Agriculture & Forestry Gas Detection Solutions: Nexisense Full Series Applications

Modern agriculture and forestry are rapidly transforming toward precision and intelligence. Greenhouses control oxygen (O₂), carbon dioxide (CO₂), and ethylene (C₂H₄) to achieve off-season ripening and efficient photosynthesis. In forestry processing, wood preservation and insect-proof coatings release formaldehyde (HCHO), combustible solvent vapors, and dust mixtures. These gases are essential for production but pose risks: excessive CO₂ affects crop growth, ethylene leaks accelerate spoilage, long-term formaldehyde exposure harms workers' health, and combustible gas accumulation threatens storage safety. Traditional management cannot meet GB 3095 environmental air quality standards and GBZ 2.1 occupational exposure limits, making real-time online monitoring and flexible inspections essential.

The Nexisense SGA-500 series online gas concentration detectors use original imported sensors, further optimized with professional calibration, achieving ±5%FS accuracy, T90 response<15 seconds, full-range temperature and humidity compensation, and IP65 protection suitable for high-humidity greenhouses and dusty wood workshops. The SGA-600 portable detectors are small, single-hand operable, ready-to-measure, ideal for on-site rapid screening. SGA-700 smart modules and SGA-100 modules provide embedded solutions with standardized dimensions/pinouts/outputs (0-5V, RS485, 4-20mA, USB-to-TTL), facilitating PLC or upper computer integration. Combined with the SGA-800 alarm controller, multi-point unified power supply and linkage control are achievable. This article presents application scenarios, selection, integration, and case studies, providing practical guidance for agri-tech companies, forestry factories, and system integrators.

Agriculture & Forestry Gas Risks and Monitoring Scenarios

Core agricultural scenarios focus on greenhouses and ripening rooms. CO₂ monitoring (0-5000ppm or 0-10%VOL) regulates photosynthesis efficiency, triggering automatic ventilation if thresholds are exceeded; O₂ (0-25%VOL) prevents hypoxia or hyperoxia damage; ethylene (0-100ppm) controls ripening processes to avoid over-ripening losses. SGA-500 can be deployed diffusively or with pump suction at canopy height, supporting Modbus integration with environmental controllers for closed-loop regulation.

Forestry focuses on wood processing workshops. Formaldehyde monitoring (0-10ppm) tracks urea-formaldehyde resins and coatings, complying with GB 18580 indoor material limits; combustible gas (0-100%LEL) prevents solvent vapor explosions; dust composite monitoring prevents respiratory hazards. The SGA-600 portable device enables quick inspections of coating lines and storage areas, rapidly locating leak sources.

Guangzhou Agricultural Academy deployed SGA-500 CO₂+O₂ modules in a greenhouse connected to a PLC system, stabilizing CO₂ at 800-1200ppm, improving photosynthesis efficiency by 18% and significantly enhancing crop yield. Guangxi Fenglin Wood Workshop used SGA-600 portable formaldehyde detectors, controlling formaldehyde peaks below 0.1mg/m³ and greatly reducing occupational health risks.

Gas Detection Product Selection Guide

Selection should match gas type, sampling method, and integration requirements.

Online fixed monitoring: SGA-500 series, diffusion type for open greenhouses, pump suction type for enclosed ripening rooms or wood workshops. CO₂/ethylene use NDIR or electrochemical sensors, formaldehyde/combustible gases use PID or catalytic combustion sensors.

Portable inspection: SGA-600 series, built-in pump + diffusion mode, battery life >10 hours, ideal for multi-point screening in forestry sites.

Embedded modules: SGA-700 unified interface (RS485/4-20mA), SGA-100 supports two/three/four-wire, pipeline or pump-suction options, integrable with agri-IoT or wood drying PLCs.

Environmental considerations: anti-corrosion housings for high-humidity greenhouses; pre-filters for dusty wood workshops. Accuracy and lifetime: electrochemical 2-3 years, NDIR >5 years, quarterly zero calibration. ROI: precise control reduces losses + ensures health compliance, payback 12-18 months.

System Integration Considerations

Integration emphasizes compatibility and stability. SGA-500/SGA-100 support 4-20mA (load <500Ω) and RS485 Modbus RTU (9600bps), easily interfacing with Siemens/Omron PLCs. SGA-700 module outputs 0-5V/RS232/USB-to-TTL directly to upper computers for trend analysis.

Unified power: 24VDC (ripple <100mV), multi-point via SGA-800 controller to prevent voltage drop. Alarm relay dry contacts (30VDC/2A), dual-threshold +5%FS hysteresis, drive ventilation/humidification/exhaust. Wireless expansion via LoRa/Zigbee for large fields or forestry sites, IEC 62443 encryption.

