Guiyang.bai@honno-auto. com
86-13840589744
Precision liquid turbine flow meter engineered for clean, low-viscosity single-phase liquids such as water and oils with viscosity close to water. A precision-fitted turbine spins inside a straight measuring section; a non-contact sensor detects every blade pass and generates a pulse proportional to flow, giving high reliability with output ready for direct connection to a PLC. Full digital signal processing delivers strong anti-interference and high measurement accuracy. Nominal sizes DN4–DN300 cover flow rates from 0.04 to 1000 m³/h (rangeability 1:10/20). Wetted parts in 304/316 stainless steel with 430F or duplex-steel impellers; process connections: internal/external thread, flange DN10–DN300, and hygienic clamp connections (DN4–DN100, 50.5 mm tri-clamp for small sizes) for food & pharma lines. Accuracy ±0.5% of reading; pressure rating up to 40 MPa on request; medium temperature −40…+120 °C. Local 4-line backlit display with touch operation (configurable via display or PC tool, optional remote display). Outputs: 4–20 mA, 4–20 mA + HART, WirelessHART, 4–20 mA + RS485, pulse/frequency/switch; DC24 V or 3.6 V battery (wireless) powered. CE approved; functional safety per IEC 61508 / IEC 61511
The HNF20-B is a high-precision industrial liquid turbine flow meter. It uses fluid kinetic energy to rotate a turbine, converting volumetric flow into a measurable electrical signal – a velocity-type meter designed for clean, low-viscosity single-phase liquids.
With fully digital signal processing, strong anti-interference performance and reliable high-accuracy measurement, it features a 4-line backlit touch display for instantaneous flow and totalisation. Available with thread, flange or hygienic clamp connections from DN4 to DN300, and outputs including pulse, 4–20 mA, RS485, HART and WirelessHART, it is widely used for liquid dosing, circulating water, filtration systems, chemical production and pump protection.
Media: Water / low-viscosity oils Pipe size: DN4 – DN300 Accuracy: ±0.5% of reading Outputs: Pulse / 4-20mA / RS485 / HART Supply: 24 VDC / 3.6 V battery
Applications: liquid dosing & filling, circulating water metering, filtration monitoring, chemical fluid transfer, pump protection & condition monitoring, food & beverage processing, pharmaceutical fluid lines, lubricant metering, water treatment, energy consumption monitoring.
Select this model when all of the following conditions are met:
The measured medium is water or a clean, low-viscosity single-phase liquid similar to water, with low solids content.
Pipe diameter is between DN4 and DN300, and thread, flange or hygienic clamp connection is available.
Flow rate falls within 0.04–1000 m³/h and high-accuracy volumetric flow measurement plus totalisation is required.
Pulse, analogue or digital communication output is needed to interface with a PLC, DCS or supervisory system.
The application demands long-term continuous operation with low maintenance for stable industrial process metering.
Special requirements such as hygienic, high-pressure or battery-powered versions can be met by dedicated variants.
Please consult us first if: the medium contains many solids or fibres, high-viscosity liquids require in-line calibration, corrosive media need special materials, temperature exceeds rated limits, or bidirectional flow measurement is needed.
Standard accuracy of ±0.5% of reading with a 1:10/20 turndown. Fully digital signal processing delivers strong noise immunity and outputs ready for direct PLC integration for stable long-term industrial operation.
Male / female thread, flange and hygienic clamp process connections cover the full DN4 to DN300 range, suiting general industrial, high-pressure and food & pharma clean-line applications.
Pulse/frequency/switch, 4–20 mA analogue, RS485, HART and WirelessHART outputs interface directly with control systems, SCADA and energy management platforms.
CE marked and designed to IEC 61508 functional safety standards, suitable for safety-related applications per IEC 61511 in critical process metering and protection duties.
