NEW DEVELOPMENT: Enhancing Groundwater Level Monitoring with Our New 2-Inch IoT Sensor Housings
- Muskan Shrestha
- Feb 21
- 9 min read
We eliminated the challenges we faced and provided exceptional solutions for the customized housing for the level and temperature monitoring of 2-inch width wells, Cost? Significantly lower than any product in the market
Groundwater is a precious natural resource that plays a crucial role in supporting ecosystems, agriculture, industry, and domestic water supply. However, the over-exploitation and mismanagement of groundwater resources have led to concerns about declining water levels and potential environmental consequences. Effective groundwater level monitoring is essential to understanding and managing this valuable resource sustainably.
Groundwater serves as a vital water source for more than 2 billion people worldwide and contributes significantly to irrigation, maintaining stream flow, and supporting ecosystems.
In this context, the development of the Ellenex PLM2 (Miniature Level Sensor) series represents a significant architectural shift in hydrometric telemetry. By engineering a solution specifically optimized for narrow 2-inch (approximately 50mm) monitoring wells, the technology addresses the primary economic and logistical barriers to widespread aquifer monitoring. Traditional monitoring infrastructure often requires large-diameter well construction, which incurs substantial capital expenditure and significant manual labor for data retrieval. The PLM2 series, encompassing the PLM2-N (NB-IoT/LTE Cat-M1) and PLM2-L (LoRaWAN) variants, integrates precision sensing, ultra-low-power electronics, and advanced wireless communication into a compact 15.8mm sensor head, effectively redefining the cost-to-value ratio in the Industrial Internet of Things (IIoT) sector.
In this blog, we unveil the extraordinary potential of custom-designed IoT sensors: PLM2, specifically tailored to fit snugly within 2-inch wells. Imagine the possibilities of gathering real-time data from the depths of these narrow spaces with incredible precision and efficiency. From precision data gathering to eco-friendly efficiency, these miniature wonders are poised to reshape the landscape of well monitoring. Let's dive into the world of Tiny Tech Titans and unlock the future of smart well management. However, the path to creating these Tiny Tech Titans is not without its challenges. Join us as we delve into the obstacles faced during manufacturing and unveil the ingenious solutions that make these IoT sensors truly unstoppable.
Overcoming Manufacturing Barriers in Miniaturization
The development of the "Tiny Tech Titans" within the PLM2 series required the resolution of several complex manufacturing challenges that historically hindered the miniaturization of industrial-grade level sensors. These challenges were addressed through a combination of advanced fabrication techniques and collaborative engineering.
Precision Engineering and Microfabrication
Designing sensors to fit perfectly within the confines of a 2-inch well diameter necessitates a departure from traditional industrial machining. Ellenex utilized advanced Computer Numerical Control (CNC) machining and microfabrication techniques to craft the custom housing. Microfabrication enables the creation of physical devices on substrates using technologies such as micromoulds and micromechanical structures, which are essential for developing sensors with minimal footprints. By integrating IoT monitoring directly into the CNC machining process, the manufacturing facility achieved real-time data collection and predictive maintenance, ensuring that each PLM2 unit maintains the exacting tolerances required for its 15.8mm sensor head.
Environmental Resilience and Material Selection
Subsurface environments are characterized by high hydrostatic pressures, significant temperature fluctuations (often between 0°C and 60°C for compensated ranges), and exposure to potentially corrosive groundwater chemistry. The solution involved an extensive material testing phase to identify resilient options. The integration of Viton O-rings and specialized coatings creates a hermetic seal that shields the sensitive microelectronics from the elements, ensuring unwavering durability in harsh well environments.
Miniaturization of Electronics: System-on-Package (SoP)
The internal electronic architecture of the PLM2 demands the miniaturization of the sensing element, processing unit, and wireless transmitter without compromising signal integrity. Ellenex utilized modular design principles and collaborated with microelectronics experts to employ System-on-Package (SoP) concepts, where the packaging itself becomes functional. This approach allows for the harmonization of multiple components—including the pressure transducer, temperature compensation circuitry, and the LPWAN radio—within the confined space of the housing, utilizing every available millimeter of space.
Strategic Power Management
Powering a remote IoT sensor within a limited 2-inch housing presents a fundamental trade-off between battery volume and operational longevity. The PLM2 addresses this through a dual-strategy approach. First, the device utilizes ultra-low-power components and a optimized circuit design. Second, the firmware is configured to keep the transmitter in a "deep sleep" mode after every sampling interval, which can be remotely assigned based on customer requirements.