Cabling: AWG 22 shielded <1200m, surge protection. FAT/SAT testing includes EMC and long-term stability, uptime >99%. Practices convert independent monitoring to intelligent closed-loop control, integration cycle 10-15 days.

OEM Customization and Bulk Supply Advantages

Nexisense focuses on B2B, offering flexible OEM. SGA-700 modules customizable for pinout/protocol/housing, MOQ 50 units, delivery 4 weeks. Parameter adjustments include range, output, and sampling method. Bulk >500 units enjoy tiered discounts, stable annual capacity, FOB Shenzhen, with ATEX/IECEx certificates.

Forestry companies embed formaldehyde + combustible dual-channel modules into drying kiln PLCs, enhancing equipment intelligence and market competitiveness.

Project Application Cases

Guangzhou Agricultural Academy deployed SGA-500 CO₂+O₂+ethylene system, Modbus-connected to environmental controllers, shortening crop growth cycles by 15%, improving quality consistency.

Guangxi Fenglin Wood Workshop used SGA-600 inspections + SGA-500 fixed monitoring, maintaining formaldehyde <0.08mg/m³, combustible gases zero alarm, compliant with environmental and occupational health standards.

Guangdong modern agriculture base embedded SGA-700 modules into IoT platform, real-time cloud analysis, irrigation/ventilation linkage, saving 20% water and increasing yield by 12%.

These cases demonstrate efficient, reliable integration, validating Nexisense applicability in agriculture and forestry.

Frequently Asked Questions

1. Which gases are mainly monitored in agriculture & forestry?
Agriculture: CO₂ (0-5000ppm/0-10%VOL) for photosynthesis control, O₂ (0-25%VOL) to prevent hypoxia/hyperoxia, ethylene (0-100ppm) for precise ripening control. Forestry: formaldehyde (0-10ppm), combustible gases (0-100%LEL), VOCs (PID 0-2000ppm). Single or composite channels configurable with cross-interference assessment reports.

2. Diffusion vs. pump suction in greenhouses?
Diffusion for open greenhouses, simple, low cost, real-time response; pump suction for enclosed ripening rooms, multi-layer racks, or high-humidity areas, avoiding blind spots. CFD simulations recommend optimal points & pipe lengths (<10m). Pump suction response <10s.

3. Forestry formaldehyde monitoring in high-humidity/dusty environments?
SGA-500 uses advanced temp/humidity compensation (0-95%RH, -10°C to +40°C, drift <±2%FS/yr), 316L stainless steel + PTFE filter probe. Quarterly calibration recommended. Electrochemical sensors 2-3 years, NDIR >5 years, health index <80% triggers Modbus alert for predictive replacement.

4. SGA-700/SGA-100 module outputs and PLC integration?
SGA-700: 0-5V, RS485 Modbus RTU, RS232, 4-20mA, USB-TTL. SGA-100: 2/3/4-wire 4-20mA. Use AWG22 shielded cable, <1200m, terminate properly. Nexisense provides Modbus register map and batch parameter tools; integration cycle ~1 week.

5. SGA-600 portable efficient use?
Lightweight (<300g), pump+diffusion, battery >10h, data storage, USB export, real-time display, alarms. Forestry: multi-point inspections, agriculture: peak detection. Daily zero calibration recommended.

6. IoT or MES integration for remote monitoring?
RS485 Modbus RTU or 4-20mA to PLC/gateway; upper computers via Modbus TCP or OPC UA to cloud. Nexisense API allows remote threshold adjustments, alarm push, trend analysis; linkage with ventilation/irrigation/spraying. Isolated RS-485 recommended for long lines.

7. Certifications, lead time, logistics?
ATEX/IECEx/CNEx, CE/RoHS, calibration reports. MOQ flexible (SGA-700: 50 units), 4-8 weeks depending on customization, bulk >500 tiered discounts. FOB Shenzhen, supports EXW/DDP, shipping documents provided.

8. Maintenance cycle and predictive maintenance?
Monthly zero/scale calibration first month, quarterly afterward. Electrochemical 2-3 years, NDIR >5 years. Health index <80% triggers predictive replacement, reducing unplanned maintenance by ~40%.

Summary

Nexisense full series offers precise, stable, flexible integration, providing complete gas monitoring solutions from fixed online, portable inspections, to embedded modules. In greenhouses and wood processing, it improves yield and quality, reduces safety hazards, and ensures environmental and occupational standards. Future IoT integration will enable smarter, predictive monitoring. Agri-tech companies, forestry factories, and system integrators can contact Nexisense to share layouts or gas lists for POC solutions and integration support.