To obtain data on temperature or atmospheric pressure, special piezoelectric type sensors are used. The main parameters of the devices include not only the operating frequency, but conductivity, as well as resistance. The standard modification consists of a membrane surrounded by quartz plates. The case is mainly made of metal discs. To connect to the measuring equipment, pins are used that are connected to the thrust bearing.
The principle of operation of the element
There are various piezoelectric sensors. The principle of operation of the elements is based on a change in the capacity of the membrane. Quartz plates in this case play the role of conductors. A shielded plate is used to convert the frequency of the models. The signal is transmitted to the membrane through the thrust bearing. The difference of discharges is recorded in measuring instruments. Through the findings on the sensors, data can be processed and stored.
Sensor Types
By purpose, sensors of force, pressure, vibration and acceleration are isolated. There are also modifications for measuring temperature. Another separation of modifications occurs in frequency. Models up to 3 Hz are compact in size. Modifications with high conductivity are able to work in conditions of high humidity.
Force sensors
Piezoelectric force sensors have recently been actively involved in laboratory research. They are characterized by increased accuracy and good conductivity. However, it is important to note that the operating frequency in this case is at 4 Hz.
Many modifications are made with conventional contact membranes. It is also worth noting that the stores feature wired devices with quartz plates. The conductivity of these sensors is approximately 5 microns. Many modifications are allowed to be applied in conditions of high humidity. The capacitance of the conductors in this case is 55 pF. There are no models for sensors of this type.
Pressure Sensors
Piezoelectric pressure sensors are produced with different types of membranes. If you believe the reviews of experts, then the most popular devices are considered contact elements, the conductivity index of them is 8 microns. In this case, the operating frequency reaches a maximum of 5 Hz. Contact membranes in sensors are quite rare. Quartz plates are installed through the findings. The average capacitance of conductors is 120 pF.
Compact modifications deserve special attention. As a rule, they are used shielded type. Sensors of this type are great for measuring equipment. Quite often they are connected to oscilloscopes. The thrust bearings of the modifications are of a transitional type. Some models are capable of boasting high accuracy measurements.
Features of temperature sensors
Piezoelectric temperature sensors operate on low-impedance modules. If you believe the reviews of experts, then the membrane is mainly used contact type, and adapters under them are used low conductivity. Quartz plates are able to work in conditions of high humidity. If we talk about the shortcomings, it is important to note that the models are produced mainly without glides. Instead, special insulation films are installed on the membranes. The dielectric constant lies in the region of 50%.
Acceleration sensors
A piezoelectric acceleration sensor is often used in industry. The findings of the models are connected through membranes. Some devices are manufactured specifically for drive units. The membranes in this case are installed contact type. It is also worth noting that the stores feature elements that work on polished plates.
The thrust bearings are mainly used in compact sizes. The insulation of the models is applied in high quality. Metal linings are quite rare. It should also be noted that there are devices that are capable of operating at a frequency of 3 Hz. The conductivity index in them, as a rule, does not exceed 44 microns. The capacitance of conductors for models of this type is in the region of 40 pF.
Elements of the VM-6360 series
The sensors of the presented series are capable of very quickly detecting the ambient temperature. According to experts, their conductivity is quite high. Among the shortcomings, it is worth noting the low resistance at the conclusions. Also, experts often point to a module that works at a frequency of 3 Hz. Thus, the measurement accuracy of the modification is not very high. In this case, only one membrane is used. The findings are connected to it through the thrust bearing. According to experts, the problems with modulation of this sensor are not terrible. Quartz plates are installed securely.
Features of Arduino sensors
Arduino is a piezoelectric vibration sensor that can operate in different climatic conditions. The element has only one membrane. In this case, the plates are installed with two linings. According to experts, their conductivity is quite high. The dielectric constant of the plates is 55 microns.
Many experts say that the sensor has a high accuracy of measurements. If we talk about the cons, then experts point to a low resistance parameter in the membrane. Due to this, there are problems with signal transmission. The charge leak to this sensor is not terrible. The operating frequency is maintained at 5 Hz.
