Portable Density Meter

The LONN-UFM clamp on ultrasonic flow meter delivers non-intrusive, high-accuracy liquid flow measurement without cutting pipes. Featuring time measurement chip with ≤10ps precision, OLED display with 360° rotation, and magnetic bracket design for easy installation. Supports DN6-DN100 pipes, 4-20mA/RS485 outputs, IP54/IP65 protection. Ideal for chemicals, food, pharmaceuticals, and water treatment.

Measurement Principle： Time-of-flight ultrasonic (≤10ps time measurement)
Fluid Type： Liquid (water, chemicals, organic solvents, oils)
Accuracy： ±2.0% (at 0.3-5.0 m/s)
Output Signal： 4-20mA + RS485 Modbus-RTU
Protection Class： IP54 / IP65

LONN-MFC Thermal Mass Gas Flow Meter — Precision Gas Mass Flow Controller | LONNMETER

The LONN-MFC thermal mass gas flow meter is a high-precision instrument engineered for accurate mass flow measurement and control of industrial gases. Featuring proprietary thermal sensing technology combined with optimized algorithms and precision manufacturing processes, this thermal mass gas flow meter delivers industry-leading measurement stability with ultra-low zero drift and temperature drift characteristics—even under extreme operating conditions.

Measurement Principle： Thermal Dispersion (Constant Temperature Difference)
Fluid Type： Gas (Air, N₂, O₂, Ar, CO₂, CH₄, etc.)
Flow Range： 0–150 L/min (N₂ reference)
Accuracy ：±1.0% S.P. (>30% F.S.) / ±0.3% F.S. (<30% F.S.)
Output Signal： RS-485 Modbus RTU / EtherCAT / 4-20mA / 0-10VDC / 0-5VDC / ProfiNET / ProfiBUS
Protection Class： IP40

Precision Thermal Mass Flow Meter — LONN-GMFC Professional Gas Mass Flow Meter Series | LONNMETER

The LONN-GMFC thermal mass flow meter delivers direct mass flow measurement for industrial gases without temperature or pressure compensation. Using advanced constant temperature difference technology, this thermal gas flow meter achieves wide turndown ratios from 0.5 to 100 Nm/s. Available in both insertion and inline configurations, the LONN-GMFC series supports pipe sizes from DN15 to DN6000, making it ideal for compressed air, natural gas, biogas, and process gas measurement applications.

Measurement Principle: Thermal Mass (Constant Temperature Difference)
Fluid Type: Various gases (except acetylene)
Accuracy: ±1.5% – 2.5% FS
Flow Velocity Range: 0.5 – 100 Nm/s
Operating Temperature： Sensor: -40°C to +200°C (standard), +450°C (high temp)
Operating Pressure： <4.0 MPa (inline), <2.5 MPa (insertion)
Response Time： 1 second (adjustable)
Output Signal： 4-20mA, RS-485, HART, FF, Pulse
Display： 4-line Chinese LCD
Protection Class： IP67 (integral), IP68 (remote)

Precision Gear Flow Meter — LONN-GF Professional Positive Displacement Flow Meter Series | LONNMETER

The LONN-GF gear flow meter is a precision positive displacement flow meter engineered for accurate volumetric measurement of high viscosity liquids. Utilizing advanced oval gear technology, this mechanical flow meter delivers exceptional repeatability across demanding industrial applications including petroleum, chemical processing, hydraulic systems, and fuel monitoring. With robust 316 stainless steel construction and multiple output options, the LONN-GF series ensures reliable performance in harsh operating environments.

Fluid Type: High viscosity liquids, oils, fuels, chemicals

Accuracy: ±0.5% FS
Repeatability: ±0.2%
Body Material: 316 Stainless Steel / Aluminum Alloy
Gear Material: PPS / PTFE / 316SS (optional)
Process Connection: Flange / Thread (customizable)
Output Signal: 4-20mA / Pulse / RS485 Modbus RTU
Power Supply: DC 12-24V / AC 220V
Temperature Range :-20°C to +120°C (standard)
Pressure Rating: PN16 / PN25 / PN40 (optional)
Protection Class: IP65 / IP67

Reliable LONN-UL25 ultrasonic level gauge for multiple scenarios | LONNMETER

The LONN-UL25 ultrasonic level meter provides continuous, non-contact liquid level measurement for water, oil, and chemical storage tanks. Using high-frequency pulse acoustic technology, it measures levels from 0 to 25 meters with ±0.25% accuracy. The integrated design combines transmitter, display, and RS485 communication in an IP65/IP68-rated housing, delivering 4–20mA analog output plus Modbus RTU digital interface. Ideal for industrial water treatment, petroleum storage, and chemical processing applications.

Measurement Range: 0–5m / 0–10m / 0–15m / 0–20m / 0–25m (customizable)
Blind Zone: 0.25m – 0.6m (range-dependent)
Accuracy: ±0.25% – 0.5% FS
Resolution: 1mm
Output Signal: 4–20mA + RS485 Modbus RTU
Power Supply: DC12V / DC24V / AC220V (with built-in lightning protection)
Protection Rating: IP65 / IP68
Operating Temperature: -20°C to +60°C
Process Pressure: < 4 atmospheres
Display: Integrated LCD (level or distance)

LONN-ND50 Integrated Online Viscosity Meter | LONNMETER

The LONN-ND50 is an inline industrial viscometer that measures liquid viscosity using a metal tuning fork vibration principle. Designed for inline installation in chemical, pharmaceutical, food, and petroleum refining processes, it delivers real-time 4–20mA and RS485 Modbus RTU outputs with Ex d II BT6 explosion-proof certification. Field-configurable via built-in meter menu.

Viscosity Range: 0–10,000 mPa·s (calibratable to custom range)
Viscosity Accuracy: ±2.5%
Temperature Range (Media): 0–60°C
Temperature Range (Ambient): -40–85°C
Output Signal: 4–20mA active + RS485 Modbus RTU
Signal Mode: 4-wire system
Explosion Protection: Ex d II BT6
Working Pressure : <1 MPa
Power Supply: 24VDC

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