Ultrasonic · PS7020

Sound Velocity Concentration Meter

Sound Velocity Method · Liquid-Phase Composition Analysis

The PS7020 series ultrasonic sound-velocity concentration/density meter measures the time of flight of ultrasonic waves in a liquid, and—combined with temperature compensation and an extensive library of calibration curves—converts this data in real time to yield the medium’s concentration and density, addressing the low accuracy and susceptibility to interference inherent in conventional measurement methods. Leveraging the fundamental physical principles of the sound-velocity method, this instrument is entirely immune to the effects of liquid color, transparency, electrical conductivity, vibration, noise, and flow velocity, thereby guaranteeing high precision and exceptional stability.

Sound Velocity Concentration Meter

PISONICS  |  Xi’an Pisonics

PS7020 Series

Ultrasonic Sound‑Velocity Concentration/Density Meter

Concentration by Sound Velocity · ±0.0005 g/cm³ High‑Precision Measurement · Unaffected by Color, Bubbles, or Vibration

±0.0005 g/cm³

density measurement accuracy

0.5 ‰

concentration measurement accuracy

0.01 m/s

sound velocity measurement accuracy

Product Overview  Product Overview

PS7020 Series Ultrasonic Sound‑Velocity Concentration/Density Meter is a new-generation ultrasonic concentration and density instrument launched by Xi’an Pisonics Information Technology Co., Ltd. (PISONICS) for high‑precision process control applications in industries such as chemicals, petrochemicals, brewing, food and beverage, and mechanical manufacturing.

The instrument calculates the sound velocity by measuring the time it takes for an ultrasonic wave to propagate through a liquid, then uses temperature compensation and an extensive library of calibration curves to determine the medium’s concentration and density in real time. Leveraging the physical principles of the sound‑velocity method, the PS7020 is completely immune to interference from liquid color, transparency, electrical conductivity, vibration, noise, and flow rate, and incorporates proprietary high‑frequency acoustic technology to deliver stable performance even in bubbly conditions. With accuracy rated at ±0.0005 g/cm³/0.5‰, the PS7020 has become the preferred choice for many chemical, brewing, and precision‑process customers, replacing traditional manual testing, refractometers, and tuning‑fork instruments.

Measurement Principle  How It Works

At a constant temperature, the speed of an ultrasonic wave in a liquid corresponds one‑to‑one with the liquid’s concentration (or density). This forms the simplest and most reliable physical basis for sound‑velocity measurement.

The PS7020 sensor features a built‑in transmitter and receiver with a fixed spacing. The transmitter emits ultrasonic pulses at a specific frequency, the receiver records the arrival time of each pulse, and the host unit computes the sound velocity accordingly. Meanwhile, a temperature sensor measures the medium’s temperature with 0.01°C accuracy, and the host calls upon its internal three‑dimensional concentration‑sound velocity‑temperature calibration curves to calculate the current concentration and density of the liquid.

Concentration–Sound Velocity Relationship Curve  Concentration vs Sound Velocity

Within a given concentration range, the speed of an ultrasonic wave in a medium is a function of both concentration and temperature. The chart below illustrates the relationship between concentration and sound velocity at different temperatures—under the same conditions, higher concentrations generally correspond to faster sound velocities (though some media behave oppositely, the monotonic correlation still holds); at the same concentration, varying temperatures result in different sound velocities. The PS7020’s extensive library of calibration curves and temperature‑compensation algorithms ensure measurement accuracy and stability across all operating conditions.

Core Technical Advantages  Core Advantages

No.

Key Technologies / Features

Customer Value

 

1

Sound Velocity Measurement Principle

By measuring the ultrasonic wave’s travel time in the liquid to calculate the sound velocity, which is then converted into concentration, the physical principle is clear and the underlying mechanism is reliable

2

Ultimate Measurement Accuracy

Density accuracy reaches ±0.0005 g/cm³, and concentration accuracy is 0.5‰, far surpassing conventional ultrasonic density meters

3

Immune multi-interference

Unaffected by the medium’s color, transparency, conductivity, vibration, noise, or flow velocity; Pisonics’ proprietary high-frequency technology can even handle highly bubbly process conditions.