Description of the elements of the Master 300 CT series
The specified piezoelectric sensor is necessary for accurate determination of pressure. The module in the system uses a wave type. Many experts say that the model can be used in an environment with a humidity of not more than 55%. The disk of the modification is used spherical type.
It is also worth noting that the maximum operating temperature of the element is 45 degrees. The thrust bearing is highly conductive. Moreover, he has certain problems with permeability. Connection to measuring instruments occurs through two outputs.
Elements of the Master 330 CT series
These are high-quality and high-precision piezoelectric sensors. The principle of operation of the element is based on a change in bit depth. Experts believe that the modification has a high-quality wired output. The membrane in this case is used with quartz plates.
The dielectric constant is located at around 3%. The minimum frequency is maintained at 3 Hz. There is no protection system for this sensor, however isolation is provided. It is also worth noting that the modification has only one lining, which is made of copper.
Features of the sensors Master 350 CT
The specified piezoelectric sensor is made to determine the temperature in aggressive environments. Many experts point to a high output impedance parameter. In this case, the module is used of a contact type, and its insulation is of the third class. In total, the device has two quartz plates. Their conductivity is 4 microns. The operating frequency, as a rule, is 3 Hz. The spherical heel of this modification is absent. The capacitance of semiconductors is 40 pF.
Description of the elements of the Master 380 CT series
This piezoelectric sensor is distinguished by the rapid transmission of positive potential. It is also worth noting that the model uses only one contact type module. Many experts say that the model is allowed to be used in high humidity environments. However, the sensor also has disadvantages. First of all, it is worth mentioning the low dielectric constant. Resistance problems are rare.
The thrust bearing is not capable of operating at a frequency of 3 Hz. The manufacturer does not provide a protection system for the modification, and insulation is installed in the second class. Connection to measuring equipment is carried out through two conclusions. The spherical type heel is capable of operating at a frequency of 5 Hz. The transmission of negative potential does not take much time.
Elements of the MLH200 series
This piezoelectric sensor is able to quickly measure the ambient pressure. If we talk about the features of the modification, it is important to note a good parameter of the output resistance. The dielectric constant of the element is only 40%. A spherical type heel is installed together with a contact membrane.
It is also worth noting that the model is able to quickly transmit positive potential. The protection system for the modification is not provided, and the insulation is installed in the third class. Connection to the measuring equipment can be carried out through two conclusions. The modification sleeve is connected to quartz plates. It is also worth noting that the capacitance of semiconductors is 30 pF.
Features of the MLH220 sensors
The specified piezoelectric vibration sensor is made with two contact membranes. In this case, quartz plates are used with increased permeability. The working frequency of the modification is at 4 Hz. According to experts, the case is able to withstand heavy loads. It is also worth noting that the resistance at the output contacts is approximately 30 ohms. Unfortunately, the element protection system is not provided.
However, insulation is installed by the manufacturer of the first class. The shielded sleeve in this case is fixed to the membrane. Many experts say that the model is capable of boasting a quick transfer of positive potential. It is also worth noting that the model has a special module that is responsible for the conductivity of the signal. The capacity of the conductor is 50 microns. In this case, the dielectric constant of the element is at least 60%. The leakage of charges presented to the sensor is not terrible.
Description of the elements of the MLH255 series
This sensor (piezoelectric, intrinsically safe) is produced with one transition membrane, which has a very high negative resistance parameter. Humidity problems are rare, and insulation is used in the third class. In total, the sensor has three quartz plates.
It is also worth noting that the model has good output conductivity. Metal linings under the membrane are not provided by the manufacturer. Special attention should be paid to a high-quality conductor, whose capacitance is 4 pF. The element protection system is not provided. At the same time, the transmission rate of the negative potential is poor.
Elements of the MLH265 series
The sensor of the presented series is manufactured with two membranes, which have a conductivity of 4 microns. Quartz conductors are able to work at a humidity of 55%. In this case, the maximum operating temperature is 40 degrees. There is no protection system for this sensor, and insulation is used in the second class. The minimum frequency of the element is maintained at 5 Hz.