Product Overview

The Digital Vortex Flow Meter measures liquid, gas, and steam flow by detecting vortex frequencies generated behind a fixed bluff body.

Technical Specifications

Parameter	Specification
Applicable Media	Steam, Gas, and Low-Viscosity Liquids
Accuracy	Liquid: ±1.0% of Rate; Gas/Steam: ±1.0% ~ ±1.5% of Rate
Repeatability	≤0.5%
Turndown Ratio	10:1 ~ 20:1
Velocity Range	Liquid: 0.5 ~ 7 m/s; Gas/Steam: 5 ~ 60 m/s
Fluid Temperature	−40°C ~ 150°C (Up to 350°C Optional)
Operating Pressure	Up to 4.0 MPa (Higher Ratings Optional)
Pipe Size	DN15 ~ DN300
Process Connection	Wafer, Flanged, Insertion
Wetted Material	304 SS, 316L SS
Power Supply	24 VDC or 3.6 V Lithium Battery
Output Signal	4–20 mA, Pulse, HART, RS485, Profibus PA
Protection Rating	IP65 / IP67
Explosion Protection	Ex ia / Ex d Certified
Ambient Temperature	−30°C ~ 60°C

Technical Advantages & Design

Dual-Sensor Vibration Compensation
Dual piezoelectric sensors reduce pipeline vibration interference during vortex signal detection.

Digital Signal Processing
Digital DSP algorithms filter flow disturbances and improve low-flow signal stability.

Bluff Body Structural Integrity
CNC-machined one-piece bluff bodies avoid weld joints and maintain structural consistency.

Dual-Compartment Housing Design
Separates terminal wiring from electronic circuitry to reduce moisture exposure during installation.

Applications

Industry	Typical Application	Benefit
Chemical Processing	Corrosive liquid and gas measurement	Suitable for corrosive process media monitoring
Steam & Energy	Steam and utility monitoring	Steam consumption measurement
Oil & Gas	Natural gas and flare gas measurement	Natural gas and flare gas monitoring
Industrial Gases	Nitrogen, oxygen, and compressed air metering	Low pressure loss
Power Generation	Superheated steam measurement	High-temperature durability
Water Management	Water treatment and distribution systems	Reduced maintenance requirements

Compliance & Certifications

CE Conformity
Available with CE-marked configurations for applicable project requirements.

ATEX/IECEx Certified
Certified for hazardous Zone 1 and Zone 2 gas/dust atmospheres.

ISO 9001:2015 Facility
Manufactured under ISO 9001:2015 quality management procedures.

Verified Calibration Loop
Each unit is calibrated on factory flow test equipment before shipment.

Traceable Documentation
Supplied with an individual calibration certificate.

Factory Capabilities & QC

Factory Capabilities
1.Multi-Method Calibration Loops: Factory operates gravimetric and master-meter calibration systems for flow verification.

2.Automated Gas Flow Lines: Sonic nozzle systems support calibration across specified gas flow ranges.

3.Global Flange Customization: Available with ANSI/ASME, DIN, and JIS flange standards.

4.Bespoke OEM/ODM Services: Supports private labeling, customized nameplates, and display language options.

QC
1.Incoming Material Inspection: XRF analysis verifies chemical composition of incoming stainless steel materials.

2.Thermal Aging Verification: Electronic assemblies undergo high and low temperature verification before final assembly.

3. Hydrostatic Pressure Testing: Each flow body undergoes hydrostatic pressure testing before shipment.

FAQ

Q: Can the display screen be rotated if the meter is installed on a vertical pipeline?

A: Yes, the transmitter housing can be rotated in 90° increments for easier local viewing.

Q: What straight pipe length is required upstream and downstream of the installation point?

A: A minimum straight pipe length of 10D upstream and 5D downstream is generally recommended.

Q: Is the internal configuration data lost during an extended power outage?

A: No, parameter settings are retained in non-volatile EEPROM memory during power interruptions.

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

A: Yes, EN 10204 Type 3.1 material certificates for the wetted pressure boundary can be supplied upon request.

Q: What is the standard turnaround time for factory recalibration services?

A: Typical recalibration service requires approximately 5–10 business days.

HNF40-A Vortex Flowmeter Parameters
Specific Parameters	Value / Description
Measurement Principle	The intelligent industrial vortex flowmeter works based on the principle of the Karman vortex street. When the fluid flows through the vortex-generating body with a triangular pillar in the pipeline, a regular vortex row (i.e., the Karman vortex street) is alternately generated on both sides downstream. The frequency of vortex separation is directly proportional to the flow rate of the fluid. The sensor detects this frequency signal through built-in piezoelectric elements, and after processing by the internal microprocessor and intelligent converter, it can accurately calculate the instantaneous and cumulative flow rate of the fluid, and output a standard signal.
Nominal Diameter Range	Standard: Full-bore type DN15~DN400 Insertion type: DN200-DN1500 Small caliber: DN6~DN12
Wetted Parts Material	304 Stainless Steel
Connection Method	Clamp type Flange type Insert type Pipe thread
Maximum Measurement Error	Liquid: ±0.5% ±1.0% ±1.5% Gas: ±0.5% ±1.0% ±1.5% ±2.5%
Measurement Range	Liquid: 0.2-690000 m³/h Gas: 3-3750000 m³/h
Maximum Process Pressure	Standard pressure grade ≤2.5MPa~4.0MPa Extended pressure grade (ordered by agreement) >4.0MPa~45MPa
Medium Temperature Range	Standard range: -40～+250℃～350℃ Extended range (ordered by agreement) > +350℃～500℃
Ambient Temperature Range	Non-explosion-proof location -40~+55℃ Explosion-proof location -20~+55℃
Transmitter Housing Material	Aluminum alloy shell
Display/Operation	Instantaneous flow, cumulative flow, flow unit, flow percentage, etc.
Inputs	0
Outputs	Frequency/pulse output: 2~3000Hz, low level ≤1V, high level ≥5V Two-wire system, 4-20mA output ≤300Ω explosion-proof load, non-explosion-proof load ≤500Ω HART, Modbus RTU (RS485), wireless transmission
Power Supply	Pulse: 12VDC~+24VDC Current: +24VDC 4-20mA Battery: 3.6V
Certificate	0
Functional Safety	Ex ia IIC T1~T4 Ga

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