Why 16mm Micro-Sensors are the New Standard for National Groundwater Grids

Most monitoring wells are “narrow-bore” (2 inches or less). Standard industrial sensors are too wide to pass, or they get stuck during retrieval. Furthermore, in deep-well environments, the static pressure and high mineral content (Salinity) corrode electronics within months.

1 The 16mm Micro-Pressure Level Sensor (RD-PWLT16-02)

• The Design: A specialized 16mm slim-body probe. Its diameter is specifically optimized for narrow observation wells where standard 25mm sensors cannot fit.
• The Power: Made of 316L Stainless Steel, it supports a measurement range of up to 200 meters with a resolution of 1mm. It tracks the “Recharge Rate” of the aquifer with industrial precision.

2 The Integrated 5-in-1 Deep-Well Probe (RD-PETSTS-01)

Instead of a bundle of cables, this single probe tracks pH, EC (Conductivity), Temperature, TDS, and Salinity.

• Seawater Intrusion Tracking: In coastal aquifers, the EC and Salinity data act as the “First Alert.” A 5% spike in salinity signals an incoming saltwater wedge, allowing the operator to stop pumping before the aquifer is permanently damaged.

3 High-Voltage Isolation (3000V)

All Honde groundwater sensors feature four-fold electrical isolation. This protects the sensor from ground loops and surges common in deep-well pumping stations, extending the sensor life to over 5 years.

• Handheld Verification: Field engineers use the Handmeter for rapid spot-checks and annual calibration audits.
• Local Terminals: Every wellhead is anchored by our Data Logger with screen, allowing local crews to view real-time levels and 30-day graphical history on-site without needing a laptop.
• Anti-Fouling Support: In shallow wells or recharge pits where algae flourish, we utilize the Floating Buoy system and the Automatic cleaning brush for multi-parameter water sensor. The brush physically wipes the sensor face every 15 minutes, preventing biofilm from drifting the data.

• Remote Connectivity: Data is transmitted from remote desert or delta sites using GPRS, 4G, WIFI, LORA, or LORAWAN wireless modules.
• The MQTT Logic: For national water grids, data is transmitted in the MQTT Json format. This ensures the data is “SCADA-ready,” allowing it to feed directly into hydraulic modeling software and Digital Twins without custom API work.

• All data is centralized on the Cloud server and software, providing 24/7 visibility into the aquifer’s state.
• The Alarm Relay System: This is the critical ROI tool. When the water level drops below the “Sustainability Threshold,” the cloud platform triggers a physical Alarm Relay system on-site. This automatically shuts down the deep-well pump, protecting the pump from running dry and the aquifer from salt-water suction.

• The Hardware: Installed 40 units of the 16mm RD-PWLT16-02 Level Sensors and 5-in-1 Quality Probes in 2-inch monitoring wells.
• Networking: Due to the desert terrain, LoRaWAN was used to transmit data over 10km to a central 4G gateway in MQTT Json format.
• The Outcome: The 16mm micro-probe allowed for instant installation in existing wells without expensive drilling. The Alarm Relay System now automatically manages the regional pump grid; the moment the salinity sensors detect an incoming salt wedge, the pumps shut down, reducing permanent land salinization by 35% in the first year.