ICA ICA350 Portable O₂/CO₂ Dual-Gas Analyzer
| Brand | ICA |
|---|---|
| Origin | United Kingdom |
| Model | ICA350 |
| Measurement Range | O₂: 0–25% vol, CO₂: 0–20% vol |
| Resolution | 0.1% vol |
| Repeatability | ±0.2% vol |
| Response Time (t₉₈) | ≤60 s |
| Sampling Flow Rate | 0.8 L/min |
| Power | NiMH Battery (≥8 h continuous operation), AC Adapter (100–240 V AC) |
| Dimensions | 210 × 90 × 170 mm |
Overview
The ICA ICA350 Portable O₂/CO₂ Dual-Gas Analyzer is a field-deployable, electrochemical and non-dispersive infrared (NDIR) based gas measurement system engineered for precise, real-time quantification of oxygen and carbon dioxide concentrations in confined or semi-closed environments. Designed specifically for post-harvest physiology, controlled atmosphere (CA) storage monitoring, and transport logistics validation, the instrument operates on dual-sensor principles: a high-stability galvanic electrochemical cell for O₂ detection and a temperature-compensated, miniature NDIR detector for CO₂. Unlike laboratory-grade benchtop analyzers requiring gas conditioning or external calibration gases, the ICA350 delivers direct-reading capability under ambient conditions—requiring no zero-gas or span-gas calibration prior to routine use. Its robust mechanical architecture, IP54-rated enclosure, and integrated moisture management system enable reliable deployment across agricultural supply chains, from grain silos and fruit cold stores to refrigerated shipping containers and phytosanitary quarantine chambers.
Key Features
- Dual-sensor architecture: Electrochemical O₂ sensor with factory-trimmed baseline stability and NDIR CO₂ sensor with optical path length optimized for 0–20% range—both independently temperature-compensated.
- Onboard sampling system: Integrated diaphragm pump delivering consistent 0.8 L/min flow, paired with a hydrophobic PTFE membrane filter that prevents liquid water ingress while maintaining gas permeability—critical for long-term sensor integrity in high-humidity storage environments.
- Real-time display interface: Backlit LCD panel showing simultaneous O₂ and CO₂ readings, battery status, flow confirmation, and diagnostic indicators—including pump operational feedback and sensor health alerts.
- Power resilience: Rechargeable NiMH battery pack supporting ≥8 hours of continuous operation at standard sampling frequency; universal AC adapter (100–240 V, 50/60 Hz) enables uninterrupted use during extended field surveys or facility audits.
- Field-ready ergonomics: Compact footprint (210 × 90 × 170 mm), lightweight chassis (<1.2 kg), and rubberized grip facilitate handheld operation during ladder-assisted silo inspections or mobile cold-chain verification.
Sample Compatibility & Compliance
The ICA350 is validated for use with ambient air, modified atmosphere packaging (MAP) headspace, and recirculated CA storage atmospheres containing typical agricultural volatiles (e.g., ethylene, ethanol, acetaldehyde) at non-interfering concentrations. It meets IEC 61000-6-3 (EMC emission standards) and conforms to CE marking requirements for portable instrumentation. While not certified for hazardous area classification (ATEX/IECEx), its design complies with ISO 8573-1:2010 Class 4 particulate and Class 3 moisture specifications when operated with the supplied filter. Data outputs align with GLP documentation practices—each measurement event includes timestamped values traceable to internal RTC, supporting audit readiness for USDA APHIS, EFSA, or national plant protection organization (NPPO) compliance reporting.
Software & Data Management
The analyzer operates as a standalone device without mandatory PC connectivity; however, optional RS-232 serial output (via DB9 port) supports integration with third-party data loggers or SCADA systems for automated CA room trending. Raw sensor outputs are digitally filtered using exponential moving average (EMA) algorithms to suppress transient noise without phase lag. No proprietary software is required for basic operation, but firmware updates—distributed via secure HTTPS download—are performed using terminal-emulation tools compliant with ANSI X3.64 standards. Audit trail functionality is embedded at hardware level: power-on self-test (POST) logs, sensor initialization timestamps, and battery discharge cycles are retained in non-volatile memory for up to 12 months.
Applications
- Controlled atmosphere (CA) storage monitoring for apples, pears, potatoes, and onions—verifying O₂ depletion and CO₂ accumulation thresholds per ASAE S580.3 and ISO 22037 protocols.
- Grain bin aeration management: detecting early-stage spoilage via localized CO₂ spikes (>1.5% vol) correlated with microbial respiration heat signatures.
- Phytosanitary fumigation validation: confirming post-treatment atmospheric recovery to safe O₂ levels (>19.5%) prior to human re-entry, in accordance with OSHA 1910.146 and HSE INDG384 guidelines.
- Transport container gas profiling: longitudinal tracking of O₂/CO₂ ratios during maritime or rail shipment of fresh produce to assess respiration rate consistency and detect seal integrity failures.
- Post-harvest physiology research: non-destructive assessment of crop metabolic activity under variable temperature and humidity regimes—supporting publication-grade datasets compliant with Plant Physiology journal submission standards.
FAQ
Does the ICA350 require periodic calibration with certified gas standards?
No—zero-point calibration is inherently stable due to the galvanic O₂ sensor’s self-polarizing design; CO₂ sensor drift is mitigated by factory NDIR optical alignment and thermal compensation. Annual verification against NIST-traceable reference gas (e.g., 5.0% CO₂ in N₂) is recommended for GLP-compliant applications.
Can the instrument operate continuously while connected to AC power?
Yes—the AC adapter powers the unit directly and concurrently charges the NiMH battery, enabling indefinite operation without battery depletion.
Is the hydrophobic filter replaceable, and what is its service life?
The PTFE membrane filter is user-replaceable (part no. ICA-FIL-01); under typical agricultural storage conditions (RH <90%), it remains effective for ≥6 months or 200 sampling hours.
What is the lowest detectable CO₂ concentration with stated repeatability?
At 0.5% CO₂, repeatability remains within ±0.2% vol (i.e., ±2000 ppm) across three consecutive measurements under constant flow and temperature conditions.
Does the device support data export in CSV or Excel-compatible format?
Not natively—the RS-232 output transmits ASCII-formatted strings (e.g., “O2=12.4% CO2=3.8% T=22.1C”) that can be parsed and logged by any serial-capable software (e.g., LabVIEW, Python pySerial, or generic terminal emulators).
