SPX510 Series | Intelligent Differential Pressure Online Densitometer
The SPX510 Series is the industrial gold standard for density measurement in large tanks, slurries, and high-viscosity liquids. Using advanced differential pressure technology with integrated temperature compensation, it provides a rugged, “set-and-forget” solution for environments where other sensors fail.
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Dual-Parameter Display: Real-time LCD showing both density and temperature.
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Versatile Mounting: Available in Side-mount, In-line, Elbow, and Rod configurations.
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Material Excellence: Diaphragms available in 316L, Hastelloy C, Tantalum, or Titanium.
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Smart Calibration: Full HART Protocol support for remote monitoring and recalibration.
Description
The SPX510 Series is engineered for continuous, online measurement of liquid density and concentration in the most demanding industrial environments. Unlike ultrasonic or tuning fork sensors that can struggle with high solids or extreme viscosity, the SPX510 utilizes the proven principle of Differential Pressure (DP). By measuring the pressure exerted by a liquid column at two fixed points, it calculates density with clinical precision, unaffected by flow turbulence or suspended particles.
Why Choose the SPX510?
1. Built for “Difficult” Media
Whether you are dealing with thick lime slurry in desulfurization, heavy-media coal washing, or viscous chemical resins, the SPX510 remains accurate. The flat-diaphragm design prevents material buildup, ensuring that even “sticky” or abrasive liquids don’t interfere with the reading.
2. A Safer Alternative to Radioactive Sources
In many industries, radioactive isotope meters were once the only option for large tanks. The SPX510 provides a modern, non-nuclear alternative. This eliminates the need for strict government approvals, specialized radiation safety officers, and the high costs associated with hazardous waste disposal.
3. Advanced Dual-LCD Intelligence
Efficiency is built into the hardware. The integrated transmitter features a dual-four-digit LCD screen that displays Density and Temperature simultaneously. With built-in temperature compensation, the device automatically corrects for thermal expansion, providing a standardized density reading regardless of process fluctuations.
Versatile Installation Configurations
The SPX510 Series is available in multiple form factors to fit your existing infrastructure:
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Side-Mounted / Tank Type: Perfect for large storage tanks and reservoirs.
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In-Line / Pipe Type: Designed for vertical pipeline installation to monitor flow density without process interruption.
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Elbow Type: Specialized for installation at pipe bends where space is limited.
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Rod Type: Ideal for open pits or tanks where side-wall entry is not an option.
Key Industrial Applications
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Chemical & Petrochemical: Monitoring acid/alkali concentrations, urea, and polymers.
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Food & Beverage: Real-time Brix (sugar) monitoring in syrups, juices, and dairy processing.
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Mining & Mineral Processing: Tailings, thickener underflow, and lime milk density.
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Environmental Technology: Flue gas desulfurization (FGD) and wastewater sludge monitoring.
The DP Principle
The sensor functions as a two-wire transmitter. It utilizes a capacitive differential pressure sensor coupled with high-sensitivity pressure repeaters. As the density of the medium changes, the pressure exerted on the submerged diaphragms shifts proportionally. The intelligent electronics convert this physical change into a precise 4-20mA signal or digital HART protocol output for your PLC/SCADA system.
Features
Core Technical Features
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Integrated Dual-Parameter Display: High-contrast dual LCD screens simultaneously display real-time Density and Temperature, allowing for immediate on-site verification.
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Maintenance-Free Design: A two-wire transmitter with a solid-state integrated structure. No moving parts means no mechanical wear and significantly reduced operational costs.
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High-Precision Pressure Repeaters: Utilizes advanced capacitive differential pressure sensors for a standard accuracy of ±0.001 g/cm³.
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Automatic Temperature Compensation: Built-in sensors automatically correct for liquid thermal expansion between 0°C and 300°C (depending on configuration).
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“Set-and-Forget” Installation: Factory-calibrated for rapid deployment. Simply install the sensor into the medium for immediate digital readings.
Robustness & Compatibility
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Extreme Media Handling: Specifically designed for “difficult” fluids, including high-viscosity resins, abrasive slurries, and liquids with suspended solids.
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Non-Nuclear Solution: A 100% safe, non-radioactive alternative to isotope density meters. Eliminates the need for regulatory approvals, specialized safety officers, and hazardous disposal.
