SPX504 Series | Online Tuning Fork Density & Concentration Meter
The SPX504 Series is a high-performance, vibration-based transmitter designed for continuous, real-time measurement of liquid density and concentration. Its “Plug and Play” design eliminates the need for manual laboratory sampling, providing instant data for automated process control.
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Precision: Accuracy up to ±0.001 g/cm³.
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Versatility: Measures density, concentration (%), Brix, and specific gravity.
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Durability: No moving parts; available with PTFE coating or Tantalum for corrosive media.
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Connectivity: 4-20mA, RS485 Modbus, and HART protocol.
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Swiss-Ready: ATEX/Explosion-proof certified for hazardous environments.
Description
The SPX504 uses the principle of Tuning Fork Resonance. When the sensor is immersed in a liquid, the change in vibration frequency is directly proportional to the density. This “Online” approach allows for zero-pressure loss in your pipeline and maintenance-free operation in both open and closed tanks.
Specialized Versions for Your Industry
Instead of browsing multiple models, the SPX504 Series is configurable for your specific environment:
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The Pharma & Food Edition: Features a Hygienic Chuck (Tri-Clamp) connection and electrolytic polishing to meet strict sanitary standards.
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The Chemical & Anti-Corrosion Edition: Wetted parts available in Hastelloy C, Titanium, or PTFE/PFA coating to handle sulfuric acid, hydrochloric acid, and caustic soda.
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The Distillery & Beverage Edition: Pre-configured for high-accuracy Alcohol Concentration or sugar content (Brix) monitoring.
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The Industrial Tank Edition: Available with long-rod insertions (up to 2m) for deep tanks and reservoirs.
Additional information
| Mounting Type | Threaded (G1.5), Flange (DN50), Hygienic Chuck (Tri-Clamp) |
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Features
Core Performance
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Plug-and-Play Integration: Fully integrated “maintenance-free” digital measurement, designed for immediate use upon installation.
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High-Speed Processing: Equipped with an industrial-grade high-performance micro-controller for fast response times and superior stability.
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Built-in Temperature Compensation: Internal PT100 sensor automatically corrects for thermal drift between -50°C and +200°C.
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Anti-Jamming Technology: Isolation circuit design provides high resistance to electrical interference and physical impact.
Mechanical & Material Excellence
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No Moving Parts: The vibrating fork principle eliminates mechanical wear, significantly extending the sensor’s lifespan compared to traditional methods.
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Advanced Material Options: Choice of 316L Stainless Steel, Hastelloy C, Titanium, or Ceramic wetted parts.
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Protective Coatings: Available with PTFE or PFA coatings for extreme resistance to aggressive acids and bases.
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Rugged Housing: IP67-rated aluminium alloy casing, suitable for harsh outdoor and industrial environments.
Safety & Connectivity
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Hazardous Area Ready: Available with ATEX/Explosion-proof certification for use in volatile environments (Petrochemical/Chemical).
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Flexible Signal Output: Supports standard 4-20mA, RS485 Modbus RTU, and HART protocols for seamless connection to PLC and SCADA systems.
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Galvanic Isolation: Photoelectric compartment design ensures the sensor signal is protected from power supply fluctuations.
Specification
| Feature | Specification |
| Measuring Range | 0.5–2.5 g/cm³ (Customizable up to 5 g/cm³) |
| Accuracy | ±0.001 g/cm³ (Standard) / ±0.5% for Concentration |
| Repeatability | ±0.0001 g/cm³ |
| Process Temperature | -50°C to +150°C (Customizable up to +200°C) |
| Max Operating Pressure | 4.0 MPa (Standard) / Up to 20 MPa (Custom) |
| Fluid Viscosity | 0–2000 cP (depending on installation) |
| Wetted Materials | 316L, Hastelloy, Titanium, Ceramic, Tantalum |
| Signal Output | 4-20mA (4-wire), RS485 Modbus, HART |
| Protection Level | IP67 / ATEX Explosion-proof |
FAQ
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Does the sensor require frequent calibration? No. The SPX504 is designed for “Plug and Play” operation. Once calibrated for your medium, it remains stable thanks to its vibration-frequency logic.
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Can it handle liquids with particles? Yes, it is highly effective in desulfurization (lime slurry) and wastewater treatment where particles are present, provided the viscosity is within range.
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Is it compatible with my existing PLC? Yes. With standard 4-20mA and RS485 Modbus RTU, it integrates seamlessly into Siemens, Rockwell, and other industrial control systems.
