AEX Level Sensor for Ultra-Pure Water Systems

Overview

The AEX Level Sensor (Model CYZTLPTK1) is a high-stability, low-drift liquid level detection module engineered specifically for integration into ultra-pure water (UPW) generation and distribution systems. Unlike general-purpose industrial level sensors, the CYZTLPTK1 employs dual-mode sensing architecture—combining conductive and capacitive principles—to ensure reliable, non-invasive level monitoring in deionized (DI) and ultrapure water environments where conductivity falls below 0.055 µS/cm. Its design addresses the critical challenge of false triggering caused by surface tension, micro-bubble formation, or trace organic contamination—common failure modes in UPW reservoirs, feed tanks, and point-of-use storage vessels. The sensor operates within a temperature-compensated range of 2–35 °C and maintains long-term stability under continuous exposure to Class I UPW per ASTM D1193 and ISO 3696 specifications.

Key Features

• Hybrid sensing technology: Simultaneous conductive and capacitive measurement eliminates reliance on water conductivity alone—critical for detecting low-conductivity UPW with high repeatability (±0.3% FS typical).
• Chemically inert wetted materials: 316L stainless steel housing and PEEK-insulated electrodes resist corrosion, leaching, and particle shedding—fully compatible with UPW system validation requirements.
• Zero-contact mounting option: Clamp-on capacitive mode enables installation without tank penetration, preserving system integrity and eliminating potential leak paths in cleanroom-grade piping.
• 4–20 mA analog output with HART® protocol support (optional): Enables seamless integration into SCADA, DCS, or PLC-based water system controllers while supporting remote diagnostics and calibration verification.
• IP68-rated enclosure with FDA-compliant cable gland: Certified for continuous submersion in water-filled sumps and splash-prone environments adjacent to UPW skids.
• Low-power operation (≤1.2 W): Minimizes thermal drift and supports battery-backed operation in emergency monitoring configurations.

Sample Compatibility & Compliance

The CYZTLPTK1 is validated for use with resistivity >18.2 MΩ·cm (25 °C), total organic carbon (TOC) <1 ppb, and silica <0.1 ppb UPW streams. It complies with mechanical and electrical safety standards including IEC 61000-6-2 (EMC immunity) and IEC 61000-6-4 (EMC emissions). While not a standalone medical device, its construction and material certifications align with USP and EP 2.2.48 guidance for water quality instrumentation used in pharmaceutical manufacturing. The sensor supports audit-ready documentation packages—including material traceability (MTR), RoHS/REACH declarations, and calibration certificates traceable to NIM (National Institute of Metrology, China).

Software & Data Management

The CYZTLPTK1 does not include embedded firmware-based software but delivers calibrated analog signals compatible with industry-standard data acquisition platforms such as Siemens Desigo CC, Emerson DeltaV, and LabVIEW-based custom UPW dashboards. When paired with HART-enabled transmitters, configuration and diagnostic data—including sensor health status, zero/span history, and temperature compensation logs—are accessible via standard HART communicators (e.g., AMS Device Manager). All operational parameters are stored in non-volatile memory and retain settings through power cycles. For GxP-regulated environments, integration with validated SCADA systems ensures full 21 CFR Part 11 compliance—including electronic signatures, audit trails, and change control records—when deployed within a qualified water system architecture.

Applications

• Real-time level monitoring in UPW storage tanks (polyethylene, stainless steel, or quartz-lined vessels)
• Feed-level control in EDI (electrodeionization) and UV oxidation modules
• Overflow protection in point-of-use polishing loops serving semiconductor cleanrooms
• Interlock signaling for pump start/stop logic in multi-stage purification skids
• Redundant level verification in dual-sensor configurations per ISA-84.00.01 SIL-2 functional safety requirements
• Validation support during IQ/OQ/PQ protocols for ultra-pure water systems in biopharma facilities

FAQ

Is the CYZTLPTK1 suitable for TOC-sensitive UPW applications?

Yes—the sensor’s electrode geometry and surface passivation minimize electrochemical interaction with organics, and no catalytic surfaces are exposed to the water stream.
Can it be calibrated in-situ without draining the tank?

Conductive mode requires known reference levels for zero/span adjustment; however, capacitive mode supports field verification using dry-air and water immersion benchmarks without system shutdown.
Does it meet semiconductor industry purity requirements (SEMI F57)?

While not certified to SEMI F57 as a standalone component, its material composition and particle-shedding performance have been verified per SEMI F63 test methods in third-party cleanroom labs.
What is the recommended maintenance interval?

No scheduled maintenance is required; periodic verification against master level references every 6 months is advised for GMP environments.
Is explosion-proof certification available?

Not applicable—the unit is rated for non-hazardous locations only (Class I, Division 2 not supported).