Product Overview
4-20mA Output Industrial Hydraulic Digital Pressure Transmitter
The ESMPS pressure transmitter is a highly sophisticated and ubiquitous device designed for precise pressure measurement and conversion in demanding industrial production environments. By converting the physical quantity of pressure into a standard electrical signal, it allows seamless integration with modern control systems, PLCs, and display devices. As one of the core components of automated measurement and control systems, it guarantees operational safety and efficiency.
This diffused silicon pressure transmitter is specifically engineered for robust pressure monitoring in pipelines, reaction vessels, and storage tanks. It is widely adopted across the chemical, petroleum, and power industries. Furthermore, it plays a critical role in municipal water supply systems, oil pipe networks, gas distribution, and the water circulation systems of central air conditioning units.
Working Principle
The core technology of the diffused silicon pressure transmitter relies on the piezoresistive effect of semiconductor materials. It uses imported high-performance pressure chips where the sensitive element forms precision resistors through advanced processes such as diffusion or ion implantation. These resistors are meticulously connected to form a Wheatstone bridge circuit.
Using state-of-the-art micromachining technology (MEMS), a highly sensitive pressure-responsive diaphragm is formed beneath the bridge. When external pressure from water, oil, or gas is applied to this isolation diaphragm, it transfers the pressure via silicone oil to the semiconductor chip. This causes the diaphragm to deform slightly, which alters the resistance values of the Wheatstone bridge due to the piezoresistive effect.
By applying a stable DC power supply to the Wheatstone bridge, this change in resistance generates a linear millivolt voltage output signal that is strictly proportional to the applied pressure. This raw signal is then processed by an advanced secondary conversion circuit (incorporating temperature compensation and amplification) to produce an industry-standard two-wire 4-20mA, 0-5V, or RS485 digital output signal, ensuring zero signal degradation over long transmission distances.
Product Features
316L Stainless Steel Isolation
Features a robust 316L stainless steel isolation diaphragm structure, ensuring exceptional resistance to corrosion and wear. Ideal for harsh industrial media including corrosive gases and abrasive fluids.
High Precision & Stability
Delivers high precision (0.5% or 0.25% accuracy class) with strong anti-interference capability. Engineered for excellent long-term stability (≤0.1%FS/YEAR) even in fluctuating temperature environments.
Versatile & Compact
Small size and lightweight design make it incredibly easy to install. Offers a wide measurement range (-100KPA to 100MPA), capable of measuring absolute pressure, gauge pressure, and sealed pressure.
Application Scenarios
Water Pipe Monitoring
In municipal water supply networks, HVAC cooling systems, and industrial wastewater treatment, maintaining consistent pressure is vital. The transmitter continuously monitors hydraulic pressure, providing real-time data to variable frequency drive (VFD) pumps. This prevents pipe bursts due to overpressure and ensures adequate flow during peak demand. Its 316L stainless steel wetted parts prevent contamination of potable water.
Oil Pipe Networks
Petrochemical plants and oil refineries require stringent safety standards. The diffused silicon pressure transmitter is highly shock and vibration resistant, making it perfect for monitoring crude oil pipelines, hydraulic oil systems, and lubrication oil networks. It accurately detects pressure drops that might indicate leaks or blockages, ensuring operational safety and environmental protection.
Gas Pipeline Distribution
Whether monitoring natural gas distribution networks, compressed air lines in manufacturing, or specialized industrial gases, precise pressure control is non-negotiable. The transmitter offers excellent sealing and explosion-proof structural options. It efficiently measures absolute and gauge pressure of gases, providing critical data to SCADA systems to regulate compressor outputs and maintain safe pipeline integrity.
Selection & Installation Guide
How to Select the Right Model
- Measuring Range: Determine the normal operating pressure and maximum overload pressure. Select a range where the normal working pressure is about 50%-75% of the full scale.
- Medium Compatibility: Ensure the fluid or gas is compatible with 316L stainless steel. For highly corrosive media, specialized diaphragms may be required.
- Output Signal: Choose between analog (4-20mA, 0-5V, 0-10V) or digital (RS485) based on your PLC or control system requirements.
- Process Connection: Match the threading (e.g., M20*1.5, G1/4, 1/2NPT) to your existing pipeline infrastructure.
