MM500 Corrosive Gas Moisture Analyzer
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | MM500 |
| Pricing | Available Upon Request |
Overview
The MM500 Corrosive Gas Moisture Analyzer is a high-stability, process-integrated trace moisture measurement system engineered specifically for aggressive industrial gas streams. It employs the phosphorus pentoxide (P2O5) electrolytic cell principle—a well-established, NIST-traceable method for quantitative water vapor detection in ppmv—where water molecules are irreversibly dissociated at the anode and recombined at the cathode, generating a current linearly proportional to moisture concentration. Unlike optical or capacitive sensors, the P2O5 cell exhibits minimal cross-sensitivity to common corrosive gases such as chlorine (Cl2), hydrogen chloride (HCl), hydrogen sulfide (H2S), sulfur dioxide (SO2), hydrogen bromide (HBr), and sulfuric acid vapor (H2SO4), making it uniquely suitable for chlor-alkali, semiconductor etch gas, and petrochemical refining applications where sample integrity and sensor longevity are critical.
Key Features
- Wide dynamic range: 0.01–1000 ppmv with automatic range switching and corresponding dew point equivalents (–90 °C to –20 °C)
- Dual-unit display: Simultaneous or user-selectable readout in ppmv, °C dew point, or °F dew point
- Integrated thermal mass flow controller (optional): Maintains precise 100 mL/min sample flow rate; includes flow fault detection and alarm output
- Remote probe capability: Standard coaxial cable connection supports probe distances up to 100 m; extended-range version enables installation up to 1 km from analyzer
- Robust process interface: 1/8″ OD stainless steel Swagelok® compression fitting; compatible with sample pressures from 0.25 to 7.0 bar (gauge)
- Isolated analog outputs: Configurable 0–10 V, 0–100 mV, or 4–20 mA signals with galvanic isolation for noise immunity in industrial environments
- Microprocessor-based control: Onboard diagnostics, real-time status monitoring, and programmable calibration verification intervals
Sample Compatibility & Compliance
The MM500 is validated for continuous operation in Class I, Division 2 hazardous locations when installed with appropriate conduit seals and grounding. Its P2O5 sensor assembly features chemically inert borosilicate glass and platinum electrodes, ensuring long-term stability in highly reactive matrices. The analyzer meets IEC 61000-4 electromagnetic compatibility standards and complies with ISO 8573-1:2010 Annex B for compressed gas moisture measurement traceability. For regulated industries—including pharmaceutical bulk active ingredient synthesis and semiconductor front-end fabrication—the system supports audit-ready documentation through optional calibration verification logging aligned with GLP and FDA 21 CFR Part 11 data integrity requirements.
Software & Data Management
While the MM500 operates as a stand-alone instrument with local LED display (5-digit, high-brightness), its analog outputs integrate seamlessly into DCS, SCADA, or LIMS platforms via standard signal conditioning modules. The optional automated calibration verification function allows scheduled exposure to certified reference gas (e.g., NIST-traceable H2O-in-N2 standards) at user-defined intervals (e.g., daily, weekly). Deviations exceeding ±5% of full scale trigger visible warnings and relay-based fault signals, enabling proactive maintenance planning. All calibration events, flow status, and sensor health metrics are timestamped and retained in non-volatile memory for post-event forensic review.
Applications
- Chlorine drying verification in membrane cell chlor-alkali plants
- HCl purity monitoring for polysilicon production and PVC synthesis
- SO2 feed gas qualification in sulfuric acid manufacturing
- Etchant gas moisture control (Cl2, HBr) in semiconductor fab tool purge lines
- Moisture specification enforcement for high-purity specialty gases per SEMI F63 and ASTM D7617
- Real-time validation of desiccant dryer performance in continuous process streams
FAQ
What measurement principle does the MM500 employ?
It uses the phosphorus pentoxide (P2O5) electrolytic cell method, which provides absolute, linear response to water vapor concentration in corrosive gas matrices.
Can the MM500 measure moisture in wet H2S without sensor degradation?
Yes—the P2O5 cell’s inert construction and electrochemical mechanism prevent poisoning or drift under typical H2S partial pressures encountered in sour gas processing.
Is the 1-km remote probe option field-installable?
Yes, using shielded, low-capacitance coaxial cable with proper grounding and EMI suppression; full system calibration must be performed after installation.
Does the MM500 support digital communication protocols like Modbus or HART?
No—it is analog-output only; however, third-party analog-to-digital gateways can enable integration with modern control systems.
How often should the P2O5 sensor be replaced?
Typical service life exceeds 18 months in clean, steady-state Cl2 or SO2 streams; replacement frequency increases with exposure to condensable acids or particulates—monitoring response time (>60 s to 90%) indicates end-of-life.
