In the field of industrial automation, the selection of the PMP5074 pressure transmitter directly affects measurement accuracy and system stability. Focusing on the core needs of technical evaluation personnel, this article provides an in-depth analysis of the key differences between gas and liquid media measurement, and compares the technical characteristics and selection points of diffused silicon sensor series such as DG1300-BZ and AST-K000, helping you quickly match the optimal solution.

I. Core Differences Between Gas and Liquid Media Measurement

In flow control equipment, the differences in the physical properties of gas and liquid media significantly affect the selection of pressure transmitters. Taking the PMP5074-TA-A1-CB-H0-PW model as an example, the differences in the sensitivity of its diffused silicon sensing technology to medium density, viscosity, and compressibility are mainly reflected in the following aspects:

1. Medium Density and Pressure Transmission Characteristics

The low density of gas media (for example, air density is approximately 1.29kg/m³) causes a delay effect in pressure transmission, requiring the selection of the DG1300-BZ series with a response time of ≤1ms; while the high inertia of liquid media (for example, water density is 998kg/m³) requires the sensor to have stronger overload protection capability, such as the 150%FS safety margin design of the PT124B-210-60MPa-NPT1/4 model.

2. Differences in Temperature Compensation Mechanisms

Gas measurement is easily affected by fluctuations in ambient temperature. The AST-K000 series adopts a dual-channel temperature compensation algorithm, with the temperature drift coefficient controlled within ±0.01%FS/℃; liquid measurement, on the other hand, requires attention to medium temperature conduction, and the MSP-300-010-B-5-W-1 model achieves rapid thermal equilibrium through a 316L stainless steel isolation diaphragm.

II. Key Technical Comparison of Diffused Silicon Sensors

As the core component of pressure measurement, the performance of diffused silicon technology in different media scenarios directly affects system reliability. The DG1300-BZ-A-2 and DQ-805 series products of Xi'an Shenghongchuang Instrumentation Co., Ltd. show significant differences in the following dimensions:

1. Structural Design of Sensitive Elements

Models dedicated to gas measurement (such as DG1300-BZ-B-2) use a micromachined silicon diaphragm with a thickness of only 0.2mm to achieve high sensitivity; models for liquid measurement (DMP331-111-4000-1-3-BG1-100-1-000) are equipped with a reinforced composite diaphragm with impact resistance up to 1000g.

2. Optimization of Signal Processing Circuits

• Gas measurement: PMP5074-TA-A1-CB-H0-PW has a built-in low-noise amplification circuit with a signal-to-noise ratio of ≥80dB
• Liquid measurement: MSP-300-010-B-5-W-1 integrates a digital filtering function to suppress fluid pulsation interference

III. Selection Decision Tree and Typical Application Cases

Based on the GB/T 34036-2017 industrial sensor selection standard, we recommend that technical evaluation personnel determine the optimal solution through the following process:

1. Selection Decision Path

1. Confirm the medium type (gas/liquid/steam)
2. Measurement range (refer to the 30MPa upper limit of PT212C-30B2L32)
3. Process connection method (NPT1/4, G1/2, etc.)
4. Output signal requirements (4~20mA, 0~5V, etc.)

2. Typical Scenario Solutions

Case 1: Compressed Air Monitoring
Select the DG1300-BZ-C-2-0.6 pressure transmitter. Its 0.6MPa range and ±0.25% accuracy meet the requirements of the ISO 8573-1 air quality standard.

Case 2: Hydraulic System Pressure Control
Use the DMP331-111-4000-1-3-BG1-100-1-000 model. Its 4000psi range and <1ms response time ensure system dynamic control accuracy.

IV. Industry Trends and Technological Innovation

With the widespread adoption of IIoT technology, the new generation of pressure transmitters is showing the following development directions:

• Wireless transmission: for example, the MSP-300 series supports the LoRaWAN protocol
• Self-diagnosis function: PT124B-210 has a built-in sensor health monitoring algorithm
• Multi-parameter measurement: DQ-805 can synchronously output temperature and pressure data

Summary and Professional Recommendations

When selecting a PMP5074 pressure transmitter, technical evaluation personnel should focus on the match between medium characteristics and process requirements. As a national high-tech enterprise, Xi'an Shenghongchuang Instrumentation Co., Ltd. has product series such as DG1300-BZ and AST-K000 certified by CE and RoHS, and can provide customized solutions for industries such as petrochemicals and power energy.

Contact our technical team now to obtain selection recommendations for your specific application and detailed quotation proposals for products such as the DG1300-BZ-C-2-0.6 pressure transmitter.