Heavy-Duty Deep Well Submersible Level Transmitter | SLS300D
A heavy-duty, high-surge protected submersible hydrostatic level transmitter explicitly engineered for extreme depths, deep-well pumping stations, and municipal aquifer monitoring.
The SLS300D is built to withstand the immense mechanical and electrical stresses of deep downhole deployments where standard sensors fail. Capable of measuring columns of water up to 500 meters deep, it features an enhanced internal amplifier circuit that integrates premium IEC 61000-4-5 Level 4 surge and lightning protection. With its robust 316L stainless steel diaphragm and ruggedized downhole cable, it provides long-term, drift-free level tracking in the most demanding hydrological environments.
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Built for Extreme Depths: Standard and customized measuring ranges scaling up to 500 mH2O with excellent pressure containment.
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Level-4 Surge Protection: Integrated transient voltage defense matching strict IEC 61000-4-5 Level 4 standards to survive lightning strikes.
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Ruggedized Submersible Housing: Heavy-walled stainless steel construction featuring a hermetically sealed IP68 design.
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Long-Distance Signal Stability: Optimized industrial outputs (4–20mA, RS485 Modbus) designed to prevent signal degradation over long cable runs.
Description
Uncompromised Reliability for Deep Borehole & Aquifer Infrastructure
Monitoring deep groundwater resources, open aquifers, and large-scale municipal wells requires instrumentation that can handle severe hydrostatic pressures and long-distance electrical transmission. The SLS300D is engineered as a heavy-duty solution for deep downhole operations. Operating on the hydrostatic principle where pressure correlates directly to the water column’s height, this transmitter provides continuous, high-accuracy level data under heavy structural loads.
Advanced Transient Protection Against Lightning Strikes
Deep-well installations act as natural conduits for electrical surges caused by nearby lightning strikes, which frequently destroy standard sensor electronics. The SLS300D addresses this vulnerability directly by housing a multi-stage surge protection network. By achieving IEC 61000-4-5 Level 4 compliance, the internal circuitry safely clamps high-voltage transients, ensuring continuous operation and protecting your connected RTUs, PLCs, or solar-powered data loggers from catastrophic field failures.
Features
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Extended Depth Performance: Seamlessly handles continuous pressures up to 500 mH2O without mechanical fatigue or calibration shift.
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IEC Level-4 Lightning Defense: Hardened electronic front-end protects against induced voltage spikes, ideal for remote, exposed mountain or field wells.
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Reinforced Downhole Cable: Features a heavy-duty PUR jacket paired with an internal steel strain-relief wire to prevent cable stretching or snapping under its own weight in deep shafts.
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Anti-Condensation Venting: The submersible cable contains an atmospheric vent tube equipped with a breathable, moisture-blocking filter to maintain accurate gauge reference.
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Long-Loop Signal Integrity: High-drive industrial 4–20mA loops ensure clean, noise-free analog data transmission over hundreds of meters of cable.
Specification
| Parameter | Technical Specification |
| Available Diameters | 28mm standard heavy-duty profile |
| Measuring Ranges | 0–50 m up to 500 mH2O (Gauge or absolute pressure options) |
| Surge Protection | Integrated IEC 61000-4-5 Level 4 (Lightning/Transient protection) |
| Overload Limit | 200% FS for deep-water safety margins |
| System Accuracy | ±0.5% FS standard (±0.25% FS high-precision optional) |
| Long-Term Stability | <0.2% FS/year standard under continuous submersion |
| Signal Outputs | 2-wire 4–20mA (optimized for long cable runs) / RS485 Modbus RTU |
| Diaphragm Material | 316L Stainless Steel (Optional: Hastelloy C-276, Titanium) |
| Shell Material | 316L Stainless Steel heavy-duty housing |
| Cable Jacket Selection | Reinforced Polyurethane (PUR) with internal steel strain-relief wire |
| Protection Rating | IP68 (Hermetically fully-welded downhole seal) |
FAQ
Q: What makes the SLS300D different from standard utility level sensors like the SLS300A?
A: The SLS300D is designed specifically for extreme conditions. While standard utility sensors are built for shallow tanks or water treatment facilities, the SLS300D features a heavy-walled 316L housing, specialized strain-relief cabling for deep suspension, and industrial-grade IEC Level-4 lightning protection to survive deep borehole conditions.
Q: How does the internal steel wire in the cable help in deep well applications?
A: When a sensor is dropped several hundred meters into a deep well, the weight of the cable itself can cause it to stretch over time, which distorts your depth calibrations or breaks internal wires. The SLS300D’s custom cable incorporates a structural steel core to support the weight, ensuring the sensor stays at the exact installation depth indefinitely.
Q: Can this sensor be used in narrow groundwater observation tubes?
A: The SLS300D features a rugged 28mm diameter profile to house its heavy-duty surge components and robust pressure cell. If your well or piezometric observation pipe has tight physical constraints (such as a 20mm diameter clearance), we highly recommend our ultra-slim SLS300F series (16mm or 19mm diameter) instead.
