PISONICS | Xi’an Pisonics
PS7000 Series
Ultrasonic Acoustic-Impedance Slurry Density Meter
Say goodbye to nuclear-source hazards—redefining online slurry density measurement
Product Overview Product Overview
PS7000 Series Ultrasonic Acoustic-Impedance Slurry Density Meter is a next-generation, non-nuclear-source online slurry density monitoring instrument independently developed by Xi’an Pisonics Information Technology Co., Ltd. (PISONICS). It completely eliminates the radiation safety risks and cumbersome environmental‑approval and maintenance costs associated with traditional γ‑ray density meters, and is specifically designed for precise slurry density control in industries such as nonferrous metals, thermal power generation, coal washing, chemical metallurgy, and potash‑salt processing.
The instrument features an innovative linear-frequency-modulation (Chirp) acoustic‑impedance analysis algorithm, which overcomes the measurement blind spots of conventional reflective ultrasonic instruments in complex operating conditions involving bubbles, strong corrosion, and high abrasiveness. Within the full range of 0–80% mass concentration (0–3,000 kg/m³), it delivers continuous, high‑precision measurements with an accuracy of ±1% FS. It has been deployed in numerous thermal power plants, mines, and salt‑processing enterprises, demonstrating stable, “zero‑maintenance” operation for several years, providing reliable data support for process stability and quality improvement.
Measurement Principle How It Works
The acoustic‑impedance method is based on a fundamental physical phenomenon: when an ultrasonic wave propagates through a medium and encounters a solid‑liquid interface, the intensity of the reflected signal is determined by the difference in “acoustic impedance” across the interface. Acoustic impedance Z equals medium density ρ multiply sound velocity c, which is directly related to slurry density.
The PS7000 employs a single‑probe, self‑transmit‑and‑receive design: the probe continuously emits linear‑frequency‑modulated (Chirp) ultrasonic pulses into the pipeline and acquires the reflected signals in real time. The broadband characteristics of the Chirp signal enable it to penetrate bubble layers and eliminate multiple‑reflection interference; the host unit analyzes the acoustic‑impedance features of the echo via its algorithm, accurately reconstructing the slurry’s true density.
→ The higher the slurry density, the greater the acoustic impedance, the more pronounced the echo signal features, and the more precise the density reading.
Core Technical Advantages Core Advantages
No. | Key Technologies / Features | Customer Value |
1 | Chirp acoustic impedance algorithm | Penetrates the bubble layer and eliminates multiple-reflection interference, accurately restoring the true density of the solid–liquid two-phase system |
2 | Non-nuclear source, zero radiation | Completely bid farewell to the radiation risks and environmental‑approval hassles of gamma‑ray density meters—safe and worry‑free |
3 | Non-contact probe design | Zero wear, zero blockage, maintenance-free; probe service life ≥ 5 years |
4 | Customized Wear-Resistant Probe | 316L / 2205 duplex stainless steel + special ceramic composite, with a surface roughness of Ra ≤ 0.4 μm, ensuring smoothness and anti-scaling performance |
5 | Direct insertion installation with pipeline flanges | The straight‑run pipe section requires only 5D+2D, with no full‑pipe requirement; even small volumes of slurry can be measured with high precision |
6 | Multiple linings available | PTFE, rubber, and ceramics are optional, ensuring reliable performance in highly acidic, highly alkaline, and highly abrasive conditions |
7 | Integrated/Split flexible installation | Supports wall-mounted, panel-mounted, and pipeline installation; the split-type signal can be transmitted up to 500 meters. |
8 | Chinese–English bilingual OLED interaction | Graphical menu prompts ensure intuitive operation; you can get started in just 3 minutes |
9 | Dual-mode signal output | 4–20 mA (dual-channel) + MODBUS-RTU (RS485), seamlessly integrated with PLC/DCS |
10 | Supports 4G remote transmission | Optional wireless module for real-time data visualization in the cloud, enabling more convenient remote operations and maintenance |
11 | Massive Data Storage | Cyclic storage of 20,000 real-time data points plus 400 log entries; no data loss in the event of a power outage |
12 | Explosion-proof / CE-certified | Optional ExdⅡCT6Gb explosion-proof model, certified by the EU CE |
Comparison with Traditional Solutions Why PS7000
Addressing the pain points of slurry density measurement—nuclear‑radiation regulatory risks, signal loss due to bubbles, short probe life from severe abrasion, and frequent fouling driving up maintenance costs—the PS7000,凭借 its non‑nuclear acoustic‑impedance principle and custom‑designed probe, achieves comprehensive superiority in three key areas: safety, anti‑interference capability, and maintenance cost:
Comparison Dimensions | Nuclear (γ-ray) density meter | Tuning fork / Differential pressure density meter | PS7000 acoustic impedance |
Safety | Radiation is present; environmental approval is required | Safety | Safe, radiation-free, and approval-free |
