Product Overview
Advanced Hydrostatic Liquid Level Monitoring Solutions
The ESMWLPS submersible water level sensor is an exceptional liquid level measurement instrument engineered based on the advanced principle of hydrostatic pressure sensing. Designed for ultimate precision and reliability, the sensor probe is directly immersed at the very bottom of the targeted liquid. By accurately sensing the varying water pressure, it intelligently calculates the exact water level depth in real-time.
At its core, this state-of-the-art device utilizes a highly sensitive diffused silicon piezoresistive chip. It seamlessly outputs a standard 4–20mA analog signal, alongside options for 0-5V, 0-10V, and RS485 digital outputs, allowing for direct and effortless integration with PLCs, digital display meters, SCADA systems, or industrial control cabinets. This product boasts remarkable features including unparalleled high accuracy (0.5% FS), ultra-fast response times, strong long-term stability, and incredibly easy installation that requires absolutely no complex calibration procedures.
Perfectly suited for a myriad of demanding applications such as municipal water tanks, deep groundwater wells, critical fire safety pools, and corrosive sewage treatment tanks. The robust housing is meticulously crafted from premium 304 or 316L stainless steel, rendering it highly corrosion-resistant, exceptionally durable, and fully capable of operating flawlessly in various harsh media, including both clean drinking water and untreated industrial wastewater. It stands as a mainstream, cost-effective, and highly reliable solution in both industrial and domestic liquid level monitoring landscapes.
Working Principle
How Hydrostatic Pressure Level Sensors Operate
The Physics of Hydrostatic Pressure
The operation of the ESMWLPS Submersible level sensor is deeply rooted in the fundamental proportional relationship between the static pressure exerted within a liquid column and the actual height of that liquid level. The exact measurement is mathematically derived using the standard hydrostatic formula: P = ρ × g × h.
In this equation, P represents the static pressure at the measurement point, ρ (rho) stands for the specific density of the liquid being measured, g is the constant acceleration due to gravity, and h is the critical liquid level height or depth from the surface.
Signal Conversion & Transmission
As the sensor is submerged, the highly sophisticated pressure-sensitive element (diffused silicon core) housed securely inside the rugged sensor probe detects the minute variations in static pressure. This physical pressure physically deforms the internal diaphragm.
This micro-deformation alters the electrical resistance of the piezoresistive bridge, instantly converting the physical pressure signal into a precise, proportional electrical signal. This signal is then meticulously amplified, temperature-compensated, and transmitted via a specialized, vented waterproof cable directly to a display instrument, data logger, or automated control system, where it is finally converted and displayed as the exact liquid level height.
Product Features
Why Choose ESMWLPS Submersible Level Transmitters?
1. Easy & Flexible Installation
Designed for ultimate user convenience, the sensor can be effortlessly installed via direct vertical insertion, flange mounting, or threaded connection. It requires absolutely no complex modifications to the existing storage container. It is highly suitable for both open atmospheric and closed vented containers, providing immediate, accurate readings the moment it is immersed in the liquid medium.
2. Accurate & Stable Measurement
Operating strictly on the proven hydrostatic principle and integrated with advanced digital temperature compensation elements, the sensor delivers exceptionally high measurement accuracy (up to 0.5% FS) and outstanding long-term repeatability. Crucially, its performance remains completely unaffected by surface foaming, turbulence, or heavy sediment accumulation at the bottom of the tank.
3. Reliable & Durable Structure
Featuring a state-of-the-art solid-state encapsulation design with absolutely zero moving parts, the sensor effectively eliminates mechanical wear and tear, thereby drastically extending its operational lifespan. The robust probes are meticulously crafted from premium 304 or 316L stainless steel, ensuring unparalleled resistance to severe chemical corrosion and mechanical impact.
4. Wide Range of Applicable Media
This highly versatile instrument is engineered to accurately measure a vast array of liquids, including clean drinking water, contaminated wastewater, heavy oils, aggressive chemical liquids, and even high-viscosity pasty media. Its superior measurement mechanism remains entirely unaffected by the electrical properties (dielectric constant) of the medium or minor, localized density fluctuations.
5. Comprehensive IP68 Protection
Boasting exceptional IP68-rated waterproof sealing performance, the sensor is built to survive continuous submersion. The integrated transmission cables are constructed from special waterproof materials (PVC, PUR, or PTFE), with some heavy-duty variants reinforced with internal steel wire or Kevlar to prevent stretching in deep wells. Advanced internal circuitry features robust reverse polarity protection and overload current limiting, ensuring safe operation in the harshest industrial working conditions.
