Corrosion-Resistant PTFE Hydrostatic Level Sensor | SLS3100
A heavy-duty, submersible hydrostatic level transmitter engineered explicitly for strong acids, aggressive alkaline solutions, and corrosive chemical tanks.
The SLS3100 features an entirely non-metallic wetted design, utilizing a premium ceramic capacitor pressure core housed inside a rugged PTFE (Teflon) shell and sealed with fluororubber. Combined with a specialized Teflon-jacketed, atmospheric-vented cable, it delivers long-term stability and high reliability where stainless steel sensors fail.
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Wetted Materials: Pure Ceramic Core, PTFE Shell, Fluororubber Seals
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Chemical Defense: Immune to sulfuric acid, hydrochloric acid, nitric acid, and chlorine brine.
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Ventilation Safety: Teflon-injected cable with an integrated internal snorkel line for total atmospheric compensation.
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Measurement Options: Custom hydrostatic depth ranges from 1m up to 500mH2O.
Description
Engineered for Harsh Industrial Chemical Environments
Standard stainless steel submersible probes degrade rapidly when exposed to aggressive industrial processes, electroplating baths, chemical dosing systems, and municipal water treatment chemicals.
The SLS3100 series avoids chemical attack completely by utilizing zero exposed metal parts in contact with the process liquid. Its sensitive core is a dry ceramic capacitive sensor, which provides incredible fatigue resistance, zero long-term drift, and an overload capability of up to twice the full scale. The entire outer structure is precision-machined from high-grade Polytetrafluoroethylene (PTFE).
Why the SLS3100 Eliminates Common Failures:
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No Exposed Metals: Only ceramics, PTFE, and fluororubber touch your process liquid, creating a reliable barrier against aggressive media.
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Teflon Shielded Cable: The signal cable is reinforced with a custom-molded Teflon outer skin to prevent chemical penetration.
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Intrinsically Safe Design: Built for dangerous industrial areas with optional intrinsically safe explosion-proof configurations.
⚠️ Technical Deployment Note: The Teflon-jacketed ventilation cable features an internal air snorkel. Because Teflon can be scratched or sharply bent, it must be routed carefully during installation to prevent outer jacket punctures that could allow liquid path ingress into the transmitter.
Features
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Completely Non-Metallic Wetted Parts: The outer structure is precision-machined entirely from high-grade Polytetrafluoroethylene (PTFE). With zero exposed metal components touching the medium, the sensor offers complete immunity to chemical attack, pitting, and galvanic corrosion in aggressive liquids.
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Dry Ceramic Capacitive Sensing Core: Built with a premium ceramic capacitor pressure sensor. Unlike standard metal-diaphragm sensors that warp or corrode, the ceramic core provides high mechanical hardness, extreme fatigue resistance, and an overload threshold up to $le2$ times the full scale without shifting calibration.
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Teflon-Shielded Atmospheric Vented Cable: The specialized signal cable features a built-in internal snorkel line to automatically compensate for barometric pressure changes. The outer jacket is completely sealed via high-durability Teflon injection molding to prevent corrosive vapors from migrating up into the electronics container.
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Hermetically Sealed IP68 Protection: Engineered with a heavy-duty, multi-layered sealing assembly utilizing fluororubber (Viton) seals and a specialized integrated structure. This ensures the internal digital conditioning circuitry remains perfectly dry and isolated during continuous, deep submersible operation.
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Advanced Digital Signal Conditioning: Features factory-cured circuit correction, environmental simulation aging, and fatigue de-stressing processes. This advanced conditioning guarantees high long-term stability (±0.1% FS/year typical) and minimal temperature drift under varying process conditions.
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Flexible Industry Integration: Out of the box compatibility with standard industrial networking setups, available with 4–20mA (HART optional), 0–10V, or digital RS485 Modbus RTU output protocols.
Specification
| Parameter | Specification |
| Sensor Technology |
Dry Ceramic Capacitor Core |
| Wetted Structural Materials |
PTFE (Polytetrafluoroethylene), Ceramics, Fluororubber |
| Measuring Ranges |
0 to 1m … 500mH2O / -100 kPa to 7 MPa |
| System Accuracy |
0.25% F.S. (Typical) / 0.5% F.S. (Standard) / 0.1% F.S. (Customized) |
| Overload Protection Threshold |
≤2 times Full Scale |
| Long-Term Drift Stability |
±0.1% FS/year (Typical) |
| Power Supply Requirements |
12 to 30 VDC |
| Signal Output Formats |
4–20mA (HART Optional) / 0–10 VDC / RS485 Modbus |
| Ingress Rating |
IP68 Continuous Submersion |
| Media Temperature Range |
-30°C to +65°C (Submersible input-type structures) |
FAQ
Q: What specific chemicals and acids is the SLS3100 compatible with?
A: The SLS3100 is designed for extreme chemical resistance. The only materials that come into direct contact with your process liquid are pure ceramics, PTFE (Teflon), and fluororubber (Viton). It is fully compatible with aggressive media such as sulfuric acid, hydrochloric acid, nitric acid, sodium hydroxide (alkali), chlorine brine, and electroplating baths. As long as your medium does not attack these three specific materials, the sensor can safely measure it.
Q: Why is a ceramic capacitive sensor used instead of a standard stainless steel diaphragm?
A: Standard metallic diaphragms (even 316L or Hastelloy) can pit, corrode, or warp over time when exposed to harsh chemicals. The SLS3100 uses a premium dry ceramic capacitive core, which features extreme mechanical hardness and chemical inertness. Additionally, it offers superior fatigue resistance and an excellent overload capacity of up to $le 2$ times the full scale without drifting or losing calibration.
Q: What special precautions should be taken with the Teflon-jacketed cable during installation?
A: The signal cable uses a specialized, high-durability Teflon outer skin containing an internal atmospheric ventilation snorkel. Because Teflon is a softer material, it can be scratched, punctured, or sharply bent if mishandled. It must be protected carefully during installation. If the outer jacket is punctured by a sharp edge, the chemical medium can migrate through the cable jacket directly into the internal electronics, causing the transmitter to fail. We recommend routing the cable through protective conduit if the tank has rough internal walls or sharp brackets.
Q: How does the sensor handle atmospheric pressure changes while submerged?
A: The SLS3100 achieves true atmospheric pressure compensation via an integrated ventilation tube (snorkel) running through the center of the cable. This routes changes in barometric pressure directly to the back of the ceramic sensing core, ensuring that your depth readings remain perfectly accurate (±0.25% FS typical) and are unaffected by changing weather patterns or sealed tank air pressures.
Q: Can the output signal be customized for legacy control systems?
A: Yes. While the standard industrial output is a 2-wire 4–20mA loop (with optional superimposable HART protocol), the SLS3100 can also be factory-configured with a 0–10 VDC analog output or a digital RS485 Modbus RTU interface for direct networking.