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Superior Material Choice: Diaphragms available in 316L Stainless Steel, Hastelloy C, Tantalum, or Titanium to withstand the most aggressive chemical environments.
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Industrial Protection: Rated IP65 (dust-tight and water-jet resistant) with a rugged polyurethane-coated aluminum alloy housing.
Connectivity & Integration
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Standard Signal Output: 4-20mA DC (2-wire system) for seamless integration with existing PLC and SCADA systems.
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HART Protocol Support: Full digital communication for remote calibration, damping adjustment (0–32s), and diagnostics.
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Flexible Mounting Options: Available in Side-mount, In-line, Elbow, Pipe, and Rod-type configurations to fit any tank or piping geometry.
Specification
Performance & Measurement
| Parameter | Specification |
| Density Range | 0 ~ 3 g/cm³ (Standard) / Up to 5 g/cm³ (Optional) |
| Accuracy | ±0.001 g/cm³ (Reference accuracy ±0.05% FS) |
| Resolution | 0.001 g/cm³ (Standard) / 0.0005 g/cm³ (High-res) |
| Stability | ±0.25% FS over 60 months |
| Damping Adjustment | 0 – 32 seconds (Configurable) |
Electrical & Communication
| Parameter | Specification |
| Output Signal | Analog 4–20mA (2-wire) + Digital HART Protocol |
| Power Supply | 12 ~ 45 VDC (24 VDC Recommended) |
| Display | Dual-line LCD (4.5 or 5 digits) for Density & Temp |
| Load Resistance | 250 ~ 600 Ω (for HART communication) |
| Electrical Interface | M20 x 1.5 or 1/2-14 NPT |
Environmental & Process Limits
| Parameter | Specification |
| Process Temperature | Standard: 0–100°C / High-Temp Option: up to 300°C |
| Ambient Temperature | -30°C to +150°C (Digital display limit: -10°C to +60°C) |
| Max Working Pressure | 4.0 MPa (Customizable up to 20 MPa) |
| Static Pressure Effect | ±0.25% FS / 6 MPa |
| Protection Grade | IP65 (Dust-tight and water-jet resistant) |
Mechanical & Materials
| Parameter | Specification |
| Wetted Diaphragm | 316L, Hastelloy C-276, Titanium, Tantalum |
| Diaphragm Coating | Optional Spray-on PTFE/Teflon for acid resistance |
| Housing Material | Low-copper Aluminum Alloy (Polyurethane coated) |
| Fill Fluid | Silicone Oil (Standard), Olive Oil (Food Grade), Fluorine Oil |
| Process Connections | Flange (ANSI 150/300, DN50/80/100) or Tri-Clamp |
FAQ
1. Why choose Differential Pressure (DP) over a Tuning Fork sensor?
While tuning forks (like our SPX504) are excellent for clean liquids, the SPX510 (DP) is superior for “dirty” media. If your liquid contains high solids, fibers, or is extremely viscous (like heavy sludge or resins), the DP method is more reliable because it has no vibrating parts that can be “dampened” or clogged by the medium.
2. Can the SPX510 replace a radioactive (isotope) density meter?
Yes. This is one of its primary advantages. It provides an accurate, non-nuclear alternative for large tanks and pipes. You eliminate the cost of government permits, specialized safety officers, and the complex disposal of radioactive sources.
3. Does the flow rate of the liquid affect the accuracy?
In a perfectly static tank, accuracy is at its highest. In flowing pipes, high turbulence can affect the pressure reading. For high-flow applications, we recommend a bypass installation or using a measuring tank to ensure the liquid is stable at the point of measurement.
4. Is the sensor resistant to aggressive chemicals?
Absolutely. We offer diaphragms in Tantalum, Hastelloy C, and Titanium, as well as PTFE (Teflon) coatings. This allows the SPX510 to monitor density in highly corrosive environments like sulfuric acid, nitric acid, and lime slurry.
5. How often does the unit need to be recalibrated?
The SPX510 is designed for long-term stability (±0.25% over 60 months). However, in abrasive environments, we recommend a yearly check. The integrated HART protocol allows for easy recalibration and zero-point adjustment without removing the device from the process.
6. What is the “Dual-LCD” display used for?
Unlike standard transmitters that only show density, the SPX510 shows Density and Temperature simultaneously. This is crucial because density changes with temperature. The display confirms that the internal temperature compensation is working correctly in real-time.
