Ultrasonic liquid flow meter | sensor | DN15-100mm | -30~70℃ | 230VAC/24VDC | RS485/4-20mA | Modbus RTU

Technical specifications:

Measurement accuracy: ±1.5%
Repeatability: ±0.2%
Flow measurement range:
• DN15–DN100 pipes
• Flow velocity: 0.3–4 m/s (DN200 and below), 0.3–6 m/s (above DN200)

Measurement principle: Transit-time ultrasonic method, dual processors, 4-byte floating-point calculation
Measurement interval: 500 ms (2 times per second)
Power supply: 220 VAC or 24 VDC (isolated)
Power consumption: ~50 mA (without keyboard and buzzer)
Display: 2 lines of 10 characters with backlight
Signal inputs:
• 3 channels of 4–20 mA analog inputs
• 2 channels of 3-wire resistor inputs

Signal outputs:
• 1 RS485 output
• 1 analog 4–20 mA or 0–20 mA output (active or passive)
• Supports HART or OCT protocols

Protocol: Modbus RTU
Sensor: External clamp-on type, non-invasive
Liquid temperature: -30 °C to +70 °C
Pipe types: Steel, stainless steel, cast iron, carbon steel, PVC, glass
Memory:
• Stores up to 512 days of data
• Saves 128 months of statistics
• Automatically logs last 30 startups

Functions:

Accurate and non-invasive fluid flow measurement
Data storage and analysis via Modbus RTU
Bilingual display with backlight
Simple configuration by entering pipe and medium details
Can be part of a larger automation system
Supports multiple channels

Applications:

Industrial process control
Building engineering systems (heating, cooling, water supply)
Water management and environmental projects
Energy sector
Laboratory research and scientific testing

Pros:

Non-invasive installation – no need to drill or cut pipes
Wide compatibility with pipe materials and liquids
Reliable RS485 and 4-20 mA output for integration with SCADA, PLC, etc.
Automatic memory – long-term data analysis
Suitable for both hot and cold liquids

Cons:

Requires precise installation and pipe specification entry
Only for liquid flow – not suitable for gases
External sensor may be sensitive to vibrations or temperature changes