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What types of sensors are resistant in chemically demanding environments with acids and alkalis?

In this article, we examine types of sensors that are resistant for use in chemically demanding environments
What types of sensors are resistant in chemically demanding environments with acids and alkalis?

Ultrasonic sensors for wet-chemical processes.

Chemical environments can be devastating to most sensors. Acids and alkalis leave the average sensors corrode. How can accurate measurements under pressure be made in these? How can sensors and production processes be protected from this?

The advanced ultrasonic level measurement systems of the microsonic hps+ series operate without physical contact and are ideal for applications in wet chemical processes, especially in the food, electronics and PV industries.

Their exceptional resistance to high concentrations of acids and alkalis is due to the protective PTFE film over the ultrasonic diaphragm, resulting in reliable long-term performance. It is sealed with a special O-ring, made of FFKM, which is in contact with the housing made of stainless steel 1.4571 or PVDF. This achieves significant resistance to aggressive media.

Easy integration and high measurement accuracy

The integration of the microsonic hps+ is effortless and efficient thanks to the widespread G1", G2" and GF process connection widely used in industry. These sensors maintain a high degree of measurement accuracy even when used with fluids exhibiting varying densities. This makes the ultrasonic level measurement systems suitable for a wide range of applications, including metering applications.

Optimal installation and adjustment of measuring range

With the LinkControl it is easy it is to adjust the measurement range.

The LinkControl includes both the LinkControl adapter and the LinkControl software. This allows the hps+ sensors to be configured via a PC or laptop with all common Windows® system programs.

For measuring fill levels in storage tanks and containers with overpressure conditions

These ultra-resistant sensors can also be used for measurements in normal pressure conditions or in closed storage tanks and containers with a maximum internal pressure of 6 bar.

Sound spreads through the air. At lower air pressure, sound travels slower and over shorter distances. In a complete vacuum, no sound transmission even takes place. In an overpressure, where the hps+ shows its strength, sound actually spreads through the air faster and over greater distances. As a result, normal sensors, (if they survive the overpressure at all) transmit incorrect readings because their internal calculations are based on normal air pressure. The hps+ uses an internal calculation method that ensures that the measured distance is still accurate.

Modified filters also allow them to be used in conditions where containers are filled from above or where a stirring mechanism is present.

 A 1″ or 2″ threaded flange is used for pressure-tight installation in a tank, depending on the hps+ model.

Adjusting for limited installation space: the Pico+TF

The most suitable choice for installation, with limited installation space and the use of immersion tubes in containers with many built-in elements is the pico+TF series.

As with all sensors in the hps+ series, the measuring range can be easily and conveniently adjusted with the PC programming tool TouchControl.

The PTFE film on the ultrasonic membrane provides protection to the sensor against chemicals and cleaning agents. The sensor housing, M22 x 1.5, has a protective PVDF sleeve.

Essential Information HPS+ Ultrasonic Sensors

  • 2 pnp switching outputs 
  • 1 analog output plus 1 pnp switching output
  • 4 detection widths with a measurement range of 30 mm to 8 m.
  • Teach-in functionality via T1 or T2 keys.
  • Resolution ranges from 0.025 mm to 2.4 mm.
  • Temperature compensation implemented.
  • Operating voltage from 9-30 V.
  • LinkControl for setting up sensors with a PC.

Key Features HPS+ Ultasone Sensors

  • Universal application in acids and in alkaline processes thanks to high chemical resistance.
  • Use in both normal pressure and overpressure possible.
  • Protection against aggressive substances with a PTFE membrane.
  • Choice of stainless steel or PVDF housing for the hps+340, especially suitable for the food industry.
  • Seal against the housing with a FFKM O-ring for the highest degree of resistance to chemicals.
  • Digital display with direct measurement in mm/cm or %.
  • Possibility of numerical adjustment of the sensor via the digital display.

Essential Information Pico+ Ultrasonic Sensors

  • PTFE membrane made of a special polymer to protect against harmful substances
  •  M22 housing made of a specific polymer suitable for industrial applications
  • IO-link interface that meets the latest industry standards.
  • Automated synchronization and multiplex mode to enable simultaneous operation of up to ten sensors in confined spaces

Key Features Pico+ Ultasone Sensors

  • 1 Switching output with Push-Pull function, suitable for PNP or NPN switching.
  • An analog output with the choice of 4-20 mA or 0-10 V.
  • Available in 4 different detection widths, with measurement ranges from 20 mm to 1.3 m.
  • Microsonic Teach-in function via pin 5.
  • Accuracy of measurements ranges from 0.069 mm to 0.1 mm.
  • Built-in temperature compensation.
  • Can be powered with a voltage between 10 and 30 V. LinkControl to easily set the sensors with a computer.