Technical principle: The precise way of laminar pressure difference
Gas flow measurement plays a key role in industrial process control, laboratory research, environmental monitoring, and medical equipment. Faced with the problems of long preheating time and high environmental impact of traditional thermal flow meters, Shaanxi Yidu Intelligent Technology has chosen a technical path based on laminar pressure difference principle.

The core of laminar pressure difference technology lies in a precise design of laminar flow components. When gas flows through this component, it is forced into a state called "laminar flow" - gas molecules flow in parallel and orderly layers like well-trained soldiers, with almost no turbulence or mixing.

In this state, a precise proportional relationship is formed between the viscous frictional force generated inside the gas and the flow velocity. According to the Hagen Poiseuille law, there is a simple and precise linear proportional relationship between the pressure difference generated at both ends of the laminar flow element and the volumetric flow rate of the gas flowing through it.

By measuring this pressure difference, the flow meter can directly calculate the volumetric flow rate of the gas. More importantly, by combining real-time measurement of gas temperature and pressure data, the internal microprocessor of the system can automatically convert volumetric flow into more practical mass flow output, completing a critical leap from basic physical phenomena to engineering applications.

Core advantage: Why choose laminar pressure differential flowmeter
The core advantage of laminar pressure differential mass flowmeter is that it simplifies complex flow measurement into direct physical relationships. The choice of this technological route has enabled it to surpass traditional thermal flow meters in multiple dimensions.

Measurement accuracy and repeatability are the primary advantages of Yidu products. Based on the natural linear relationship between pressure difference and volumetric flow rate under laminar flow conditions, its accuracy reaches ± 0.5% reading level, and its repeatability is as high as ± 0.1% F.S. (full scale), which makes it occupy a unique position in fields such as vacuum coating, semiconductor manufacturing, and biopharmaceuticals that require precise measurement.

The extremely low pressure loss characteristic is also an important highlight. The laminar flow element has a compact structure and smooth flow channel. When gas passes through, it mainly overcomes viscous resistance rather than severe kinetic energy loss. Therefore, the pressure loss caused to the pipeline system is very small, significantly reducing the energy consumption demand for gas transportation.

Unlike thermal flow meters that require prolonged preheating, Yidu's laminar pressure differential products enable immediate use without the need for preheating waiting time, saving valuable time and gas resources for researchers.

The Yidu flowmeter has a wide range ratio, with some models reaching 200:1, which means that a single instrument can accurately measure both small and relatively large flow rates, with strong adaptability.

Product Array: From Basic Measurement to Precise Control
Shaanxi Yidu Intelligent Technology provides a complete product line, from basic measurement to precision control, to meet the needs of different application scenarios. Its products cover a wide flow range from 0.5 sccm (standard milliliters per minute) to 5000 slpm (standard liters per minute).

Intelligent Control: SC100 Standard Laminar Mass Flow Controller
For application scenarios that require precise control of gas flow, Shaanxi Yidu has launched the SC100 standard laminar mass flow controller. The original intention of this product design is to provide high-precision, high repeatability, and easy-to-use flow control solutions for laboratories in universities and research institutions.

The SC100 controller is also based on the principle of laminar pressure difference, but adds precise flow control function. The set value accuracy is as high as ± 1.0%, with a repeatability of ± 0.2% F.S., compatible with over 70 gases and editable mixed gases.

The controller has an intuitive touch screen operation interface, and researchers do not need to connect computers or external PLC devices. They can directly complete operations such as setting flow rates, switching gas media, adjusting mixed gas ratios through the touch screen, and view real-time changes in multiple parameters such as temperature, pressure, volume flow rate, mass flow rate, and cumulative flow rate.

In terms of environmental adaptability, SC100 maintains high standards consistent with flowmeter products: working flow range of 1%~120% F.S., medium temperature of -20 ℃~60 ℃, ambient temperature of -20 ℃~50 ℃, and operating humidity of 0%~98% (non condensing).

One of the popular features of this product among users is the ability to switch to flow meter mode, achieving multiple uses for one device, greatly improving the flexibility and value of the equipment.

Key parameters: Overview of performance indicators
Shaanxi Yidu's laminar pressure differential products exhibit superior technical characteristics in multiple aspects. The following is an integrated presentation of their main performance parameters:

In terms of measurement accuracy: Depending on different models and application requirements, the reading accuracy ranges from ± 0.5% to ± 1.0%, with a repeatability of ± 0.1% F.S.

Environmental adaptability indicators: The working temperature range covers -20 ℃ to 60 ℃, the environmental temperature range is -20 ℃ to 50 ℃, the humidity range is 0% to 98% (no condensation), and the working pressure is 2Mpa.

Electrical characteristics: Supply voltage 24V ± 20%, consumption current less than 150mA (less than 3W), response time up to 100ms, support plug and play, no preheating time required.

Connection and Communication: Provides digital signal interfaces such as RS485 and Profibus, as well as 4-20mA and 0-5V analog signal outputs, compatible with various industrial control systems. The gas receiving part is made of SUS316L material to ensure corrosion resistance.

Intelligent function: Built in more than 70 gas databases, supporting one click switching of gas types and independent editing of mixed gases, without the need for manual input of conversion factors. The color LCD touch screen provides an intuitive human-computer interaction interface, simplifying the operation process.

With the transformation of China's manufacturing industry, flow meters made of SUS316L stainless steel are undergoing final testing on the production line of Shaanxi Yidu.

These devices are about to be sent to university laboratories, semiconductor production lines, and environmental monitoring stations across the country. Their precise diversion channels will ensure that every gas sample can be accurately measured and controlled.

In the pursuit of high-precision industrial and scientific research fields, these seemingly small advances are driving Chinese manufacturing to a higher level.