Product Description
D21A、D18A
D21A/D18A Series Ceramic Capacitive Pressure Sensor Core
The D21A/D18A Series Ceramic Capacitive Pressure Sensor core is made of ceramic capacitive pressure-sensitive element which is based on alumina ceramic (Al2O3) as the primary material. Structurally, it consists of a thicker ceramic substrate, a thinner deformable ceramic elastic membrane, and metal electrodes printed on the ceramic. The working principle is that when the ceramic membrane undergoes deformation due to pressure, it causes a change in capacitance. This capacitance change is then processed by a signal processor to convert the pressure signal into a linear analog voltage signal or digital output.
As a major technology route in pressure sensors, ceramic capacitive pressure-sensitive elements offer many advantages, including resistance to corrosion, wear, and impact, minimal temperature drift, high measurement accuracy, wide range, pollution-free operation, high elasticity, overload resistance, and long lifespan. These elements can directly contact most corrosive gases or liquid media. During the operation of the ceramic capacitive pressure sensor, there is no fluid transmission, and the process pressure acts directly on the ceramic membrane. If overloaded, the membrane will touch the substrate without damage, and when the pressure returns to normal, its performance remains unaffected. Therefore, these sensors are widely used in automotive, industrial, and IoT applications.
Product parameters
Series Name | D21A、D18A |
Type | Ceramic Capacitive Pressure Sensor Core |
Measured pressure type | Gauge,Sealed Gauge,Absolute |
Size (diameter x height) | 21x (4.25-4.85)mm ，18x（3.35-3.95)mm |
Overload pressure | ＞2X |
Burst pressure | ＞10X |
Operating temperature | -40 ℃~150℃ |
Storage temperature | -40℃~150 ℃ |
Temperature drift | ＜0.02%FS/℃ |
Nonlinearity | ±0.20% FS |
Hysteresis & repeatability | 6.0%FS~9.0%FS 1st- order correction ; ≤ 0.5%FS 2nd-order correction ; ≤0.2 3rd -order correction |
Sensitivity | Span Capacity= Full-scale capacitance value - initial-pressure capacitance value |
Response time | ＜ 2mS |
Cycle life | ＞5 million @2-5Hz, 0-full scale -0, 15-35℃ |
Working medium | oil, water,gas,refrigerant,coolant, chemical solvents, detergents, etc |
Product Views
Unique design with strong electromagnetic interference resistance
Wide temperature adaptability
Very low temperature drift, ensuring precise and stable output in different temperature environments
Good non-linearity and long-term stability
Good compatibility with working media
Quality control
Huaxinlian Technology has a number of core patented technologies. Its products adopt the industry's most advanced design concepts and process routes. Various performance indicators have reached the international leading level. It is equipped with advanced automatic production lines and produces more than 5 million piezoresistive cores and 2 million modules annually. It is the largest ceramic pressure sensor manufacturer in China.
Application Cases
Wide range of applications: pressure transmitters, digital pressure gauges, water purification equipment, HVAC systems, water pumps, automotive thermal management systems, medical devices, industrial hydraulic and pneumatic pressure testing, fire-fighting pressure instruments, etc.
Service
Two-year warranty service, free repair or replacement for non-human quality problems during the period, ensuring peace of mind.
A professional team of engineers provides full-process technical support for the product with professional knowledge and experience.
Support customized business, tailor-made on-board MEMS pressure sensors according to customer's special needs.