6. Strong Functional Adaptability
The sensor seamlessly supports a wide variety of industry-standard signal outputs, including the ubiquitous 4-20mA loop, 0-5V/0-10V voltage outputs, and RS485 Modbus RTU digital protocols. This allows for direct, plug-and-play interfacing with modern SCADA and control systems. Furthermore, select advanced models can integrate local digital display modules for instantaneous, intuitive on-site data reading.
Application Scenarios
Versatile Deployment Across Multiple Industries
01. Reservoir & Dam Safety Monitoring
Scenario: Strategically installed in narrow piezometer tubes or embedded deep inside the concrete dam body, it continuously monitors critical reservoir water levels and internal seepage pressure in real-time.
Function: Acts as an essential early warning system to prevent catastrophic dam failures caused by unprecedented water levels, allowing engineers to accurately assess long-term structural stability.
02. Urban Waterlogging & Flood Warning
Scenario: Deployed extensively in low-lying urban road intersections, subterranean underpasses, and beneath major highway overpasses prone to flash flooding.
Function: The moment water accumulation breaches the pre-set safety warning line, the sensor automatically triggers emergency municipal alarms and seamlessly links to automated drainage pump stations, ensuring uninterrupted urban traffic safety and protecting civilian lives.
03. Wastewater Treatment Plants
Scenario: Essential for monitoring levels in turbulent regulation pools, highly oxygenated aeration tanks, deep sedimentation tanks, and dense sludge concentration tanks.
Advantage: Unlike ultrasonic sensors that fail when encountering thick surface scum, heavy foam, or dense steam, our submersible hydrostatic sensors bypass these surface anomalies entirely, providing highly accurate readings from the bottom up, significantly improving overall plant treatment efficiency.
04. Water Supply & Distribution Networks
Scenario: Installed in massive municipal clear water tanks, elevated high-level water towers, and expansive underground reservoirs.
Function: Delivers the precise data necessary to strictly control high-power pump start/stop cycles, maintain a perfectly constant pressure water supply across the city grid, and absolutely prevent costly water tower overflow or dangerous dry-running drainage events.
05. Petrochemical & Industrial Processing
Scenario: Utilized in monitoring massive crude oil storage tanks, volatile chemical raw material vats, and extensive finished oil pipeline networks.
Requirement: Equipped with mandatory explosion-proof certifications (Ex ia / Ex d) and constructed with specialized alloys (like Hastelloy or PTFE coatings) to guarantee absolute resistance against highly corrosive liquids, including strong acids, aggressive alkalis, and industrial solvents.
06. Agriculture, Irrigation & Aquaculture
Scenario: Deployed in remote agricultural reservoirs, extensive irrigation channels, deep groundwater extraction wells, and high-density industrial aquaculture workshops.
Function: Facilitates the fully automated control of agricultural irrigation pumps, optimizing precious water resource utilization to prevent crop drought or flooding. In aquaculture, it constantly monitors water depth, automatically linking to essential aerators and water exchange systems to ensure a perfectly stable and healthy breeding environment for fish and shrimp.
Installation Guide
Best Practices for Ensuring Maximum Accuracy and Lifespan
Pre-Installation Inspection
Before proceeding, carefully inspect the sensor probe, the fragile diaphragm, and the entire length of the cable for any signs of physical damage incurred during shipping. Ensure the selected sensor's measurement range, output signal type, and power supply requirements perfectly match your specific on-site control system specifications.
Proper Submersion Technique
Gently lower the sensor probe into the liquid. Never drop the sensor freely or allow it to violently strike the bottom of the tank, as the sudden shockwave can permanently rupture the sensitive internal silicon diaphragm. In deep wells or highly turbulent environments, it is strongly recommended to install the sensor inside a protective stilling well (a perforated steel or PVC pipe) to shield it from dynamic water currents and physical debris.
Cable Management and Venting
The specialized sensor cable contains a microscopic atmospheric vent tube running through its core, which is absolutely critical for compensating for changes in barometric pressure. Do not pinch, kink, bend sharply, or cut this cable without proper sealing techniques. Ensure the top termination point of the cable is housed in a dry, ventilated junction box equipped with a desiccant filter to prevent moisture from entering the vent tube and causing internal condensation.
Electrical Wiring and Grounding
Strictly follow the provided wiring diagram. For standard 4-20mA two-wire systems, ensure correct polarity between the power supply and the signal receiver. Implement robust grounding practices to protect the highly sensitive internal electronics from devastating electromagnetic interference (EMI), radio frequency interference (RFI), and potential lightning-induced power surges, especially in outdoor installations.
