Product Overview

The Metal Tube Flow Meter is a variable area instrument for measuring liquid and gas flow.

Technical Specifications

Category	Parameter	Specification	Reference
Performance	Accuracy Class	Standard: Class 1.5Optional: Class 1.0 / Class 2.5	±1.5% FS±1.0% FS / ±2.5% FS
	Turndown Ratio	Standard: 10:1Optional: 12:1	Optional
	Repeatability	≤0.5%	Max. ±0.5%
	Flow Range (Water)	0.0025–100 m³/h	By size
	Flow Range (Air)	0.07–3000 m³/h	By size
Process & Physical	Nominal Diameter	DN15–DN150 (1/2"–6")	±1 mm
	Pressure Rating	DN15–DN50: ≤4.0 MPaDN80–DN150: ≤1.6 MPaOptional: ≤16 MPa	1.5 × PN Test
	Process Temperature	Standard: -80°C to +200°CHigh-Temperature Jacket: up to +400°C	Optional
	Ambient Temperature	Pointer: -40°C to +85°CDigital: -20°C to +70°C	Operating Limit
	Fluid Viscosity	DN15: ≤30 mPa·sDN25–DN100: ≤250 mPa·s	Reference
Electrical & Signals	Power Supply	Mechanical: No PowerRemote: 24 VDC (12–36 VDC)Battery: 3.6 V	±10%
	Output Signal	4–20 mAPulse Output	±0.1% FS
	Digital Communication	HARTModbus RS485Profibus-PA	Optional
	Alarm Output	High / Low Limit Switches(NAMUR or Relay)	±1% FS
Mechanical	Wetted Materials	316 / 316L SSPTFEHastelloyTitanium	ASTM / EN
	Process Connection	Flange (ANSI / DIN / JIS)ThreadedTri-Clamp	±1.5 mm
	Protection Rating	IP65 / IP67	IEC 60529
	Hazardous Area Approval	Ex d IIC T6 GbEx ia IIC T6 Ga	ATEX / IECEx

International Certifications & Compliance

Standard Type	Compliance Scope
Hazardous Area	ATEX / IECEx
Quality Assurance	ISO 9001
European Conformity	CE Mark
Metrology & Sizing	Traceable Calibration Certificate
Material Traceability	EN 10204 3.1 Material Certificate

In-House Calibration & Quality Control

1.Flow Calibration: Conducted on water or gas calibration systems before shipment.

2.Pressure Integrity: Hydrostatic pressure testing confirms pressure containment at specified ratings.

3.Nondestructive Testing: Dye penetrant and radiographic testing are available for specified welded components.

4.Dimensional Inspection: Dimensional inspections confirm flange dimensions and assembly tolerances.

5.Signal Verification: Signal output testing confirms proper operation across the measurement range.

6.Traceability Logging: Production records link test reports with material traceability documents.

Customization

Meter Configuration: Size, material, pressure rating, and output options can be specified during ordering.

Thermal Management Jackets: Optional steam or hot oil jackets help maintain fluid temperature during operation.

Indication Housing Variants: Aluminum or stainless steel housings are available for different installation environments.

Process Connection Adaptability: Flange connections are available to international standards or project requirements.

Applications

Industry Sector	Typical Applications
Chemical & Petrochemical	Chemical dosing, acid transfer, hydrocarbon processing, and process fluid measurement.
Oil & Gas Operations	Production separators, refinery blending, pipeline flow measurement, and chemical injection lines.
Power Generation	Boiler feedwater systems, cooling water circulation, condensate recovery, and utility processes.
Water Treatment	Flocculant dosing, wastewater treatment, sludge processing, desalination systems, and water distribution networks.

FAQ

Q: Do you provide the calculation sheet for sizing validation before production?

A: Yes, sizing reports including flow, pressure drop, and velocity data are available before production.

Q: Will a sudden change in fluid density require factory recalibration?

A: Significant density changes may require a revised scale or correction factor to maintain accuracy.

Q: Can we replace the electronic transmitter module on-site without breaking the process seal?

A: Yes, the transmitter module can be replaced without opening the wetted measuring tube.

Q: What happens if the process flow rate exceeds the maximum scale limit?

A: The float reaches the upper limit and the meter indicates an over-range condition.

Q: Can the meter be supplied with a custom flow scale?

A: Yes, scales can be customized according to the specified operating flow range and fluid properties.

HNF50 Metal Float Flow Meter
Specific Parameters	Value / Description
Measurement Principle	Adopting the variable area measurement principle, it is suitable for flow measurement of liquids and gases. All metal structures, including pointer type, electric remote transmission type, corrosion-resistant type, high-pressure type, jacket type, and explosion-proof type. It is equipped with standard analog signal output and local indication.
Nominal Diameter Range	DN15 ~ DN150
Wetted Parts Material	The measuring tube and float materials are optional: 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti), 316L (00Cr17Ni14Mo2), Hastelloy B/C, Titanium/Titanium Alloy, PTFE Lined. Hygienic surface roughness < 0.8Ra
Connection Method	Standard type: Flange connection (standard GB/T9119-2000), flange clamp connection method can also be provided.
Maximum Measurement Error	Accuracy ≤±1.5% FS (typical), ≤±1.0% FS (maximum)
Measurement Range	Liquid: 2.5 ~ 1,000,000 L/h; Gas: 0.07 ~ 3,000 m³/h Range ratio: 10:1, 20:1 (customizable)
Maximum Process Pressure	DN15, DN25, DN50: 4.0 MPa; DN80, DN100, DN150: 1.6 MPa
Medium Temperature Range	Standard type: -30℃ ~ +120℃; High temperature type: 120℃ ~ 350℃; PTFE lined: up to 80℃
Ambient Temperature Range	On-site type: -40℃ ~ 120℃; Remote type: -30℃ ~ 70℃
Transmitter Housing Material	Carbon steel or stainless steel (optional depending on the model)
Display/Operation	Provides 0-10mA and 4-20mA local indication, supports accumulation, digital communication, and field modification of measurement parameters
Inputs	Analog Input
Outputs	Two-wire: 4-20mA DC, 4-20mA+HART protocol; Three-wire: MODBUS (RTU mode); Accumulative pulse output (24V, 50% duty cycle); Optional relay alarm
Power Supply	24VDC (12~36VDC); Lithium battery power supply; 220VAC
Certificate	CE Certification; Protection Level IP65; Explosion-proof type available (option)
Functional Safety	Ex ia IIC T1~T4 Ga

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