Discover why Alpha USA’s high-accuracy micro differential pressure Transducers are the top choice for industries requiring reliable and precise pressure measurement. Learn about their features, applications, and benefits.
The Importance of Micro Differential Pressure Transducers in Modern Industries

In industries where precise pressure measurement is critical—such as HVAC, medical devices, cleanrooms, and industrial automation—micro differential pressure Transducers play a vital role. These Transducers detect minute pressure differences, ensuring system efficiency, safety, and performance.

At Alpha USA, we specialize in manufacturing high-precision micro differential pressure Transducers designed for accuracy, durability, and reliability. Whether you’re monitoring air flow, filter status, or gas pressure, our sensors deliver unmatched performance.
Key Features of Alpha USA’s Micro Differential Pressure Transducers

Ultra-High Accuracy – Our sensors measure even the slightest pressure differences with exceptional precision, making them ideal for sensitive applications.

Robust Build Quality – Designed to withstand harsh environments, including temperature fluctuations and vibrations.

Wide Measurement Range – Suitable for low to moderate pressure differentials, ensuring versatility across industries.

Low Power Consumption – Energy-efficient design for continuous monitoring without excessive power drain.

Digital & Analog Outputs – Compatible with various control systems for seamless integration.

Applications of Our Differential Pressure Transducers

HVAC Systems – Monitor filter clogging and airflow to maintain energy efficiency.

Cleanrooms & Laboratories – Maintain contamination-free environments with accurate pressure differential monitoring.

Industrial Automation – Optimize processes by detecting pressure changes in pneumatic systems.

Environmental Monitoring – Track gas flow and pressure in emission control systems.

Why Choose Alpha USA?

As a trusted American manufacturer, Alpha USA is committed to delivering high-quality, reliable pressure sensors backed by:
✔ Industry-Leading Expertise – Decades of experience in sensor technology.
✔ Custom Solutions – Tailored designs to meet specific application needs.
✔ Competitive Pricing – Premium performance without the premium cost.
✔ Exceptional Support – Dedicated customer service and technical assistance.
Upgrade Your Systems with Alpha USA’s Precision Transducers

If you need high-accuracy low differential pressure sensors, look no further than Alpha USA. Our products ensure reliable performance, long-term durability, and precise measurements for critical applications.

Contact us today to discuss your requirements or request a quote!

Email: contact@alphainstruments.com

Sensors will continue to be a “game changer” in many industries, both now and in the future. As the popularity of the Internet of Things (IoT) expands, our demand for sensors is growing. Four different types of sensors are currently the most popular in four industries: manufacturing, healthcare, aviation and agriculture.

1. Pressure sensors 

We all know that pressure sensors are capable of sensing the pressure of liquids and gases and then converting it into electrical signal output. With the help of the differential pressure sensor, companies can adopt Internet of Things (IoT) systems to implement real-time monitoring systems. Pressure sensors can also be used to measure fluid/gas flow, velocity, water level and height, etc. For example, in the automotive industry, pressure sensors are used in engines to monitor oil and coolant pressure, as well as in vehicle anti-lock braking systems (ABS), fluid pressure monitoring such as hydraulic pressure, pipeline pressure monitoring, etc. In addition, pressure sensors are also used in aviation, marine, industrial, biomedical instrumentation and other industries.

2. Temperature sensors   

As a regular industrial pressure sensor, the temperature sensor is used to measure the temperature or heat energy of a given source by electrical signals.

With the Internet of Things (IoT) systems, temperature sensors can be used in manufacturing, agriculture and health industries. Applications in the manufacturing industry are: plastic extruders, chemical fiber drawing equipment, plastic and rubber manufacturing equipment can simultaneously monitor the pressure and temperature. It is also important to place the machine or equipment in a suitable environment to ensure that the system always maintains a constant temperature.  Sensors can solve this problem by providing data that helps track the temperature of a given space.

3. Chemical sensors

As the name suggests, chemical sensors are used to collect information about different parts, such as composition, presence of specific elements or ions, chemical activity, partial pressure, etc.

As an industrial pressure sensor, chemical sensor is used in industrial environments for monitoring and process control to detect hazardous, explosive, or radioactive chemicals, as well as in laboratories and pharmaceutical recycling processes. Various types of chemical sensors include electrochemical gas sensors, chemical field effect transistors, pH glass electrodes, zinc oxide nanorod sensors and chemical resistors.

4. Infrared sensors

Infrared sensor can be defined as electronic devices that are sensitive to certain aspects of the surrounding environment. Infrared sensors can measure the heat of an object and detect motion.

Infrared sensors can be used in healthcare, home appliances, wearable electronics, contactless temperature measurements and other fields. Infrared sensors can also be used for environmental inspections, as it can detect many types of chemicals and heat leaks.

With sensors increasing industrial efficiency and productivity, and the adoption of Industry 4.0 in developing countries, the sensor market is expected to see significant growth in the near future.