Bubble/Precipitation Interference | Significantly affected | Significantly affected | Chirp Algorithm for Interference Suppression |
Wear and Fouling | Sensor is prone to wear | Prone to scaling, requires frequent maintenance | Non-contact, zero wear |
Maintenance Costs | High (requires nuclear source replacement) | Moderate (frequent cleaning) | Extremely low (virtually maintenance-free) |
Total Life-Cycle Cost | High | Moderately high | Significantly Better |
Typical Application Scenarios Typical Applications
- Nonferrous Metallurgy — feed/slurry discharge concentration control in ore‑dressing plants, flotation process concentration monitoring, and slurry density measurement at the underflow of thickeners and the outlets of hydrocyclones
- Thermal Power Generation — limestone slurry preparation, flue‑gas desulfurization (FGD) slurry concentration monitoring, and circulating slurry density adjustment
- Coal Washing — heavy‑media suspension density control, and concentration monitoring during the separation of clean coal, middlings, and tailings
- Steel Metallurgy — limestone slurry desulfurization density measurement in steel plants, and converter dust‑collection slurry concentration monitoring
- Chemical & Potash Industries — brine concentration monitoring in salt lakes, saturated crystalline solution density control, and online measurement of solid‑liquid two‑phase flows
- Mine Tailings — tailings dam filling station outlet slurry density measurement, and grinding circuit density control
Typical Application Cases Application Cases
■ Case 1| A Thermal Power Plant in Inner Mongolia
The customer had previously used a tuning‑fork density meter and a double‑flange differential‑pressure density meter: the tuning‑fork type suffered from frequent data fluctuations due to the large volume of the pH tank and slurry settling; the differential‑pressure type exhibited significant measurement deviations caused by severe foaming in the upstream pipeline and sensor fouling. After switching to the PS7000, the issues of bubbling and fouling were completely resolved, the instrument requires virtually no maintenance, delivers stable accuracy, and fully meets the customer’s operational needs.
■ Case 2| A Potash Plant in Qinghai
Potash production relies heavily on salt‑lake resources, and the brines are characterized by high salinity, abundant suspended crystals, high viscosity, strong corrosiveness, and a tendency to foul—conditions that make it difficult for conventional density meters to operate reliably. In late October 2025, the PS7000 was installed in the plant’s blending tank, at a critical process step (potassium chloride nearing saturation, crystal content 30%–40%, temperature fluctuating between 5°C and 20°C). Two weeks of comparative testing showed that the PS7000’s readings consistently matched laboratory results within a deviation of only 0.5%–0.8%, even at peak concentrations, with no anomalies detected, fully validating its high precision and reliability under complex conditions.
■ Case 3| An Iron Ore Dressing Plant in Xinjiang
The customer had previously used a through‑beam density meter, but severe slurry bubbling frequently caused signal loss, jeopardizing production safety; after six months of operation, probe wear accelerated, leading to frequent failures. Since switching to the PS7000 series acoustic‑impedance density meter, both bubbling interference and probe wear have been completely eliminated, and the equipment has been running stably for over two years, achieving nearly “zero maintenance,” significantly enhancing system reliability and operational efficiency.
Technical Parameter Overview Technical Specifications
Item | Specifications |
Product Model | PS7000 Series (Acoustic Impedance Sequence) |
Measured Object | Solid–liquid two-phase slurries (such as slurry, ash slurry, coal slurry, limestone slurry, salt solutions, etc.) |
Measurement Range | 0 ~ 80% (mass concentration) / 0 ~ 3000 kg/m³ |
Measurement Accuracy | ±1% FS |
Resolution | 0.001 g/cm³ or 0.1% |
Power Supply | DC 24 V or AC 220 V ±20% (50/60 Hz), four-wire system |
Overall power consumption | ≤ 1W |
Ambient Temperature | -30℃ ~ +60℃ |
Medium Temperature | 0℃ ~ 80℃ (high-temperature models can reach 120℃) |
Ambient Humidity | ≤ 98%RH (no condensation) |
Applicable Pipe Diameter | DN50 ~ DN1000 (larger sizes can be customized) |
Installation Method | Flanged direct-insertion / welded / split-type (compatible with ANSI / DIN / JIS) |
Protection Level | Pipe section IP68 / Host IP65 |
Explosion-proof Rating | ExdⅡCT6Gb (optional) |
Display Screen | 128 × 64 dot-matrix OLED (Chinese/English bilingual, with optional remote display) |
Analog Output | 4–20 mA × 2 channels (load ≤ 500 Ω) |
Digital Communication | RS485 MODBUS-RTU (baud rate and parity bits are configurable) |
Remote Transmission | Supports a 4G wireless module (optional) |
Data Storage | Real-time recording of 20,000 records + daily recording of 400 records |
Certification | Certified by the EU CE |
External Dimensions | 288 × 190 × 95 mm (main unit) |
Host Weight | Approx. 2.5 kg |
Precision Beyond Limits
※ For customized nonstandard ranges, special linings, explosion‑proof models, or detailed selection guidance, please contact Pisonics’ technical engineers in Xi’an.