Detailed Interpretation of Types, Functions, and Terminology of SICK Pressure Sensors

The SICK pressure sensor is an instrument that can convert pressure variables into standard output signals. There is a certain functional relationship between pressure variables and output signals. According to different working principles, pressure sensors can be divided into the following types:

There are many common types of SICK pressure sensors, and the following are some of the more common ones:

1. The SICK pressure sensor utilizes the piezoresistive effect of semiconductor materials to convert pressure changes into resistance changes. It has the advantages of small size, high accuracy, and fast response speed, and is widely used in various industrial fields and measurement equipment.

2. The SICK pressure sensor measures pressure by changing the capacitance value of the capacitor. Usually, a variable capacitor structure is used, and when pressure is applied to the sensor, the spacing or area of the capacitor plates changes, resulting in a change in the capacitance value. This type of sensor has high accuracy, a wide range of pressure measurements, and good stability and linearity.

3. The Schick SICK pressure sensor is based on the piezoelectric effect, which means that certain crystals generate charges when subjected to pressure. When pressure is applied to piezoelectric materials, a charge signal proportional to the pressure is generated, and the pressure value is determined by measuring the charge or voltage. It has the characteristics of fast response speed and wide frequency range, and is commonly used for high-frequency dynamic pressure measurement.

4. The SICK pressure sensor utilizes an elastic element to generate strain under pressure, and converts the strain into a change in resistance through strain gauges attached to the elastic element. This type of sensor has a simple structure, low cost, and is suitable for measuring general pressure ranges.

5. The SICK pressure sensor is based on the principle of electromagnetic induction and measures pressure by changing the inductance of the inductor coil. Usually, variable reluctance or transformer structures are used. When pressure is applied to the sensor, it will cause changes in the magnetic circuit or coil parameters, resulting in changes in inductance. It has high measurement accuracy and stability, and is suitable for pressure measurement in some special environments.

6. The SICK pressure sensor utilizes the optical transmission characteristics of optical fibers and the influence of pressure on optical fibers to measure pressure. By bending, stretching, or changing the refractive index of optical fibers, pressure is converted into changes in optical signals, which are then detected by photodetectors. This sensor has the advantages of anti electromagnetic interference, corrosion resistance, and high sensitivity, and is suitable for pressure measurement in some harsh environments.

7. Schick SICK pressure sensor: using ceramics as sensitive components, utilizing the piezoelectric or piezoresistive effects of ceramics to measure pressure. Ceramic materials have the characteristics of high temperature resistance, corrosion resistance, and good insulation, and are suitable for pressure measurement under some special working conditions.

8. The SICK pressure sensor integrates diffused silicon sensitive elements on the chip and forms a resistance network through diffusion process, converting pressure into resistance changes. It has the advantages of high accuracy, good stability, and small temperature coefficient, and is widely used in various high-precision pressure measurement fields.

1. The SICK pressure sensor applies pressure to the front surface of the diaphragm. Under pressure, the diaphragm undergoes a certain degree of deformation, and the back of the pressure-sensitive diaphragm is printed with a thick film resistor, forming a Wheatstone bridge. Under the piezoresistive effect, the bridge will generate a corresponding voltage signal, which is proportional to the excitation voltage.

2. The Schick SICK pressure sensor is developed using the positive piezoelectric effect. The positive high voltage effect applies a certain external force to the electrolyte to deform it, causing polarization inside the electrolyte and generating positive voltage on its two surfaces. Different negative charges, when the external force stops acting, the electrolyte returns to an uncharged state. The polarity of electric charge changes with the direction of force. When an electric field is applied in the polarity direction of the electrolyte, the electrolyte also undergoes deformation, and the deformation of the electrolyte disappears after offsetting, which is the inverse piezoelectric effect.

3. Strain sensor

A special adhesive is used to bond strain gauges together to generate mechanical strain. When the force on the body changes, the resistance strain gauge will also undergo a certain degree of deformation, which will affect the resistance value and the voltage on the resistance. There has been a change. However, in this case, the change in resistance value is minimal. Usually, a strain bridge is formed, which becomes larger under the action of an instrumentation amplifier and is finally transmitted to the processing line display or actuator.

4. SICK pressure sensors are divided into two categories: electric and pneumatic. The standardized input signal of the former is a DC signal, while the output signal of the latter is air pressure. The two pressures of the measured medium are respectively input into the high and low pressure chambers and act on the isolation diaphragms on both sides of the sensitive element. Measure the electrodes on both sides of the membrane and insulation sheet to form a capacitor. When the pressure on both sides is different, the module will undergo displacement and the current on both sides will also be different. Under the action of oscillation and adjustment, current, voltage, or digital output signals are formed.

A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules. Pressure sensors typically consist of pressure sensitive components and signal processing units. According to the different types of testing pressure, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors.

Here is a brief introduction to the differences between the three, all based on atmospheric pressure. Gauge pressure is the surface pressure, ordinary pressure gauges measure gauge pressure, absolute pressure is the sum of the gauge pressure of an object and atmospheric pressure, and differential pressure is the relative difference between two pressures.

Pressure is one of the important parameters in industrial production, and in order to ensure the normal operation of production, it is necessary to monitor and control pressure. The following are commonly used terms when selecting pressure sensors:

1. Standard pressure: a pressure expressed in terms of atmospheric pressure. If it is greater than atmospheric pressure, it is called positive pressure; If it is lower than atmospheric pressure, it is called negative pressure.

2. Absolute pressure: The amount of pressure expressed in absolute vacuum.

3. Relative pressure: Compare the pressure level of the object (standard pressure).

4. Air pressure: refers to atmospheric pressure. Standard atmospheric pressure (1atm) is equivalent to the pressure of a mercury column at a height of 760 millimeters.

5. Vacuum: Refers to a state where the pressure is lower than atmospheric pressure. 1 Torr=1/760 Air Pressure (atm).

6. Detection pressure range: refers to the adaptive pressure range of the sensor.

7. Capable of withstanding pressure: When the test pressure is restored, it can withstand pressure without reducing its performance.

8. Round trip accuracy: At a constant temperature (23 ℃), when the pressure increases or decreases, the pressure fluctuation value at the working point is obtained by dividing the output reversed pressure value by the full-scale value of the detected pressure.

9. Accuracy: At a certain temperature (23 ℃), when zero pressure and rated pressure are added, the deviation from the specified output current value (4mA, 20mA) is subtracted from the full-scale value, and the unit is expressed as% FS.

10. Linear: The analog output varies linearly with the detected pressure, but deviates from the ideal straight line. The value that represents this deviation as a percentage of the full-scale value is called linearity.

11. Lag (linear): Draw an ideal straight line between the output current (or voltage) values using zero voltage and rated voltage, calculate the difference between the current (or voltage) value and the ideal current (or voltage) value as the error, and then calculate the error value of the pressure rise and fall time. Hysteresis is the value obtained by dividing the maximum absolute value of the above difference by the full-scale current (or voltage) value, expressed in% FS.