, NPN, 1–5 V, and PNP.
Modbus RTU supports connection to a multidrop bus.
Temperature measurement and LCD options are available.
High and low flow alarms can be configured.
Applications include industrial processes, energy monitoring, environmental monitoring, laboratories, and transport equipment.

Confirm fluid compatibility, materials, connections, and available configuration with our team before ordering.