Ⅰ. Structures of the capacitive pressure sensor

The capacitive pressure sensors are based on silicon materials, using capacitance changes to convert pressure into capacitance changes, and are made by MEMS technology.

Ⅱ. Main problems of the capacitive pressure sensor
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Because its detection principle is to use capacitive pole pitch variation, however is itself nonlinear. In order to improve the nonlinearity, develop a more complex core structure, such as contact, variable area in series with variable pole pitch, and other structures. Another problem that needs to be solved for displacement sensors is the detection of weak capacitive signals.

Ⅲ. Performance&characteristics of the capacitive pressure sensor

1. Capacitive pressure sensors are low-cost, which are suitable for mass production

The capacitive pressure sensor is made by MEMS technology, and the chip size is 3mm×3mm. A 4-inch silicon wafer can produce hundreds of components. The product has good manufacturability, consistent performance, suitable for mass production and low-cost operation. The preparation process is compatible with the IC process, and the process equipment is no need to be as expensive & complicated as the process equipment of the silicon resonant sensor, nor no need to be made in a single piece like the metal diaphragm capacitive sensor, which ensures that the silicon capacitive sensor has a high cost-performance.

2. Good stability

A capacitive pressure sensor is a structural sensor, and it also is an industrial pressure sensor. In terms of the detection principle, the stability of the pressure sensor is better than that of the physical sensor. From the perspective of the structure design, the stability of this type of sensor is ensured The structural process adopts a fully hard-sealed solid-state process, silicon-glass-metal pressure tube adopts electrostatic sealing, which reduces the stress, hysteresis, and deterioration caused by rubber sealing; the capacitor is not sensitive to temperature, the temperature additional error is not big, and it does not need to complicate temperature compensation like a silicon piezoresistive device. Good stability is one of the main reasons why silicon capacitive sensors are more popular.

3. Advanced parameters

The capacitive pressure sensor itself has the characteristics of low power, high impedance, small electrostatic attraction, and small heating effect, and can be used for non-contact measurement. The comprehensive performance index of silicon capacitive sensors such as nonlinearity, overload, static pressure, reliability, etc. are better than silicon piezoresistive sensors, ceramic capacitive sensors, and metal diaphragm capacitive sensors. The performance is equivalent to the silicon resonant sensor, especially refer to the non-linear index pursued by the user. Generally, the non-linearity of the silicon capacitive sensor is better than 0.05% FS, and the yield is more than 60%.

The pressure sensor is a device that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule. It is usually composed of pressure sensitive components and signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, low differential pressure sensors and absolute pressure sensors. However, there will be some errors in the use of sensors in measurement. Among them, there will be errors in the use of low differential pressure sensors. If there are errors, they will affect the measurement results, so we must reduce these errors when using the sensors. Here’s how to reduce the error when installing low differential pressure sensors.

When in use, the liquid pressure tube should avoid high points, and the gas pressure tube should avoid low points. This is the preparation work to be done in the layout, so that the error can be reduced.

To reduce the error, the two pressure guiding tubes should be kept at the same temperature. At the same time, the caliber should be as large as possible, and the pressure guiding tube should be as short as possible.

There must be no gas in the liquid guide tubes, and the level of the two guide tubes should be the same when the spacer is used.

When the pressure pipe is connected to the process pipeline upward, its slope cannot exceed 1/12. And it’s time to measure liquid vapor on it.

Finally, when the low differential pressure sensor is measuring gas, the pressure guide pipe we refer to shall be connected downward to the process pipeline, in which the required slope shall not be less than 1/12.

Therefore, there are many benefits to the correct installation of the low differential pressure sensor, which is also a skill that every worker must master. The installation is of vital importance to the staff, and it is also necessary to master the wiring method of the sensor. Now let’s talk about how the sensors are wired.

In fact, the wiring methods of various sensors are basically the same. Pressure sensors generally have a two-wire system, a three-wire system, a four-wire system, and some have a five-wire system.

The two-wire system of the pressure sensor is relatively simple. Generally, customers know how to connect it. One wire is connected to the positive pole of the power supply, and the other is the signal wire connected to the negative pole of the power supply through the instrument, which is the simplest method.

The three-wire system of the pressure sensor is based on the two-wire system with a line that is directly connected to the negative pole of the power supply, which is a bit more troublesome than the two-wire system.

The four-wire pressure sensor must be two power input terminals, and the other two are signal output terminals. Most of the four-wire system is voltage output instead of 4-20mA output. The 4-20mA one is called pressure transmitter, and most of them are made into two-wire system. The signal output of some pressure sensors is not amplified, and the full-scale output is only tens of millivolts, while some pressure sensors have an internal amplifier circuit, and the full-scale output is 0~2V. As for how to connect to the display instrument, it depends on the range of the instrument. If there is a gear suitable for the output signal, it can be measured directly, otherwise a signal adjustment circuit must be added.

The five-wire pressure sensor is not much different from the four-wire system, and there are fewer five-wire sensors on the market.