Technical Specifications
Detailed Performance Parameters of ESMWLPS
| Parameter | Specification Detail |
|---|---|
| Product Number | ESMWLPS Input Type Submersible Water Tank Level Sensor |
| Measuring Range | 0 - 200 meters (Customizable up to 500m for deep wells) |
| Output Signal Options | 4~20mA (Standard) / 0-5V / 0-10V / 0.5-4.5V / RS485 Modbus |
| Measurement Accuracy | 0.5% FS (Standard) ; 0.25% FS (High-precision optional) |
| Power Supply | 12~36V DC (Typically 24V DC) / 5V DC for specific outputs |
| Protection Class | IP68 (Fully Submersible and Dust-tight) |
| Applicable Media | Clean Water, Groundwater, Sewage, Oil, Mild Chemicals |
| Probe Material | Stainless Steel 304 / 316L (Anti-corrosive) |
| Cable Material | PVC (Standard) / PUR (Oil resistant) / PTFE (Chemical resistant) |
| Operating Temperature | -20°C to +80°C (Compensated range: -10°C to +70°C) |
Product Detail & Design
Precision Engineering Visualized
Troubleshooting & FAQ
Common Issues and Professional Solutions
Solution: Signal fluctuation is most commonly caused by intense fluid turbulence or strong electromagnetic interference. First, ensure the sensor is installed inside a protective stilling well (a perforated pipe) to shield it from dynamic water movement. Secondly, verify that the cable shield wire is securely and properly grounded at the control cabinet end to eliminate EMI/RFI noise.
Solution: This typically indicates a blocked pressure port or a damaged diaphragm. Carefully extract the sensor and visually inspect the bottom pressure port. If it is clogged with mud, silt, or debris, clean it extremely gently using low-pressure water. Never insert sharp objects (like needles or screwdrivers) into the port, as this will instantly puncture the sensitive silicon diaphragm, permanently destroying the sensor.
Solution: This usually points to an issue with atmospheric pressure compensation. Check the termination end of the sensor cable. Ensure the microscopic vent tube inside the cable is completely unobstructed, open to the atmosphere, and not pinched or flooded with water. Additionally, verify that the specific gravity (density) of the liquid being measured matches the density the sensor was originally calibrated for (e.g., measuring heavy slurry with a sensor calibrated for pure water will yield incorrect high readings).
Solution: The standard ESMWLPS with a 304/316L stainless steel housing is suitable for water, oils, and mild chemicals. For highly aggressive, concentrated acids or alkalis, you must specify our customized anti-corrosive models, which feature robust PTFE (Teflon) housings and specialized flush ceramic or Hastelloy diaphragms engineered specifically to withstand severe chemical attacks.
Factory Display & Manufacturing Excellence
State-of-the-Art Production Facilities
Company Profile & Core Advantages
Xi'an ESM Tech Co., Ltd. - Your Trusted Automation Partner
The elite team at Xi'an ESM Tech Co., Ltd. has been quietly and passionately dedicated to the highly specialized field of industrial instrumentation and advanced sensors for over 11 years. Composed of 50 brilliant core members, this cohesive team takes cutting-edge technology as its unshakeable foundation and unparalleled customer service as its vital link. Under the visionary leadership of the company's management, we have firmly established the developmental keynote of "pursuing absolute excellence and putting global customers first" since our founding in 2014.
R&D Technological Innovation
Technological breakthroughs represent the true core competitiveness of our team. As a premier high-tech enterprise integrating R&D, production, and global sales, we focus relentlessly on core products such as pressure, flow, temperature, and liquid level control. By integrating IoT and edge computing, we continuously refine our expertise, ensuring our products meet the highest standards of industrial automation upgrading.
Quality Full-Process Control
The highly efficient and deeply collaborative organizational structure endows our team with lasting vitality. Our production department strictly adheres to rigorous international process standards, ensuring that highly specialized products, such as our submersible level transmitters, meet and exceed demanding industry specifications. From raw material inspection to final calibration, quality is guaranteed.
Service Global Market Focus
Our dedicated sales and technical service teams closely monitor shifting market demands and rapidly transmit crucial application feedback from the industrial automation field directly to the R&D department. This forms a highly responsive, closed-loop mechanism of "R&D - Production - Market", allowing us to provide customized, high-quality solutions for our rapidly expanding overseas sales network.
Contact Us
Get Professional Technical Support and Quotations
Room 30113, Building 1, Longyuan International building, Yuanshuo Road, Weiyang District, Xi'an, Shanxi Province, China
+86 18092149087
+86 18192964634