EONTECH MT1000 Portable Trace Moisture Analyzer (Electrolytic Dew Point Meter)

Overview

The EONTECH MT1000 is a portable trace moisture analyzer engineered for high-accuracy, real-time measurement of water vapor concentration in aggressive and ultra-dry process gases—particularly chlorine (Cl₂), hydrogen chloride (HCl), sulfur dioxide (SO₂), and hydrogen sulfide (H₂S). It employs the electrolytic measurement principle, an absolute humidity method based on Faraday’s law of electrolysis. In this technique, water molecules in the sampled gas are selectively decomposed at a phosphoric acid (H₃PO₄)-impregnated platinum electrode assembly into hydrogen and oxygen. The resulting electrolytic current is directly proportional to the mass flow rate of water entering the sensor cell, enabling quantitative determination without reliance on calibration drift or reference standards. Unlike capacitive or chilled-mirror technologies, the MT1000 delivers stable, zero-drift performance over extended operation—critical for continuous monitoring in chlor-alkali plants, semiconductor gas delivery systems, and high-purity specialty gas production lines.

Key Features

• True portable design with integrated rechargeable lithium-ion battery and IP65-rated enclosure for field deployment in industrial environments.
• Electrolytic sensor (TMS-H/P/100) constructed with Hastelloy cell body and platinum electrodes—chemically inert against corrosive halogenated and acidic gases.
• User-configurable measurement ranges (0–10, 0–100, 0–1000, or 0–2500 ppm H₂O) with automatic range switching and manual override mode.
• High-resolution detection down to 0.1 ppm with ±1% full-scale accuracy across all ranges—validated per ISO 8573-8 and ASTM D6304 Annex A2 protocols.
• Fast dynamic response: T₅₀ < 8 seconds; full stabilization typically achieved within 60 seconds after step change in moisture concentration.
• Non-consumable sensor architecture: The H₃PO₄ membrane regenerates in situ during normal operation; periodic cleaning (every 6–12 months) is performed manually using standard lab-grade solvents—no sensor replacement required.
• Robust analog and digital I/O: Isolated 4–20 mA output compliant with NAMUR NE43, two programmable alarm relays (SPDT, 250 VAC/2 A), and touchscreen interface with data logging capability.

Sample Compatibility & Compliance

The MT1000 is validated for use with over 25 industrial gases—including noble gases (He, Ar, Kr, Xe), diatomic gases (H₂, N₂, O₂, F₂), reactive species (Cl₂, HCl, SO₂, H₂S, PH₃), and fluorinated compounds (SF₆, Freons, C₂H₂). It excludes only gases known to chemically attack phosphoric acid membranes (e.g., strong alkaline vapors or ammonia above trace levels). The system complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions), and supports GLP/GMP-aligned operation through timestamped data export (CSV) and configurable audit trails. While not FDA 21 CFR Part 11 certified out-of-the-box, its firmware architecture permits integration with validated LIMS or MES platforms requiring electronic record integrity.

Software & Data Management

The MT1000 features an embedded Linux-based operating system with a 5-inch capacitive touchscreen GUI. Real-time moisture concentration, sensor status, temperature/pressure diagnostics, and alarm history are displayed simultaneously. Data can be exported via USB or microSD card in time-stamped CSV format, including raw current values, calculated ppm readings, and environmental metadata. Optional Bluetooth 5.0 module enables wireless configuration and trend review using the EONTECH FieldLink mobile app (iOS/Android). No proprietary drivers or cloud dependency are required—data files are fully compatible with Excel, MATLAB, and industrial SCADA historians.

Applications

• Chlor-alkali production: Continuous monitoring of Cl₂ and HCl dryer exit streams to ensure compliance with ISO 8573-1 Class 1 (≤0.1 ppm) specifications.
• Semiconductor fab gas cabinets: Verification of ultra-high-purity (UHP) process gases prior to tool inlet—especially critical for etch and deposition tools sensitive to hydroxyl contamination.
• Polysilicon manufacturing: Moisture control in SiH₄, HCl, and Cl₂ supply lines to prevent oxide formation and particle generation.
• Pharmaceutical inerting: Validation of nitrogen or argon purge gas dryness during lyophilization and vial filling operations per USP .
• Power transformer SF₆ monitoring: Detection of hydrolysis byproducts indicating insulation degradation—aligned with IEEE C57.104 guidelines.
• Heat treatment furnace atmospheres: Real-time dew point verification in endothermic and exothermic generated atmospheres to avoid decarburization or scaling.

FAQ

Is the electrolytic sensor consumable?
No—the TMS-H/P/100 sensor uses a non-depleting phosphoric acid membrane. Electrolyte regeneration occurs continuously during operation; only periodic surface cleaning is required.
Can the MT1000 measure moisture in hot gas streams above 50°C?
Yes, the sensor accepts sample temperatures up to +150°C, but sustained exposure >50°C accelerates membrane dehydration. For reliable long-term accuracy, inline cooling or heat-sink mounting is recommended.
Does the analyzer require daily calibration?
No—electrolytic measurement is an absolute method traceable to fundamental physical constants. Zero checks with dry nitrogen (≤0.1 ppm) are recommended weekly; span verification every 3–6 months using NIST-traceable moisture standards.
What gas pressure range is supported?
The sensor operates optimally between 0.1 and 0.5 barg. Below 0.1 barg, flow control becomes unstable; above 0.5 barg, increased diffusion resistance may affect response linearity.
How is sensor cross-sensitivity to other gases mitigated?
The platinum/H₃PO₄ electrochemical cell exhibits high selectivity for water due to the narrow thermodynamic window of water electrolysis (1.23 V vs. SHE). Gases such as CO₂, CH₄, and N₂ show negligible interference; confirmed per EN 15481-2 test methodology.