- Temperature Range: Note if the application involves high temperatures. Standard models handle -40~85℃, while high-temperature models can withstand up to 200℃ via cooling fins.
Installation Guidelines
- Location: Install the transmitter in an area free from severe vibration and extreme temperature fluctuations. Ensure it is easily accessible for maintenance.
- Mounting Orientation: For liquid pipelines, install the tap at the side of the pipe to prevent sediment buildup. For gas pipelines, install at the top to avoid moisture accumulation.
- Sealing: Use appropriate thread seal tape or O-rings to ensure a leak-proof connection without over-tightening, which could damage the diaphragm.
- Wiring: Follow the wiring diagram strictly. Use shielded cables in environments with high electromagnetic interference, and ensure the shield is grounded at one end.
- Power Supply: Verify that the supply voltage matches the specifications (e.g., 12-30VDC) before powering on to prevent circuit burnout.
Troubleshooting
Even highly reliable diffused silicon pressure transmitters may encounter issues due to environmental factors or improper installation. Here are common problems and their solutions:
| Symptom | Possible Cause | Solution |
|---|---|---|
| No Output Signal | Power supply failure, incorrect wiring, or broken cable. | Check the power source voltage. Verify the wiring against the manual. Inspect cables for physical damage. |
| Inaccurate Reading | Zero drift, improper range selection, or blocked pressure port. | Recalibrate the zero point. Ensure the process range matches the transmitter scale. Clean the pressure port carefully without touching the diaphragm. |
| Fluctuating Signal | Electromagnetic interference, severe pipeline vibration, or unstable power supply. | Ensure shielded cables are properly grounded. Install a damping device or relocate the transmitter away from vibration sources. Stabilize the power supply. |
| Output Stays at Maximum | Overpressure event damaging the diaphragm or internal short circuit. | Check if pipeline pressure exceeded 150% overload capacity. If the diaphragm is ruptured, the unit must be replaced. |
Technical Specifications
| Measuring range | -100KPA ~ 0 ~ 100MPA |
| Measuring medium | Media compatible with 316L stainless steel |
| Accuracy class | 0.5% / 0.25% |
| Output signal | A1: 4-20mA (Two wire) | V4: 1-5V | V5: 0-5V V10: 0-10V | V05: 0.5-4.5V | RS: RS485 |
| Supply voltage | 9-30VDC / 12-30VDC / 5VDC |
| Stability | ≤0.1%FS/YEAR |
| Overload capacity | 150% |
| Ambient temperature | -30 ~ 85℃ |
| Medium temperature | -40 ~ 85℃ (Normal temperature) -40 ~ 200℃ (High temperature) |
| Electrical connections | H: Hermann | Hk: Aviation plug | Z: Direct outlet |
| Installation method | M20*1.5 ; G1/4 ; G3/4 ; 1/4NPT ; 1/2NPT ; DN50.5 |
Factory Display
Core Advantages & Company Profile
Xi'an ESM Tech Co., Ltd. - Team Profile
The team of Xi'an ESM Tech Co., Ltd. has been quietly dedicated to the field of instrumentation and sensors for 11 years. Composed of 50 core members, this team takes technology as its foundation and service as its link. Under the leadership of the company's management, it has established the development keynote of "pursuing excellence and putting customers first" since the company's founding in 2014. The core leadership of the team has integrated the philosophy of "working steadily and operating with integrity" into every aspect of the team's work.
From the initial product development to serving global customers today, we have proven with professionalism and integrity that true competitiveness stems from every member's dedication to quality and commitment to collaboration.
Technological Innovation
Technological breakthroughs are the core competitiveness of this team. As a high-tech enterprise team integrating R&D, production, and sales, they always focus on core products such as pressure, flow, temperature, and liquid level control, and continuously refine their expertise in segmented technical fields like industrial instrumentation.
Relying on Xi'an's solid industrial and technological foundation, the company keeps pace with the intelligent development trend of the industry. It integrates cutting-edge technologies such as the Internet of Things (IoT) and edge computing into product design, achieving constant product iteration to meet the needs of industrial automation upgrading.
Contact Xi'an ESM Tech Co.,Ltd.
Address
Room 30113, Building 1, Longyuan International building, Yuanshuo Road, Weiyang District, Xi'an, Shanxi Province
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