Industrial Clean Water Hydrostatic Level Transmitter | SLS300A
A highly reliable, utility-grade immersion level transmitter engineered for clean water infrastructure, reservoirs, waterworks, and environmental open-tank monitoring.
The SLS300A series utilizes a high-stability piezoresistive diffused silicon core protected by a rugged 316L stainless steel isolation diaphragm. Designed to withstand harsh outdoor deployments, it features advanced Level-4 lightning and surge protection compliant with IEC61000-4-5 standards. Available in multiple variants, including a dual level-and-temperature configuration, it offers unmatched versatility for municipal and industrial water storage.
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Built for Clean Utilities: Ideal for waterworks, storage tanks, dams, irrigation, and deep groundwater wells.
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Surge & Lightning Immunity: Heavy-duty internal protection circuits certified to IEC61000-4-5/Level-4 standards.
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Highly Configurable Options: Choose from classic all-welded models, easy-to-clean forward flush diaphragms, or integrated dual level/temperature sensing.
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Variable Depth Ranges: Calibrated factory ranges from 0–0.5m up to 300mH2O.
Description
Utility-Grade Hydrostatic Precision for Water Distribution Systems
Outdoor water infrastructure demands level monitoring equipment that can survive the elements without drifting. The SLS300A series is engineered specifically for reliable, continuous submersed measurement in clean water applications, waterworks installations, irrigation networks, and flood control assets.
Operating on the physical principle of hydrostatic head pressure (P = P₀ + ρ gh), the transmitter provides direct, reliable depth calculations unaffected by surface ripples, turbulence, or floating foam.
Four Tailored Form Factors to Match Your Setup:
Instead of trying to adapt a generic stick sensor to every tank, the SLS300A is available in four specialized industrial sub-models to streamline field integration:
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SLS300A-1 (Classic Structure): The industry standard layout for reservoirs, open tanks, and standard clean wells.
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SLS300A-2 (O-Ring Seal): Classic structure featuring high-integrity internal O-ring safety barriers.
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SLS300A-3 (Flush Welded Diaphragm): Features a forward-facing film design that resists fine sediment buildup and is incredibly easy to wipe down and maintain.
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SLS300A-4 (Level + Temperature Dual Sensor): The ultimate solution for water towers and environmental storage, capturing both liquid level and process temperature simultaneously through a single cable drop.
Features
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Integrated Lightning Defense Infrastructure: Equipped with robust internal protection hardware matching IEC61000-4-5 Level-4 rules. This actively shunts lightning strikes and industrial power grid voltage spikes safely away from the sensitive core, drastically lowering outdoor failure rates.
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Hermetic All-Welded Isolation Film: Utilizes an integrated, fully welded 316L stainless steel process diaphragm. The configuration protects the sensitive diffused silicon module from moisture migration and structural stress degradation.
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Dual Channel Measurement Optimization (300A-4): Saves structural space and tracking hardware overhead by letting field technicians measure liquid depth and fluid temperature simultaneously using a single installation port.
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Advanced Ambient Temperature Compensation: Employs an internal digital circuit layer providing active linear compensation across changing liquid temperatures. This ensures stable accuracy measurements whether deployed in cold deep mountain wells or hot industrial water basins.
Specification
| Parameter | Specification |
| Measurement Ranges |
0m~0.5m to 300mH2O |
| Overload Capacity |
≤2 times full scale value |
| Default System Accuracy |
0.5% FS (Standard) / 0.25% or 0.1% FS (High-Precision Custom) |
| Long-Term Drift Stability |
±0.1% FS/year (Typical) |
| Lightning Protection Rating |
IEC61000-4-5 / Level-4 Standard built-in |
| Power Supply Matrix |
12 to 30 VDC (Standard 4–20mA) / 8 to 30 VDC (0–5V/RS485) |
| Output Interfacing |
4–20mA (HART optional), 0–10V, 0–5V, I2C, or Digital RS485 Modbus |
| Diaphragm Material |
316L Stainless Steel (Optional: Tantalum, C-276, Titanium) |
| Housing Construction |
304 Stainless Steel standard (316L or Titanium optional) |
| Cable Jacket Options |
Heavy-duty PUR (Standard), PE, PVC, or PTFE |
| Ingress Enclosure Rating |
IP68 (Hermetically sealed submersed head assembly) |
FAQ
Q: Can the SLS300A handle media containing heavy silt or river sand?
A: For applications involving suspended grit or sand, we recommend selecting the SLS300A-3 model, which features a forward-facing flush diaphragm to prevent mud packing. Additionally, protective filtering measures or placing the probe within a stilling well should be implemented to prevent heavy particles from scratching the isolation face.
Q: What are the wiring and output options for digital integration?
A: The SLS300A offers flexible output options. For traditional analog networks, it supports 2-wire 4–20mA or 3-wire voltage loops (0–10V, 0–5V). For smart digital SCADA systems, it can be ordered with RS485 Modbus RTU, 4–20mA + HART, or low-power I2C protocols.
Q: How does the venting cable function on this transmitter?
A: The specialized submersible cable contains a hollow, internal atmospheric breathing tube running alongside the electrical conductors. This tube links the back of the internal sensor diaphragm directly to the surface air pressure, instantly compensating out local weather-driven barometric changes to ensure pure hydrostatic depth accuracy.
