What is a ceramic pressure sensor?
Ceramic pressure sensors are sensor diaphragms made of ceramic alumina (Al2O3). Ceramic is a material with high elasticity, corrosion resistance, wear resistance, impact, and vibration resistance. Ceramic has good thermal stability characteristics. High-temperature sintering process for the thick film. The working temperature range of the ceramic pressure sensor is as high as -40～125℃. The high elasticity and creep resistance of ceramics. The ceramic pressure sensor has good long-term stability. Besides, the corrosion resistance of ceramics. It has advantages in the fields of refrigeration, chemical industry, and environmental protection.
The Basic Structure of Ceramic Pressure Sensor
The ceramic pressure sensor is mainly composed of a ceramic ring, a ceramic diaphragm and a ceramic cover plate.
The ceramic diaphragm acts as a sensitive elastic body. It is made of 95% AL2O3 porcelain. It is required to be flat, uniform and dense. Its thickness and effective radius depend on the design range.
The porcelain ring is shaped by high-temperature firing using a hot die-casting process. High-temperature glass slurry is used between the ceramic diaphragm and the ceramic ring. It is fired together by thick film printing and thermal firing technology. It forms a cup-shaped elastic body with a fixed peripheral edge. That is, a non-creep rigid structure should be formed in the fixed support part of the ceramic periphery.
On the upper surface of the ceramic diaphragm, which is the bottom of the porcelain cup. The circuit of the sensor is made with thick film technology. The circular groove at the lower part of the ceramic cover creates a certain gap between the cover and the diaphragm. The limit can prevent the diaphragm from rupturing due to excessive bending when it is overloaded. Form the anti-overload protection of the sensor.
Extended reading: Common Pressure Sensor Applications
Featured SI-338 Ceramic Pressure Sensor
SI-338 Ceramic pressure sensor uses ceramic or diffused silicon core. All stainless steel package, small and beautiful appearance. Suitable for occasions with limited installation space. Wide range temperature compensation, high accuracy, small size, no adjustment, wide range coverage. Support OEM processing. Ceramic pressure transmitter is used in compressor, air conditioning and other pressure measurement.
Extended reading: What Is Flush Diaphragm Pressure Sensor?
Features of Ceramic Pressure Sensor
Ceramic is a recognized material with high elasticity, corrosion resistance, wear resistance, impact and vibration resistance. The thermal stability of ceramics and its thick film resistors can make its operating temperature range as high as -40 to 135°C. It also has high accuracy and high stability for measurement. Electrical insulation degree>2kV. Strong output signal. Good long-term stability.
Ceramic sensors with high characteristics and low prices will be the development direction of pressure sensors. In Europe and the United States, there is a trend to completely replace other types of sensors. In China, more and more users use ceramic sensors to replace diffused silicon pressure sensors.
- Ceramic sensitive diaphragm with high overload capacity;
- Zero point and full scale laser calibration;
- Excellent anti-corrosion and anti-wear performance;
- Anti-shock and anti-vibration;
- High precision and high stability;
- Wide operating temperature range;
- Small size, easy to package;
- Environmental friendly;
Extended reading: What is a pressure sensor?
Ceramic Pressure Sensor Working Principle
The corrosion-resistant ceramic pressure sensor has no liquid transmission. The pressure directly acts on the front surface of the ceramic diaphragm, causing the diaphragm to produce a small deformation.
The thick film resistor is printed on the back of the ceramic diaphragm. Connected to form a Wheatstone bridge (closed bridge).
Due to the piezoresistive effect of the varistor, the bridge generates a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated to 2.0 / 3.0 / 3.3 mV/V according to the pressure range. Etc. Compatible with strain gauge sensors.
Calibration by laser. The sensor has high temperature stability and time stability. The sensor comes with a temperature compensation of 0～70℃. It can be in direct contact with most media.
Extended Reading: Up to 800°C High Temperature Pressure Sensor
Ceramic Pressure Sensor Types
The base material of ceramic pressure sensor is Al2O3 ceramic. According to the principle of realization, it can be divided into capacitive pressure sensor and piezoresistive pressure sensor.
Extended Reading: Selection of pressure transmitter
Ceramic Pressure Sensor Cost
Ceramic Pressure Sensor has low cost. The price of the ceramic pressure transmitter that people often choose is basically between USD15~35. Save a lot of costs for customers.
Extended reading: extrusion melt pressure transducer
Sino-Inst offers Ceramic Pressure Sensors. A wide variety of Ceramic Pressure Sensors options are available to you. Such as free samples, paid samples.
Sino-Inst is a globally recognized manufacturer of Ceramic Pressure Sensors, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide.
Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.
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