Beijing Hangfeng FHV-3 Tri-Parameter In-Line Sensor for Density, Viscosity, and Temperature Measurement
| Brand | Beijing Hangfeng |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | FHV-3 |
| Pricing | Upon Request |
| Density Range | 600–1250 kg·m⁻³ |
| Viscosity Range | 1–1000 cP |
| Temperature Range | 0–100 °C |
| Density Accuracy | ±0.5% or ±5 kg·m⁻³ (whichever is greater) |
| Viscosity Accuracy | ±5% or ±1 cP (whichever is greater) |
| Dielectric Constant Accuracy | ±3% |
| Temperature Accuracy | ±0.5 °C |
| Resolution | Density 0.1 kg·m⁻³ |
| Response Time | <30 s (initial stabilization), 1 Hz data refresh rate |
| Output | RS485 MODBUS RTU |
| Power Supply | 9–32 VDC |
| Current Draw | <20 mA @ 24 VDC |
| Max Process Pressure | 10 bar (custom options available) |
| Fluid Temp. | 0–100 °C |
| Ambient Temp. | −40 to +85 °C |
| Storage Temp. | −40 to +100 °C |
| Housing Material | 316/304 stainless steel or Hastelloy C-276 |
| Mechanical Interface | G3/4″ |
| IP Rating | IP65 |
| Sealing Material | FKM fluoroelastomer |
| Cable | 2 m M8 6-pin |
| Max Flow Velocity | <0.1 m/s |
| Compliance | CE, ASTM D1657, EN 61326-1, EN 61326-2-3, ICES-003 Class B, National Metrology Verification Report |
Overview
The Beijing Hangfeng FHV-3 is a tri-parameter in-line sensor engineered for continuous, real-time monitoring of density, dynamic viscosity, and temperature in liquid process streams. It employs piezoelectric resonant technology—specifically, a quartz crystal microbalance (QCM) operating in shear-horizontal mode—to simultaneously extract density and viscosity from the resonant frequency shift and damping behavior of the oscillating element. Temperature is measured via an integrated Pt1000 RTD with traceable calibration. Unlike mechanical viscometers or vibrating fork densimeters, the FHV-3 contains no moving parts or consumables; its solid-state architecture ensures long-term stability and immunity to mechanical vibration, making it suitable for harsh industrial environments including offshore platforms, refinery pipelines, and mobile hydraulic systems. The sensor operates under flow conditions up to 0.1 m/s and is rated for continuous exposure to process fluids at temperatures from 0 °C to 100 °C and pressures up to 10 bar. Its compact G3/4″ threaded interface and IP65-rated housing enable straightforward integration into existing piping infrastructure without requiring bypass loops or sample conditioning.
Key Features
- Piezoelectric resonant sensing platform delivering simultaneous, co-located measurement of density, viscosity, and temperature
- No moving parts or wear components—designed for >10-year operational lifetime with zero scheduled maintenance
- Vibration-immune design validated per IEC 60068-2-6 for operation in high-acceleration environments (e.g., engine bays, marine propulsion systems)
- Chemical resistance achieved through 316 stainless steel or Hastelloy C-276 wetted surfaces and FKM elastomer seals compatible with hydrocarbons, esters, glycols, and polar solvents
- High-resolution digital output via RS485 MODBUS RTU protocol (slave ID configurable), supporting seamless integration with PLCs, SCADA, and DCS platforms
- Factory-calibrated traceability to national metrology standards, with full verification report provided per unit
- Low-power consumption (<20 mA @ 24 VDC) enabling deployment in energy-constrained or intrinsically safe zones when paired with appropriate power supplies
Sample Compatibility & Compliance
The FHV-3 is validated for use with Newtonian and mildly non-Newtonian liquids across petroleum, lubrication, and chemical processing applications. Compatible media include mineral and synthetic lubricants (ISO VG 10–680), hydraulic fluids (HLP, HVLP, HFD-U), aviation turbine fuels (Jet A-1, JP-5), diesel and gasoline blends, biodiesel (B100), ethanol/water mixtures, food-grade oils, and laboratory-grade solvents (toluene, acetone, methanol). It is not intended for slurries, abrasive suspensions, or highly aerated fluids. Regulatory compliance includes CE marking under the EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU; electromagnetic compatibility conforms to EN 61326-1 (industrial environments) and EN 61326-2-3 (test and measurement equipment), as well as ICES-003 Class B for Canadian markets. The sensor meets ASTM D1657 for density determination of petroleum products and supports GLP/GMP-aligned process validation when deployed with audit-trail-capable SCADA systems.
Software & Data Management
The FHV-3 communicates exclusively via MODBUS RTU over RS485, supporting standard function codes (03h, 04h, 06h, 10h) for reading holding registers (density, viscosity, temperature, dielectric constant, status flags) and writing configuration parameters (baud rate, slave ID, damping filter time constant). No proprietary software is required; integration is supported by industry-standard tools including Ignition SCADA, Siemens SIMATIC WinCC, Rockwell FactoryTalk, and open-source platforms such as Node-RED and Python-based pymodbus. All measurements are timestamped at the sensor firmware level upon acquisition. For laboratory offline analysis, optional benchtop mounting kits—including temperature-stabilized flow cells and calibrated reference fluid sets—are available to support method validation per ISO/IEC 17025 requirements.
Applications
- Fuel quality assurance during storage, transfer, and blending in terminal and refinery operations
- Real-time monitoring of lube oil degradation in gas turbines, steam turbines, and large reciprocating engines
- In-process control of hydraulic fluid condition in wind turbine pitch/yaw systems and offshore drilling rigs
- Continuous verification of coolant concentration and contamination in closed-loop thermal management systems
- Batch consistency verification in coatings, inks, and adhesives manufacturing
- On-site verification of biofuel blend ratios (e.g., B5–B20) prior to distribution
- Process analytical technology (PAT) implementation for FDA 21 CFR Part 11-compliant pharmaceutical excipient handling lines
FAQ
Can the FHV-3 measure non-Newtonian fluids accurately?
Yes—within defined shear-rate limits. The sensor reports apparent viscosity at the effective shear rate induced by the resonant element’s surface velocity (~10²–10³ s⁻¹). For strongly shear-thinning or thixotropic fluids, correlation to rotational viscometry requires empirical mapping under representative process conditions.
Is calibration required after installation?
No routine recalibration is needed. The sensor ships with NIST-traceable calibration certificates. Field verification using certified reference fluids (e.g., Cannon-Manning silicone oils, D2000 water-glycerol standards) is recommended annually or after mechanical shock events.
Does the sensor support hazardous area certifications?
The base model is not ATEX or IECEx certified. However, explosion-proof enclosures and intrinsically safe barriers compatible with RS485 signaling are available as system-level integration options—contact technical support for zone-specific documentation.
What is the minimum fluid conductivity required?
The FHV-3 does not require electrical conductivity. It functions reliably with deionized water, hydrocarbon fuels, and low-dielectric solvents (εᵣ ≥ 2.0), as measurement relies on mechanical resonance—not capacitive or conductive coupling.
Can dielectric constant be used for component concentration estimation?
Yes—when combined with density and temperature, dielectric constant enables multi-variate regression models for binary or ternary mixture composition (e.g., ethanol-in-gasoline, water-in-oil emulsion quantification), subject to proper training with representative calibration standards.
