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Flush Diaphragm Pressure Transmitter: Opening a New Chapter in Efficient Wastewater Monitoring
In wastewater treatment plants, pressure data runs through the entire process of influent, transmission, treatment, and discharge. From influent pump operation status and filter differential pressure changes to sludge return and pipeline leakage judgment, pressure transmitters have always been the “sentinel devices” ensuring system safety and stable operation.
However, wastewater media typically exhibit high solid content, strong corrosiveness, easy scaling, and fiber entanglement. Traditional pressure transmitters with pressure ports or oil-filled cavities are prone to clogging, zero drift, and diaphragm damage, resulting in distorted measurements and even misjudgments and downtime risks.
To address these industry pain points, Nexisense flush diaphragm pressure transmitters provide a more reliable pressure monitoring solution for wastewater treatment systems through a design philosophy where “structure itself is the solution.”
What Is a Flush Diaphragm Pressure Transmitter
A flush diaphragm pressure transmitter is a pressure measurement device that adopts a flush-mounted diaphragm structure. The sensing diaphragm directly contacts the measured medium and is level with the installation interface, without pressure ports, measuring cavities, or dead zones found in traditional transmitters.This structural characteristic makes it particularly suitable for:
Wastewater containing fibers, sand, and suspended solids
Fluids prone to crystallization, deposition, and scaling
Viscous liquids or highly contaminated working conditions
In the wastewater treatment industry, flush diaphragm pressure transmitters have gradually become the preferred configuration for critical measurement points.
Working Principle and Measurement Mechanism
The core measurement principle of Nexisense flush diaphragm pressure transmitters is based on the diaphragm deformation–signal conversion mechanism.
When wastewater media acts on the flush diaphragm surface, pressure directly causes slight elastic deformation of the diaphragm. This deformation is converted into electrical signals through:
Strain gauge sensing structures
Thin-film sensor technology
Ceramic capacitive pressure sensing (model-dependent)
The internal signal processing circuit performs temperature compensation, linear calibration, and amplification, finally outputting standard industrial signals for continuous and stable pressure monitoring.
The entire measurement process does not allow the medium to enter internal cavities, fundamentally eliminating clogging and contamination risks.
Core Advantages of the Flush Diaphragm Structure
Significantly Enhanced Anti-clogging Capability
The cavity-free flush diaphragm structure prevents fibers, sand, and sludge from accumulating. Any deposits are easily washed away by flow, avoiding measurement drift and delayed response.
Corrosion Resistance and Long Service Life
To withstand common wastewater components such as hydrogen sulfide, strong alkalis, and acidic substances, Nexisense adopts highly corrosion-resistant materials:
Hastelloy C276 diaphragm
PTFE anti-corrosion coating
Multi-layer sealing isolation structure
This ensures diaphragm stability in harsh chemical environments and significantly extends service life.
Stable Measurement and Low Maintenance Cost
Without pressure ports or oil-filled structures, the device is less prone to contamination-related failures, greatly reducing on-site maintenance frequency and minimizing operational losses caused by downtime.
Industrial-grade Output and Strong System Compatibility
Supports standard outputs such as 4–20 mA and 0–10 V, allowing direct integration with PLC, DCS, or SCADA systems for real-time data acquisition and process linkage control.
Typical Application Scenarios
In wastewater treatment plants, flush diaphragm pressure transmitters are widely used at key points including:
Influent pump and lift pump pressure monitoring
Differential pressure measurement before and after filters and screens
Sludge transport and return pipeline pressure detection
Pipeline leakage and blockage early warning
Chemical dosing system pressure control
The advantages of the flush diaphragm structure are particularly evident in sludge thickening, dewatering, and high solid-content processes.
Measurement Methods and Installation Considerations
Flush diaphragm pressure transmitters are typically installed using direct mounting or flange mounting methods, ensuring the diaphragm is flush with the measured medium.
During installation, attention should be paid to:
Avoiding direct mechanical impact on the diaphragm
Ensuring the mounting surface is clean and flat
Selecting locations with stable media flow
Proper installation further enhances measurement stability and device lifespan.
Technical Specifications
| Item | Specification | Item | Specification |
|---|---|---|---|
| Pressure Range | −100~0~100 kPa; 0~1 MPa; 0~40 MPa | Overall Accuracy | 0.25%FS; 0.5%FS; 1%FS |
| Non-linearity | 0.2%FS | Repeatability | 0.05%FS |
| Output Signal | 4–20 mA (2-wire); 0–5 V; 0–10 V (3-wire) | Supply Voltage | 24 VDC (12–36 VDC, amplified signal) |
| Operating Temperature | −20~80 °C | Compensation Temperature | 0~65 °C |
| Response Time | < 5 ms | Overload Pressure | 150%FS |
| Electrical Connection | Hirschmann (DIN43650); Waterproof gland; Aviation connector | Pressure Connection | G1/2; 1/2 NPT; M20×1.5, etc. |
Why Wastewater Treatment Requires Flush Diaphragm Structures
In wastewater treatment systems, inaccurate pressure data directly affects:
Sludge concentration and return control
Pump station operating efficiency
Discharge compliance judgment
Energy consumption and maintenance costs
Flush diaphragm pressure transmitters effectively reduce systemic risks caused by equipment failures through precise, real-time, and low-maintenance measurement capabilities.
Frequently Asked Questions (FAQ)
Are flush diaphragm pressure transmitters suitable for highly polluted media?
Yes. Their structure is specifically designed for highly polluted and high solid-content media.
Can they directly replace traditional pressure transmitters?
In most wastewater applications, they can directly replace traditional models with improved stability.
Is the maintenance cycle longer?
Yes. The flush diaphragm structure significantly reduces cleaning and calibration frequency.
Conclusion
Nexisense flush diaphragm pressure transmitters solve industry challenges through structural innovation. With anti-clogging, corrosion-resistant, and high-stability designs, they provide a reliable pressure monitoring foundation for wastewater treatment systems.
They not only reduce maintenance costs and downtime risks but also support process stability and operational efficiency through precise, real-time data—enabling safe, compliant, and sustainable intelligent operations.
Pressure monitoring is no longer a system bottleneck, but a solid foundation supporting efficient operation.