Power Metric | Specification | Impact on Longevity |
Standby Current | <3μA | Minimizes parasitic drain during inactive periods |
Transmission Current | < 200mA | High efficiency during active wireless uplink |
Rated Battery Life | 10+ Years (Depending upon the use cases) | Reduces the need for frequent site visits and maintenance |
Reading Capacity | 6,000+ Readings | Enables high-frequency data collection for long-term studies |
Global Cost-Effectiveness through Workflow Optimization
A primary objective of the PLM2 development was to achieve a cost profile significantly lower than established market alternatives. The production team adopted iterative design processes to optimize the manufacturing workflow, thereby reducing material waste and streamlining costs. Close collaboration with suppliers allowed for the negotiation of better prices for specialized components, resulting in a product that is 30 percent to 40 percent lower in cost compared to traditional options. This economic advantage is a critical driver for the scalability of IoT networks in groundwater management.
What are the applications of Miniature level Sensors(PLM2)?
The PLM2 series is engineered for two primary applications where narrow-diameter access and remote connectivity are essential.
The most widespread application of the PLM2 is the monitoring of aquifers through existing 2-inch narrow wells. Both the PLM2-L (LoRaWAN) and PLM2-N (NB-IoT/LTE-M) variants are widely deployed for this purpose, providing high-precision data on water availability across vast and remote geographical areas. In regions with limited infrastructure, these sensors allow for near real-time visualization of water levels every few hours, facilitating better water conservation, precise agricultural planning, and proactive drought prediction.
Urban environments often feature complex, underground stormwater infrastructure that is difficult to access. The PLM2-L and PLM2-N are both used for real-time management of stormwater to mitigate flood risks. Their superior signal penetration allows them to transmit data through thick infrastructure and heavy manhole covers, providing decision-makers with instant visibility during extreme weather events. This application is critical for urban disaster prevention, ensuring the integrity of municipal infrastructure and protecting environmental ecosystems from overflow events.
Case Study: Precision Monitoring in Narrow-Diameter Wells
In a notable implementation of the technology, a German water management authority sought to modernize its Well monitoring network, which consisted primarily of legacy 2-inch diameter monitoring wells.
The Challenge: The authority faced significant difficulties in monitoring groundwater levels across remote sites in Germany, where traditional sensors were too bulky for the narrow paths and manual measurements were proving unreliable and costly.
The Solution: The authority deployed the Ellenex PLM2-N Submersible Miniature Level Sensor. The narrow-body enclosure allowed for seamless insertion into multiple bores without requiring expensive well modifications.
Data Strategy: The sensors were configured to transmit data at regular intervals via LTE-CAT M1. A primary reason for selecting the PLM2-N was its internal logging capability of 700 datapoints, ensuring data continuity and historical trend preservation even if network connectivity fluctuated due to site-specific geography.
Outcome: The authority utilized the Ellenex Software Platform exclusively for their data management, visualization, and alerting needs. By relying on the Ellenex platform’s comprehensive and user-friendly interface, the authority was able to manage their entire distributed network of wells, perform complex volume calculations, and respond to alerts from a single centralized hub without the need for additional third-party software.
Case Study 2: Industrial Aquifer Monitoring
A large-scale industrial operation in Canada implemented the Ellenex PLM2-L to manage groundwater levels across its extensive site while maintaining a private network infrastructure.
The Challenge: The company required a scalable solution for 2-inch narrow path wells in a remote environment where cellular coverage was inconsistent but long-range private connectivity was feasible.
The Solution: The PLM2-L (LoRaWAN) was selected for its long-range communication (up to 15km) and ultra-low power consumption.
Data Outcome: Because the company operated a highly specialized industrial control system, they integrated the LoRaWAN data directly into their own proprietary platform. This allowed them to own their network infrastructure entirely and combine level data with other site-specific process metrics without needing external cloud services
We made the product 30-40% lower in cost compared to other options in the market, while it meets all complex demands and exceeds accuracy and network penetration ratio
Groundwater level monitoring is a precious natural resource that plays a crucial role in supporting our lives. With climate change and the exponential increase in demands, monitoring water usage and water quality is MUST TO DO priority for governments across the globe. PLM2 is a low-cost solution to meet the demand. The Ellenex PLM2 series addresses this global imperative by eliminating the logistical and financial obstacles to subsurface monitoring. By reducing connectivity costs by approximately 60 percent compared to traditional telemetry and enabling the use of cost-effective 2-inch monitoring wells, these "Tiny Tech Titans" provide a scalable defense against aquifer depletion. Regulatory frameworks like California's SGMA demonstrate that without such data, local agencies face substantial fees and state intervention. Ultimately, whether through NB-IoT in urban Germany or private LoRaWAN networks in remote Canada, the ability to monitor our most precious resource in near real-time ensures that water remains a driver of prosperity and peace rather than a source of conflict.
