Leman Instruments LISAS ZA Zero-Air Generator

Overview

The Leman Instruments LISAS ZA Zero-Air Generator is a precision-engineered, laboratory-grade gas generation system designed to deliver ultra-pure, hydrocarbon-free compressed air for critical analytical applications. Based on high-temperature catalytic cracking technology, the LISAS ZA thermally decomposes trace hydrocarbons—including methane (CH₄), carbon monoxide (CO), and volatile organic compounds—within a stabilized catalytic chamber operating at controlled elevated temperatures. This process ensures consistent removal of combustible contaminants without chemical adsorbents or consumable cartridges. The resulting zero-air stream undergoes dual-stage final polishing: first through sub-0.01 µm particulate filtration, then pressure regulation and dew point control to −60 °C, guaranteeing long-term stability in purity and flow. Engineered in France with Swiss-influenced design rigor, the LISAS ZA meets stringent requirements for flame ionization detection (FID), calibration standards, permeation tube systems, and other GC- and GC-MS–dependent workflows where baseline integrity, detector sensitivity, and method reproducibility are non-negotiable.

Key Features

• Two standard flow configurations: LISAS ZA-3 (3 N·L/min) and LISAS ZA-6 (6 N·L/min), both delivering continuous zero-air at user-selectable pressures from 0.5 to 10 bar (7–145 psi)
• Real-time purity assurance: total hydrocarbons (THC), CO, and CH₄ consistently maintained below 0.05 ppm—validated per ASTM D6216 and ISO 8573-1 Annex B for instrumental air
• Integrated 4.3″ full-color TFT-LCD touchscreen interface with intuitive menu navigation, real-time parameter monitoring, alarm logging, and status diagnostics
• Dual-network connectivity via Ethernet (10/100 Mbps) and IEEE 802.11 b/g/n Wi-Fi, enabling remote configuration, firmware updates, and centralized fleet management across multi-instrument lab environments
• Self-diagnostic safety architecture: automatic internal leak test at startup, thermal runaway protection, overpressure cut-off, and fail-safe shutdown protocols compliant with IEC 61000-6-2/6-4 EMC standards
• Compact, stackable chassis (210 × 160 × 430 mm; 9 kg) optimized for benchtop deployment or modular gas network integration—no external cylinders, no scheduled maintenance, no consumables

Sample Compatibility & Compliance

The LISAS ZA is fully compatible with all major GC and GC-MS platforms requiring zero-air, including Agilent, Thermo Fisher Scientific, Bruker, Shimadzu, and PerkinElmer systems. It satisfies the instrumental air specifications outlined in USP , EP 2.5.27, and ISO 8573-1:2010 Class 1.2.1 for hydrocarbon content, particulate load, and moisture. When deployed as carrier or combustion gas in FID operation, it eliminates baseline drift caused by ambient hydrocarbon fluctuations and supports GLP/GMP-compliant chromatographic methods requiring documented gas source traceability. Optional audit-trail-enabled software modules support 21 CFR Part 11 compliance for electronic records and signatures when integrated into regulated QC/QA laboratories.

Software & Data Management

Leman’s proprietary LISAS Control Suite provides secure, role-based access for instrument supervision via local web browser or mobile device. The software logs all operational events—including pressure transients, temperature profiles, catalyst runtime hours, and alarm history—with timestamped, tamper-evident CSV export. Remote firmware updates preserve regulatory alignment without onsite service visits. For enterprise deployments, the generator supports SNMP v3 and Modbus TCP protocols, allowing seamless integration into building management systems (BMS) or LIMS platforms for predictive maintenance scheduling and resource utilization analytics.

Applications

• Primary combustion gas supply for Flame Ionization Detectors (FID) in gas chromatography
• Zero-air source for hydrocarbon calibration analyzers and dynamic dilution systems
• Carrier and purge gas for permeation tube ovens and diffusion standards
• Instrumental air for FTIR sample compartments, particle counters, and environmental simulation chambers
• Backup or primary air source in regulated pharmaceutical, petrochemical, and environmental testing labs where cylinder dependency introduces supply chain risk

FAQ

What compressed air quality is required at the inlet?
Dry, oil-free compressed air meeting ISO 8573-1 Class 3 (≤0.1 mg/m³ oil aerosol, ≤5.0 µm particles, dew point ≤−20 °C) is mandatory. Inlet pressure must exceed selected output pressure by 1–11 bar.
Does the LISAS ZA require periodic catalyst replacement?
No. The high-temperature catalytic reactor is designed for the instrument’s full service life (>10 years) under normal operating conditions. No consumables or scheduled catalyst servicing are needed.
Can multiple LISAS ZA units be synchronized in a single lab network?
Yes. Units can be daisy-chained via Ethernet or managed centrally through the LISAS Control Suite, supporting coordinated pressure setpoints, shared alarm notifications, and consolidated usage reporting.
Is the −60 °C dew point maintained continuously under variable flow conditions?
Yes. The integrated refrigerant-based dryer and insulated air path ensure stable dew point performance across the full 0–100% flow range, verified per ISO 8573-4 Annex E test procedures.
How is regulatory compliance supported during audit preparation?
The system logs all critical parameters with ISO 8601 timestamps, supports electronic signature workflows, and exports audit-ready reports—including uptime statistics, alarm summaries, and calibration verification records—compatible with FDA and EMA inspection expectations.