Application and Advantages of Pressure Transmitters in Secondary Water Supply Industry

Pressure Control Challenges Faced by Secondary Water Supply Systems

In modern urban water supply systems, the operational stability of water pumps and pipeline networks directly affects the safety of residential and industrial water usage. Traditional remote pressure gauges in non-negative pressure water supply equipment or variable frequency constant pressure water supply equipment suffer from unstable water supply, frequent maintenance, and high replacement costs. Abnormal water pressure not only reduces user experience but may also increase operation and maintenance costs and energy consumption. To address these challenges, pressure sensors and pressure transmitters have become core accessories in secondary water supply systems.

China's secondary water supply policy stipulates that, to avoid impacting urban residents' water usage, domestic and production water pumps must not be directly installed in municipal pipeline networks. To ensure that the water supply system can connect to the municipal pipeline network without generating negative pressure while meeting users' water demands, flow controllers, partitioned pressure stabilization compensation tanks, and other equipment are usually added between the pump inlet and the municipal pipeline network. Flow controllers can monitor municipal pipeline network pressure in real time, fully utilizing municipal pressure and preventing negative pressure situations.

Application of Pressure Sensors in Non-Negative Pressure Water Supply Systems

Non-negative pressure water supply systems achieve pressure balance between municipal pipeline networks and secondary water supply networks through pressure stabilization compensation tanks and vacuum eliminators. When municipal tap water enters the regulating tank at a certain pressure, the air in the pressure stabilization compensation tank is discharged through the vacuum eliminator, and the vacuum eliminator automatically closes after the tank is full. The system sends a start signal to control pump operation based on tap water pressure conditions through pressure sensors or pressure controllers.

After adopting high-sensitivity pressure sensors, non-negative pressure water supply equipment can:

• Monitor pipeline network pressure changes in real time

• Automatically adjust pump start/stop to ensure continuous water supply

• Prevent negative pressure in municipal pipeline networks

• Improve system reliability and reduce maintenance costs

This automated control method replaces traditional manual adjustment, significantly enhancing the stability and operational efficiency of water supply systems.

Intelligent Control in Variable Frequency Constant Pressure Water Supply Systems

Variable frequency constant pressure water supply systems typically consist of PLC control units, variable frequency drives, water pumps and motor groups, storage tanks, water supply pipeline networks, and pressure sensors. The system dynamically controls the number of operating pumps through PLC and adjusts motor speed via variable frequency drives to meet varying water demand. Constant pressure pumping stations are equipped with multiple pumps, including standby pumps, allowing maintenance without shutdown.

Pressure sensors in such systems are mainly responsible for:

• Monitoring water supply pipeline network pressure

• Transmitting real-time pressure signals to PLC

• Assisting the system in dynamically adjusting compensation volume to achieve constant pressure water supply

• Providing data support to optimize pumping station operation strategies

Through this method, the system can maintain stable pipeline network pressure during changes in water usage, ensuring user water experience and equipment safety.

Technical Classification and Selection of Pressure Transmitters

Pressure sensors can be classified according to output signals and internal amplification circuits as:

• Pressure sensors: Directly output analog signals, suitable for basic monitoring

• Pressure transmitters: Equipped with internal amplification circuits, providing standard current or voltage output, convenient for remote monitoring and data acquisition

According to environmental adaptability, they can be divided into:

• General type: Suitable for conventional water quality and environments

• Isolated type: Can measure corrosive media or harsh environments

According to signal type:

• Current type: 4–20 mA

• Voltage type: 0–12 V

In secondary water supply systems, pressure transmitters need to possess high waterproof and dustproof capabilities, as well as resistance to variable frequency interference, to ensure long-term stable operation.

Dynamic Pressure Balance and Intelligent Monitoring

By installing pressure transmitters or high-sensitivity pressure switches in the water supply pipeline network, the system can collect water pressure changes in real time and transmit them to the control unit. According to different operating states, the PLC or microcomputer control system dynamically adjusts compensation water volume to achieve:

• Dynamic pressure balance

• Constant pressure water supply in pipeline networks

• Energy saving and consumption reduction

• Extended equipment lifespan

This solution is applicable to non-negative pressure water supply equipment, variable frequency constant pressure equipment, and intelligent pump rooms, covering single-pump variable frequency water supply, secondary water supply equipment, and urban water supply booster pumping stations.

Advantages of Nexisense in the Secondary Water Supply Industry

Nexisense focuses on the research and development of sensors for secondary water supply, with products widely applied in:

• Non-negative pressure water supply equipment

• Variable frequency constant pressure water supply equipment

• Constant pressure water supply pumping stations

• Secondary water supply systems

• Single-pump variable frequency water supply equipment

• Integrated intelligent pump rooms

• Urban water supply pipeline network booster pumping stations

Product features include:

• Leading technology and compact structure

• High precision and fast response

• Waterproof, dustproof, and corrosion-resistant

• Resistant to electromagnetic and variable frequency interference

• Long lifespan and low maintenance costs

Established long-term stable cooperation relationships with multiple water supply equipment manufacturers, supporting intelligent upgrading of secondary water supply systems.

Application Cases and Effects

In typical variable frequency constant pressure water supply systems, after adopting Nexisense pressure transmitters, the system achieves:

• Stable pipeline network pressure within the set range

• More precise pump start/stop, reducing energy consumption

• More reliable operation of non-negative pressure water supply equipment

• Operation and maintenance costs reduced by approximately 15–30%

• System data can be remotely monitored for intelligent management

Actual projects show that pressure transmitters effectively solve the problems of unstable water supply and frequent maintenance caused by traditional remote pressure gauges, providing long-term efficient technical assurance for the water supply industry.

Frequently Asked Questions (FAQ)

Can pressure transmitters measure all water qualities?
Nexisense products offer general and isolated types, adaptable to general tap water and some mildly corrosive media, meeting secondary water supply requirements.

How long is the lifespan of pressure transmitters?
Under normal operating conditions, Nexisense pressure transmitters can operate stably for more than 5 years, with low failure rate and strong anti-interference capability.

How to handle pressure fluctuations in the system?
Through dynamic pressure control strategies and PLC adjustment, pressure transmitters can provide real-time feedback data for automatic regulation, ensuring constant pressure water supply in the pipeline network.

How is the sensor signal transmitted in variable frequency constant pressure water supply systems?
Standard current signal 4–20 mA or voltage signal 0–12 V can be used, with remote monitoring accessible to SCADA systems for real-time data acquisition.

Summary

Pressure transmitters are core components of modern secondary water supply systems and are crucial for the stable operation of non-negative pressure water supply, variable frequency constant pressure water supply, and intelligent pump rooms. Through high-precision pressure monitoring and dynamic regulation, the system can ensure constant pipeline network pressure, improve water supply efficiency, reduce maintenance costs, and support intelligent and remote management. With advanced technology, reliable performance, and industry experience, Nexisense provides professional solutions for the secondary water supply industry and serves as an important guarantee for promoting intelligent upgrading of water supply systems.