Product Overview

The Digital Turbine Flow Meter measures fluid flow based on rotor speed generated by the fluid passing through the meter.

Technical Specifications

Category	Item	Specification
Performance	Flow Range (Turndown)	10:1 to 20:1 (e.g., 0.5 – 5 m³/h for DN25)
	Accuracy	±0.5% (liquids) / ±1.0% (gas) / ±0.2% (optional)
	Repeatability	±0.05% – ±0.2%
	K-Factor	100 – 50,000 pulses/L
Process Conditions	Nominal Diameter	DN4 – DN200 (0.15" – 8")
	Pressure Rating	1.6 / 4.0 / 6.3 MPa
	Medium Temperature	-20°C to +120°C / up to +150°C
	Ambient Temperature	-20°C to +60°C
	Humidity	5% – 95% RH (non-condensing)
	Viscosity Limit	≤ 5 cSt (5×10⁻⁶ m²/s)
Electrical	Power Supply	24V DC / 3.6V battery
	Output Signal	Pulse / 4–20 mA
	Communication	RS485 (Modbus-RTU), HART
	Electrical Connection	M20×1.5 / 1/2" NPT
Mechanical	Protection Class	IP65 / IP67
	Explosion Protection	Exd II BT6 Gb / Exia II CT6 Ga
	Body Material	SS304 / SS316
	Rotor Material	Duplex SS / Tungsten Carbide
	Bearing Material	Tungsten Carbide / Ceramic
	Connection Type	Flange / Thread / Tri-clamp (ANSI / DIN / JIS)

Industrial Applications

Application	How It Is Used
Petrochemical	Monitoring low-viscosity fuel and oil delivery
Water Treatment	Measuring clean water dosing in plants
Pharmaceutical	Tracking pure solvent volume in batches
Food & Beverage	Metering liquid ingredients and beverages
Power Generation	Monitoring cooling water consumption lines

Technical Design & Core Functionality

Corrosion-Resistant Material Matrix
Stainless steel housing combined with tungsten carbide bearings is used in chemical media and continuous mechanical wear environments.

Dual-Line Digital Indicator
The local LCD displays real-time flow rate and total accumulated value.

Flexible Power Configurations
Supports dual-mode operation via internal lithium batteries or external 24V DC loops.

Industrial Protocol Connectivity
Integrated Modbus-RTU communication enables direct data connection with industrial SCADA networks.

Electromagnetic Interference Shielding
Specialized circuit design protects signal integrity against high-frequency industrial noise.

Compliance & Certifications

Regulation / Standard	Certification Scope
ATEX / IECEx Hazardous Area	Certified for safe operation in explosive gas and dust hazardous zone environments
NIST-Traceable Calibration	Wet calibration process aligned with recognized national metrology standards
Individual Calibration Certificate	Each unit is supplied with a unique factory calibration report verifying K-factor
CE Marking	Complies with basic safety, health, and environmental requirements for EU market access.
ISO 9001 Quality System	Manufacturing process follows internationally recognized quality management standards

Factory Capabilities

Automated CNC Machining
High-precision computer-controlled lathes maintain dimensional tolerances for all internal mechanical components.

Multi-Media Calibration Rigs
Dedicated liquid and gas loops perform volumetric flow verification across varying viscosities.

Automated SMT Assembly
In-house surface mount technology lines produce localized circuit boards with optical inspection.

Environmental Stress Screening
Climate chambers subject assembled electronics to thermal cycling and vibration testing.

Traceable Material Inventory
Raw steel and alloys undergo spectrographic verification before entering production lines.

Quality Control

1.1.5x Hydrostatic Pressure Testing
Meter bodies are tested at 1.5× rated pressure to verify sealing performance.

2.5-Micron Ultrasonic Cleaning
Multi-stage baths eliminate microscopic debris down to 5 microns to protect rotor clearance.

3.48-Hour Thermal Burn-In
Assembled electronics undergo 48-hour temperature cycling to minimize field component failures.

4.Multi-Angle X-Ray Radiography
Non-destructive welding inspection confirms joint integrity for high-vibration industrial applications.

5.5-Point Wet Calibration
Multi-point flow verification ensures stable and repeatable measurement accuracy.

FAQ

Q: Is the unique K-factor engraved on the nameplate or provided only in the report?

A: It is stamped on the steel nameplate and documented in the individual calibration certificate.

Q: Can the factory provide material traceability certificates for chemical plant audits?

A: Yes, EN 10204 3.1 material certificates are available upon request during order placement.

Q: What is the standard production lead time for an order of fifty units?

A: Standard production usually requires 10–15 working days after payment confirmation.

Q: How are custom-calibrated meters packaged to prevent salt-fog corrosion during sea freight?

A: Meters are vacuum-sealed in anti-static moisture-barrier bags with desiccant before seaworthy crating.

Q: Can the local electronic display be rotated if installed in a vertical pipeline?

A: The display enclosure can be adjusted in 90-degree increments for optimal viewing orientation.

HNF20-B Turbine Flow Meter Parameters
Specific Parameters	Value / Description
Measurement Principle	The core working principle of the liquid turbine flow meter is to use the kinetic energy of the fluid to drive the turbine to rotate, converting the volumetric flow rate into a measurable electrical signal. It belongs to the velocity type flow meter and is suitable for measuring clean, low-viscosity single-phase liquids.
Nominal Diameter Range	DN 4 to 300 (0.04m³/h to 1800m³/h)
Wetted Parts Material	Main body material: 304, 316 stainless steel, Impeller material: 430F, duplex steel
Connection Method	Internal thread: DN4～DN80; External thread: DN4～DN40; Flange connection: DN10～300; Sanitary clamp connection: DN4～DN100 (DN4～DN32 all use 50.5 chuck)
Maximum Measurement Error	Volumetric flow rate (standard operating conditions): ±0.5% reading ± 1 mm/s (0.04 in/s)
Measurement Range	0.04 m³/h to 1000 m³/h, 1:10/20
Maximum Process Pressure	40 MPa
Medium Temperature Range	-40 ~ +120 °C (-40 ~ 248 °F)
Ambient Temperature Range	–40 to +60 °C (–40 to +140 °F)
Transmitter Housing Material	Cast aluminum alloy AlSi10Mg (with coating); Stainless steel 1.4409 (model CF3M, performance similar to 316L); Stainless steel for sanitary transmitters
Display/Operation	Four-line backlit display with touch function (external operation possible) Supports configuration settings via local display and operating tools Optional remote display function
Inputs	Analog input, digital input
Outputs	4-20 mA (active/passive) 4-20 mA with HART protocol (active/passive) 4-20 mA with wireless HART Protocol 4-20 mA with RS485 Pulse/Frequency/Switch Output (Active/Passive)
Power Supply	DC 24V or 3.6V battery
Certificate	CE certified
Functional Safety	Complies with IEC 61508 standard, allowing use in safety applications specified in IEC 61511 standard

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