BMP180 vs MLH350BSD14B
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| Category | Pressure Sensors, Transducers | Pressure Sensors, Transducers |
| Manufacturer | Bosch Sensortec | Honeywell Sensing and Productivity Solutions |
| Description | SENSOR PRESSURE ABS | SENSOR SEALED GAUGE 0-350 BAR |
| Package | 7-VLGA | Cylinder, Metal |
| Series | - | MLH |
| Voltage - Supply | 1.62 V ~ 3.6 V | 9.5 V ~ 30 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Package / Case | 7-VLGA | Cylinder, Metal |
| Supplier Device Package | 7-LGA | - |
| Output | 16 ~ 19 b | 4 mA ~ 20 mA |
| Accuracy | ±2% | ±0.25% |
| Output Type | I²C | Analog Current |
| Termination Style | PCB | M12 |
| Pressure Type | Absolute | Sealed Gauge |
| Operating Pressure | 4.35 PSI ~ 15.95 PSI (30 kPa ~ 110 kPa) | 5076.32 PSI (35000 kPa) |
| Port Style | No Port | Threaded |
| Maximum Pressure | 145.04 PSI (1000 kPa) | 10152.64 PSI (70000 kPa) |
| Features | - | Amplified Output, Temperature Compensated |
| Port Size | - | Male - 1/4" (6.35mm) BSP |
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1. What is a pressure sensor?
A pressure sensor is a device that can convert a pressure signal into an electrical signal and is widely used in various industrial automatic control environments. It usually consists of a pressure sensitive element and a signal processing unit, which can sense the pressure signal and convert it into a usable output electrical signal according to a certain rule.
Definition and function
The basic concept of a pressure sensor is to convert a pressure signal into an electrical signal for subsequent signal processing and control. The working principle of a pressure sensor is mainly based on physical phenomena such as piezoelectric effect, strain effect and capacitance effect. The piezoelectric effect refers to the fact that certain materials generate electric charge when subjected to pressure; the strain effect refers to the deformation of the material when subjected to pressure, thereby changing the resistance value; the capacitance effect refers to the change in capacitance value caused by pressure change.
Classification
According to the working principle and structural characteristics, pressure sensors can be divided into the following categories:
Piezoresistive pressure sensor: based on the strain effect, usually made of semiconductor materials.
Piezoelectric pressure sensor: based on the piezoelectric effect, usually made of crystal or ceramic materials.
Capacitive pressure sensor: based on the capacitance effect, composed of two conductors and an insulating medium.
Fiber optic pressure sensor: uses the light transmission characteristics of optical fiber to convert pressure signals into optical signals. -
2. What are the three types of pressure sensors?
There are three main types of pressure sensors:
Gage pressure sensor: This sensor is used to measure pressure relative to atmospheric pressure. It is usually used to measure the pressure of liquids or gases and convert pressure changes into electrical signal output.
Differential pressure sensor: The differential pressure sensor uses two different pressure ports to measure the pressure difference relative to each other. It is often used to measure the pressure difference between two different locations, such as measuring flow in a fluid system.
Absolute pressure sensor: Absolute pressure sensor is used to measure absolute pressure, that is, pressure relative to a vacuum. It is not affected by atmospheric pressure and is often used for high-precision measurements and applications that require stable pressure readings.
In addition, there are other types of pressure sensors, such as piezoresistive, capacitive, piezoelectric, strain gauge, fiber optic pressure sensor, and magnetostrictive. These sensors have different characteristics and application fields.
For example:
Piezoresistive pressure sensor: simple structure, small size, low cost, high sensitivity and accuracy, widely used in consumer electronics, medical equipment and industrial control.
Capacitive pressure sensor: has good dynamic response characteristics and stability, suitable for aerospace, automobile manufacturing and precision instruments.
Piezoelectric pressure sensor: does not require external power supply, has extremely high sensitivity and fast response time, and is often used for high-frequency vibration measurement and dynamic pressure monitoring.
Strain pressure sensor: has a wide measurement range, high accuracy and good stability, and is widely used in industrial automation, engineering machinery and aerospace.
Fiber optic pressure sensor: has strong anti-electromagnetic interference ability, corrosion resistance, high temperature resistance, suitable for pressure measurement in harsh environments.
Magnetostrictive pressure sensor: has high accuracy, fast response and good reliability, and is often used in high-precision pressure measurement and control systems. -
3. What is the difference between a pressure sensor and a pressure transmitter?
The main differences between pressure sensors and pressure transmitters are working principles, signal processing, and application scenarios.
Working principle
Pressure sensor: The main function of a pressure sensor is to convert a pressure signal into an electrical signal. Common pressure sensors include resistance strain gauges, ceramic pressure sensors, and diffused silicon pressure sensors. These sensors convert pressure changes into electrical signal outputs through piezoresistive or piezoelectric effects.
Pressure transmitter: The pressure transmitter adds a signal conditioning module to the pressure sensor, which can further amplify, convert, and output an electrical signal proportional to the pressure. Transmitters usually have higher accuracy and stability and are suitable for a wider range of pressures.
Signal processing
Pressure sensor: Usually outputs signals directly related to pressure, such as resistance values, capacitance values, etc., which require further processing to obtain useful information.
Pressure transmitter: Directly outputs standard electrical signals, which are easy to process and interpret in the control system and are suitable for various automated control systems.
Application scenarios
Pressure sensor: Widely used in scenarios where real-time pressure monitoring is required, such as industrial automation, medical equipment, etc. Due to its high accuracy and stability, it is also suitable for laboratories, instrumentation, and precision measurement fields.
Pressure transmitter: widely used in process control, energy management and other fields, such as petroleum, chemical, water treatment and other industries. Due to its integrated, intelligent and miniaturized characteristics, it is also suitable for various harsh industrial environments.
In summary, pressure sensors and pressure transmitters have significant differences in principles, signal processing and application scenarios. Users should choose suitable products according to specific needs.
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4. What is the difference between sensors and actuators?
The main difference between sensors and actuators lies in their functions, design principles and application scenarios.
Function and design principle
Sensor: A sensor is a device that converts various physical quantities (such as temperature, pressure, light intensity, etc.) into easy-to-process electrical signals. Its main function is to detect and collect physical quantities in the environment, and convert these physical quantities into electrical signal output for further processing and analysis.
Actuator: An actuator is a device that converts electrical signals, air pressure, hydraulic pressure and other energies into physical motion. Its main function is to perform corresponding action control according to the received electrical signal, such as controlling the movement of the robot, adjusting the cutting of the machine tool, etc.
Application scenarios
Sensors: Sensors are usually used in areas that require monitoring environmental information, controlling automation equipment, adjusting motion control systems, such as smart homes, aircraft, robots, etc.
Actuators: Actuators are used to adjust control systems, convert energy, complete mechanical work, etc., such as hydraulic pumps driven by electric motors, pneumatic control valves, etc.