4

Simultaneous output of three parameters

Concentration, sound velocity, and temperature can be output simultaneously, facilitating multidimensional process monitoring and diagnostics

5

No consumables · No moving parts

The sensor features a solid-state design, with no mechanical wear and no need for frequent component replacements, ensuring long-term stability without degradation.

6

Three Installation Methods

Flanged / Clamp-type quick-connect / Insertion types available; the clamp-type quick-connect is particularly well-suited for hygienic processes in food and beverage brewing

7

Wide-range operational adaptability

Standard medium temperature: −20°C to +120°C; custom options extend up to 200°C. Standard pressure rating: ≤ 2.0 MPa; custom options reach PN250 / 500 Bar.

8

Extensive Sensor Options

Materials include stainless steel, Hastelloy, Nickel 200, Monel, titanium, tantalum, and PFA/ETFE/Halar-lined options, with lengths ranging from 92 mm to 3,000 mm

9

Rich communication interfaces

Full-stack support for RS485 / Modbus / Profibus-DP / Hart / dual-channel 4–20 mA / relays / Bluetooth 5.3

10

Self-Diagnosis of Faults

Supports water-level inspection and automatic anomaly diagnosis, facilitating rapid troubleshooting

11

Massive Data Storage

Cyclic storage of 10,000 historical records; no data loss upon power failure

12

Explosion-proof / CE certified

Optional ExdⅡCT6Gb explosion-proof model, certified by the EU CE

PS7000 Series: Principle Comparison & Selection Guide  Choose the Right Series

Pisonics’ PS7000 Series offers four ultrasonic measurement principles—acoustic impedance, acoustic attenuation, sound velocity, and sonar frequency modulation—to suit diverse application scenarios. Among these:

Comparison Dimensions

PS7000 acoustic impedance

PS7010 Acoustic Attenuation

PS7020 Sound Velocity Method

 

Core Physical Quantities

Reflected echo acoustic impedance

Penetration energy attenuation

Propagation time → sound velocity

Probe Configuration

1 unit (self-transmitting and self-receiving)

2 units (one transmitter and one receiver)

1 set (including transmitter/receiver)

Main Measured Object

Solid-containing two-phase slurry

Slurry / Solution

Clean, homogeneous liquids

Measurement Accuracy

±1% FS

±1% FS

±0.0005 g/cm³ / 0.5‰

Exclusive Advantages

Resistant to bubbles and severe abrasion

External mounting—no need to drill holes or use open flames

High precision, resistant to multiple types of interference, sanitary clamp-type quick connector

Typical Industries

Mining, thermal power, and coal

Renovation projects, explosion-proof areas

Chemical industry, brewing, food processing, machinery

✦ Selection Advice: If your process medium is a clean, homogeneous liquid (chemical solutions, syrups, alcoholic beverages, cleaning fluids, electrolytes, etc.) and you demand stringent accuracy, the PS7020 is the top choice; for solid–liquid two‑phase slurries, prioritize the PS7000; and for retrofitting aging pipelines or non‑intrusive installation in explosion‑proof zones, opt for the PS7010.

Typical Application Scenarios  Typical Applications

  • Chemicals and Petrochemicals—concentration monitoring in wet sulfuric acid processes, AD‑BLUE/urea/formaldehyde synthesis, chlor‑alkali brine purification, titanium dioxide post‑processing, solvent recovery (distillation), phase‑interface detection, gas scrubber monitoring, phosgene washing, caprolactam processing
  • Brewing, Food, and Beverage—wort concentration (filtration tanks/wort filters/boiling kettles), intelligent blending, automated distillation cutoff, wine extract and alcohol content, Brix sugar content (beverages/juices), dry matter monitoring in dairy products, CIP process identification, coffee/tea extract levels
  • Machinery and Surface Treatment—PCB cleaning fluid concentration, texture tank/etching tank concentration control, coolant/cutting fluid/antifreeze concentration, emulsion monitoring, quenching/anti‑corrosion fluid concentration, fuel additive testing
  • Other High‑Value Applications—crystallization process monitoring, pickling tank/alkali solution concentration measurement, KOH monitoring in electrolysis cells, copper ore H₂SO₄ measurement, potassium chloride flotation, aircraft deicing fluid, carbon capture processes, thermal dissolution processes