| Model | HNF20-B |
|---|---|
| Category | Liquid Turbine Flow Meter (velocity type) |
| Principle | Flow drives turbine rotation; non-contact sensor picks up speed and converts it to an electrical signal |
| Measured media | Water and clean low-viscosity oil-like liquids |
| Nominal sizes | DN4 – DN300 |
| Flow range | 0.04 – 1000 m³/h; turndown 1:10 / 1:20 |
| Accuracy | ±0.5% of reading |
| Body material | 304 / 316 stainless steel |
| Impeller material | 430F stainless steel / duplex steel |
| Process connections | Female thread DN4–DN80; male thread DN4–DN40; flange DN10–DN300; hygienic clamp DN4–DN100 |
| Max. working pressure | Up to 40 MPa (depends on size and connection) |
| Medium temperature | −40 … +120 °C |
| Ambient temperature | −40 … +60 °C |
| Display & operation | 4-line backlit touch display, local configuration, remote display option |
| Output signals | Pulse / frequency / switch; 4–20 mA; 4–20 mA + HART; 4–20 mA + WirelessHART; RS485 |
| Power supply | DC 24 V; 3.6 V lithium battery (wireless version) |
| Transmitter housing | Cast aluminium alloy (coated); stainless steel 1.4409; hygienic-grade stainless steel |
| Approvals & standards | CE marked; functional safety to IEC 61508 for IEC 61511 safety applications |
| Calibration note | Factory calibrated on water; wet calibration recommended for viscosities above 5×10⁻⁶ m²/s |
Confirm 4 items before ordering:
Pipe nominal diameter and connection type – to select the correct thread, flange or clamp variant.
Medium type, viscosity and temperature – to verify material compatibility; high-viscosity liquids need wet calibration.
Normal and maximum flow rate – to ensure the operating point falls within the optimal measuring range.
Output and power supply – select pulse, analogue or communication type and supply voltage.
Install with a minimum of 10D straight pipe upstream and 5D downstream, avoiding disturbed flow from pumps, valves and elbows. Align the flow arrow with the flow direction and keep the impeller axis concentric with the pipe. After wiring, verify the zero point at no-flow, then validate readings at normal flow; confirm instantaneous flow, totaliser and output signals before putting into automatic operation.
Pulse / frequency / switch output: connects directly to PLC high-speed counters or totalisers for flow totalisation, batch filling control and high/low flow alarming.
4–20 mA analogue output: delivers a continuous flow signal to PLC, DCS or chart recorders for process regulation, data acquisition and remote transmission.
RS485 / HART communication: supports remote parameter configuration, data reading and multi-instrument networking for SCADA and energy management systems.
Battery + WirelessHART: operates without external power, ideal for outdoor, remote and unpowered pipeline locations for wireless flow monitoring.
For OEM projects, please specify connection type, output protocol, supply method and display requirements with your enquiry so we can match the optimal configuration.
Provides high-accuracy flow metering for food & beverage, personal care and fine chemical filling machines, enabling batch control and production counting with excellent repeatability.
Used for water metering and energy statistics in industrial cooling circuits, water purification and wastewater plants, supporting process assessment and energy efficiency management.
Measures clean solvents, oils and chemical fluids for production metering, material accounting and auxiliary custody transfer, with high-pressure versions available.
Installed on pump discharge to monitor real-time flow, detect dry-running conditions and protect pumps; also used to compare filter inlet/outlet flow for clogging detection.
Hygienic clamp versions with 316L wetted parts meet clean-line metering requirements in food and pharmaceutical processes, compatible with CIP cleaning routines.
To confirm the correct HNF20-B configuration, please provide: nominal diameter, process connection (thread / flange / clamp and exact specification), medium name & viscosity, operating temperature & pressure, typical and maximum flow rate, output signal type, power supply method, display requirement and accuracy class. If necessary we will request additional details on straight pipe conditions and installation environment to ensure measurement accuracy and long-term stability.
Thread, flange and hygienic clamp connections are all available. Thread or flange suits general industrial use; hygienic clamp from DN4 to DN100 is for food & pharma clean processes.
Yes. A 3.6 V lithium battery version is available, combined with WirelessHART for cable-free flow monitoring in outdoor and remote pipeline locations.
Yes. The pulse/frequency output is a standard level signal that connects directly to PLC high-speed counter inputs for flow totalisation, batch control and alarm functions.
Standard accuracy class is ±0.5% of reading with a turndown of 1:10 to 1:20, delivering stable performance across the rated flow range for clean, low-viscosity liquids.
Communication options include 4–20 mA + HART, 4–20 mA + WirelessHART and RS485, selectable according to your host system and field wiring conditions.
HNF20-B Liquid Turbine Flow Meter Datasheet (PDF)
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Send us pipe size, connection type, medium, temperature/pressure, flow range and output type, and we will confirm whether HNF20-B is suitable and provide a selection recommendation before quotation.
Submit your application details »Contact: HongNuo
Phone: 13840589744
Tel: 86-13840589744
Email: Guiyang.bai@honno-auto. com
Add: Zhongguancun Innovation Center, No. 28 Huahai Road, Shenyang Economic and Technological Development Zone, Liaoning Province
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