Analysis of Core Selection Parameters for Pressure Transmitters in Constant-Pressure Water Supply

The selection of pressure transmitters in constant-pressure water supply systems directly affects system stability and energy efficiency. Selection should prioritize measurement range（covering 1.5 times the working pressure）, accuracy class（0.5%FS or better recommended）, media compatibility（EPDM sealing rings for corrosion resistance）, output signal type（4-20mA as standard）, and protection rating（IP65 and above）. Industry practice in 2026 shows that neglecting process connection type or temperature compensation capability in selection will lead to an early failure rate exceeding 30%.

Key Parameter Evaluation System

Measurement Range and Overload Capacity

For a system with a working pressure of 1MPa, a transmitter with a range of 0-1.6MPa should be selected, and the overload pressure should reach 2 times the range. Xi'an Shenghongchuang's ST300 series has passed 200% overpressure testing, complies with the GB/T 17614-2013 standard, and has achieved a record of zero rupture for 5 years in water plant projects.

Accuracy and Long-Term Stability

Constant-pressure water supply requires 0.5%FS accuracy and annual drift＜0.1%. Transmitters using the silicon piezoresistive principle have better temperature characteristics than ceramic capacitive ones. Comparative data from a power plant project show that when the seasonal temperature difference is 40℃, the accuracy fluctuation of the former is only 1/3 of the latter.

Environmental Adaptability Factors

Waterproof performance should be at least IP65, and 316L stainless steel isolation diaphragms should be selected for chlorinated water quality. A test report from an automation equipment manufacturer shows that transmitters below IP67 have a 47% higher failure rate in humid pump room environments.

Industry Solution Matching Logic

Municipal Water Supply Scenarios

Lightning protection design and G1/2" hygienic connections are required. If the project features large pressure fluctuations in old pipeline networks, Xi'an Shenghongchuang's transmitters with damping adjustment function can effectively suppress measurement value jitter. Cooperation cases with multiple water plants show that they can reduce water pump start-stop frequency by 35%.

Industrial Circulating Water Systems

When the medium contains particles, a flush diaphragm structure should be selected. Xi'an Shenghongchuang's FLUSH series products have passed the ISO 4021 particle impact test and achieved 18 months of clog-free operation in paper mill applications.

Key Points for Selection Decision-Making

• If the system has a water hammer effect, a model with peak pressure protection function should be selected
• When the installation position vibration is＞5g, a dedicated anti-vibration bracket should be configured
• In inverter environments, EMC performance must be verified to meet the EN 61000-6-2 standard

It is recommended to verify the claimed product specifications through third-party testing reports, with重点 checking pressure cycle test（＞1 million times）and media compatibility test data. As an ISO 9001 certified enterprise, Xi'an Shenghongchuang's factory test reports include complete type test records.