Three Installation Methods to Adapt to Diverse Processes  Installation Options

  • Flanged Installation: Standard DIN/ANSI flange connections, DN25/DN50 options for horizontal or vertical mounting, ideal for mainstream chemical pipelines.
  • Quick‑Connect Clamp: 3A/SMS/DIN sanitary clamp interfaces, tool‑free assembly and disassembly, compliant with CIP/SIP cleaning standards in the food, brewing, and pharmaceutical industries.
  • Insertion Type (Clamp Lock): Inserted into pipes or tanks via a pressure‑resistant seat, suitable for large‑diameter pipelines, online tank monitoring, and on‑site retrofit projects.

Technical Parameters at a Glance  Technical Specifications

Item

Specifications

 

Product Model

PS7020 Series (Sound Velocity Method Series)

Measurement Principle

Ultrasonic sound-velocity method (calculating the sound velocity from the ultrasonic propagation time → converting to concentration / density)

Measured Object

Chemical solutions, brewing liquids, beverages, cleaning fluids, and other clean, homogeneous liquids

Output Parameters

Concentration / Density / Sound Velocity / Temperature (output simultaneously)

Concentration Dimension

Supports mass concentration (%), volume concentration (%), °Brix, solids content, dry matter, and more

Density Accuracy

±0.0005 g/cm³ / ±0.001 g/cm³ / ±0.005 g/cm³ (depending on the customized accuracy grade)

Concentration Accuracy

0.5‰ / 1‰ / 5‰ (depending on the customization level)

Sound Velocity Range

100 ~ 4000 m/s

Sound Velocity Accuracy

0.01 m/s

Temperature Accuracy

0.01 ℃

Medium Temperature

Standard configuration: -20°C to +80°C; high-temperature version: -20°C to +120°C; custom options available up to 150°C / 180°C / 200°C

Ambient Temperature

-40℃ ~ +80℃

Relative Humidity

0 ~ 98% (no condensation)

Operating Pressure

Standard configuration ≤ 2.0 MPa; custom options include PN16 / PN40 / PN64 / PN100 / PN250

Sensor Material

Stainless steel / Hastelloy / Nickel 200 / Monel 400 / Zirconium 702 / Titanium / Palladium / Tantalum / PFA / ETFE / Halar-lined, etc.

Sensor length

92 / 150 / 250 / 500 / 1000 / 1500 / 2000 / 2500 / 3000 mm optional

Process Connection

DIN flange / ANSI flange / Clamp coupling / Threaded / Varivant / Customer customization

Installation Method

Flanged / Clamp-type quick-connect / Insertion (clamp-lock)

Power Supply

DC 24V or AC 220V, four-wire or two-wire options available

Analog Output

4–20 mA × 2 channels (dual-channel)

Digital Communication

RS485 / Modbus / Profibus-DP / Hart / Bluetooth 5.3 / Relay output

Data Storage

Cyclic storage of 10,000 historical records

Display and Control

Local OLED + Remote Display + Infrared Remote Control

Protection Level

IP65

Explosion-proof rating

ExdⅡCT6Gb (optional)

Certification

Certified by the EU CE

Fault Diagnosis

Supports water-level inspection and self-diagnosis of abnormalities

Precision Beyond Limits

※ For special measurement ranges, high‑temperature/high‑pressure customization, sensors made from special materials, or detailed selection guidance, please contact Pisonics’ technical engineers in Xi’an.

Precision beyond limits

For non-standard ranges, special wetted parts, or hazardous-area variants — talk to a Pisonics engineer.

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