Frequently Asked Questions
What are the primary objectives of implementing remote groundwater level monitoring?
Groundwater monitoring is essential for ensuring drinking water safety and identifying potential contamination issues early. It allows communities to identify groundwater levels to plan for necessary water conservation measures during droughts or emergencies. Automated systems overcome the limitations of manual measurements, which are often inefficient in areas with restricted access, and provide the timely data required to ensure sustainable water use.
These monitoring systems also support scientific studies, such as using dye tracers to determine groundwater flow directions or travel times. Long-term data collection is particularly vital for mapping the altitude of the water table and determining the regional effects of groundwater development, such as land surface subsidence. By establishing a baseline through static water level measurements, managers can identify if long-term availability is changing and react before the aquifer is at risk.
How does IoT-enabled monitoring address the specific challenges of urban stormwater and underground waterways?
Monitoring remote underground waterways is characterized by significant challenges due to physical inaccessibility and the harsh, corrosive nature of these environments. Industrial-grade sensors must be highly reliable and require minimal maintenance because frequent site visits are often impractical in hard-to-reach locations. The rugged design of these devices ensures they can withstand rapid turbulence and debris typical during storm events.
IoT-enabled monitoring reduces flood risks by providing timely alerts and constant data for decision-making. Wireless technologies like Narrowband IoT (NB-IoT) are specifically utilized for their superior penetration, allowing reliable communication even from deep underground or through thick, heavy cast-iron manhole covers. This near real-time visibility enables municipal crews to identify potential overflows or blockages before they escalate into infrastructure damage.
How does remote level monitoring improve operational efficiency in industrial water systems and storage?
Industrial water monitoring is tied directly to productivity, cost control, and regulatory compliance. It provides continuous visibility into stored water across mining sites, factories, and construction projects, replacing manual well-dipping with automated, actionable data. This approach helps operators understand refill priorities, water availability, and abnormal usage patterns that could indicate internal system failures.
Furthermore, industrial sites use these systems to close instrumentation gaps at remote treatment points or peripheral lines without the high cost of hardwired installations. This intelligence allows for earlier intervention in cases of pressure drops or leaks, ultimately enhancing asset longevity and operational efficiency. For organizations relying on process water, this automated visibility creates a more reliable foundation for daily supply continuity.
In which scenarios is LoRaWAN preferred over NB-IoT for well and underground monitoring?
Choosing between LoRaWAN and NB-IoT for well monitoring depends largely on the location and infrastructure requirements. LoRaWAN offers an open, unlicensed model that empowers users to build their own private, low-cost networks, which is ideal for remote industrial sites or rural agriculture where cellular signals are absent. It is widely used in livestock water management to monitor tanks and ensure a steady supply across vast geographical areas.
Conversely, NB-IoT is backed by existing cellular networks and is often the more reliable option for urban utility deployments. It provides deep coverage in challenging environments such as basements and underground wells where traditional cellular signals struggle. While NB-IoT excels in service reliability for stationary sensors, LoRaWAN is often preferred for its superior battery longevity and network autonomy.
Why is automated monitoring critical for meeting environmental regulatory requirements like the Sustainable Groundwater Management Act (SGMA)?
Regulatory frameworks like the Sustainable Groundwater Management Act (SGMA) mandate the monitoring of groundwater levels to mitigate overdraft and avoid "undesirable results". These undesirable effects include the chronic lowering of water levels, significant reduction in storage, and seawater intrusion. Automated systems provide the necessary physical description of the basin status and historical water demands required by local agencies to meet legal standards.
Failure to comply with these regulations can lead to state intervention, where authorities may mandate water meter installations and levy substantial usage fees. Automated sensors ensure that critical data streams are near real-time and time-stamped, providing the precise data records required for regulatory audits and compliance reporting. This technology allows users to identify areas for resource optimization while ensuring their environmental footprint remains within legal thresholds.
Useful Links
Miniature Level Sensor: PLM2-N and PLM2-L
